Encoding method and apparatus therefor, and decoding method and apparatus therefor
AssigneeSamsung Electronics Co., Ltd.
InventorsHeechul Yang, Minsoo Park
Life of this patent
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Abstract
Provided is an image decoding method including determining a predicted quantization parameter of a current quantization group determined according to at least one of block split information and block size information, determining a difference quantization parameter of the current quantization group, determining a quantization parameter of the current quantization group, based on the predicted quantization parameter and the difference quantization parameter of the current quantization group, and inverse quantizing a current block included in the current quantization group, according to the quantization parameter of the current quantization group.
Claims4
An image decoding method, the method performed by an apparatus and comprising:
- splitting an upper coding block into a plurality of lower coding blocks according to split information;
- determining a current quantization group based on a split value of a current coding block among the plurality of lower coding blocks and a split value of the current quantization group;
- obtaining a quantization parameter of the current quantization group;
- and
- inverse-quantizing transform coefficients in a current transform block in the current coding block using the quantization parameter,
- wherein:
- the split value of the current coding block is increased by 1 if the current coding block is obtained by splitting the upper coding block into two lower coding blocks according to non-quadtree split,
- the split value of the current coding block is increased by 2 if the current coding block is obtained by splitting the upper coding block into four lower coding blocks according to quadtree split, and
- the non-quadtree split includes a binary split.
An image decoding apparatus comprising:
- at least one processor configured to:
- split an upper coding block into a plurality of lower coding blocks according to split information;
- determine a current quantization group based on a split value of a current coding block among the plurality of lower coding blocks and a split value of the current quantization group;
- obtain a quantization parameter of the current quantization group;
- and
- inverse-quantize transform coefficients in a current transform block in the current coding block using the quantization parameter,
- wherein:
- the split value of the current coding block is increased by 1 if the current coding block is obtained by splitting the upper coding block into two lower coding blocks according to non-quadtree split,
- the split value of the current coding block is increased by 2 if the current coding block is obtained by splitting the upper coding block into four lower coding blocks according to quadtree split, and
- the non-quadtree split includes a binary split.
An image encoding method, the method performed by an apparatus and comprising:
- splitting an upper coding block into a plurality of lower coding blocks;
- determining a current quantization group based on a split value of a current coding block among the plurality of lower coding blocks and a split value of the current quantization group;
- obtaining a quantization parameter of the current quantization group;
- and
- quantizing transform coefficients in a current transform block in the current coding block using the quantization parameter,
- wherein:
- the split value of the current coding block is increased by 1 if the current coding block is obtained by splitting the upper coding block into two lower coding blocks according to non-quadtree split,
- the split value of the current coding block is increased by 2 if the current coding block is obtained by splitting the upper coding block into four lower coding blocks according to quadtree split, and
- the non-quadtree split includes a binary split.
Dependencies are inferred from the claim text.