The M66335 is a facsimile image processing controller to turn into binary signals analog signals which have been output through photoelectric conversion by the image sensor. The image processing functions includes peak value detection, uniformity correction, resolution change, MTF compensation, correction, detection of background/character levels, error diffusion, separation of image zones, and designation of regions. This controller contains not only the analog processing circuit, the A/ D converter of a 7-bit flash type and image processing memory, but also the image sensor and the interface circuit to the CODEC (Coder and Decoder). Therefore, this LSI alone is capable of image processing.