Signaling mechanism for transform coefficients in video coding

Abstract

A partial coefficient mode in which only some of the transform coefficients of a block is signaled is provided. When configured to perform encoding operations, a video coder generates a set of prediction residuals for the current block based on a predictor. The video coder transforms the set of prediction residuals into a set of transform coefficients and signals only a predetermined subset of the transform coefficients in the bitstream by omitting remaining transform coefficients outside of the subset. When configured to perform decoding operations, the video coder inverse-transforms a set of transform coefficients into a set of prediction residuals of the current block. Only a predetermined subset of the transform coefficients are parsed from the bitstream and the remaining transform coefficients in the set are set to one or more predefined values. The current block is reconstructed based on the predictor and the prediction residuals from the inverse-transforming.

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