| 摘要 |
<p>PROBLEM TO BE SOLVED: To acquire information on color values without using a large-scale storage area.SOLUTION: When color values of a predetermined number or more of continuous pixels match with each other on the basis of the color value for each of the pixels of input image information, a color value registration list creation unit 226 creates a color value registration list including the color value and the frequency at which the color values match for each of the matching color values. A color value confirmation list creation unit 228 creates a color value confirmation list corresponding to the color value registration list for each of the color value registration lists created for each page by the color value registration list creation unit 226, in particular, determines whether or not a value of the frequency in each page is equal to or larger than a threshold in ascending order of the entry number, and adds, to the color value confirmation list, the entry of a pair having the same color value and attribute as the entry having a value of the frequency in a page equal to or larger than the threshold.</p> |
