Method and device for carrying out subjective video quality optimization coding on P-frame sequence

Abstract

The invention relates to a method and a device for carrying out subjective video quality optimization coding on a P-frame sequence. The method comprises the following steps: detecting two continuous P frames which are already coded before the current P frame, and judging whether the fluctuations of the code rates of the two continuous P frames are less than a preset threshold value; when the fluctuations of the code rates of the two continuous P frames are less than the preset threshold value, predicating the structure similarity value of the current P frame according to the structure similarity value of the previous P frame of the current P frame; calculating the sum of absolute transformed difference of the current P, and calculating the predication output code rate of the current P according to the sum of absolute transformed difference; calculating the optimal quantization step length of the current P according to the structure similarity value of the current P and the predication output code rate and converting the optimal quantization step length to the optimal quantization parameter, and coding the current P according to the optimal quantization parameter. With the adoption of the method and the device, when the P frame meets code rate fluctuation condition, the optimal quantization parameter for improving a subjective video quality can be obtained in case of no obvious increase of the code rate, thus improving the subjective video quality.

Description

technical field [0001] The present invention relates to the technical field of video coding, and in particular, to a method and device for performing subjective video quality optimization coding on a P frame sequence. Background technique [0002] With the widespread rise of video communication services such as conference TV, network streaming media, and digital TV broadcasting, people have higher and higher requirements for the quality of video images. In order to efficiently transmit video data to meet the service requirements of network video services under the condition of limited channel bandwidth and transmission delay, it is usually necessary to perform rate control on video coding. The so-called bit rate control is to make the bit rate generated by video coding as close to the set target bit rate as possible by setting appropriate encoding parameters under the premise of ensuring the restoration of video quality. [0003] Since there is a phenomenon that the objecti...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: the existing technology does not add subjective quality parameters in the encoding process, so the objective quality evaluation does not match the subjective quality evaluation.

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