Real-time video image contrast regulation method
A real-time adjustment and video image technology, applied in the field of image processing, can solve the problems of not being able to meet the real-time requirements of video signal processing, unsmooth image contrast, sudden slope changes, etc., to meet real-time requirements, less contrast mutations, smooth images Effect
Active Publication Date: 2013-10-09
四川九洲投资控股集团有限公司
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The existing methods have the following problems: 1. The slope of the fitted polyline of the line segment changes suddenly at its segment, which will cause the adjusted image contrast to be unsmooth; 2. The polyline is composed of three line segments, and the two segment points on it It will bring about two contrast mutations; 3. For a video signal with 25 frames per second, if the output value is directly calculated for each pixel, this will cause excessive system overhead and cannot meet the real-time requirements of video signal processing
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[0022] The technical method of video image contrast real-time adjustment provided by the present invention comprises steps:
[0023] (1) Divide the input original video signal into serial video frames, each frame contains M pixels, and each pixel has L bits;
[0024] (2) Input pixel value for an original pixel point , do normalization processing to get the normalized pixel value ;
[0025] (3) According to the contrast adjustment function , get the normalized pixel value after contrast adjustment ;
[0026] (4) Normalized pixel value after contrast adjustment , through inverse normalization processing, the output pixel value after contrast adjustment is obtained ;
[0027] (5) Return to step (2), traverse the M pixels of the video frame, and obtain the video frame after contrast adjustment.
[0028] The contrast adjustment function in step 3 is ,in The factor is a preset value, and its value range is: .
[0029] Preferably, the input pixel value in the abo...
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The invention relates to the technical field of image processing, and discloses a real-time video image contrast regulation method. The real-time video image contrast regulation method includes the following specific steps: (1) inputted raw video signals are divided into serial video frames, each frame contains M pixels, and each pixel has L bits; (2) the input pixel value of a raw pixel is normalized, so that a normalized pixel value is obtained; (3) according to a contrast regulation function, a contrast-regulated normalized pixel value is obtained; (4) the contrast-regulated normalized pixel value is denormalized, so that a contrast-regulated output pixel value is obtained. The curve of the function S has only one segmenting point, moreover, the segment joint is smooth and gradual, consequently, the sudden change of contrast is less, and thereby the regulated image is more smooth; and because the process of contrast regulation is carried out by table lookup, the system overhead is greatly reduced, and the requirement of video image signal regulation on real-timeness can be more met.
Description
technical field [0001] The invention relates to the field of image processing, in particular to a method for real-time adjustment of video image contrast. Background technique [0002] Image digital processing technology is a technology that digitizes the image and performs various processing. At present, various technologies for image quality processing, such as saturation adjustment, noise reduction processing, contrast adjustment, edge enhancement, etc., can play a great role in improving and enhancing the image quality. The image processing of the video signal needs to process 25 frames of video images per second, which adds real-time requirements to the image processing technology. [0003] The essence of contrast adjustment is to expand (or compress) the original value range of image pixels to another value range, so as to increase (or reduce) the pixel difference, and finally achieve the goal that the human eye can clearly distinguish the image difference. The more ...
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IPC IPC(8): H04N5/20
Inventor 周华阮思恩
Owner 四川九洲投资控股集团有限公司