Method and apparatus for evaluating color image signals

Details Method and apparatus for evaluating color image signals Method and apparatus for evaluating color image signals

H - Electricity

04

N

350/1

H04N 17/02 (2006.01) G06T 7/40 (2006.01)

Patent

CA 2030920

- 14 - ABSTRACT OF THE DISCLOSURE In a color image signal evaluating apparatus and method, a color image signal corresponding to each pixel position on a display screen is converted by a color signal converter to an I signal and a Q signal, which are stored, as pixel data, in first and second image memories, each at an address corresponding to the pixel position. The I signal and Q signal read out of the first and second image memories are differentiated by first and second differentiators, respectively, with respect to the directions of pixel arrays to thereby obtain an I-signal differentiated value and a Q-signal differentiated value at each pixel position. A vector- composed value of the I-signal differentiated value and the Q-signal differentiated value at each pixel position is calculated and is stored in a third image memory. An evaluation part represents, as a factor of the degree of a color reproduction error, the magnitude of a change in the differentiated vector-composed value stored in the third image memory and compares the factor with a fixed value, thereby determining whether or not the color reproduction error is within a given limit range.

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