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Coding method and device, decoding method and device

A decoding method and code stream technology, applied in the fields of decoding methods and devices, and encoding methods, can solve problems such as large application limitations, and achieve the effects of expanding application scope, reducing decoding delay, and improving encoding performance.

Active Publication Date: 2021-12-07
HANGZHOU HIKVISION DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it is found in practice that the current ISTS scheme is only applied to intra prediction mode and IBC mode, and its application is relatively limited

Method used

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  • Coding method and device, decoding method and device
  • Coding method and device, decoding method and device
  • Coding method and device, decoding method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] See Figure 5 , is a schematic flow chart of an image processing method provided in the embodiment of the present application. The image processing method can be applied to an encoding end device or a decoding end device, such as Figure 5 As shown, the image processing method may include the following steps:

[0140] Step S500, determine the prediction mode of the current block.

[0141] Step S510, when it is determined that the prediction mode of the current block satisfies one of the following conditions, determine that the current block meets the transform skip mode condition: the prediction mode of the current block is an inter prediction mode, and the prediction mode of the current block is a direct mode.

[0142]In the embodiment of the present application, for the encoding end device, the current image block is an encoding block; for the decoding end device, the current block is a decoding block, which will not be repeated below.

[0143] In the embodiment of ...

Embodiment 2

[0153] As a possible embodiment, the current block satisfies the transform skip mode condition, and may also include:

[0154] The current block satisfies one of the following conditions:

[0155] The current block does not adopt PBT mode;

[0156] The current block is not in SBT mode;

[0157] The current block does not adopt the PBT mode, and does not adopt the SBT mode; or, the current block adopts DCT2 transformation mode for transformation.

[0158] Exemplarily, considering that when the current block adopts the PBT mode, the current block needs to be divided into sub-blocks, and the transformations performed by sub-blocks in different positions are not completely the same; and when the current block adopts the SBT mode, it is necessary to divide the inter-frame residual block Carry out sub-block division, and the residual of one of the sub-blocks is 0 by default, and the residual of the other sub-block is not 0 by default. Therefore, when the current block adopts PBT m...

Embodiment 3

[0167] As a possible embodiment, when the prediction mode of the current block is the direct mode, the current block satisfies the transformation skip mode condition, and may also include:

[0168] The current block does not use the inter prediction filtering mode.

[0169] Exemplarily, considering that when the current block adopts the inter prediction filtering mode, adopting the transform skip mode for the current block will basically not improve the performance of the current block, but will increase the complexity.

[0170] Therefore, when the prediction mode of the current block is the direct mode, whether the current block adopts the inter-prediction filtering mode may also be used as a determination condition of whether the current block satisfies the transform skip mode condition.

[0171] Exemplarily, for the decoding end device, the filtering type of the current block may be determined by parsing the code stream identifier (as shown in Table 3) corresponding to the ...

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Abstract

The invention provides a coding method and device and a decoding method and device. The decoding method comprises the following steps: acquiring a code stream; obtaining an inter-frame conversion skip mode enabling flag bit from the code stream; when the value of the inter-frame transform skip mode enabling flag bit is a first value and the current block satisfies a transform skip mode condition, performing inverse transform skip processing or discrete cosine transform (DCT) 2 inverse transform processing on the current block based on the parity of the number of non-zero transform coefficients of the current block; carrying out inverse quantization processing to obtain a residual coefficient of the current block, wherein the first value is a value representing an enabling inter-frame conversion skip mode; and determining a reconstruction value of the current block based on the prediction value of the current block and the residual coefficient of the current block. The method can improve the coding performance and reduce the decoding time delay.

Description

technical field [0001] The present application relates to video codec technology, and in particular to an encoding method, decoding method and device. Background technique [0002] Complete video coding generally includes operations such as prediction, transformation, quantization, entropy coding, and filtering. Wherein, prediction includes intra-frame prediction and inter-frame prediction. [0003] Transformation refers to converting an image described in the form of pixels in the spatial domain to the transform domain, expressed in the form of transform coefficients. However, most images contain more flat areas and slowly changing areas. Appropriate transformation can convert the scattered distribution of image energy in the spatial domain into a relatively concentrated distribution in the transformed domain, removing the frequency domain correlation between signals. , with the quantization process, the code stream can be effectively compressed. [0004] At present, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/122H04N19/124H04N19/139H04N19/159
CPCH04N19/139H04N19/159H04N19/124H04N19/122H04N19/176H04N19/96H04N19/70H04N19/61H04N19/625H04N19/105
Inventor 曹小强
Owner HANGZHOU HIKVISION DIGITAL TECH