Encoding images using block-based macroblock-level statistics
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United States of America Patent
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Nov 3, 1998
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app pub date -
Oct 18, 1995
filing date -
Sep 29, 1995
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Abstract
Block-level statistical measures are generated and then used to generate macroblock-level statistical measures, which are in turn used to determine how to encode the macroblocks of the image. In a preferred embodiment, a macroblock-level intra-SAD measure is generated by summing four block-level intra-SAD measures generated from the four blocks of the macroblock. The macroblock-level intra-SAD measure is then used to determine whether to encode the macroblock using intraframe encoding or interframe encoding. Basing macroblock-level statistics on block-level measures can provide a more accurate prediction as to how the macroblock would be encoded using intraframe encoding techniques.
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