| 摘要 |
The present invention is directed to provide a technique of interpolating a green signal efficiently with excellent reproducibility of a high frequency pattern while suppressing an interpolation error. A process of interpolating a green signal in an image signal outputted from a CCD image pickup device 13 having a Bayer pattern is performed. A G signal interpolating unit 21 extracts green light sensing pixels of total n pieces (where n denotes an integer of four or larger) which include two nearest neighbor green light sensing pixels in an oblique direction and exist in the same direction from a green image signal obtained from the CCD image pickup device 13. The (n-1)th order function for approximating the illumination distribution of a green image received by the n green light sensing pixels is set, and the signal value of a pixel to be interpolated which is positioned in the same direction as the n pixels is derived from the (n-1)th order function.
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