METHOD AND APPARATUS FOR MANIPULATING BIT STREAMS
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United States of America Patent
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Issued Date -
Mar 18, 2010
app pub date -
Oct 29, 2007
filing date -
Oct 31, 2006
priority date (Note) -
Abandoned
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Abstract
Trans-rating of successive macroblocks in a video stream occurs in accordance with the block type. For example, an (Inter) Intra-coded macroblock will generally get trans-rated using first algorithm partly decodes the macroblock and modifies coded residual coefficients by raising coefficient quantization. Intra-coded macroblocks generally get trans-rated using a second technique that operates first to decode the macroblock and then derive all the main decisions therefrom to re-encode the stream using the original decisions. Separately trans-rating Inter-coded and Intra-coded macroblocks in this manner reduces computational complexity, as compared to the use of a single trans-rating algorithm, while still maintaining good video quality.
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