Unbiased Rounding for Video Compression
AssigneeDolby Laboratories Licensing Corporation
InventorsWalter Gish, Hyung-Suk Kim
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Abstract
Unbiased rounding of unsigned data is employed in the decoding or the encoding and decoding of digital bitstreams representing data-video when the video is encoded at a first bit depth and is decoded at a second bit depth, lower than the first bit depth. The unbiased rounding may be employed in processing that employs a prediction loop. When the data-compressed video is represented in frames, the unbiased rounding may be of inter-frame and/or intra-frame data.
Claims20
A method for decoding a digital bitstream representing data-compressed video encoded at a first bit depth, comprising
- decoding at a second, lower, bit depth, said decoding including the unbiased rounding of unsigned data in intermediate processing.
A method for encoding a digital bitstream representing data-compressed video, wherein the encoding includes the unbiased rounding of unsigned data in intermediate processing.
A method for encoding and decoding a digital bitstream representing data-compressed video, comprising
- encoding at a first bit depth, said encoding including the unbiased rounding of unsigned data in intermediate processing, and
- decoding at a second, lower, bit depth, said decoding including the unbiased rounding of unsigned data in intermediate processing.
A decoder for decoding a digital bitstream representing data-compressed video encoded at a first bit depth, comprising
- means for receiving the digital bitsteam, and
- means for decoding at a second, lower, bit depth, which means includes means for the unbiased rounding of unsigned data in intermediate processing.
An encoder for encoding a digital bitstream representing data-compressed video, comprising
- means for processing in a prediction loop, which processing includes the unbiased rounding of unsigned data in intermediate processing, and
- means for outputting said digital bitstream.
A system for encoding and decoding a digital bitstream representing data-compressed video, comprising
- means for encoding at a first bit depth, said encoding including means for processing in a prediction loop, which means for processing includes means for the unbiased rounding of unsigned data in intermediate processing, and
- means for decoding at a second, lower, bit depth, said means for decoding including means for processing in a prediction loop, which means for processing includes means for the unbiased rounding of unsigned data in intermediate processing.
Dependencies are inferred from the claim text.