Intra-frame chroma prediction method, device and equipment and video coding and decoding system

A technology of chrominance prediction and prediction method, which is applied in the field of video coding and can solve the problems of multi-bit rate, cost, low universality of intra-frame chrominance prediction methods, etc.

Active Publication Date: 2019-12-20
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present application provide a method and device for intra-frame chroma prediction, a video codec system, terminal equipment, a video encoder, a video decoder, and a computer-readable storage medium, so as to solve the common problems of existing intra-frame chroma prediction methods. The problem of low adaptability and the need to consume more bit rate

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  • Intra-frame chroma prediction method, device and equipment and video coding and decoding system
  • Intra-frame chroma prediction method, device and equipment and video coding and decoding system
  • Intra-frame chroma prediction method, device and equipment and video coding and decoding system

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Embodiment 1

[0085] See figure 1 , which is a schematic flow diagram of an intra-frame chroma prediction method provided in an embodiment of the present application, and the method may include the following steps:

[0086] Step 101. Obtain encoded or decoded reconstructed luminance components.

[0087] It should be noted that the encoded or decoded and reconstructed luminance components described above can be luminance components corresponding to any color space and any video format, that is, the intra-frame chroma prediction method provided by the embodiment of the present application can be applied to any color space and any video format. video format. For example, the above coded or decoded reconstructed luminance component is the luminance component Y in the YCbCr 4:2:0 format.

[0088] Step 102, down-sampling the encoded or decoded reconstructed luminance component.

[0089] It should be noted that, the above-mentioned down-sampling method may be any down-sampling method in the pri...

Embodiment 2

[0141] The convolutional neural network-based intra-frame chroma prediction scheme provided in the embodiment of the present application can be applied to a video encoding and decoding process. In order to further improve the performance of video encoding and decoding, the rate-distortion cost competition can be carried out between the intra-frame chroma prediction method based on convolutional neural network and the traditional chroma prediction method, and the chroma prediction method with the minimum rate-distortion cost can be selected for video Codec. This embodiment will introduce the chroma encoding process.

[0142] see Figure 6 , which is a schematic flow diagram of a method for intra-frame chroma prediction provided in an embodiment of the present application. The method can be specifically applied to a video encoder, and the method can include the following steps:

[0143] Step 601, encoding the luminance component to obtain a luminance code stream;

[0144] Ste...

Embodiment 3

[0172] After introducing the video encoding process, this embodiment introduces and explains the video decoding process. The video decoding process in this embodiment corresponds to the video encoding process in the second embodiment above.

[0173] see Figure 9 , which is a schematic flow diagram of a method for intra-frame chroma prediction provided in an embodiment of the present application, the method may be applied to a video decoder, and the method may include the following steps:

[0174] Step 901, acquire the code stream output by the video encoder.

[0175] Step 902: Decode the video code stream to obtain decoded and reconstructed luma components, decoded and reconstructed adjacent chroma information, and indication information for determining a chroma prediction mode.

[0176] Specifically, the video decoder receives the video code stream output by the video encoder, and then decodes the code stream to obtain corresponding information. Wherein, the above indicat...

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Abstract

The embodiment of the invention discloses an intra-frame chroma prediction method, device and system, terminal equipment, a video encoder, a video decoder and a computer readable storage medium, and the method comprises the steps: obtaining an encoded or decoded reconstructed brightness component; down-sampling the encoded or decoded reconstructed brightness component; inputting the preset parameters into an image coloring sub-network in a pre-trained chroma prediction convolutional neural network model to obtain chroma components output by the image coloring sub-network; wherein the preset parameter comprises a coded or decoded reconstructed brightness component after down-sampling, or comprises a coded or decoded reconstructed brightness component after down-sampling and a target parameter, and the target parameter comprises at least one of a coding distortion degree and a coded or decoded reconstructed adjacent chroma block; and obtaining a chroma prediction result according to thechroma component. The intra-frame chroma prediction scheme based on the convolutional neural network provided by the embodiment of the invention is relatively high in universality, and the code rate can be saved.

Description

technical field [0001] The present application belongs to the technical field of video coding, and in particular relates to an intra-frame chroma prediction method and device, a video codec system, terminal equipment, a video encoder, a video decoder, and a computer-readable storage medium. Background technique [0002] The video coding process mainly includes modules such as prediction, transform quantization, and entropy coding. Prediction can be divided into intra-frame prediction and inter-frame prediction, and intra-frame prediction can include intra-frame chroma prediction and intra-frame luma prediction. [0003] At present, in the new-generation video coding standard Versatile Video Coding (VVC), in order to eliminate redundant information in the YCbCr color space, the linear correlation between the luminance component and the chrominance component in the coding block is generally used , using the corresponding linear prediction model CCLM (Based Cross-component Line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/11H04N19/132H04N19/184H04N19/186H04N21/2343H04N21/4402
CPCH04N19/186H04N19/132H04N19/184H04N21/4402H04N21/2343H04N19/11
Inventor 朱林卫张云李娜张欢乔宇
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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