Repositioning of prediction residual blocks in video coding

摘要

Techniques are described for coding residual data of a prediction residual block in either a lossy or lossless coding mode, in which a transform is skipped or bypassed. The techniques of this disclosure include determining whether to reposition, e.g., rotate or flip, residual data of a residual block prior to coding the residual data of the residual block. For both the lossy and lossless coding modes, a video coding device determines whether to reposition residual data of a residual block based on a prediction mode of the residual block and a size of the residual block. In some examples, the techniques disable repositioning for all residual blocks in the inter-prediction mode and the intra block copying prediction mode, and determine to reposition residual blocks in the intra-prediction mode when the residual blocks have block sizes that are less than or equal to a threshold size.

主权项

1. A method of decoding video data, the method comprising:
decoding, from a bitstream, residual data of a residual block, the residual block being coded in a transform skip mode such that the residual block is not converted from a pixel domain to a frequency domain; determining, based on a prediction mode of the residual block and a size of the residual block, whether to reposition residual data of the residual block prior to reconstructing a video block of the video data from the residual data of the residual block, wherein repositioning the residual data comprises one of rotating or flipping the residual data of the residual block, wherein, based on the prediction mode of the residual block being an intra prediction mode and the size of the residual block being less than or equal to a threshold size, a determination is made to reposition the residual data of the residual block, and wherein, based on the prediction mode of the residual block being the intra prediction mode and the size of the residual block being greater than the threshold size, a determination is made to disable repositioning of the residual data of the residual block; and reconstructing the video block of the video data from the residual data after determining whether to reposition the residual data.