| 摘要 |
In one embodiment, an edge or border processor modifies the undisplayed edges of an uncompressed video input signal before it is applied to a compression engine. This configuration reduces the number of bits used in the compression process. The undisplayed edges of the video signal are modified either by being turned black, by blurring, or by copying, depending on the application. As an aspect of this embodiment, the edge processing functions are integrated into the compression engine or video encoder. In another embodiment, edges of the uncompressed video input signal are not preprocessed prior to encoding the signal. Instead, a video encoder includes a motion estimator with special edge processing that, e.g., uses only zero motion vectors for edge macroblocks. Further, the video encoder includes a quantization processor having a special edge processor. In either embodiment, the configuration of the output bit stream is compatible with the MPEG-2 standard.
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