Method for dynamically increasing video image effect of vision

A video image and visual effect technology, applied in image communication, color TV parts, TV system parts and other directions, can solve the problem of flicker in algorithm expression, and achieve the goal of solving flicker, improving visual effect, and improving image contrast. Effect

Inactive Publication Date: 2006-03-08
CENT ACADEME OF SVA GROUP
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Problems solved by technology

Different methods are applied in different occasions. If there is a continuous transition scene (both dark scene and bright scene), it is poss

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  • Method for dynamically increasing video image effect of vision
  • Method for dynamically increasing video image effect of vision
  • Method for dynamically increasing video image effect of vision

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[0037] Such as figure 1 with Image 6 As shown, the present invention provides a method for dynamically improving the visual effect of video images, by setting inflection points in different situations to obtain different mapping functions to improve image contrast, which includes the following steps:

[0038] Step 1. Read in the entire image, calculate the luminance map of the video image, and obtain the luminance information function f(i, j) representing the pixel point in the i-th row and j-column of the image, the luminance average value M of the entire image, and the minimum luminance Value Min and maximum brightness Max;

[0039] Step 2. Determine whether the image belongs to the situation of uneven brightness distribution:

[0040] Step 2.1. Divide the image into four blocks of 2×2, obtain the average brightness value of each small block image respectively, and take the maximum average value M among them max and the minimum mean M min ;

[0041] Step 2.2, by combin...

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Abstract

The method includes following steps: first, calculating brightness chart for video image, next, determining whether it belongs to case of uneven distribution of brightness; then, based on different distribution of brightness, setting up different inflection points so as to obtain different curves of mapping function; finally, carrying out mapping transformation for original brightness chart so as to obtain brightness chart with contrast being enhanced. Operation of segmented linear expansion is adopted in the method to stretch segmented gray scale interval selectively. Thus, curve is changed smoothly; quality of image is improved; and unexpected flicker will not occur in scene with brightness changed gradually.

Description

technical field [0001] The invention relates to a method for dynamically improving the visual effect of video images. Background technique [0002] Because the grayscale variation range of the actually captured video image is often smaller than the maximum allowable grayscale variation range of the image display system, the image is dark or bright, the contrast is insufficient, and the visual effect is not ideal. The main purpose of contrast expansion is to increase the range of grayscale changes in the image, enrich the grayscale levels of the image, and improve the visual perception effect. Contrast Stretching is a powerful way to enhance video images. [0003] The existing image contrast extension algorithm, black extension algorithm and brightness equalization algorithm are three different algorithms, usually for different video scenes, using three different processing methods: black extension is in darker scenes , properly increase the brightness of the image to make ...

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Application Information

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IPC IPC(8): H04N5/57
Inventor 袁野侯钢王国中
Owner CENT ACADEME OF SVA GROUP
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