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US 2015/0189280 A1Published application
Multi-level significance maps for encoding and decoding
AssigneeBlackBerry Limited
InventorsNguyen NGUYEN, Tianying JI, Dake HE
Life of this patent
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AssigneeBlackBerry Limited
InventorsNguyen NGUYEN, Tianying JI, Dake HE
Estimating the term…
Methods of encoding and decoding for video data are described in which multi-level significance maps are used in the encoding and decoding processes. The significant-coefficient flags that form the significance map are grouped into contiguous groups, and a significant-coefficient-group flag signifies for each group whether that group contains no non-zero significant-coefficient flags. If there are no non-zero significant-coefficient flags in the group, then the significant-coefficient-group flag is set to zero. The set of significant-coefficient-group flags is encoded in the bitstream. Any significant-coefficient flags that fall within a group that has a significant-coefficient-group flag that is non-zero are encoded in the bitstream, whereas significant-coefficient flags that fall within a group that has a significant-coefficient-group flag that is zero are not encoded in the bitstream.
A method for use in a decoder of a bitstream of encoded data for determining a value of a significant-coefficient flag corresponding to a transform coefficient of a block among one or more non-overlapping blocks within a transform unit, the significant-coefficient flag being a member of a group of significant-coefficient flags corresponding to the block, the group having a significant-coefficient-group flag, the method comprising:
A decoder for decoding a bit stream of encoded data for determining a value of a significant-coefficient flag corresponding to a transform coefficient of a block among one or more non-overlapping blocks within a transform unit, the significant-coefficient flag being a member of a group of significant-coefficient flags corresponding to the block, the group having a significant-coefficient-group flag, the decoder comprising:
A non-transitory processor-readable medium storing processor-executable instructions which, when executed, configures one or more processors to decode a bitstream of encoded data by determining a value of a significant-coefficient flag corresponding to a transform coefficient of a block among one or more non-overlapping blocks within a transform unit, the significant-coefficient flag being a member of a group of significant-coefficient flags corresponding to the block, the group having a significant-coefficient-group flag, wherein the instructions comprise:
Dependencies are inferred from the claim text.