import { OCRConfig } from '../types';
/**
 * Default OCR configuration
 */
export declare const DEFAULT_CONFIG: OCRConfig;
/**
 * Tesseract PSM (Page Segmentation Mode) configurations
 * PSM 6: Assume a single uniform block of text
 * PSM 3: Fully automatic page segmentation (default)
 */
export declare const TESSERACT_PSM: {
    SINGLE_BLOCK: string;
    AUTO: string;
    SINGLE_LINE: string;
    SINGLE_WORD: string;
};
/**
 * Image preprocessing constants
 */
export declare const IMAGE_PROCESSING: {
    TARGET_DPI: number;
    MIN_WIDTH: number;
    MAX_WIDTH: number;
    SHARPEN_SIGMA: number;
    CONTRAST_FACTOR: number;
    BRIGHTNESS_FACTOR: number;
};
/**
 * Currency symbols supported
 */
export declare const CURRENCY_SYMBOLS: string[];
/**
 * Common date separators
 */
export declare const DATE_SEPARATORS: string[];
/**
 * Common time separators
 */
export declare const TIME_SEPARATORS: string[];
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