Patent ID: 8817329
Filing Date: 2014-08-26
Classification: G01J

Abstract:
1. A color measuring device comprising: an obtaining unit configured to obtain RGB values of an object whose color is to be measured; a reference value storage unit configured to store reference colorimetric values and imaged reference RGB values in association with each other, the reference colorimetric values being device-independent colorimetric values of respective colors of reference color patches in a predetermined color space, the imaged reference RGB values being RGB values of the respective colors of the reference color patches that are obtained as the object by the obtaining unit; a reference-value linear transformation matrix calculating unit configured to calculate a reference-value linear transformation matrix for converting the imaged reference RGB value into the reference colorimetric value for each of the reference color patches; an imaged colorimetric value calculating unit configured to convert a color-measurement RGB value of a predetermined color measurement object obtained by the obtaining unit into an imaged colorimetric value by using the corresponding reference-value linear transformation matrix to calculate the imaged colorimetric value of the predetermined color measurement object; a patch selecting unit configured to select a predetermined number of reference color patches of which the reference colorimetric values each have a close distance from the imaged colorimetric value in the predetermined color space, from among the reference color patches; an RGB selecting unit configured to select, as selection RGB values, the imaged reference RGB values of the selected reference color patches; a selection-RGB-value linear transformation matrix calculating unit configured to calculate a selection-RGB-value linear transformation matrix for converting the selection RGB values into the reference colorimetric values; and a colorimetric value converting unit configured to convert the color-measurement RGB value of the color measurement object obtained by the obtaining unit into a colorimetric value by using the selection-RGB-value linear transformation matrix.