An imaging apparatus including: a single-chip image sensor with a color filter array and capable of intermittent readout operation in horizontal and vertical directions; an intermittence control means for controlling the intermittent readout operation of the image sensor; and an interpolation means for processing signals read out from the image sensor in a thinned out pattern designated by the intermittence control means to form a reduced image consisting of trichromatic components; wherein the intermittence control means reads signals at a plurality of locations on the image sensor correspondingly to each pixel of the reduced image and controls reading at that time so that there are two or more types of color filters at the readout locations and at least one type of the color filters thereof is common to all pixels of the reduced image and at least one type of the color filters is not common to all pixels of the reduced image; and the interpolation means supplements signals corresponding to the type of unread color filter at each pixel of the reduced image to compute trichromatic components of an observed pixel.