Encoder, decoder, encoding method, and decoding method
View Patent ↗An encoder includes processing circuitry and a memory coupled to the processing circuitry. Using the memory, the processing circuitry is configured to: change values of pixels in a first block and a second block to filter a boundary between the first block and the second block, using clipping such that change amounts of the respective values do not exceed respective thresholds, the pixels in the first block and the second block being arranged along a line across the boundary. The pixels include type one pixels and type two pixels different from the type one pixels. The respective thresholds for the type one pixels in the first block and the second block are selected to be symmetrical or asymmetrical with respect to the boundary based on block sizes of the first block and the second block.
1. A decoder comprising:
processing circuitry; and
a memory coupled to the processing circuitry,
wherein, using the memory, the processing circuitry is configured to:
change values of luma pixels in a first block and a second block to filter a first boundary between the first block and the second block, using clipping such that change amounts of the respective values are within respective luma clip widths, the luma pixels in the first block and the second block being arranged along a first line across the first boundary, and
change values of chroma pixels in a third block and a fourth block to filter a second boundary between the third block and the fourth block, using clipping such that change amounts of the respective values are within respective chroma clip widths, the chroma pixels in the third block and the fourth block being arranged along a second line across the second boundary,
wherein the luma clip widths applied to the luma pixels arranged along the first line are selected to be asymmetrical with respect to the first boundary, and
wherein the chroma clip widths applied to the chroma pixels arranged along the second line are selected to be symmetrical with respect to the second boundary.
2. An encoder comprising:
processing circuitry; and
a memory coupled to the processing circuitry,
wherein, using the memory, the processing circuitry is configured to:
change values of luma pixels in a first block and a second block to filter a first boundary between the first block and the second block, using clipping such that change amounts of the respective values are within respective luma clip widths, the luma pixels in the first block and the second block being arranged along a first line across the first boundary, and
change values of chroma pixels in a third block and a fourth block to filter a second boundary between the third block and the fourth block, using clipping such that change amounts of the respective values are within respective chroma clip widths, the chroma pixels in the third block and the fourth block being arranged along a second line across the second boundary,
wherein the luma clip widths applied to the luma pixels arranged along the first line are selected to be asymmetrical with respect to the first boundary, and
wherein the chroma clip widths applied to the chroma pixels arranged along the second line are selected to be symmetrical with respect to the second boundary.