Non-transform coding
AssigneeMicrosoft Technology Licensing, LLC
InventorsJizheng Xu, Cuiling Lan
Life of this patent
Estimating the term…
Abstract
Techniques for selectively transforming one or more coding units when coding video content are described herein. The techniques may include determining whether or not to transform a particular coding unit. The determination may be based on a difference in pixel values of the particular coding unit and/or one or more predefined rate-distortion constraints. When it is determined to not perform a transform, the particular coding unit may be coded without transforming the particular coding unit.
Claims20
In a computer system, a method of encoding video, thereby producing encoded data as part of a bitstream, the method including, for a current block of pixel values of a frame of the video:
- determining intra-frame prediction values for the current block;
- based at least in part on the intra-frame prediction values, determining intra-frame prediction residual information for the current block;
- selectively performing a transform on the intra-frame prediction residual information for the current block, thereby producing residual values for the current block;
- quantizing the residual values for the current block;
- determining that the current block is not further split;
- and
- based at least in part on the determination that the current block is not further split, setting a flag in the bitstream, the flag at least in part indicating whether or not an inverse transform is to be used during decoding for the intra-frame prediction residual information for the current block, wherein the inverse transform is to be skipped if the flag indicates the inverse transform is not to be used during the decoding for the intra-frame prediction residual information for the current block.
A computer system comprising:
- memory configured to receive and store encoded data, from a bitstream, for a frame of video;
- and
- a video decoder, implemented using one or more processors and memory, configured to perform operations to decode the encoded data, wherein the operations include, for a current block of pixel values of the frame:
- determining that the current block is not further split;
- based at least in part on the determination that the current block is not further split, referencing a flag in the bitstream, the flag at least in part indicating whether or not an inverse transform is used during decoding for intra-frame prediction residual information for the current block;
- inverse quantizing residual values for the current block;
- selectively performing an inverse transform on the inverse quantized residual values for the current block, thereby producing the intra-frame prediction residual information, wherein the inverse transform is skipped if the flag indicates the inverse transform is not used during the decoding for the intra-frame prediction residual information for the current block;
- determining intra-frame prediction values for the current block;
- and
- combining the intra-frame prediction residual information and the intra-frame prediction values for the current block.
One or more computer-readable memory or storage devices having stored thereon encoded data, in a bitstream, for a frame of video, wherein the encoded data includes a flag at least in part indicating whether or not an inverse transform is used during decoding for intra-frame prediction residual information for a current block of pixel values of the frame, the encoded data being organized to facilitate decoding by operations that include:
- determining that the current block is not further split;
- based at least in part on the determination that the current block is not further split, referencing the flag;
- inverse quantizing residual values for the current block;
- selectively performing an inverse transform on the inverse quantized residual values for the current block, thereby producing the intra-frame prediction residual information, wherein the inverse transform is skipped if the flag indicates the inverse transform is not used during the decoding for the intra-frame prediction residual information for the current block;
- determining intra-frame prediction values for the current block;
- and
- combining the intra-frame prediction residual information and the intra-frame prediction values for the current block.
Dependencies are inferred from the claim text.