Patent ID: 7986447
Filing Date: 2011-07-26
Classification: H04N

Abstract:
1. A color image scanning system comprising: a storage unit to store look-up tables having correction values of first color data, obtained by scanning a first printing paper having a plurality of color patches, each of the look-up tables corresponding to a type of printing paper and a kind of image on the printing paper; a sensor unit measuring reflectance of a second printing paper; a histogram generation unit generating a hue histogram relative to second color data obtained by scanning the second printing paper; a judgment unit judging the kind of the second printing paper according to the measurement result, and judging the kind of the image in the second printing paper according to the analysis result of the hue histogram; and a final image generation unit to correct the second color data with reference to a look-up table of the look-up tables, the look-up table corresponding to the type of printing paper used by the second printing paper and the kind of image on the second printing paper wherein the judgment unit analyzes the hue histogram generated by the histogram generation unit and judges the kind of image included in the second printing paper and if the analysis result of the hue histogram is discontinuous, the judgment unit judges that the second printing paper includes a graphic image, and if the analysis result of the hue histogram is continuous and a frequency of the hue value in the skin color region is equal to or larger than a critical value, the judgment unit judges that the second printing paper includes a character image, and if the hue value is continuous but the frequency of the hue value in the skin color region is smaller than the critical value, the judgment unit judges that the second printing paper includes an image other than the character image and the graphic image.