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AssigneeEMC Corporation
InventorsUgur Sezer, Sorin Faibish, Seyfullah H. Oguz, Wayne W. Duso
Estimating the term…
Transform coefficients for blocks of pixels in an original picture are quantized to produce respective sets of quantization indices for the blocks of pixels. The quantization indices for at least some of the blocks are produced by using a quantization step size that is not uniform within each block. Largest magnitude quantization indices are selected from the respective sets of quantization indices for (run, level) encoding to produce the (run, level) encoded picture. For example, MPEG-2 coded video includes a set of non-zero AC discrete cosine transform (DCT) coefficients for 8×8 blocks of pixels. For scaling the MPEG-2 coded video, non-zero AC DCT coefficients are removed from the MPEG-2 coded video to produce reduced-quality MPEG-2 coded video that includes no more than a selected number of largest magnitude quantization indices for the non-zero AC DCT coefficients for each 8×8 block.
A method of producing a (run, level) encoded picture from an original picture, said method comprising:
A method of scaling non-scalable MPEG-2 coded video to produce reduced-bandwidth, reduced-quality MPEG-2 coded video, the non-scalable MPEG-2 coded video including a set of non-zero AC discrete cosine transform (DCT) coefficients for 8×8 blocks of the non-scalable MPEG-2 coded video, said method comprising removing non-zero AC DCT coefficients from the non-scalable MPEG-2 coded video so that the reduced-quality MPEG-2 coded video includes no more than a selected number of largest magnitude quantization indices for the non-zero AC DCT coefficients for each 8×8 block.
A digital computer programmed for producing a (run, level) encoded picture from an original picture, wherein the digital computer comprises at least one processor programmed for:
A digital computer for scaling non-scalable MPEG-2 coded video to produce reduced-bandwidth, reduced-quality MPEG-2 coded video, the non-scalable MPEG-2 coded video including a set of non-zero AC discrete cosine transform (DCT) coefficients for 8×8 blocks of the non-scalable MPEG-2 coded video, the digital computer comprising a processor programmed for removing non-zero AC DCT coefficients from the non-scalable MPEG-2 coded video so that the reduced-quality MPEG-2 coded video includes no more than a selected number of largest magnitude quantization indices for the non-zero AC DCT coefficients for each 8×8 block.
Dependencies are inferred from the claim text.