The M66332 is a facsimile image processing controller that converts analog signals that are photoelectrically converted by an image sensor into bi-level signals. It has image processing functions such as peak detection, uniformity correction, correction, MTF compensation, detector of background and object levels, dither control, separation of image data area, scale down, and area specification. This controller has a built-in 5-bit flash type A-D converter and interface circuits to image sensor, analog signal processing circuit, and CODEC (Coder & Decoder) to simplify control of the readout mechanism.