Codeword assignment for intra chroma mode signalling for HEVC
AssigneeSony Corporation
InventorsLina Dong, Wei Liu
Life of this patent
Estimating the term…
Abstract
Intra prediction is used in state-of-the-art video coding standards such as AVC. The intra prediction modes are coded into the bitstream. Luma and chroma components could potentially have different prediction modes. For chroma components, there are 5 different modes defined in AVC: vertical, horizontal, DC, diagonal down right, and “same as luma”. Statistics show that the “same as luma” mode is frequent used, but in AVC, this mode is encoded using more bits than other modes during entropy coding, therefore the coding efficiency is decreased. Accordingly, a modified binarization/codeword assignment for chroma intra mode signaling is able to be utilized for high efficiency video coding (HEVC), the next generation video coding standard.
Claims12
A decoding device, comprising:
- circuitry configured to:
- execute a debinarization process on a same-as-luma intra prediction mode for a chroma component, based on a codeword assignment for an intra prediction of the chroma component, wherein
- the intra prediction of the chroma component is based on a plurality of intra prediction modes for the chroma component,
- the plurality of intra prediction modes for the chroma component includes the same-as-luma intra prediction mode,
- in the same-as-luma intra prediction mode for the chroma component, an intra prediction mode for the chroma component is same as an intra prediction mode for a luma component corresponding to the chroma component,
- the debinarization process is executed on the same-as-luma intra prediction mode such that the same-as-luma intra prediction mode is different from the plurality of intra prediction modes other than the same-as-luma intra prediction mode,
- the same-as-luma intra prediction mode for the chroma component is assigned to a codeword of one bit, and
- the one bit codeword is shorter than a plurality of codewords associated with the plurality of intra prediction modes other than the same-as-luma intra prediction mode.
A decoding method, comprising:
- executing a debinarization process on a same-as-luma intra prediction mode for a chroma component, based on a codeword assignment for an intra prediction of the chroma component, wherein
- the intra prediction of the chroma component is based on a plurality of intra prediction modes for the chroma component,
- the plurality of intra prediction modes for the chroma component includes the same-as-luma intra prediction mode,
- in the same-as-luma intra prediction mode for the chroma component, an intra prediction mode for the chroma component is same as an intra prediction mode for a luma component corresponding to the chroma component,
- the debinarization process is executed on the same-as-luma intra prediction mode such that the same-as-luma intra prediction mode is different from the plurality of intra prediction modes other than the same-as-luma intra prediction mode,
- the same-as-luma intra prediction mode for the chroma component is assigned to a codeword of one bit, and
- the one bit codeword is shorter than a plurality of codewords associated with the plurality of intra prediction modes other than the same-as-luma intra prediction mode.
Dependencies are inferred from the claim text.