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Image Or Video Coding on Basis of Transform Skip - and Palette Coding-related Data
| Content Provider | The Lens |
|---|---|
| Abstract | According to disclosures of the present document, dependency conditions can defined for effectively parsing/signaling syntax elements having dependency to transform skip- and/or palette coding-related data, and, on the basis of the dependency conditions, whether or not to parse the transform skip- and/or palette coding-related data can be determined. As a result, bits necessary to be signaled for video/image coding can be reduced and coding efficiency can be improved. |
| Related Links | https://www.lens.org/images/patent/WO/2021066610/A1/WO_2021_066610_A1.pdf |
| Language | English |
| Publisher Date | 2022-10-06 |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
| Jurisdiction | United States of America |
| Date Applied | 2020-10-05 |
| Applicant | Lg Electronics Inc |
| Application No. | 202017765935 |
| Claim | An image decoding method performed by a decoding apparatus, the method comprising: obtaining image information including prediction mode information and residual information from a bitstream; deriving prediction samples for a current block based on the prediction mode information; deriving residual samples for the current block based on the residual information; and generating reconstructed samples based on the prediction samples and the residual samples, wherein the image information includes transform skip enabled information and palette coding enabled information, wherein information about a maximum transform skip size is included in the image information based on the transform skip enabled information, wherein whether to apply a transform to the current block is determined based on the transform skip enabled information and the information about the maximum transform skip size, and the residual samples are derived based on whether to apply the transform and minimum quantization parameter information, wherein the minimum quantization parameter information is information related to a minimum allowed quantization parameter for a transform skip mode, and wherein based on at least one of the transform skip enabled information or the palette coding enabled information, the minimum quantization parameter information is included in the image information. The image decoding method of claim 1, wherein the image information comprises a sequence parameter set (SPS), and wherein the transform skip enabled information and the palette coding enabled information are obtained from the SPS. The image decoding method of claim 2, wherein the minimum quantization parameter information is included in the SPS based on a condition that a value of the transform skip enabled information is 1, or a value of the palette coding enabled information is 1. The image decoding method of claim 1, wherein the image information comprises a transform unit syntax, wherein the transform unit syntax includes a transform skip flag representing whether to apply the transform to the current block based on a value of the transform skip enabled information being equal to 1, and wherein the transform skip mode is determined to be applied to the current block of which a value of the transform skip flag is 1. The image decoding method of claim 1, wherein the image information comprises a sequence parameter set (SPS), and wherein the information about the maximum transform skip size is included in the SPS based on the transform skip enabled information. The image decoding method of claim 1, wherein the image information comprises a sequence parameter set (SPS), and wherein block-based delta pulse code modulation (BDPCM) enabled information on whether the BDPCM is enabled is included in the SPS based on the transform skip enabled information. The image decoding method of claim 6, wherein the image information comprises a coding unit syntax, and wherein the coding unit syntax includes a BDPCM flag representing whether to apply the BDPCM to the current block based on a value of the BDPCM enabled information being equal to 1. The image decoding method of claim 4, wherein the deriving the residual sample comprises: deriving quantized transform coefficients for the current block based on the residual information; deriving a quantization parameter for the current block based on the minimum quantization parameter information with respect to the current block of which the value of the transform skip flag is 1; deriving transform coefficients by performing a dequantization process for the quantized transform coefficients based on the quantization parameter; and deriving the residual sample based on the transform coefficients. An image encoding method performed by an encoding apparatus, the method comprising: deriving prediction samples for a current block based on prediction mode information; deriving residual samples based on the prediction samples; generating residual information based on the residual samples; and encoding image information including the prediction mode information and the residual information, wherein the image information includes transform skip enabled information and palette coding enabled information, wherein information about a maximum transform skip size is included in the image information based on the transform skip enabled information, wherein whether to apply a transform to the current block is determined based on the transform skip enabled information and the information about the maximum transform skip size, and the residual information is generated based on whether to apply the transform, wherein based on at least one of the transform skip enabled information or the palette coding enabled information, minimum quantization parameter information is included in the image information, and wherein the minimum quantization parameter information is information related to a minimum allowed quantization parameter for a transform skip mode. The image encoding method of claim 9, wherein the image information comprises a sequence parameter set (SPS), and wherein the transform skip enabled information and the palette coding enabled information are signaled in the SPS. The image encoding method of claim 10, wherein the minimum quantization parameter information is included in the SPS based on a condition that a value of the transform skip enabled information is 1, or a value of the palette coding enabled information is 1. The image encoding method of claim 9, wherein the image information comprises a transform unit syntax, wherein the transform unit syntax includes a transform skip flag representing whether to apply the transform to the current block based on a value of the transform skip enabled information being equal to 1, and wherein the transform skip mode is determined to be applied to the current block of which a value of the transform skip flag is 1. The image encoding method of claim 9, wherein the image information comprises a sequence parameter set (SPS), and wherein the information about the maximum transform skip size is included in the SPS based on the transform skip enabled information. The image encoding method of claim 9, wherein the image information comprises a sequence parameter set (SPS), and wherein block-based delta pulse code modulation (BDPCM) enabled information on whether the BDPCM is enabled is included in the SPS based on the transform skip enabled information. The image encoding method of claim 14, wherein the image information comprises a coding unit syntax, and wherein the coding unit syntax includes a BDPCM flag representing whether to apply the BDPCM to the current block based on a value of the BDPCM enabled information being equal to 1. The image encoding method of claim 12, wherein the generating the residual information comprises: generating the residual information by applying the transform skip mode to the residual samples for the current block of which the value of the transform skip flag is 1. (canceled) A non-transitory computer readable storage medium storing a bitstream generated by a method, the method comprising: performing deriving prediction samples for a current block based on prediction mode information, deriving residual samples based on the prediction samples, generating residual information based on the residual samples, and generating the bitstream by encoding image information including the prediction mode information and the residual information, wherein the image information includes transform skip enabled information and palette coding enabled information, wherein information about a maximum transform skip size is included in the image information based on the transform skip enabled information, wherein whether to apply a transform to the current block is determined based on the transform skip enabled information and the information about the maximum transform skip size, and the residual information is generated based on whether to apply the transform, wherein based on at least one of the transform skip enabled information or the palette coding enabled information, minimum quantization parameter information is included in the image information, and wherein the minimum quantization parameter information is information related to a minimum allowed quantization parameter for a transform skip mode. |
| CPC Classification | PICTORIAL COMMUNICATION; e.g. TELEVISION |
| Extended Family | 027-004-126-597-235 012-004-407-054-283 009-402-830-129-671 142-453-775-858-426 062-862-339-080-977 086-951-793-468-23X 156-599-761-480-389 035-185-820-110-357 |
| Patent ID | 20220321887 |
| Inventor/Author | Yoo Sunmi Choi Jungah Choi Jangwon |
| IPC | H04N19/132 H04N19/176 H04N19/18 H04N19/46 H04N19/70 |
| Status | Pending |
| Owner | Lg Electronics Inc |
| Simple Family | 027-004-126-597-235 009-402-830-129-671 012-004-407-054-283 142-453-775-858-426 062-862-339-080-977 086-951-793-468-23X 156-599-761-480-389 035-185-820-110-357 |
| CPC (with Group) | H04N19/70 H04N19/46 H04N19/176 H04N19/18 H04N19/124 H04N19/13 H04N19/60 H04N19/132 H04N19/122 H04N19/137 H04N19/11 H04N19/593 H04N19/625 |
| Issuing Authority | World Intellectual Property Organization (WIPO) |
| Kind | Patent Application Publication |
