/*
 * The method is present in: Uses the mean of grey levels as the threshold. It is described in:
 * Glasbey, CA (1993), "An analysis of histogram-based thresholding algorithms",
 * CVGIP: Graphical Models and Image Processing 55: 532-537
 * @param histogram - the histogram of the image
 * @param total - the number of pixels in the image
 * @returns {number} - the threshold
 */

/**
 * Return a threshold for a histogram by making its average.
 * @param histogram - Image histogram.
 * @param total - Number of pixels in the image.
 * @returns The threshold.
 */
export default function mean(histogram: Uint32Array, total: number): number {
  let sum = 0;
  for (let i = 0; i < histogram.length; i++) {
    sum += i * histogram[i];
  }
  return Math.floor(sum / total);
}