Color image sensor defect detector using differentiated I and Q

Details Color image sensor defect detector using differentiated I and Q Color image sensor defect detector using differentiated I and Q

1990-11-29

1992-06-09

Ng, Jin F.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358406, 358483, 355203, H04N 104, H04N 140

Patent

active

051211998

ABSTRACT:
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.

REFERENCES:
patent: 3778541 (1973-12-01), Bowker
patent: 4772958 (1988-09-01), Suzuki et al.
patent: 4811047 (1989-03-01), Hosaka et al.
patent: 4839721 (1989-06-01), Abdulwahab et al.

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