Patent ID: 8824029

Claim:
A color calibration method for an image processing device, the color calibration method comprising: obtaining a first image of a calibration card, wherein the calibration card has a plurality of color blocks, and each of the color blocks corresponds to a standard value; obtaining a plurality of first sensing values according to the first image, wherein each of the first sensing values corresponds to one of the standard values; generating a calibration table according to the first sensing values and the standard values; determining if a recursive condition is satisfied, wherein the step of determining if the recursive condition is satisfied comprises: calculating a difference according to the first sensing values and the standard values, or calculating the difference according to the third sensing values and the standard values, wherein the step of calculating the difference according to the first sensing values and the standard values comprises: calculating a sum of squared error between the first sensing values and the standard values to obtain the difference, wherein the step of calculating the difference according to the third sensing values and the standard values comprises: calculating a sum of squared error between the third sensing values and the standard values to obtain the difference; determining if the difference is less than a difference threshold; and determining the recursive condition is satisfied if the difference is less than the difference threshold; and obtaining a second image of the calibration card if the recursive condition is not satisfied, obtaining a plurality of second sensing values according to the second image, adjusting the second sensing values according to the calibration table to generate a plurality of third sensing values, and updating the calibration table according to the third sensing values and the standard values until the recursive condition is satisfied.