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Contrast enhancement method

A technology of contrast and detail comparison, which is applied in the field of image processing, can solve the problems of complex algorithms and large amount of calculation, and achieve the effect of enhancing light and dark contrast, improving contrast, and displaying natural effects

Active Publication Date: 2008-07-02
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
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Problems solved by technology

Although the image enhancement effect of the local adaptive equalization method is obvious, and the image details can also be preserved, the algorithm is relatively complicated, that is, it is necessary to perform sub-window local equalization for each pixel of the image, and the amount of calculation is very large.

Method used

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Embodiment Construction

[0035] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] Referring to FIG. 1 , it illustrates the processing flow of an embodiment of the contrast enhancement method proposed by the present invention. As shown in Figure 1, the following steps are included:

[0037] S100, input an image; that is, as a current image.

[0038] S101, the current image is processed by a degradation model to obtain a degraded image; in one embodiment of the present invention, the degraded image is realized by a Gaussian low-pass filter, that is, the current image obtained by convolving the current image with a Gaussian low-pass filter For low-frequency components, the window size of the Gaussian low-pass filter can be set to 3×3; in addition, the degraded image can also be realized by an average filter, etc., and the present invention is not limited thereto.

[0039] S102. Obtain the high frequency component of the curren...

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Abstract

The invention disclose a method for enhancing contrast, which includes the following steps: whole contrast is adjusted. The step adopts a histogram equalization method which limits maximum slope of obtained grey mapping functions and the method is realized by the following way: pixels with pixel number exceeding a first threshold in each grey scale of the histogram of the current image are uniformly distributed to each grey scale again. By adopting the invention, the processed images can keep an average brightness; bright-dark contrast is enhanced, noise in the images can not be over enhanced; the contrast is effectively promoted and display effect is more natural.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a contrast enhancement method. Background technique [0002] At the receiving end of video signals (such as TV sets, monitors, etc.), due to the influence of various factors such as video collection, processing, transmission, and reception, the video images that people watch often have unsatisfactory visual effects, such as improper lighting conditions, causing image distortion. The full frame is dark or bright, and there are insufficient contrast caused by factors such as insufficient brightness dynamic range or non-linearity. These factors will affect the subjective viewing effect, therefore, enhancing the contrast becomes an important problem to be solved in video processing. [0003] Usually, when people watch TV images, they will pay attention to the overall effect and detail effect of the image at the same time. Correspondingly, contrast enhancement methods in ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/57
Inventor 刘立庄何云鹏赵丹王瑞冰黄振强
Owner HISENSE VISUAL TECH CO LTD
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