| 摘要 |
In a CCD image sensor mounted with a mosaic filter, when color components are separated from an image signal obtained by additively synthesizing plural lines, there is a problem that a vertical resolution is deteriorated. In a color filter to be fitted to the image sensor, G and B are alternately arranged in odd columns, R and G are alternately arranged in even columns, the arrangement cycles of adjacent odd columns are deviated by one pixel in a column direction from each other, and the arrangement cycles of adjacent even columns are deviated by one pixel in the column direction from each other. An image signal processor extracts data D(a, b) and D(a, b+2) deviated by two columns from the same line (a-th line) of an image signal obtained by additively synthesizing three lines with the image sensor. D(a, b) includes a color Cx corresponding to two pixels and a color Cy corresponding to one pixel, and D(a, b+2) includes a color Cx corresponding to one pixel and a color Cy corresponding to two pixels. The color component values <Cx> and <Cy> at a sampling point P(a, b) are obtained by <Cx>=[2D(a, b)-D(a, b+2)]/3 and <Cy>=[2D(a, b+2)-D(a, b)]/3.
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