Transcoding method
AssigneeMediatek Inc.
InventorPing-Yi CHEN
Life of this patent
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Abstract
A method for transcoding a first codeword to a second codeword, wherein both comprise escape codes and escape levels is disclosed. The method comprises receiving a bitstream to determine the first codeword therefrom, determining whether the first codeword belongs to a long escape mode or a short escape mode, and truncating the escape level of the first codeword to generate the second codeword when the first codeword belongs to the long escape mode. An embodiment of the first codeword is a Sorenson H.263 codeword and the second codeword is an H.263 codeword.
Claims14
A method for transcoding a first codeword to a second codeword, wherein both comprise escape codes and escape levels, and the method comprising:
- receiving a bitstream to determine the first codeword therefrom;
- determining whether the first codeword belongs to a long escape mode or a short escape mode;
- and
- truncating the escape level of the first codeword to generate the second codeword when the first codeword belongs to the long escape mode.
A method of transcoding a first codeword to a second codeword, wherein both comprise escape codes and escape levels, and the method comprising:
- receiving a bitstream to determine the first codeword therefrom;
- determining whether the first codeword belongs to a long escape mode or a short escape mode;
- decoding and de-quantizing the first codeword to produce block coefficients of an image block when the first codeword belongs to a long escape mode;
- and
- re-quantizing the block coefficients to generate a new escape level of the second codeword such that the new escape level is less than the maximal escape level of the second codeword.
Dependencies are inferred from the claim text.