B/W adaptive image grabber with analog motion vector estimator at 0.3 GOPS

The chip contains a B/W CMOS adaptive video-camera providing quarter common interface format (176/spl times/144 pels), two analog memories, a motion estimator (ME), and a small controller to synchronize computational phases. A modified scheme uses the two analog memories to compare consecutive frames. Good speed and power performance is obtained with only 0.5 dB loss in S/N ratio. A H261-compatible bit stream can be produced to interface with H261 decoders.