Patent ID: 11968395
Assignee: GE VIDEO COMPRESSION, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A decoder for decoding a data stream comprising an encoded video including information related to a plurality of transform coefficients associated with the encoded video, the decoder comprising:
a context adaptive entropy decoder configured for, for a current transform coefficient in a transform coefficient block, entropy decoding, using a processor, a first symbol including a coefficient significance flag based on a context, wherein the context is determined based on an operation involving a first previously decoded transform coefficient;
an extractor configured for, using the processor, extracting a second symbol of the current transform coefficient from the data stream;
a desymbolizer configured for, for the current transform coefficient, mapping the second symbol to a transform coefficient level based on a symbolization parameter, wherein the transform coefficient level is greater than a maximum level associated with the first symbol and the symbolization parameter is determined based on the operation involving a second previously decoded transform coefficient and an information component type including a color component type related to the transform coefficient block; and
a picture decoder configured for applying, using a processor, predictive coding based on a prediction residual signal to reconstruct a block of a picture of the video, wherein the prediction residual signal is associated with the first symbol and the transform coefficient level,
wherein the decoder is configured for determining the first previously decoded transform coefficient based on a relative spatial arrangement of the first previously decoded transform coefficient relative to the current transform coefficient, wherein the spatial arrangement is based on a scan position of the current transform coefficient in the transform coefficient block.