Method for adjusting code rate by utilizing contrast change

A contrast and bit rate technology, which is applied in the field of adjusting the bit rate by using the contrast change, can solve the problems of reducing the bit rate, affecting the viewing effect, and reducing the encoding image quality, so as to reduce the probability of mosaic occurrence and improve the effect of video viewing.

Inactive Publication Date: 2020-03-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology helps reduce how often things look like on TV screens without being noticeable or causing them looking bad over time by making it easier for people who watch videos see something that they shouldn't even get seen beforehand instead of waiting until sometime later when everything looks good again afterward.

Problems solved by technology

The technical problem addressed in this patented technology relates to improving image display when compressed videos have complicated shapes or are difficult for users to interpret due to their complexity. This can lead to poor visual experiences caused by distortion-like effects such as moiré patterns on displayed images.

Method used

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  • Method for adjusting code rate by utilizing contrast change
  • Method for adjusting code rate by utilizing contrast change
  • Method for adjusting code rate by utilizing contrast change

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Embodiment Construction

[0026] The present invention is a method for adjusting the code rate by using contrast changes. The contrast adjustment is performed in the VPP (video preprocessing) stage before video compression encoding, and the adjustment range is determined according to the size of the output code stream; the contrast adjustment is equivalent to the contrast compression. When the contrast compression , the contrast k is less than 1, reducing the dynamic range of the image; at this time, the brightness b can be adjusted in conjunction, or the highest brightness, the lowest brightness, or the average brightness can be kept unchanged.

[0027] The image brightness contrast transformation formula is:

[0028] y=kx+b

[0029] Among them, x is the input brightness (normalized to 0~1), y is the output brightness (normalized to 0~1), k is the contrast, 0~1 changes; b is the brightness, 0~1 changes; do not During transformation, k=1, b=0, y=x, input is equal to output;

[0030] For the future compr

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Abstract

The invention discloses a method for adjusting a code rate by utilizing contrast change, which comprises the following steps of: adjusting the contrast according to the size of an output code stream in a video preprocessing stage before video compression coding; when the contrast is compressed, the contrast is 0-1, and reducing the dynamic range of the image; and performing linkage brightness adjustment. According to the method, the code rate is reduced, the mosaic occurrence probability is reduced, and the video watching effect is improved.

Description

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Claims

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Application Information

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Owner XI AN JIAOTONG UNIV
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