| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image processing system in which a background removal threshold is determined in an easy processing and at a high speed. <P>SOLUTION: The image processing system includes: a histogram preparer that reads image data obtained by scanning an original line by line to prepare a histogram indicating the number of pixels for each background density of a read line; a background density estimator that estimates a background density of the read line as a density at a local maximum value in view of a highlight end of the histogram; a background removal reference value setter that sets up a background removal reference value as a reference margin based on the number of pixels normalized on the estimated background density; a background removal threshold determiner that increments the estimated background density by the background removal reference value to set a provisional background removal threshold of the read line, and determines a background removal threshold of the read line as a weighting combination of the provisional background removal threshold and a background removal threshold of a previous line; and a background remover that removes a background of the read line on the basis of the determined background removal threshold. <P>COPYRIGHT: (C)2010,JPO&INPIT |
