/********************************************************************** * tospace.cpp * * Compute fuzzy word spacing thresholds for each row. * I.e. set : max_nonspace * space_threshold * min_space * kern_size * space_size * for each row. * ONLY FOR PROPORTIONAL BLOCKS - FIXED PITCH IS ASSUMED ALREADY DONE * * Note: functions in this file were originally not members of any * class or enclosed by any namespace. Now they are all static members * of the Textord class. * **********************************************************************/ #include "textord.h" #include "mfcpch.h" #include "tovars.h" #include "drawtord.h" #include "textord.h" #include "ndminx.h" #include "statistc.h" // Include automatically generated configuration file if running autoconf. #ifdef HAVE_CONFIG_H #include "config_auto.h" #endif #define MAXSPACING 128 /*max expected spacing in pix */ namespace tesseract { void Textord::to_spacing( ICOORD page_tr, //topright of page TO_BLOCK_LIST *blocks //blocks on page ) { TO_BLOCK_IT block_it; //iterator TO_BLOCK *block; //current block; TO_ROW_IT row_it; //row iterator TO_ROW *row; //current row int block_index; //block number int row_index; //row number //estimated width of real spaces for whole block inT16 block_space_gap_width; //estimated width of non space gaps for whole block inT16 block_non_space_gap_width; BOOL8 old_text_ord_proportional;//old fixed/prop result GAPMAP *gapmap = NULL; //map of big vert gaps in blk block_it.set_to_list (blocks); block_index = 1; for (block_it.mark_cycle_pt (); !block_it.cycled_list (); block_it.forward ()) { block = block_it.data (); gapmap = new GAPMAP (block); block_spacing_stats(block, gapmap, old_text_ord_proportional, block_space_gap_width, block_non_space_gap_width); // Make sure relative values of block-level space and non-space gap // widths are reasonable. The ratio of 1:3 is also used in // block_spacing_stats, to corrrect the block_space_gap_width // Useful for arabic and hindi, when the non-space gap width is // often over-estimated and should not be trusted. A similar ratio // is found in block_spacing_stats. if (tosp_old_to_method && tosp_old_to_constrain_sp_kn && (float) block_space_gap_width / block_non_space_gap_width < 3.0) { block_non_space_gap_width = (inT16) floor (block_space_gap_width / 3.0); } row_it.set_to_list (block->get_rows ()); row_index = 1; for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) { row = row_it.data (); if ((row->pitch_decision == PITCH_DEF_PROP) || (row->pitch_decision == PITCH_CORR_PROP)) { if ((tosp_debug_level > 0) && !old_text_ord_proportional) tprintf ("Block %d Row %d: Now Proportional\n", block_index, row_index); row_spacing_stats(row, gapmap, block_index, row_index, block_space_gap_width, block_non_space_gap_width); } else { if ((tosp_debug_level > 0) && old_text_ord_proportional) tprintf ("Block %d Row %d: Now Fixed Pitch Decision:%d fp flag:%f\n", block_index, row_index, row->pitch_decision, row->fixed_pitch); } #ifndef GRAPHICS_DISABLED if (textord_show_initial_words) plot_word_decisions (to_win, (inT16) row->fixed_pitch, row); #endif row_index++; } delete gapmap; block_index++; } } /************************************************************************* * block_spacing_stats() *************************************************************************/ void Textord::block_spacing_stats( TO_BLOCK *block, GAPMAP *gapmap, BOOL8 &old_text_ord_proportional, inT16 &block_space_gap_width, //resulting estimate inT16 &block_non_space_gap_width //resulting estimate ) { TO_ROW_IT row_it; //row iterator TO_ROW *row; //current row BLOBNBOX_IT blob_it; //iterator STATS centre_to_centre_stats (0, MAXSPACING); //DEBUG USE ONLY STATS all_gap_stats (0, MAXSPACING); STATS space_gap_stats (0, MAXSPACING); inT16 minwidth = MAX_INT16; //narrowest blob TBOX blob_box; TBOX prev_blob_box; inT16 centre_to_centre; inT16 gap_width; float real_space_threshold; float iqr_centre_to_centre; //DEBUG USE ONLY float iqr_all_gap_stats; //DEBUG USE ONLY inT32 end_of_row; inT32 row_length; row_it.set_to_list (block->get_rows ()); for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) { row = row_it.data (); if (!row->blob_list ()->empty () && (!tosp_only_use_prop_rows || (row->pitch_decision == PITCH_DEF_PROP) || (row->pitch_decision == PITCH_CORR_PROP))) { blob_it.set_to_list (row->blob_list ()); blob_it.mark_cycle_pt (); end_of_row = blob_it.data_relative (-1)->bounding_box ().right (); if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); row_length = end_of_row - blob_box.left (); if (blob_box.width () < minwidth) minwidth = blob_box.width (); prev_blob_box = blob_box; while (!blob_it.cycled_list ()) { if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); if (blob_box.width () < minwidth) minwidth = blob_box.width (); gap_width = blob_box.left () - prev_blob_box.right (); if (!ignore_big_gap (row, row_length, gapmap, prev_blob_box.right (), blob_box.left ())) { all_gap_stats.add (gap_width, 1); centre_to_centre = (blob_box.left () + blob_box.right () - (prev_blob_box.left () + prev_blob_box.right ())) / 2; //DEBUG centre_to_centre_stats.add (centre_to_centre, 1); // DEBUG } prev_blob_box = blob_box; } } } //Inadequate samples if (all_gap_stats.get_total () <= 1) { block_non_space_gap_width = minwidth; block_space_gap_width = -1; //No est. space width //DEBUG old_text_ord_proportional = TRUE; } else { /* For debug only ..... */ iqr_centre_to_centre = centre_to_centre_stats.ile (0.75) - centre_to_centre_stats.ile (0.25); iqr_all_gap_stats = all_gap_stats.ile (0.75) - all_gap_stats.ile (0.25); old_text_ord_proportional = iqr_centre_to_centre * 2 > iqr_all_gap_stats; /* .......For debug only */ /* The median of the gaps is used as an estimate of the NON-SPACE gap width. This RELIES on the assumption that there are more gaps WITHIN words than BETWEEN words in a block Now try to estimate the width of a real space for all real spaces in the block. Do this by using a crude threshold to ignore "narrow" gaps, then find the median of the "wide" gaps and use this. */ block_non_space_gap_width = (inT16) floor (all_gap_stats.median ()); // median gap row_it.set_to_list (block->get_rows ()); for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) { row = row_it.data (); if (!row->blob_list ()->empty () && (!tosp_only_use_prop_rows || (row->pitch_decision == PITCH_DEF_PROP) || (row->pitch_decision == PITCH_CORR_PROP))) { real_space_threshold = MAX (tosp_init_guess_kn_mult * block_non_space_gap_width, tosp_init_guess_xht_mult * row->xheight); blob_it.set_to_list (row->blob_list ()); blob_it.mark_cycle_pt (); end_of_row = blob_it.data_relative (-1)->bounding_box ().right (); if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); row_length = blob_box.left () - end_of_row; prev_blob_box = blob_box; while (!blob_it.cycled_list ()) { if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); gap_width = blob_box.left () - prev_blob_box.right (); if ((gap_width > real_space_threshold) && !ignore_big_gap (row, row_length, gapmap, prev_blob_box.right (), blob_box.left ())) { /* If tosp_use_cert_spaces is enabled, the estimate of the space gap is restricted to obvious spaces - those wider than half the xht or those with wide blobs on both sides - i.e not things that are suspect 1's or punctuation that is sometimes widely spaced. */ if (!tosp_block_use_cert_spaces || (gap_width > tosp_fuzzy_space_factor2 * row->xheight) || ((gap_width > tosp_fuzzy_space_factor1 * row->xheight) && (!tosp_narrow_blobs_not_cert || (!narrow_blob (row, prev_blob_box) && !narrow_blob (row, blob_box)))) || (wide_blob (row, prev_blob_box) && wide_blob (row, blob_box))) space_gap_stats.add (gap_width, 1); } prev_blob_box = blob_box; } } } //Inadequate samples if (space_gap_stats.get_total () <= 2) block_space_gap_width = -1;//No est. space width else block_space_gap_width = MAX ((inT16) floor (space_gap_stats.median ()), 3 * block_non_space_gap_width); } } /************************************************************************* * row_spacing_stats() * Set values for min_space, max_non_space based on row stats only * If failure - return 0 values. *************************************************************************/ void Textord::row_spacing_stats( TO_ROW *row, GAPMAP *gapmap, inT16 block_idx, inT16 row_idx, inT16 block_space_gap_width, //estimate for block inT16 block_non_space_gap_width //estimate for block ) { //iterator BLOBNBOX_IT blob_it = row->blob_list (); STATS all_gap_stats (0, MAXSPACING); STATS cert_space_gap_stats (0, MAXSPACING); STATS all_space_gap_stats (0, MAXSPACING); STATS small_gap_stats (0, MAXSPACING); TBOX blob_box; TBOX prev_blob_box; inT16 gap_width; inT16 real_space_threshold = 0; inT16 max = 0; inT16 index; inT16 large_gap_count = 0; BOOL8 suspected_table; inT32 max_max_nonspace; //upper bound BOOL8 good_block_space_estimate = block_space_gap_width > 0; inT32 end_of_row; inT32 row_length = 0; float sane_space; inT32 sane_threshold; /* Collect first pass stats for row */ if (!good_block_space_estimate) block_space_gap_width = inT16 (floor (row->xheight / 2)); if (!row->blob_list ()->empty ()) { if (tosp_threshold_bias1 > 0) real_space_threshold = block_non_space_gap_width + inT16 (floor (0.5 + tosp_threshold_bias1 * (block_space_gap_width - block_non_space_gap_width))); else real_space_threshold = //Old TO method (block_space_gap_width + block_non_space_gap_width) / 2; blob_it.set_to_list (row->blob_list ()); blob_it.mark_cycle_pt (); end_of_row = blob_it.data_relative (-1)->bounding_box ().right (); if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); row_length = end_of_row - blob_box.left (); prev_blob_box = blob_box; while (!blob_it.cycled_list ()) { if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); gap_width = blob_box.left () - prev_blob_box.right (); if (ignore_big_gap (row, row_length, gapmap, prev_blob_box.right (), blob_box.left ())) large_gap_count++; else { if (gap_width >= real_space_threshold) { if (!tosp_row_use_cert_spaces || (gap_width > tosp_fuzzy_space_factor2 * row->xheight) || ((gap_width > tosp_fuzzy_space_factor1 * row->xheight) && (!tosp_narrow_blobs_not_cert || (!narrow_blob (row, prev_blob_box) && !narrow_blob (row, blob_box)))) || (wide_blob (row, prev_blob_box) && wide_blob (row, blob_box))) cert_space_gap_stats.add (gap_width, 1); all_space_gap_stats.add (gap_width, 1); } else small_gap_stats.add (gap_width, 1); all_gap_stats.add (gap_width, 1); } prev_blob_box = blob_box; } } suspected_table = (large_gap_count > 1) || ((large_gap_count > 0) && (all_gap_stats.get_total () <= tosp_few_samples)); /* Now determine row kern size, space size and threshold */ if ((cert_space_gap_stats.get_total () >= tosp_enough_space_samples_for_median) || ((suspected_table || all_gap_stats.get_total () <= tosp_short_row) && cert_space_gap_stats.get_total () > 0)) { old_to_method(row, &all_gap_stats, &cert_space_gap_stats, &small_gap_stats, block_space_gap_width, block_non_space_gap_width); } else { if (!tosp_recovery_isolated_row_stats || !isolated_row_stats (row, gapmap, &all_gap_stats, suspected_table, block_idx, row_idx)) { if (tosp_row_use_cert_spaces && (tosp_debug_level > 5)) tprintf ("B:%d R:%d -- Inadequate certain spaces.\n", block_idx, row_idx); if (tosp_row_use_cert_spaces1 && good_block_space_estimate) { //Use block default row->space_size = block_space_gap_width; if (all_gap_stats.get_total () > tosp_redo_kern_limit) row->kern_size = all_gap_stats.median (); else row->kern_size = block_non_space_gap_width; row->space_threshold = inT32 (floor ((row->space_size + row->kern_size) / tosp_old_sp_kn_th_factor)); } else old_to_method(row, &all_gap_stats, &all_space_gap_stats, &small_gap_stats, block_space_gap_width, block_non_space_gap_width); } } if (tosp_improve_thresh && !suspected_table) improve_row_threshold(row, &all_gap_stats); /* Now lets try to be careful not to do anything silly with tables when we are ignoring big gaps*/ if (tosp_sanity_method == 0) { if (suspected_table && (row->space_size < tosp_table_kn_sp_ratio * row->kern_size)) { if (tosp_debug_level > 5) tprintf ("B:%d R:%d -- DONT BELIEVE SPACE %3.2f %d %3.2f.\n", block_idx, row_idx, row->kern_size, row->space_threshold, row->space_size); row->space_threshold = (inT32) (tosp_table_kn_sp_ratio * row->kern_size); row->space_size = MAX (row->space_threshold + 1, row->xheight); } } else if (tosp_sanity_method == 1) { sane_space = row->space_size; /* NEVER let space size get too close to kern size */ if ((row->space_size < tosp_min_sane_kn_sp * MAX (row->kern_size, 2.5)) || ((row->space_size - row->kern_size) < (tosp_silly_kn_sp_gap * row->xheight))) { if (good_block_space_estimate && (block_space_gap_width >= tosp_min_sane_kn_sp * row->kern_size)) sane_space = block_space_gap_width; else sane_space = MAX (tosp_min_sane_kn_sp * MAX (row->kern_size, 2.5), row->xheight / 2); if (tosp_debug_level > 5) tprintf ("B:%d R:%d -- DONT BELIEVE SPACE %3.2f %d %3.2f -> %3.2f.\n", block_idx, row_idx, row->kern_size, row->space_threshold, row->space_size, sane_space); row->space_size = sane_space; row->space_threshold = inT32 (floor ((row->space_size + row->kern_size) / tosp_old_sp_kn_th_factor)); } /* NEVER let threshold get VERY far away from kern */ sane_threshold = inT32 (floor (tosp_max_sane_kn_thresh * MAX (row->kern_size, 2.5))); if (row->space_threshold > sane_threshold) { if (tosp_debug_level > 5) tprintf ("B:%d R:%d -- DONT BELIEVE THRESH %3.2f %d %3.2f->%d.\n", block_idx, row_idx, row->kern_size, row->space_threshold, row->space_size, sane_threshold); row->space_threshold = sane_threshold; if (row->space_size <= sane_threshold) row->space_size = row->space_threshold + 1.0f; } /* Beware of tables - there may be NO spaces */ if (suspected_table) { sane_space = MAX (tosp_table_kn_sp_ratio * row->kern_size, tosp_table_xht_sp_ratio * row->xheight); sane_threshold = inT32 (floor ((sane_space + row->kern_size) / 2)); if ((row->space_size < sane_space) || (row->space_threshold < sane_threshold)) { if (tosp_debug_level > 5) tprintf ("B:%d R:%d -- SUSPECT NO SPACES %3.2f %d %3.2f.\n", block_idx, row_idx, row->kern_size, row->space_threshold, row->space_size); //the minimum sane value row->space_threshold = (inT32) sane_space; row->space_size = MAX (row->space_threshold + 1, row->xheight); } } } /* Now lets try to put some error limits on the threshold */ if (tosp_old_to_method) { /* Old textord made a space if gap >= threshold */ //NO FUZZY SPACES YET row->max_nonspace = row->space_threshold; //NO FUZZY SPACES YET row->min_space = row->space_threshold + 1; } else { /* Any gap greater than 0.6 x-ht is bound to be a space (isn't it:-) */ row->min_space = MIN (inT32 (ceil (tosp_fuzzy_space_factor * row->xheight)), inT32 (row->space_size)); if (row->min_space <= row->space_threshold) //Dont be silly row->min_space = row->space_threshold + 1; /* Lets try to guess the max certain kern gap by looking at the cluster of kerns for the row. The row is proportional so the kerns should cluster tightly at the bottom of the distribution. We also expect most gaps to be kerns. Find the maximum of the kern piles between 0 and twice the kern estimate. Piles before the first one with less than 1/10 the maximum number of samples can be taken as certain kerns. Of course, there are some cases where the kern peak and space peaks merge, so we will put an UPPER limit on the max certain kern gap of some fraction below the threshold. */ max_max_nonspace = inT32 ((row->space_threshold + row->kern_size) / 2); //default row->max_nonspace = max_max_nonspace; for (index = 0; index <= max_max_nonspace; index++) { if (all_gap_stats.pile_count (index) > max) max = all_gap_stats.pile_count (index); if ((index > row->kern_size) && (all_gap_stats.pile_count (index) < 0.1 * max)) { row->max_nonspace = index; break; } } } /* Yet another algorithm - simpler this time - just choose a fraction of the threshold to space range */ if ((tosp_fuzzy_sp_fraction > 0) && (row->space_size > row->space_threshold)) row->min_space = MAX (row->min_space, (inT32) ceil (row->space_threshold + tosp_fuzzy_sp_fraction * (row->space_size - row->space_threshold))); /* Ensure that ANY space less than some multiplier times the kern size is fuzzy. In tables there is a risk of erroneously setting a small space size when there are no real spaces. Sometimes tables have text squashed into columns so that the kn->sp ratio is small anyway - this means that we cant use this to force a wider separation - hence we rely on context to join any dubious breaks. */ if ((tosp_table_fuzzy_kn_sp_ratio > 0) && (suspected_table || tosp_fuzzy_limit_all)) row->min_space = MAX (row->min_space, (inT32) ceil (tosp_table_fuzzy_kn_sp_ratio * row->kern_size)); if ((tosp_fuzzy_kn_fraction > 0) && (row->kern_size < row->space_threshold)) { row->max_nonspace = (inT32) floor (0.5 + row->kern_size + tosp_fuzzy_kn_fraction * (row->space_threshold - row->kern_size)); } if (row->max_nonspace > row->space_threshold) { //Dont be silly row->max_nonspace = row->space_threshold; } if (tosp_debug_level > 5) tprintf ("B:%d R:%d L:%d-- Kn:%d Sp:%d Thr:%d -- Kn:%3.2f (%d) Thr:%d (%d) Sp:%3.2f\n", block_idx, row_idx, row_length, block_non_space_gap_width, block_space_gap_width, real_space_threshold, row->kern_size, row->max_nonspace, row->space_threshold, row->min_space, row->space_size); if (tosp_debug_level > 10) tprintf("row->kern_size = %3.2f, row->space_size = %3.2f, " "row->space_threshold = %d\n", row->kern_size, row->space_size, row->space_threshold); } void Textord::old_to_method( TO_ROW *row, STATS *all_gap_stats, STATS *space_gap_stats, STATS *small_gap_stats, inT16 block_space_gap_width, //estimate for block inT16 block_non_space_gap_width //estimate for block ) { /* First, estimate row space size */ /* Old to condition was > 2 */ if (space_gap_stats->get_total () >= tosp_enough_space_samples_for_median) { //Adequate samples /* Set space size to median of spaces BUT limits it if it seems wildly out */ row->space_size = space_gap_stats->median (); if (row->space_size > block_space_gap_width * 1.5) { if (tosp_old_to_bug_fix) row->space_size = block_space_gap_width * 1.5; else //BUG??? should be *1.5 row->space_size = block_space_gap_width; } if (row->space_size < (block_non_space_gap_width * 2) + 1) row->space_size = (block_non_space_gap_width * 2) + 1; } //Only 1 or 2 samples else if (space_gap_stats->get_total () >= 1) { //hence mean not median row->space_size = space_gap_stats->mean (); if (row->space_size > block_space_gap_width * 1.5) { if (tosp_old_to_bug_fix) row->space_size = block_space_gap_width * 1.5; else //BUG??? should be *1.5 row->space_size = block_space_gap_width; } if (row->space_size < (block_non_space_gap_width * 3) + 1) row->space_size = (block_non_space_gap_width * 3) + 1; } else { //Use block default row->space_size = block_space_gap_width; } /* Next, estimate row kern size */ if ((tosp_only_small_gaps_for_kern) && (small_gap_stats->get_total () > tosp_redo_kern_limit)) row->kern_size = small_gap_stats->median (); else if (all_gap_stats->get_total () > tosp_redo_kern_limit) row->kern_size = all_gap_stats->median (); else //old TO -SAME FOR ALL ROWS row->kern_size = block_non_space_gap_width; /* Finally, estimate row space threshold */ if (tosp_threshold_bias2 > 0) { row->space_threshold = inT32 (floor (0.5 + row->kern_size + tosp_threshold_bias2 * (row->space_size - row->kern_size))); } else { /* NOTE old text ord uses (space_size + kern_size + 1)/2 as the threshold and holds this in a float. The use is with a >= test NEW textord uses an integer threshold and a > test It comes to the same thing. (Though there is a difference in that old textor has integer space_size and kern_size.) */ row->space_threshold = inT32 (floor ((row->space_size + row->kern_size) / 2)); } // Apply the same logic and ratios as in row_spacing_stats to // restrict relative values of the row's space_size, kern_size, and // space_threshold if (tosp_old_to_constrain_sp_kn && tosp_sanity_method == 1 && ((row->space_size < tosp_min_sane_kn_sp * MAX (row->kern_size, 2.5)) || ((row->space_size - row->kern_size) < tosp_silly_kn_sp_gap * row->xheight))) { if (row->kern_size > 2.5) row->kern_size = row->space_size / tosp_min_sane_kn_sp; row->space_threshold = inT32 (floor ((row->space_size + row->kern_size) / tosp_old_sp_kn_th_factor)); } } /************************************************************************* * isolated_row_stats() * Set values for min_space, max_non_space based on row stats only *************************************************************************/ BOOL8 Textord::isolated_row_stats(TO_ROW *row, GAPMAP *gapmap, STATS *all_gap_stats, BOOL8 suspected_table, inT16 block_idx, inT16 row_idx) { float kern_estimate; float crude_threshold_estimate; inT16 small_gaps_count; inT16 total; //iterator BLOBNBOX_IT blob_it = row->blob_list (); STATS cert_space_gap_stats (0, MAXSPACING); STATS all_space_gap_stats (0, MAXSPACING); STATS small_gap_stats (0, MAXSPACING); TBOX blob_box; TBOX prev_blob_box; inT16 gap_width; inT32 end_of_row; inT32 row_length; kern_estimate = all_gap_stats->median (); crude_threshold_estimate = MAX (tosp_init_guess_kn_mult * kern_estimate, tosp_init_guess_xht_mult * row->xheight); small_gaps_count = stats_count_under (all_gap_stats, (inT16) ceil (crude_threshold_estimate)); total = all_gap_stats->get_total (); if ((total <= tosp_redo_kern_limit) || ((small_gaps_count / (float) total) < tosp_enough_small_gaps) || (total - small_gaps_count < 1)) { if (tosp_debug_level > 5) tprintf ("B:%d R:%d -- Cant do isolated row stats.\n", block_idx, row_idx); return FALSE; } blob_it.set_to_list (row->blob_list ()); blob_it.mark_cycle_pt (); end_of_row = blob_it.data_relative (-1)->bounding_box ().right (); if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); row_length = end_of_row - blob_box.left (); prev_blob_box = blob_box; while (!blob_it.cycled_list ()) { if (tosp_use_pre_chopping) blob_box = box_next_pre_chopped (&blob_it); else if (tosp_stats_use_xht_gaps) blob_box = reduced_box_next (row, &blob_it); else blob_box = box_next (&blob_it); gap_width = blob_box.left () - prev_blob_box.right (); if (!ignore_big_gap (row, row_length, gapmap, prev_blob_box.right (), blob_box.left ()) && (gap_width > crude_threshold_estimate)) { if ((gap_width > tosp_fuzzy_space_factor2 * row->xheight) || ((gap_width > tosp_fuzzy_space_factor1 * row->xheight) && (!tosp_narrow_blobs_not_cert || (!narrow_blob (row, prev_blob_box) && !narrow_blob (row, blob_box)))) || (wide_blob (row, prev_blob_box) && wide_blob (row, blob_box))) cert_space_gap_stats.add (gap_width, 1); all_space_gap_stats.add (gap_width, 1); } if (gap_width < crude_threshold_estimate) small_gap_stats.add (gap_width, 1); prev_blob_box = blob_box; } if (cert_space_gap_stats.get_total () >= tosp_enough_space_samples_for_median) //median row->space_size = cert_space_gap_stats.median (); else if (suspected_table && (cert_space_gap_stats.get_total () > 0)) //to avoid spaced row->space_size = cert_space_gap_stats.mean (); // 1's in tables else if (all_space_gap_stats.get_total () >= tosp_enough_space_samples_for_median) //median row->space_size = all_space_gap_stats.median (); else row->space_size = all_space_gap_stats.mean (); if (tosp_only_small_gaps_for_kern) row->kern_size = small_gap_stats.median (); else row->kern_size = all_gap_stats->median (); row->space_threshold = inT32 (floor ((row->space_size + row->kern_size) / 2)); /* Sanity check */ if ((row->kern_size >= row->space_threshold) || (row->space_threshold >= row->space_size) || (row->space_threshold <= 0)) { if (tosp_debug_level > 5) tprintf ("B:%d R:%d -- Isolated row stats SANITY FAILURE: %f %d %f\n", block_idx, row_idx, row->kern_size, row->space_threshold, row->space_size); row->kern_size = 0.0f; row->space_threshold = 0; row->space_size = 0.0f; return FALSE; } if (tosp_debug_level > 5) tprintf ("B:%d R:%d -- Isolated row stats: %f %d %f\n", block_idx, row_idx, row->kern_size, row->space_threshold, row->space_size); return TRUE; } inT16 Textord::stats_count_under(STATS *stats, inT16 threshold) { inT16 index; inT16 total = 0; for (index = 0; index < threshold; index++) total += stats->pile_count (index); return total; } /************************************************************************* * improve_row_threshold() * Try to recognise a "normal line" - * > 25 gaps * && space > 3 * kn && space > 10 * (I.e. reasonably large space and kn:sp ratio) * && > 3/4 # gaps < kn + (sp - kn)/3 * (I.e. most gaps are well away from space estimate) * && a gap of max( 3, (sp - kn)/3 ) empty histogram positions is found * somewhere in the histogram between kn and sp * THEN set the threshold and fuzzy limits to this gap - ie NO fuzzies * NO!!!!! the bristol line has "11" with a gap of 12 between the 1's!!! * try moving the default threshold to within this band but leave the * fuzzy limit calculation as at present. *************************************************************************/ void Textord::improve_row_threshold(TO_ROW *row, STATS *all_gap_stats) { float sp = row->space_size; float kn = row->kern_size; inT16 reqd_zero_width = 0; inT16 zero_width = 0; inT16 zero_start = 0; inT16 index = 0; if (tosp_debug_level > 10) tprintf ("Improve row threshold 0"); if ((all_gap_stats->get_total () <= 25) || (sp <= 10) || (sp <= 3 * kn) || (stats_count_under (all_gap_stats, (inT16) ceil (kn + (sp - kn) / 3 + 0.5)) < (0.75 * all_gap_stats->get_total ()))) return; if (tosp_debug_level > 10) tprintf (" 1"); /* Look for the first region of all 0's in the histogram which is wider than max( 3, (sp - kn)/3 ) and starts between kn and sp. If found, and current threshold is not within it, move the threshold so that is is just inside it. */ reqd_zero_width = (inT16) floor ((sp - kn) / 3 + 0.5); if (reqd_zero_width < 3) reqd_zero_width = 3; for (index = inT16 (ceil (kn)); index < inT16 (floor (sp)); index++) { if (all_gap_stats->pile_count (index) == 0) { if (zero_width == 0) zero_start = index; zero_width++; } else { if (zero_width >= reqd_zero_width) break; else { zero_width = 0; } } } index--; if (tosp_debug_level > 10) tprintf (" reqd_z_width: %d found %d 0's, starting %d; thresh: %d/n", reqd_zero_width, zero_width, zero_start, row->space_threshold); if ((zero_width < reqd_zero_width) || ((row->space_threshold >= zero_start) && (row->space_threshold <= index))) return; if (tosp_debug_level > 10) tprintf (" 2"); if (row->space_threshold < zero_start) { if (tosp_debug_level > 5) tprintf ("Improve row kn:%5.2f sp:%5.2f 0's: %d -> %d thresh:%d -> %d\n", kn, sp, zero_start, index, row->space_threshold, zero_start); row->space_threshold = zero_start; } if (row->space_threshold > index) { if (tosp_debug_level > 5) tprintf ("Improve row kn:%5.2f sp:%5.2f 0's: %d -> %d thresh:%d -> %d\n", kn, sp, zero_start, index, row->space_threshold, index); row->space_threshold = index; } } /********************************************************************** * make_prop_words * * Convert a TO_BLOCK to a BLOCK. **********************************************************************/ ROW *Textord::make_prop_words( TO_ROW *row, // row to make FCOORD rotation // for drawing ) { BOOL8 bol; //start of line /* prev_ values are for start of word being built. non prev_ values are for the gap between the word being built and the next one. */ BOOL8 prev_fuzzy_sp; //probably space BOOL8 prev_fuzzy_non; //probably not uinT8 prev_blanks; //in front of word BOOL8 fuzzy_sp; //probably space BOOL8 fuzzy_non; //probably not uinT8 blanks; //in front of word BOOL8 prev_gap_was_a_space = FALSE; BOOL8 break_at_next_gap = FALSE; ROW *real_row; //output row C_OUTLINE_IT cout_it; C_BLOB_LIST cblobs; C_BLOB_IT cblob_it = &cblobs; WERD_LIST words; WERD_IT word_it; //new words WERD *word; //new word WERD_IT rep_char_it; //repeated char words inT32 next_rep_char_word_right = MAX_INT32; float repetition_spacing; //gap between repetitions inT32 xstarts[2]; //row ends double coeffs[3]; //quadratic inT32 prev_x; //end of prev blob BLOBNBOX *bblob; //current blob TBOX blob_box; //bounding box BLOBNBOX_IT box_it; //iterator TBOX prev_blob_box; TBOX next_blob_box; inT16 prev_gap = MAX_INT16; inT16 current_gap = MAX_INT16; inT16 next_gap = MAX_INT16; inT16 prev_within_xht_gap = MAX_INT16; inT16 current_within_xht_gap = MAX_INT16; inT16 next_within_xht_gap = MAX_INT16; inT16 word_count = 0; rep_char_it.set_to_list (&(row->rep_words)); if (!rep_char_it.empty ()) { next_rep_char_word_right = rep_char_it.data ()->bounding_box ().right (); } prev_x = -MAX_INT16; cblob_it.set_to_list (&cblobs); box_it.set_to_list (row->blob_list ()); word_it.set_to_list (&words); bol = TRUE; prev_blanks = 0; prev_fuzzy_sp = FALSE; prev_fuzzy_non = FALSE; if (!box_it.empty ()) { xstarts[0] = box_it.data ()->bounding_box ().left (); if (xstarts[0] > next_rep_char_word_right) { /* We need to insert a repeated char word at the start of the row */ word = rep_char_it.extract (); word_it.add_after_then_move (word); /* Set spaces before repeated char word */ word->set_flag (W_BOL, TRUE); bol = FALSE; word->set_blanks (0); //NO uncertainty word->set_flag (W_FUZZY_SP, FALSE); word->set_flag (W_FUZZY_NON, FALSE); xstarts[0] = word->bounding_box ().left (); /* Set spaces after repeated char word (and leave current word set) */ repetition_spacing = find_mean_blob_spacing (word); current_gap = box_it.data ()->bounding_box ().left () - next_rep_char_word_right; current_within_xht_gap = current_gap; if (current_gap > tosp_rep_space * repetition_spacing) { prev_blanks = (uinT8) floor (current_gap / row->space_size); if (prev_blanks < 1) prev_blanks = 1; } else prev_blanks = 0; if (tosp_debug_level > 5) tprintf ("Repch wd at BOL(%d, %d). rep spacing %5.2f; Rgap:%d ", box_it.data ()->bounding_box ().left (), box_it.data ()->bounding_box ().bottom (), repetition_spacing, current_gap); prev_fuzzy_sp = FALSE; prev_fuzzy_non = FALSE; if (rep_char_it.empty ()) { next_rep_char_word_right = MAX_INT32; } else { rep_char_it.forward (); next_rep_char_word_right = rep_char_it.data ()->bounding_box ().right (); } } peek_at_next_gap(row, box_it, next_blob_box, next_gap, next_within_xht_gap); do { bblob = box_it.data (); blob_box = bblob->bounding_box (); if (bblob->joined_to_prev ()) { if (bblob->cblob () != NULL) { cout_it.set_to_list (cblob_it.data ()->out_list ()); cout_it.move_to_last (); cout_it.add_list_after (bblob->cblob ()->out_list ()); delete bblob->cblob (); } } else { if (bblob->cblob() != NULL) cblob_it.add_after_then_move (bblob->cblob ()); prev_x = blob_box.right (); } box_it.forward (); //next one bblob = box_it.data (); blob_box = bblob->bounding_box (); if (!bblob->joined_to_prev() && bblob->cblob() != NULL) { /* Real Blob - not multiple outlines or pre-chopped */ prev_gap = current_gap; prev_within_xht_gap = current_within_xht_gap; prev_blob_box = next_blob_box; current_gap = next_gap; current_within_xht_gap = next_within_xht_gap; peek_at_next_gap(row, box_it, next_blob_box, next_gap, next_within_xht_gap); inT16 prev_gap_arg = prev_gap; inT16 next_gap_arg = next_gap; if (tosp_only_use_xht_gaps) { prev_gap_arg = prev_within_xht_gap; next_gap_arg = next_within_xht_gap; } // Decide if a word-break should be inserted if (blob_box.left () > next_rep_char_word_right || make_a_word_break(row, blob_box, prev_gap_arg, prev_blob_box, current_gap, current_within_xht_gap, next_blob_box, next_gap_arg, blanks, fuzzy_sp, fuzzy_non, prev_gap_was_a_space, break_at_next_gap) || box_it.at_first()) { /* Form a new word out of the blobs collected */ word = new WERD (&cblobs, prev_blanks, NULL); word_count++; word_it.add_after_then_move (word); if (bol) { word->set_flag (W_BOL, TRUE); bol = FALSE; } if (prev_fuzzy_sp) //probably space word->set_flag (W_FUZZY_SP, TRUE); else if (prev_fuzzy_non) word->set_flag (W_FUZZY_NON, TRUE); //probably not if (blob_box.left () > next_rep_char_word_right) { /* We need to insert a repeated char word */ word = rep_char_it.extract (); word_it.add_after_then_move (word); /* Set spaces before repeated char word */ repetition_spacing = find_mean_blob_spacing (word); current_gap = word->bounding_box ().left () - prev_x; current_within_xht_gap = current_gap; if (current_gap > tosp_rep_space * repetition_spacing) { blanks = (uinT8) floor (current_gap / row->space_size); if (blanks < 1) blanks = 1; } else blanks = 0; if (tosp_debug_level > 5) tprintf ("Repch wd (%d,%d) rep gap %5.2f; Lgap:%d (%d blanks);", word->bounding_box ().left (), word->bounding_box ().bottom (), repetition_spacing, current_gap, blanks); word->set_blanks (blanks); //NO uncertainty word->set_flag (W_FUZZY_SP, FALSE); word->set_flag (W_FUZZY_NON, FALSE); /* Set spaces after repeated char word (and leave current word set) */ current_gap = blob_box.left () - next_rep_char_word_right; if (current_gap > tosp_rep_space * repetition_spacing) { blanks = (uinT8) (current_gap / row->space_size); if (blanks < 1) blanks = 1; } else blanks = 0; if (tosp_debug_level > 5) tprintf (" Rgap:%d (%d blanks)\n", current_gap, blanks); fuzzy_sp = FALSE; fuzzy_non = FALSE; if (rep_char_it.empty ()) { next_rep_char_word_right = MAX_INT32; } else { rep_char_it.forward (); next_rep_char_word_right = rep_char_it.data ()->bounding_box ().right (); } } if (box_it.at_first () && rep_char_it.empty ()) { //at end of line word->set_flag (W_EOL, TRUE); xstarts[1] = prev_x; } else { prev_blanks = blanks; prev_fuzzy_sp = fuzzy_sp; prev_fuzzy_non = fuzzy_non; } } } } while (!box_it.at_first ()); //until back at start /* Insert any further repeated char words */ while (!rep_char_it.empty ()) { word = rep_char_it.extract (); word_it.add_after_then_move (word); /* Set spaces before repeated char word */ repetition_spacing = find_mean_blob_spacing (word); current_gap = word->bounding_box ().left () - prev_x; if (current_gap > tosp_rep_space * repetition_spacing) { blanks = (uinT8) floor (current_gap / row->space_size); if (blanks < 1) blanks = 1; } else blanks = 0; if (tosp_debug_level > 5) tprintf ("Repch wd at EOL (%d,%d). rep spacing %d; Lgap:%d (%d blanks)\n", word->bounding_box ().left (), word->bounding_box ().bottom (), repetition_spacing, current_gap, blanks); word->set_blanks (blanks); //NO uncertainty word->set_flag (W_FUZZY_SP, FALSE); word->set_flag (W_FUZZY_NON, FALSE); prev_x = word->bounding_box ().right (); if (rep_char_it.empty ()) { //at end of line word->set_flag (W_EOL, TRUE); xstarts[1] = prev_x; } else { rep_char_it.forward (); } } coeffs[0] = 0; coeffs[1] = row->line_m (); coeffs[2] = row->line_c (); real_row = new ROW (row, (inT16) row->kern_size, (inT16) row->space_size); word_it.set_to_list (real_row->word_list ()); //put words in row word_it.add_list_after (&words); real_row->recalc_bounding_box (); if (tosp_debug_level > 4) { tprintf ("Row: Made %d words in row ((%d,%d)(%d,%d))\n", word_count, real_row->bounding_box ().left (), real_row->bounding_box ().bottom (), real_row->bounding_box ().right (), real_row->bounding_box ().top ()); } return real_row; } return NULL; } /********************************************************************** * make_blob_words * * Converts words into blobs so that each blob is a single character. * Used for chopper test. **********************************************************************/ ROW *Textord::make_blob_words( TO_ROW *row, // row to make FCOORD rotation // for drawing ) { bool bol; // start of line ROW *real_row; // output row C_OUTLINE_IT cout_it; C_BLOB_LIST cblobs; C_BLOB_IT cblob_it = &cblobs; WERD_LIST words; WERD_IT word_it; // new words WERD *word; // new word double coeffs[3]; // quadratic BLOBNBOX *bblob; // current blob TBOX blob_box; // bounding box BLOBNBOX_IT box_it; // iterator inT16 word_count = 0; cblob_it.set_to_list(&cblobs); box_it.set_to_list(row->blob_list()); word_it.set_to_list(&words); bol = TRUE; if (!box_it.empty()) { do { bblob = box_it.data(); blob_box = bblob->bounding_box(); if (bblob->joined_to_prev()) { if (bblob->cblob() != NULL) { cout_it.set_to_list(cblob_it.data()->out_list()); cout_it.move_to_last(); cout_it.add_list_after(bblob->cblob()->out_list()); delete bblob->cblob(); } } else { if (bblob->cblob() != NULL) cblob_it.add_after_then_move(bblob->cblob()); } box_it.forward(); // next one bblob = box_it.data(); blob_box = bblob->bounding_box(); if (!bblob->joined_to_prev() && !cblobs.empty()) { word = new WERD(&cblobs, 1, NULL); word_count++; word_it.add_after_then_move(word); if (bol) { word->set_flag(W_BOL, TRUE); bol = FALSE; } if (box_it.at_first()) { // at end of line word->set_flag(W_EOL, TRUE); } } } while (!box_it.at_first()); // until back at start /* Setup the row with created words. */ coeffs[0] = 0; coeffs[1] = row->line_m(); coeffs[2] = row->line_c(); real_row = new ROW(row, (inT16) row->kern_size, (inT16) row->space_size); word_it.set_to_list(real_row->word_list()); //put words in row word_it.add_list_after(&words); real_row->recalc_bounding_box(); if (tosp_debug_level > 4) { tprintf ("Row:Made %d words in row ((%d,%d)(%d,%d))\n", word_count, real_row->bounding_box().left(), real_row->bounding_box().bottom(), real_row->bounding_box().right(), real_row->bounding_box().top()); } return real_row; } return NULL; } BOOL8 Textord::make_a_word_break( TO_ROW *row, // row being made TBOX blob_box, // for next_blob // how many blanks? inT16 prev_gap, TBOX prev_blob_box, inT16 real_current_gap, inT16 within_xht_current_gap, TBOX next_blob_box, inT16 next_gap, uinT8 &blanks, BOOL8 &fuzzy_sp, BOOL8 &fuzzy_non, BOOL8& prev_gap_was_a_space, BOOL8& break_at_next_gap) { BOOL8 space; inT16 current_gap; float fuzzy_sp_to_kn_limit; if (break_at_next_gap) { break_at_next_gap = FALSE; return TRUE; } /* Inhibit using the reduced gap if The kerning is large - chars are not kerned and reducing "f"s can cause erroneous blanks OR The real gap is less than 0 OR The real gap is less than the kerning estimate */ if ((row->kern_size > tosp_large_kerning * row->xheight) || ((tosp_dont_fool_with_small_kerns >= 0) && (real_current_gap < tosp_dont_fool_with_small_kerns * row->kern_size))) //Ignore the difference within_xht_current_gap = real_current_gap; if (tosp_use_xht_gaps && tosp_only_use_xht_gaps) current_gap = within_xht_current_gap; else current_gap = real_current_gap; if (tosp_old_to_method) { //Boring old method space = current_gap > row->max_nonspace; if (space && (current_gap < MAX_INT16)) { if (current_gap < row->min_space) { if (current_gap > row->space_threshold) { blanks = 1; fuzzy_sp = TRUE; fuzzy_non = FALSE; } else { blanks = 0; fuzzy_sp = FALSE; fuzzy_non = TRUE; } } else { blanks = (uinT8) (current_gap / row->space_size); if (blanks < 1) blanks = 1; fuzzy_sp = FALSE; fuzzy_non = FALSE; } } return space; } else { /* New exciting heuristic method */ if (prev_blob_box.null_box ()) // Beginning of row prev_gap_was_a_space = TRUE; //Default as old TO space = current_gap > row->space_threshold; /* Set defaults for the word break incase we find one. Currently there are no fuzzy spaces. Depending on the reliability of the different heuristics we may need to set PARTICULAR spaces to fuzzy or not. The values will ONLY be used if the function returns TRUE - ie the word is to be broken. */ blanks = (uinT8) (current_gap / row->space_size); if (blanks < 1) blanks = 1; fuzzy_sp = FALSE; fuzzy_non = FALSE; /* If xht measure causes gap to flip one of the 3 thresholds act accordingly - despite any other heuristics - the MINIMUM action is to pass a fuzzy kern to context. */ if (tosp_use_xht_gaps && (real_current_gap <= row->max_nonspace) && (within_xht_current_gap > row->max_nonspace)) { space = TRUE; fuzzy_non = TRUE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 20, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if (tosp_use_xht_gaps && (real_current_gap <= row->space_threshold) && (within_xht_current_gap > row->space_threshold)) { space = TRUE; if (tosp_flip_fuzz_kn_to_sp) fuzzy_sp = TRUE; else fuzzy_non = TRUE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 21, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if (tosp_use_xht_gaps && (real_current_gap < row->min_space) && (within_xht_current_gap >= row->min_space)) { space = TRUE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 22, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if (tosp_force_wordbreak_on_punct && !suspected_punct_blob(row, prev_blob_box) && suspected_punct_blob(row, blob_box)) { break_at_next_gap = TRUE; } /* Now continue with normal heuristics */ else if ((current_gap < row->min_space) && (current_gap > row->space_threshold)) { /* Heuristics to turn dubious spaces to kerns */ if (tosp_pass_wide_fuzz_sp_to_context > 0) fuzzy_sp_to_kn_limit = row->kern_size + tosp_pass_wide_fuzz_sp_to_context * (row->space_size - row->kern_size); else fuzzy_sp_to_kn_limit = 99999.0f; /* If current gap is significantly smaller than the previous space the other side of a narrow blob then this gap is a kern. */ if ((prev_blob_box.width () > 0) && narrow_blob (row, prev_blob_box) && prev_gap_was_a_space && (current_gap <= tosp_gap_factor * prev_gap)) { if ((tosp_all_flips_fuzzy) || (current_gap > fuzzy_sp_to_kn_limit)) { if (tosp_flip_fuzz_sp_to_kn) fuzzy_non = TRUE; else fuzzy_sp = TRUE; } else space = FALSE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 1, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } /* If current gap not much bigger than the previous kern the other side of a narrow blob then this gap is a kern as well */ else if ((prev_blob_box.width () > 0) && narrow_blob (row, prev_blob_box) && !prev_gap_was_a_space && (current_gap * tosp_gap_factor <= prev_gap)) { if ((tosp_all_flips_fuzzy) || (current_gap > fuzzy_sp_to_kn_limit)) { if (tosp_flip_fuzz_sp_to_kn) fuzzy_non = TRUE; else fuzzy_sp = TRUE; } else space = FALSE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 2, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if ((next_blob_box.width () > 0) && narrow_blob (row, next_blob_box) && (next_gap > row->space_threshold) && (current_gap <= tosp_gap_factor * next_gap)) { if ((tosp_all_flips_fuzzy) || (current_gap > fuzzy_sp_to_kn_limit)) { if (tosp_flip_fuzz_sp_to_kn) fuzzy_non = TRUE; else fuzzy_sp = TRUE; } else space = FALSE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 3, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if ((next_blob_box.width () > 0) && narrow_blob (row, next_blob_box) && (next_gap <= row->space_threshold) && (current_gap * tosp_gap_factor <= next_gap)) { if ((tosp_all_flips_fuzzy) || (current_gap > fuzzy_sp_to_kn_limit)) { if (tosp_flip_fuzz_sp_to_kn) fuzzy_non = TRUE; else fuzzy_sp = TRUE; } else space = FALSE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 4, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if ((((next_blob_box.width () > 0) && narrow_blob (row, next_blob_box)) || ((prev_blob_box.width () > 0) && narrow_blob (row, prev_blob_box)))) { fuzzy_sp = TRUE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 6, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } } else if ((current_gap > row->max_nonspace) && (current_gap <= row->space_threshold)) { /* Heuristics to turn dubious kerns to spaces */ /* TRIED THIS BUT IT MADE THINGS WORSE if ( prev_gap == MAX_INT16 ) prev_gap = 0; // start of row if ( next_gap == MAX_INT16 ) next_gap = 0; // end of row */ if ((prev_blob_box.width () > 0) && (next_blob_box.width () > 0) && (current_gap >= tosp_kern_gap_factor1 * MAX (prev_gap, next_gap)) && wide_blob (row, prev_blob_box) && wide_blob (row, next_blob_box)) { space = TRUE; /* tosp_flip_caution is an attempt to stop the default changing in cases where there is a large difference between the kern and space estimates. See problem in 'chiefs' where "have" gets split in the quotation. */ if ((tosp_flip_fuzz_kn_to_sp) && ((tosp_flip_caution <= 0) || (tosp_flip_caution * row->kern_size > row->space_size))) fuzzy_sp = TRUE; else fuzzy_non = TRUE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 7, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if (prev_blob_box.width() > 0 && next_blob_box.width() > 0 && current_gap > 5 && // Rule 9 handles small gap, big ratio. current_gap >= tosp_kern_gap_factor2 * MAX(prev_gap, next_gap) && !(narrow_blob(row, prev_blob_box) || suspected_punct_blob(row, prev_blob_box)) && !(narrow_blob(row, next_blob_box) || suspected_punct_blob(row, next_blob_box))) { space = TRUE; fuzzy_non = TRUE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 8, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } else if ((tosp_kern_gap_factor3 > 0) && (prev_blob_box.width () > 0) && (next_blob_box.width () > 0) && (current_gap >= tosp_kern_gap_factor3 * MAX (prev_gap, next_gap)) && (!tosp_rule_9_test_punct || (!suspected_punct_blob (row, prev_blob_box) && !suspected_punct_blob (row, next_blob_box)))) { space = TRUE; fuzzy_non = TRUE; #ifndef GRAPHICS_DISABLED mark_gap (blob_box, 9, prev_gap, prev_blob_box.width (), current_gap, next_blob_box.width (), next_gap); #endif } } if (tosp_debug_level > 10) tprintf("word break = %d current_gap = %d, prev_gap = %d, " "next_gap = %d\n", space ? 1 : 0, current_gap, prev_gap, next_gap); prev_gap_was_a_space = space && !(fuzzy_non); return space; } } BOOL8 Textord::narrow_blob(TO_ROW *row, TBOX blob_box) { BOOL8 result; result = ((blob_box.width () <= tosp_narrow_fraction * row->xheight) || (((float) blob_box.width () / blob_box.height ()) <= tosp_narrow_aspect_ratio)); return result; } BOOL8 Textord::wide_blob(TO_ROW *row, TBOX blob_box) { BOOL8 result; if (tosp_wide_fraction > 0) { if (tosp_wide_aspect_ratio > 0) result = ((blob_box.width () >= tosp_wide_fraction * row->xheight) && (((float) blob_box.width () / blob_box.height ()) > tosp_wide_aspect_ratio)); else result = (blob_box.width () >= tosp_wide_fraction * row->xheight); } else result = !narrow_blob (row, blob_box); return result; } BOOL8 Textord::suspected_punct_blob(TO_ROW *row, TBOX box) { BOOL8 result; float baseline; float blob_x_centre; /* Find baseline of centre of blob */ blob_x_centre = (box.right () + box.left ()) / 2.0; baseline = row->baseline.y (blob_x_centre); result = (box.height () <= 0.66 * row->xheight) || (box.top () < baseline + row->xheight / 2.0) || (box.bottom () > baseline + row->xheight / 2.0); return result; } void Textord::peek_at_next_gap(TO_ROW *row, BLOBNBOX_IT box_it, TBOX &next_blob_box, inT16 &next_gap, inT16 &next_within_xht_gap) { TBOX next_reduced_blob_box; TBOX bit_beyond; BLOBNBOX_IT reduced_box_it = box_it; next_blob_box = box_next (&box_it); next_reduced_blob_box = reduced_box_next (row, &reduced_box_it); if (box_it.at_first ()) { next_gap = MAX_INT16; next_within_xht_gap = MAX_INT16; } else { bit_beyond = box_it.data ()->bounding_box (); next_gap = bit_beyond.left () - next_blob_box.right (); bit_beyond = reduced_box_next (row, &reduced_box_it); next_within_xht_gap = bit_beyond.left () - next_reduced_blob_box.right (); } } #ifndef GRAPHICS_DISABLED void Textord::mark_gap( TBOX blob, // blob following gap inT16 rule, // heuristic id inT16 prev_gap, inT16 prev_blob_width, inT16 current_gap, inT16 next_blob_width, inT16 next_gap) { ScrollView::Color col; //of ellipse marking flipped gap switch (rule) { case 1: col = ScrollView::RED; break; case 2: col = ScrollView::CYAN; break; case 3: col = ScrollView::GREEN; break; case 4: col = ScrollView::BLACK; break; case 5: col = ScrollView::MAGENTA; break; case 6: col = ScrollView::BLUE; break; case 7: col = ScrollView::WHITE; break; case 8: col = ScrollView::YELLOW; break; case 9: col = ScrollView::BLACK; break; case 20: col = ScrollView::CYAN; break; case 21: col = ScrollView::GREEN; break; case 22: col = ScrollView::MAGENTA; break; default: col = ScrollView::BLACK; } if (textord_show_initial_words) { to_win->Pen(col); /* if (rule < 20) //interior_style(to_win, INT_SOLID, FALSE); else //interior_style(to_win, INT_HOLLOW, TRUE);*/ //x radius to_win->Ellipse (current_gap / 2.0f, blob.height () / 2.0f, //y radius //x centre blob.left () - current_gap / 2.0f, //y centre blob.bottom () + blob.height () / 2.0f); } if (tosp_debug_level > 5) tprintf (" (%d,%d) Sp<->Kn Rule %d %d %d %d %d\n", blob.left () - current_gap / 2, blob.bottom (), rule, prev_gap, prev_blob_width, current_gap, next_blob_width, next_gap); } #endif float Textord::find_mean_blob_spacing(WERD *word) { C_BLOB_IT cblob_it; TBOX blob_box; inT32 gap_sum = 0; inT16 gap_count = 0; inT16 prev_right; cblob_it.set_to_list (word->cblob_list ()); if (!cblob_it.empty ()) { cblob_it.mark_cycle_pt (); prev_right = cblob_it.data ()->bounding_box ().right (); //first blob cblob_it.forward (); for (; !cblob_it.cycled_list (); cblob_it.forward ()) { blob_box = cblob_it.data ()->bounding_box (); gap_sum += blob_box.left () - prev_right; gap_count++; prev_right = blob_box.right (); } } if (gap_count > 0) return (gap_sum / (float) gap_count); else return 0.0f; } BOOL8 Textord::ignore_big_gap(TO_ROW *row, inT32 row_length, GAPMAP *gapmap, inT16 left, inT16 right) { inT16 gap = right - left + 1; if (tosp_ignore_big_gaps > 999) return FALSE; //Dont ignore if (tosp_ignore_big_gaps > 0) return (gap > tosp_ignore_big_gaps * row->xheight); if (gap > tosp_ignore_very_big_gaps * row->xheight) return TRUE; if (tosp_ignore_big_gaps == 0) { if ((gap > 2.1 * row->xheight) && (row_length > 20 * row->xheight)) return TRUE; if ((gap > 1.75 * row->xheight) && ((row_length > 35 * row->xheight) || gapmap->table_gap (left, right))) return TRUE; } else { /* ONLY time gaps < 3.0 * xht are ignored is when they are part of a table */ if ((gap > gapmap_big_gaps * row->xheight) && gapmap->table_gap (left, right)) return TRUE; } return FALSE; } /********************************************************************** * reduced_box_next * * Compute the bounding box of this blob with merging of x overlaps * but no pre-chopping. * Then move the iterator on to the start of the next blob. * DONT reduce the box for small things - eg punctuation. **********************************************************************/ TBOX Textord::reduced_box_next( TO_ROW *row, // current row BLOBNBOX_IT *it // iterator to blobds ) { BLOBNBOX *blob; //current blob BLOBNBOX *head_blob; //place to store box TBOX full_box; //full blob boundg box TBOX reduced_box; //box of significant part inT16 left_above_xht; //ABOVE xht left limit inT16 new_left_above_xht; //ABOVE xht left limit blob = it->data (); if (blob->red_box_set ()) { reduced_box = blob->reduced_box (); do { it->forward(); blob = it->data(); } while (blob->cblob() == NULL || blob->joined_to_prev()); return reduced_box; } head_blob = blob; full_box = blob->bounding_box (); reduced_box = reduced_box_for_blob (blob, row, &left_above_xht); do { it->forward (); blob = it->data (); if (blob->cblob() == NULL) //was pre-chopped full_box += blob->bounding_box (); else if (blob->joined_to_prev ()) { reduced_box += reduced_box_for_blob(blob, row, &new_left_above_xht); left_above_xht = MIN (left_above_xht, new_left_above_xht); } } //until next real blob while (blob->cblob() == NULL || blob->joined_to_prev()); if ((reduced_box.width () > 0) && ((reduced_box.left () + tosp_near_lh_edge * reduced_box.width ()) < left_above_xht) && (reduced_box.height () > 0.7 * row->xheight)) { #ifndef GRAPHICS_DISABLED if (textord_show_initial_words) reduced_box.plot (to_win, ScrollView::YELLOW, ScrollView::YELLOW); #endif } else reduced_box = full_box; head_blob->set_reduced_box (reduced_box); return reduced_box; } /************************************************************************* * reduced_box_for_blob() * Find box for blob which is the same height and y position as the whole blob, * but whose left limit is the left most position of the blob ABOVE the * baseline and whose right limit is the right most position of the blob BELOW * the xheight. * * * !!!!!!! WONT WORK WITH LARGE UPPER CASE CHARS - T F V W - look at examples on * "home". Perhaps we need something which say if the width ABOVE the * xht alone includes the whole of the reduced width, then use the full * blob box - Might still fail on italic F * * Alternatively we could be a little less severe and only reduce the * left and right edges by half the difference between the full box and * the reduced box. * * NOTE that we need to rotate all the coordinates as * find_blob_limits finds the y min and max within a specified x band *************************************************************************/ TBOX Textord::reduced_box_for_blob( BLOBNBOX *blob, TO_ROW *row, inT16 *left_above_xht) { float baseline; float blob_x_centre; float left_limit; float right_limit; float junk; TBOX blob_box; /* Find baseline of centre of blob */ blob_box = blob->bounding_box (); blob_x_centre = (blob_box.left () + blob_box.right ()) / 2.0; baseline = row->baseline.y (blob_x_centre); /* Find LH limit of blob ABOVE the xht. This is so that we can detect certain caps ht chars which should NOT have their box reduced: T, Y, V, W etc */ left_limit = (float) MAX_INT32; junk = (float) -MAX_INT32; find_cblob_hlimits(blob->cblob(), (baseline + 1.1 * row->xheight), static_cast(MAX_INT16), left_limit, junk); if (left_limit > junk) *left_above_xht = MAX_INT16; //No area above xht else *left_above_xht = (inT16) floor (left_limit); /* Find reduced LH limit of blob - the left extent of the region ABOVE the baseline. */ left_limit = (float) MAX_INT32; junk = (float) -MAX_INT32; find_cblob_hlimits(blob->cblob(), baseline, static_cast(MAX_INT16), left_limit, junk); if (left_limit > junk) return TBOX (); //no area within xht so return empty box /* Find reduced RH limit of blob - the right extent of the region BELOW the xht. */ junk = (float) MAX_INT32; right_limit = (float) -MAX_INT32; find_cblob_hlimits(blob->cblob(), static_cast(-MAX_INT16), (baseline + row->xheight), junk, right_limit); if (junk > right_limit) return TBOX (); //no area within xht so return empty box return TBOX (ICOORD ((inT16) floor (left_limit), blob_box.bottom ()), ICOORD ((inT16) ceil (right_limit), blob_box.top ())); } } // namespace tesseract