MODE DECISION SIMPLIFICATION FOR INTRA PREDICTION

摘要

In general, techniques are described for reducing the complexity of mode selection when selecting from multiple, different prediction modes. A video coding device comprising a processor may perform the techniques. The processor may compute approximate costs for a pre-defined set of intra-prediction modes identified in a current set. The current set of intra-prediction modes may include fewer modes than a total number of intra-prediction modes. The processor may compare approximate costs computed for one or more most probable intra-prediction modes to a threshold and replace one or more of the intra-prediction modes of the current set with one or more most probable intra-prediction modes. The processor may perform rate distortion analysis with respect to each intra-prediction mode identified in the current set and perform intra-prediction coding with respect to the current block using a mode of the current set.

主权项

1. A method of encoding video data, the method comprising:
computing an approximate cost for each intra-prediction mode identified in a current set of intra-prediction modes that includes a pre-defined set of intra-prediction modes having at least one intra-prediction mode, wherein the current set of intra-prediction modes includes less intra-prediction modes than a total number of intra-prediction modes available for coding a current block of the video data; computing an approximate cost for one or more most probable intra-prediction modes for the current block determined based on intra-prediction modes used to encode one or more neighboring blocks of video data adjacent to the current block; comparing each of the approximate costs computed for the one or more most probable intra-prediction modes to a threshold; replacing one or more of the intra-prediction modes identified in the current set of intra-prediction modes with the one or more most probable intra-prediction modes based on the comparisons; performing a rate distortion analysis with respect to each intra-prediction mode identified in the current set of intra-prediction modes to determine a rate distortion cost for each intra-prediction mode identified in the current set of intra-prediction modes; and performing intra-prediction coding with respect to the current block in accordance with one of the intra-prediction modes identified in the current set of intra-prediction modes based on the determined rate distortion costs to encode the current block.