| 摘要 |
In a multimedia compression system such as is used in compressing data in a video stream, "zero blocks" from an MPEG block array are identified prior to encoding and subjecting blocks to the process of quantized discrete cosine transform (DCT). A zero block as understood herein is an MPEG video data block that results when an unencoded block of video data is identical to an adjacent un-encoded block of video data, i.e., when there is little or no change between consecutive frames of video. The efficiency of the compression system is increased in this invention by not having to perform the functions of DCT, quantization, dequantization or inverse DCT on the identified zero blocks, but simply directly encoding zero blocks.
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