Method and apparatus for partially recompressing digital...

Details Method and apparatus for partially recompressing digital... Method and apparatus for partially recompressing digital...

H - Electricity

04

N

H04N 7/50 (2006.01) H04N 7/10 (2006.01) H04N 7/26 (2006.01) H04N 7/24 (2006.01)

Patent

CA 2160300

A method and apparatus are provided for changing the compression level of digital information, such as digital video information. After having been compressed by a first compression scheme that provides quantized transform coefficients, the digital information is partially decompressed to recover the transform coefficients as they were prior to quantizing. The transform coefficients are then requantized at a different compression level. Complexity and expense are reduced by only partially decompressing and requantizing the previously compressed information to modify its compression level without the need to provide components such as a motion compensation processor and frame store that would be required for full decompression of the information prior to recompression.

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