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Code rate distribution method and system based on space-time domain just-noticeable distortion and medium

A code rate allocation, space-time domain technology, applied in the field of code rate allocation based on space-time domain just perceivable distortion, can solve the problem of inaccurate code rate allocation results, not taking into account different sensitivities, etc.

Active Publication Date: 2019-07-26
SHANGHAI UNIV
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Problems solved by technology

However, this algorithm does not take into account that the human eye has different sensitivities to different textures in the image, and the result of the bit rate allocation is inaccurate

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  • Code rate distribution method and system based on space-time domain just-noticeable distortion and medium
  • Code rate distribution method and system based on space-time domain just-noticeable distortion and medium
  • Code rate distribution method and system based on space-time domain just-noticeable distortion and medium

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Embodiment Construction

[0168] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0169] A code rate allocation method based on just perceivable distortion in the space-time domain provided according to the present invention includes:

[0170] SJND model building steps: according to the masking degree and brightness contrast in the airspace, establish the SJND just perceptible distortion model in the airspace;

[0171] Pixel SJND value acquisition step: according to the established spatial domain perceptible distortion model, obtain the SJND value of each pixel point p(x, y) on the i...

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Abstract

The invention provides a code rate distribution method and system based on space-time domain just-noticeable distortion and a medium, and the method comprises the steps: an SJND model building step: building a space domain just perceptible distortion model SJND according to the masking degree and brightness contrast in the space domain; obtaining a pixel SJND value: obtaining the SJND value of each pixel point p (x, y) on the image according to the established space domain just perceptible distortion model, namely maximum distortion allowed by each pixel on the space domain; a spatial domain CTU code rate weight distribution step: carrying out weight distribution on the code rate of the spatial domain CTU according to the established spatial domain just perceptible distortion model SJND. According to human visual characteristics, code rate distribution is realized by using the space-time domain just-noticeable distortion model. Firstly, the space domain code rate distribution weight ofeach CTU is obtained by using the space domain SJND, and then the time domain code rate distribution weight is calculated through the time domain TJND model, so that the code rate distribution accuracy is improved, and the subjective quality of a video is greatly improved.

Description

technical field [0001] The present invention relates to the technical field of image / video coding bit rate control, in particular, to a bit rate allocation method, system and medium based on just perceivable distortion in the space-time domain. Background technique [0002] In recent years, with the rapid development of the video industry, a large amount of video data has emerged. If the video data is not compressed, it will not be able to be transmitted and stored. Let's take the high-definition video format as an example, assuming that its resolution is 1920*1080, there are three color components of Y, U, and V, each pixel is represented by 8 bits, and the frame rate is 25Hz. If the video sequence is not compressed, the amount of data transmitted for one frame of image is 1920*1080*3*8≈5.9 (megabytes), and the amount of data transmitted for one second will reach 5.9*25=147.5 (megabytes) . Assuming that the video sequence is 90 minutes long, the amount of data to transmit...

Claims

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Application Information

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IPC IPC(8): H04N19/146H04N19/147H04N19/177H04N19/186
CPCH04N19/146H04N19/147H04N19/177H04N19/186
Inventor 滕国伟徐佳玲
Owner SHANGHAI UNIV
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