Image or video coding based on transform skip- and palette coding-related advanced syntax element

Patent metadata

Field	Value
Publication number	US-2026082050-A1
Application number	US-202519401890-A
Country	US
Kind code	A1
Filing date	Nov 26, 2025
Priority date	Oct 5, 2019
Publication date	Mar 19, 2026
Grant date	—

Abstract

According to the disclosure of the present document, dependency conditions can be defined for efficiently parsing/signaling syntax elements having dependency on transform skip- and/or palette coding-related information, and, on the basis of the dependency conditions, whether or not to parse the transform skip- and/or palette coding-related information can be determined. Accordingly, bits that need to be signaled for video/image coding can be reduced, and coding efficiency can be improved.

First claim

What is claimed is:

1 . A decoding apparatus for image decoding, the decoding apparatus comprising:
a memory; and at least one processor connected to the memory, the at least one processor configured to: obtain image information including residual information from a bitstream; derive a residual sample for a current block based on the residual information; and generate a reconstructed sample based on the residual sample, wherein the image information comprises a sequence parameter set (SPS), wherein the SPS comprises transform skip enabled information, palette coding enabled information, and minimum quantization parameter information related to a minimum allowed quantization parameter for a transform skip mode, wherein the SPS comprises block-based delta pulse code modulation (BDPCM) enabled information on whether the BDPCM is enabled based on the transform skip enabled information, wherein it is determined whether the SPS comprises the minimum quantization parameter information, based on at least one of the transform skip enabled information or the palette coding enabled information, wherein 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 minimum quantization parameter information is comprised in the SPS, and wherein based on a condition that both the value of the transform skip enabled information and the value of the palette coding enabled information are 0, the minimum quantization parameter information is not comprised in the SPS, wherein whether to apply a transform to the current block is determined based on the transform skip enabled information, and wherein for the transform skip mode or a palette mode, the residual sample or an escape value is derived based on the minimum quantization parameter information.

2 . An encoding apparatus for image encoding, the encoding apparatus comprising:
a memory; and at least one processor connected to the memory, the at least one processor configured to: derive a residual sample for a current block; generate residual information based on the residual sample; and encode image information including the residual information, wherein the image information comprises a sequence parameter set (SPS), wherein the SPS comprises transform skip enabled information, palette coding enabled information, and minimum quantization parameter information related to a minimum allowed quantization parameter for a transform skip mode, wherein the SPS comprises block-based delta pulse code modulation (BDPCM) enabled information on whether the BDPCM is enabled based on the transform skip enabled information, wherein it is determined whether the SPS comprises the minimum quantization parameter information, based on at least one of the transform skip enabled information or the palette coding enabled information, wherein 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 minimum quantization parameter information is comprised in the SPS, and wherein based on a condition that both the value of the transform skip enabled information and the value of the palette coding enabled information are 0, the minimum quantization parameter information is not comprised in the SPS, wherein whether to apply a transform to the current block is determined based on the transform skip enabled information, and the transform skip mode is applied to the residual sample based on whether to apply the transform.

3 . An apparatus for transmitting data for an image, the apparatus comprising:
at least one processor configured to obtain a bitstream for the image, wherein the bitstream is generated based on deriving a residual sample for a current block, generating residual information based on the residual sample, and generating the bitstream by encoding image information including the residual information, a transmitter configured to transmit the data comprising the bitstream, wherein the image information comprises a sequence parameter set (SPS), wherein the SPS comprises transform skip enabled information, palette coding enabled information, and minimum quantization parameter information related to a minimum allowed quantization parameter for a transform skip mode, wherein the SPS comprises block-based delta pulse code modulation (BDPCM) enabled information on whether the BDPCM is enabled based on the transform skip enabled information, wherein it is determined whether the SPS comprises the minimum quantization parameter information, based on at least one of the transform skip enabled information or the palette coding enabled information, wherein 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 minimum quantization parameter information is comprised in the SPS, and wherein based on a condition that both the value of the transform skip enabled information and the value of the palette coding enabled information are 0, the minimum quantization parameter information is not comprised in the SPS, wherein whether to apply a transform to the current block is determined based on the transform skip enabled information, and the transform skip mode is applied to the residual sample based on whether to apply the transform.

Assignees

• Lg Electronics Inc

Inventors

• Yoo Sunmi
• Choi Jungah
• Choi Jangwon

Classifications

• H04N19/70 Primary

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title

• H04N19/18

  the unit being a set of transform coefficients · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/186

  the unit being a colour or a chrominance component · CPC title

• H04N19/60

  using transform coding · CPC title