| 摘要 |
FIELD: information technology. ^ SUBSTANCE: plurality of different transforms are selectively applied to residual blocks based on the prediction mode of the video blocks. At least part of the plurality of transforms is separable directional transforms specifically trained for a corresponding prediction mode to provide better energy compaction for the residual blocks of the given prediction mode. Using separable directional transforms offers the benefits of lower computation complexity and storage requirements than use of non-separable directional transforms. Additionally, a scan order used to scan the coefficients of the residual block may be adjusted when applying separable directional transforms. In particular, the scan order may be adjusted based on statistics associated with one or more previously coded blocks. ^ EFFECT: ensuring effective grouping of non-zero coefficients near the front of the one-dimensional coefficient vector to improve the effectiveness of entropy coding. ^ 49 cl, 8 dwg |
