Patent US 8,922,656

A video processing system (10) for automatic license plate recognition (ALPR) provides an interface between video cameras (14, 16) and a host computer (20) through a single high speed USB connection (18). The system (10) supports four simultaneous composite video channels (28A, 28B, 28C, 28D) with two channels dedicated to an IR monochrome video and two channels dedicated to color video. Compression software incorporates a high speed memory for buffering and stripping unnecessary data from a digitized data stream. Monochrome channel data and color channel data are marked with an incrementing index to tag them with frame identification. As a result, processing software in the host computer can re-align the monochrome and color video information after processing a license plate image, regardless of the order of data arrival. Color overview and monochrome recognition images are provided at the same time, and thus show the same plate or vehicle.