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US 11,109,031 B2Granted
Decoder, encoder, decoding method, and encoding method
AssigneePanasonic Intellectual Property Corporation of America
InventorsTakahiro Nishi, Tadamasa Toma
Life of this patent
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Abstract
An image decoder includes: a processor; and a memory. Using the memory, the processor obtains motion vectors of sub-blocks obtained by splitting a current frame; determines, for each of processing blocks obtained by splitting the current frame, quantization control to be performed on the processing block; and inversely quantizes each of the processing blocks by the quantization control determined for the processing block.
Claims8
A decoder, comprising:
- a processor;
- and
- a memory, wherein
- using the memory, the processor:
- for each of a plurality of sub-blocks obtained by splitting a current frame, obtains multiple motion vectors for the sub-block;
- for each of a plurality of processing blocks obtained by splitting each of the sub-blocks, selects a motion vector for the processing block from among the multiple motion vectors obtained for the sub-block from which the processing block is obtained;
- and
- for each of a plurality of determination blocks including at least four of the processing blocks,
- determines quantization control to be performed on the determination block by determining whether at least two of the at least four processing blocks included in the determination block have different motion vectors so as to determine whether the determination block is located in a boundary region between a foreground and a background in the current frame and (ii) determines the quantization control for the determination block according to whether the determination block is located in the boundary region, and
- inversely quantizes the determination block by the quantization control determined for the determination block.
7 more elements
A decoding method, comprising:
- for each of a plurality of sub-blocks obtained by splitting a current frame, obtaining multiple motion vectors for the sub-block;
- for each of a plurality of processing blocks obtained by splitting each of the sub-blocks, selecting a motion vector for the processing block from among the multiple motion vectors obtained for the sub-block from which the processing block is obtained;
- and
- for each of a plurality of determination blocks including at least four of the processing blocks,
- determining quantization control to be performed on the determination block by determining whether at least two of the processing blocks included in the determination block have different motion vectors so as to determine whether the determination block is located in a boundary region between a foreground and a background in the current frame and (ii) determines the quantization control for the determination block according to whether the determination block is located in the boundary region, and
- inversely quantizing the determination block by the quantization control determined for the determination block.
3 more elements
A decoder, comprising:
- a processor;
- and
- a memory, wherein
- using the memory, the processor:
- for each of a plurality of sub-blocks obtained by splitting a current frame, obtains multiple motion vectors for the sub-block;
- for each of a plurality of processing blocks obtained by splitting each of the sub-blocks, selects a motion vector for the processing block from among the multiple motion vectors obtained for the sub-block from which the processing block is obtained;
- and
- for each of a plurality of determination blocks including at least two of the processing blocks,
- determines quantization control to be performed on the determination block by determining whether the at least two of the processing blocks included in the determination block have different motion vectors so as to determine whether the determination block is located in a boundary region between a foreground and a background in the current frame and (ii) determines the quantization control for the determination block according to whether the determination block is located in the boundary region, and
- inversely quantizes the determination block by the quantization control determined for the determination block,
- a quantization width of a first quantization block included in the boundary region is set to a width greater than a quantization width of a second determination block not included in the boundary region.
8 more elements
Dependencies are inferred from the claim text.