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AssigneeBlackBerry Limited
InventorsDake HE, Tianying JI, Jing WANG, Xiaofeng WANG
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Methods and devices for encoding and decoding video are described that partition transform blocks into coefficient groups. The coefficients within non-zero coefficients are run-length coded in a reverse scan order within the group. Prior to coefficient coding, data is encoded indicating which coefficient group in group scan order is the last to contain a non-zero coefficient. Then data is encoded indicating the position within that last non-zero coefficient group of the last non-zero coefficient in scan order inside the coefficient group. Thus the decoder is able to decode run-length data knowing the positions of the coefficients and eliminating the need for end-of-block flags.
A method of decoding video from a bitstream of encoded video using a video decoder, the video including a picture partitioned into blocks, residual data for the blocks being spectrally transformed into transform blocks, each transform block being further partitioned into coefficient groups, the method comprising:
A method of encoding video using a video encoder, the video including a picture partitioned into blocks, residual data for the blocks being spectrally transformed into transform blocks, each transform block being further partitioned into coefficient groups, the method comprising:
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