Image encoding method, image decoding method, encoding device, and decoding device

Patent metadata

Field	Value
Publication number	US-10609389-B2
Application number	US-201715836827-A
Country	US
Kind code	B2
Filing date	Dec 9, 2017
Priority date	Jun 9, 2015
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

Embodiments of the present disclosure provide an image encoding method, an image decoding method, an encoding device, and a decoding device. The method includes: determining a conversion function parameter of a current image block; determining a conversion function parameter of a neighboring image block corresponding to the current image block; determining, according to a correlation between the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, whether to perform merge encoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, and determining a first indicator, where the first indicator is used to indicate whether to perform merge encoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block; and encoding the first indicator.

First claim

What is claimed is:

1. An image decoding method, wherein the method comprises:
obtaining a first indicator from a bitstream, wherein the first indicator indicates whether to perform combined decoding on a conversion function parameter of a current image block and a conversion function parameter of a neighboring image block, and wherein the conversion function is a function that is used for nonlinear conversion or tone-mapping; and
obtaining the conversion function parameter of the current image block according to the first indicator.

2. The method according to claim 1 , wherein the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block each includes M parameters, M being a positive integer greater than or equal to 1; or
the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block each is an index value of a conversion function.

3. The method according to claim 1 , wherein obtaining the conversion function parameter of the current image block according to the first indicator comprises:
when it is determined that the first indicator instructs to perform combined decoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, determining that the conversion function parameter of the current image block is the same as the conversion function parameter of the neighboring image block.

4. The method according to claim 2 , wherein when each of the conversion function parameters includes the M parameters, the obtaining the conversion function parameter of the current image block according to the first indicator comprises:
when it is determined that the first indicator is configured for instructing to perform combined decoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, obtaining M decoding flag bits, wherein the M decoding flag bits correspond one-to-one to the M parameters, wherein an m th decoding flag bit in the M decoding flag bits indicates whether an m th parameter in the conversion function parameter of the current image block is the same as an m th parameter in the conversion function parameter of the neighboring image block, m being an integer between 1 and M;
determining, according to the M decoding flag bits, a parameter in the conversion function parameter of the current image block and a corresponding parameter in the conversion function parameter of the neighboring image block that are the same;
obtaining second decoding information, wherein the second decoding information is decoding information for decoding a parameter in the conversion function parameter of the current image block and a corresponding parameter in the conversion function parameter of the neighboring image block that are different from each other; and
decoding the second decoding information according to the M decoding flag bits, to determine the parameter in the conversion function parameter of the current image block and the corresponding parameter in the conversion function parameter of the neighboring image block that are different from each other, wherein the conversion function parameter of the current image block comprises the parameter in the conversion function parameter of the current image block that is the same as the corresponding parameter in the conversion function parameter of the neighboring image block, and a parameter in the conversion function parameter of the current image block that is different from the corresponding parameter in the conversion function parameter of the neighboring image block.

5. The method according to claim 2 , wherein when each of the conversion function parameters includes the M parameters, the obtaining the conversion function parameter of the current image block according to the first indicator comprises:
when it is determined that the first indicator is configured for instructing to perform combined decoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, obtaining M decoding flag bits, wherein the M decoding flag bits correspond one-to-one to the M parameters, wherein an m th decoding flag bit in the M decoding flag bits indicates whether an m th parameter in the conversion function parameter of the current image block is the same as an m th parameter in the conversion function parameter of the neighboring image block, m being an integer between 1 and M; and
determining, according to the M decoding flag bits, a parameter in the conversion function parameter of the current image block and a corresponding parameter in the conversion function parameter of the neighboring image block that are the same, wherein the M parameters in the conversion function parameter of the current image block are the same as the M parameters in the conversion function parameter of the neighboring image block.

6. The method according to claim 1 , wherein the obtaining the conversion function parameter of the current image block according to the first indicator comprises:
when it is determined that the first indicator is configured for instructing not to perform combined decoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, obtaining first decoding information, wherein the first decoding information is decoding information for decoding the conversion function parameter of the current image block; and
decoding the first decoding information to obtain the conversion function parameter of the current image block.

7. The method according to claim 1 , wherein before the obtaining the conversion function parameter of the current image block according to the first indicator, the method further comprises:
obtaining a second indicator; and
determining the neighboring image block according to the second indicator.

8. An encoding device, wherein the device comprises:
a processor and a memory coupled to the processor; and
the processor is configured to:
determine a conversion function parameter of a current image block, wherein
determine a conversion function parameter of a neighboring image block corresponding to the current image block, wherein the conversion function is a function that is used for nonlinear conversion or tone-mapping; and
determine, according to a correlation between the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, whether to perform merge encoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block, and determine a first indicator, wherein the first indicator indicates whether to perform merge encoding on the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block; and
encode the first indicator.

9. The device according to claim 8 , wherein the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block each includes M parameters, M being a positive integer greater than or equal to 1; or
the conversion function parameter of the current image block and the conversion function parameter of the neighboring image block each is an index value of a conversion function.

10. The device according to claim 8 , wherein the processor is configured to:
if determining that all parameters in the conversion function parameter of the curr

Assignees

• Huawei Tech Co Ltd

Inventors

• Zheng Xiaozhen
• Zheng Jianhua
• Chen Hai
• Li Meng

Classifications

• H04N19/167

  Position within a video image, e.g. region of interest [ROI] · CPC title

• H04N19/176 Primary

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

• H04N19/463

  by compressing encoding parameters before transmission · CPC title

• H04N19/136

  Incoming video signal characteristics or properties · CPC title

• H04N19/46

  Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) · CPC title