| 摘要 |
A video data compression apparatus comprises a motion vector generator for performing block matching by detecting block differences between a block of one image and a plurality of blocks of an adjacent image for generating a motion vector from the pair of blocks having the best match. A combining means combines the block differences across blocks of each image and a scene change detector detects scene change in the input video signal by detecting changes in the combined block difference values from image to image. A second invention describes an adaptive encoder that operates to compress an image in accordance with a target data output. Where a scene change is detected the target output is adjusted to take this into account. |
