The SN9C102 is a single-chip backend processor to pair with a CMOS image sensor. It reads a 9 or 8 bits input raw image data (RGB Bayer pattern) from an image capturing device and outputs through a USB port into the PC. This chip includes a simply color processing engine, an image compression engine, a dark calibration, a hardware image windowing with random image size selection, panning and scaling functions. The SN9C102 can directly transmit the compressed or un-compressed image data to the USB port without any extra memory support. Its multi-powerful functions and special designed architecture make this chip suitable for extra low cost USB PC camera application.