Patent ID: 7679796
Filing Date: 2010-03-16
Classification: H04N

Abstract:
1. An image processing apparatus, comprising: a background color specifying unit configured to specify a background color of an original document using RGB signals of image data acquired by reading the original document; a hue determination unit configured to determine a hue of a pixel in the image data; and a monochrome signal generation processing unit configured to generate a monochrome signal using at least one of the RGB signals according to a specification result of the background color specifying unit and a determination result of the hue determination unit, wherein, in the hue determination unit, if the hue is found to be a chromatic color, the hue is determined by comparing a hue signal with the conditional equations below: if hue signal≦thh if thh if thh if thh if thh if thh wherein the background color specifying unit calculates total frequencies of hues including black, red, yellow, green, cyan, blue, magenta, and white and compares the total frequencies of the respective hues with a specific threshold value using the conditional equations below: if a total frequency of black>bg th if a total frequency of black≦bg th if a total frequency of red>bg th if a total frequency of red ≦bg th threshold determination is performed for each of yellow, green, cyan, blue, magenta, and white in the same manner.