DC Only Transform Coefficient Mode For Image And Video Coding
AssigneeGoogle Inc.
InventorsCheng Chen, Bohan Li, Debargha Mukherjee, Jingning Han, Yaowu Xu
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Abstract
A DC only transform coefficient mode is described. A decoder can receive an encoded bitstream including an encoded transform block corresponding to a block and determine, from the encoded bitstream, whether the encoded transform block was encoded using a DC only transform coefficient mode. Responsive to a determination that the encoded transform block was encoded using the DC only transform coefficient mode, only a DC transform coefficient of the encoded transform block from the encoded bitstream is decoded to reconstruct the block. Any other block positions are filled with a zero value.
Claims17
An apparatus for decoding a block, comprising:
- a processor configured to:
- receive an encoded bitstream including an encoded transform block corresponding to the block;
- determine, from the encoded bitstream, whether the encoded transform block was encoded using a DC only transform coefficient mode;
- and
- responsive to a determination that the encoded transform block was encoded using the DC only transform coefficient mode, decode only a DC transform coefficient of the encoded transform block from the encoded bitstream to reconstruct the block.
A method for decoding a block, comprising:
- receiving an encoded bitstream including an encoded block corresponding to the block;
- determining, from the encoded bitstream, that the encoded block was encoded using a DC only transform coefficient mode;
- and
- responsive to the determining, decoding only a DC transform coefficient of the encoded block from the encoded bitstream to reconstruct the block.
An apparatus for encoding a block, comprising:
- a processor configured to:
- determine whether, of transform coefficients of the block, only a DC transform coefficient has a non-zero value;
- encode, into an encoded bitstream, a symbol identifying whether a DC only transform coefficient mode is used, a value of the symbol responsive to a determination of whether only the DC transform coefficient has the non-zero value;
- and
- encode the block into the encoded bitstream according to the determination.
(canceled)
Dependencies are inferred from the claim text.