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Method for automatically enhancing contrast ratio and chrominance of movie

A technology of contrast and chroma, which is applied in the field of automatic enhancement of contrast and chroma in movies, which can solve the problem of overall reddening of the image and achieve the effect of automatic chroma enhancement.

Active Publication Date: 2012-04-25
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over time, this channel degrades more than the other two, causing the overall image to be grayed out by white light bleeding while also turning red overall

Method used

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  • Method for automatically enhancing contrast ratio and chrominance of movie
  • Method for automatically enhancing contrast ratio and chrominance of movie
  • Method for automatically enhancing contrast ratio and chrominance of movie

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Experimental program
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Embodiment

[0023] The first step, read the same scene in the video frame image sequence , calculate each frame frame Bright channel image of and the dark channel image ； Indicates the tth frame image;

[0024] The bright channel image will be divided into 3 by 3 by 3 blocks , find the maximum value of the three RGB channels of each block, and then find the maximum value from these three values, record which channel it comes from, and assign it to the element at the center position.

[0025] The dark channel is to Divide into blocks of 3 by 3 by 3, find the minimum value of the RGB three channels of each block, and then find the minimum value from these three values, record which channel it comes from, and assign it to the element at the center. t represents the image frame number, is the center pixel position.

[0026] Light and dark channel diagram ， The pixel value at the middle position is expressed as ， :but ， . min( ) ...

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Abstract

The invention discloses a method for automatically enhancing contrast ratio and chrominance of a movie; the method comprises the following steps of: reading a frame image sequence of the same scene in a video, and calculating a bright channel image and a dark channel image of each frame; carrying out column diagram analysis on the dark channel image, judging whether the contrast ratio is needed to enhanced; carrying out source analysis on the bright channel image, and judging whether the chrominance is needed to enhanced; if the contrast ratio is needed to enhanced, carrying out transmissivity estimation through an original image, the bright channel image and the dark channel image; and determining a threshold value of the transmissivity according to the bright channel and the dark channel; and enhancing the contrast ratio and the chrominance. According to the degradation principle of cine films, the method can be used for automatically distinguishing whether the contrast ratio and the chrominance of the movie are needed to be enhanced, and automatically enhancing the contrast ratio and chrominance of images needing to be enhanced.

Description

technical field [0001] The invention relates to a system in the technical field of image and video processing, in particular to a method for automatically enhancing film contrast and chromaticity based on the principle of film degradation. Background technique [0002] Film art is an important embodiment of human culture and a precious wealth of human civilization. We are obliged to do our best to protect and inherit excellent film works. The digitization of films is one of the most important ways of protection. Traditional movies are stored in the form of film, which has strict requirements on the storage environment. As the temperature and humidity of the environment change, the chemical coating on the film will oxidize, resulting in brightness and color distortion, and mildew spots will appear in severe cases. In addition, film films will have scratches and color degradation as the number of playbacks increases. Compared with traditional film films, digital film works...

Claims

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Application Information

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IPC IPC(8): H04N9/64
Inventor 许洪腾杨小康刘婧陈立
Owner SHANGHAI JIAO TONG UNIV
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