IMAGE PROCESSING APPARATUS, IMAGE FORMING APPARATUS, IMAGE PROCESSING METHOD, IMAGE PROCESSING PROGRAM, AND STORAGE MEDIUM OF THE SAME

摘要

PROBLEM TO BE SOLVED: To distinguish background of an original from a background image printed by a printer.SOLUTION: An original feature determination section (13) determines that background removal is required when, out of a maximum value of frequency in a histogram of a signal of each pixel, a ratio of a maximum value positioned on a side where it is greater than or equal to a background determination threshold value T1 and density is largest and a frequency at a density section X+i positioned on a side where density is smaller by the number of density sections i against a density section X corresponding to the maximum value is greater than or equal to a background presence determination threshold value T2.SELECTED DRAWING: Figure 1