Patent ID: 11928842
Assignee: NATIONAL CHUNG HSING UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. An apparatus for measuring chromaticity of a target object, comprising:
a data storage medium that stores a plurality of light source spectrum datasets each associated with a specific object;
an image capturing unit; and
a processor connected to said data storage medium and said image capturing unit, and configured to
control said image capturing unit to obtain a captured color image of the target object,
generate a spectral image based on the captured color image using a spectral transformation matrix,
obtain one of the plurality of light source spectrum datasets that is associated with the target object, and
calculate a chromaticity dataset of the target object based on the spectral image and the one of the plurality of light source spectrum datasets;
wherein said processor is further configured to calculate the chromaticity dataset of the target object by:
for each of a plurality of pixels contained in the spectral image, obtaining a set of tristimulus values using a plurality of color matching functions of the CIE 1931 XYZ color space; and
calculating the chromaticity dataset of the target object based on the sets of tristimulus values respectively obtained for the pixels contained in the spectral image.