Method and Apparatus for Sign Coding of Transform Coefficients in Video Coding System
AssigneeMediatek Inc.
InventorShih-Ta HSIANG
Life of this patent
Estimating the term…
Abstract
A video decoding method and apparatus. The method operates by receiving coded transform coefficients corresponding to a residual block of a current block, determining a transform type for the current block, selecting, based on the transform type, one set of dimension constraints from among a plurality of sets of dimension constraints for enabling coefficient sign prediction in the current block, and enabling coefficient sign prediction for the current block only if the width and height of the current block satisfy the selected set of dimension constraints.
Claims9
A video decoding method, the method comprising:
- receiving coded transform coefficients corresponding to a residual block of a current block;
- determining a transform type for the current block;
- selecting, based on the transform type, one set of dimension constraints from among a plurality of sets of dimension constraints for enabling coefficient sign prediction in the current block;
- and
- enabling coefficient sign prediction for the current block only if the width and height of the current block satisfy the selected set of dimension constraints.
A video decoding method, the method comprising:
- receiving coded transform coefficients corresponding to a residual block of a current block, wherein the current block comprises a transform block of size 4×4;
- and
- limiting the maximum allowed number for the set of predicted coefficient signs subject to coefficient sign prediction to be less than or equal to 4 for the transform block of size 4×4.
A video decoding apparatus, the apparatus comprising one or more electronic circuits or processors arranged to:
- receive coded transform coefficients corresponding to a residual block of a current block;
- determine a transform type for the current block;
- select, based on the transform type, one set of dimension constraints from among a plurality of sets of dimension constraints for enabling coefficient sign prediction in the current block;
- and
- enable coefficient sign prediction for the current block only if the width and height of the current block satisfy the selected set of dimension constraints.
Dependencies are inferred from the claim text.