Signaling of quantization information in non-quadtree-only partitioned video coding
US-2018020241-A1 · Jan 18, 2018 · US
Method and apparatus for encoding/decoding image using quantization parameter, and recording medium storing bitstream
US12574514B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12574514-B2 |
| Application number | US-202418674728-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 24, 2024 |
| Priority date | Jun 25, 2018 |
| Publication date | Mar 10, 2026 |
| Grant date | Mar 10, 2026 |
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Abstract
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There is provided an image encoding/decoding method and apparatus. The image decoding method comprises decoding size information of a quantization group from a bitstream, acquiring a delta quantization parameter of a current block on the basis of the size information of the quantization group, and deriving a quantization parameter for the current block on the basis of the delta quantization parameter.
First claim
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The invention claimed is: 1 . An image decoding method comprising: decoding subdivision information of quantization group from a bitstream, the subdivision information indicating a maximum subdivision value of the quantization group; in response to a subdivision value of a current block being equal to or smaller than the maximum subdivision value of the quantization group, setting quantization parameter coding information to a first value, the quantization parameter coding information indicating whether a quantization parameter is coded; in response to the quantization parameter coding information being set to the first value, acquiring a delta quantization parameter of the current block, deriving a quantization parameter of the current block based on the delta quantization parameter, and setting the quantization parameter coding information to a second value; and obtaining transform coefficients of the current block based on the quantization parameter of the current block, wherein the subdivision value is related to a ratio of areas between the current block and a coding tree block. 2 . An image encoding method comprising: determining a maximum subdivision value of quantization group; determining a quantization parameter of a current block; quantizing transform coefficients of the current block based on the quantization parameter of the current block; in response to a subdivision value of the current block being equal to or smaller than the maximum subdivision value of the quantization group, setting quantization parameter coding information to a first value, the quantization parameter coding information indicating whether a quantization parameter is coded; in response to the quantization parameter coding information indicating the first value, encoding a delta quantization parameter of the current block and setting the quantization parameter coding information to a second value; and encoding subdivision information of the quantization group indicating the maximum subdivision value of the quantization group, wherein the subdivision value is related to a ratio of areas between the current block and a coding tree block. 3 . A computer-readable non-transitory recording medium storing image data that is decoded by an image decoding method, wherein the image data contains subdivision information of quantization group indicating a maximum subdivision value of the quantization group and a delta quantization parameter of a current block, and wherein the image decoding method comprises: in response to a subdivision value of the current block being equal to or smaller than the maximum subdivision value of the quantization group, setting quantization parameter coding information to a first value, the quantization parameter coding information indicating whether a quantization parameter is coded; in response to the quantization parameter coding information indicating the first value, acquiring the delta quantization parameter of the current block, deriving a quantization parameter of the current block based on the delta quantization parameter, and setting the quantization parameter coding information to a second value; and obtaining transform coefficients of the current block based on the quantization parameter of the current block, wherein the subdivision value is related to a ratio of areas between the current block and a coding tree block.
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the region being a block, e.g. a macroblock · CPC title
Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks · CPC title
the unit being a set of transform coefficients · CPC title
according to rate distortion criteria (rate-distortion as a criterion for motion estimation H04N19/567) · CPC title
- H04N19/124Primary
Quantisation · CPC title
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- What does patent US12574514B2 cover?
- There is provided an image encoding/decoding method and apparatus. The image decoding method comprises decoding size information of a quantization group from a bitstream, acquiring a delta quantization parameter of a current block on the basis of the size information of the quantization group, and deriving a quantization parameter for the current block on the basis of the delta quantization par…
- Who is the assignee on this patent?
- Electronics & Telecommunications Res Inst, Univ Sejong Ind Acad Coop Foud, Iucf Korea Aerospace Univ
- What technology area does this patent fall under?
- Primary CPC classification H04N19/124. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 10 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).