An image processing circuit inputs pixels of an RGB Bayer array therein. A
chroma value calculation circuit calculates a chroma factor (K.sub.L) for
evaluating the chroma of a surrounding area of a specified pixel. A
correlation value calculation circuit calculates correlation values for
gray image and color image. If the chroma factor (K.sub.L) is larger than
a threshold value (TH1), a correlation judgment method for color image
and a pixel interpolation method for color image are selected, if the
chroma factor (K.sub.L) is not larger than a threshold value (TH1) and
larger than a threshold value (TH2), a correlation judgment method using
a correlation value obtained by overall judgment on the correlation
values for gray image and color image and a pixel interpolation method
for color image are selected, and if the chroma factor (K.sub.L) is not
larger than a threshold value (TH2), a correlation judgment method for
gray image and a pixel interpolation method for gray image are selected.
