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Method and system for calculating encoding distortion degree and encoding mode control

A coding distortion and coding technology, applied in the field of video coding and processing, can solve the problems of complex operation logic and data calculation path delay, and achieve the effect of shortening the delay, improving the accuracy, and reducing the memory synchronization buffer space.

Active Publication Date: 2019-04-02
HANGZHOU HIKVISION DIGITAL TECH +1
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Problems solved by technology

The calculation process based on SSD will bring the reality of complex operation logic and serious data calculation path delay. At present, mainstream encoders have given up the RDO strategy that significantly improves the encoding performance, and generally adopt the SAD / SATD mode selection

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  • Method and system for calculating encoding distortion degree and encoding mode control
  • Method and system for calculating encoding distortion degree and encoding mode control
  • Method and system for calculating encoding distortion degree and encoding mode control

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Embodiment Construction

[0036] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0038] The first embodiment of the present invention relates to a method for calculating a coding distortion degree, figure 1 is a schematic flowchart of the method for calculating the encoding distortion degree.

[0039] Specifically, as figure 1 As shown, the method for calculating the encoding distortion degree is preset with a coefficient ma...

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Abstract

The invention, which relates to the video coding and processing field, discloses methods and systems for calculating a coding distortion degree and coding mode control. The method for calculating a coding distortion degree: according to a pixel value of a coding macro block and a predicted pixel value in a current prediction mode, a predicted residual value is calculated, and a DCT coefficient X that is outputted after discrete cosine transformer on the a predicted residual value is obtained; a frequency domain coefficient Y that is outputted after quantization and inverse quantization on the X is obtained; residual calculation is carried out on a frequency domain coefficient that is obtained after preset coefficient matrix Ef adjustment on the DCT coefficient X and the frequency domain coefficient Y; and inverse discrete cosine transform is carried out on residual calculation results to obtain a coding distortion degree in a current prediction mode. According to the invention, the pixel residual calculation in a space domain is converted into frequency domain coefficient residual calculation; and coding distortion degree calculation can be completed only based on the frequency domain data residual relation. Therefore, the delay of a residual gauge and the synchronous buffer space of the internal memory are reduced; and the hardware realization becomes convenient.

Description

technical field [0001] The invention relates to the field of video encoding and processing, in particular to a method and system for calculating encoding distortion degree and encoding mode control. Background technique [0002] In the conference document of JVT (Joint Video Team), it is proposed to adopt the rate-distortion coding mode control model based on Lagrangian optimization algorithm to realize the mode control strategy of video coding, considering the set of K source sample values ​​S=(S 1 ,...,S K ), macroblock S k The Lagrangian cost function is as follows: [0003] J MODE (S k , I k |Q,λ MODE ) = D REC (S k , I k |Q)+λ MODE × R REC (S k , I k |Q,λ MODE ) [0004] Among them, I k is the coding mode of the corresponding macroblock, Q is the quantization parameter, λ MODE is the Lagrangian parameter. D. REC is the encoding distortion, R REC is the code rate of the coded stream. [0005] Distortion D REC There are two calculation methods for th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/147H04N19/103H04N19/625
Inventor 章旭东张磊林洪周黄畅钱学锋徐宁
Owner HANGZHOU HIKVISION DIGITAL TECH