CLHAE image enhancement method based on gray level compression

An image enhancement and grayscale technology, applied in the field of image processing, can solve the problems of not improving the ratio, unable to obtain a clear and satisfactory image enhancement effect, and image whitening, etc., to achieve enhanced contrast, fast and efficient image enhancement effect, The effect of reducing storage space

Inactive Publication Date: 2018-11-20
CHENGDU LIGHT COLLECTOR TECH
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Problems solved by technology

For the whole image, the gray level of the image has been expanded, but for the original image with a "uniform" gray level distribution, the brightness of the image processed by these methods is relatively sm

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  • CLHAE image enhancement method based on gray level compression
  • CLHAE image enhancement method based on gray level compression
  • CLHAE image enhancement method based on gray level compression

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Embodiment Construction

[0029] The present invention converts the original image in RGB space to YUV space, and compresses the gray level of the brightness space Y (Y space), and uses the CLAHE (Contrast Limited Adaptive HistogramEqualization, limited contrast adaptive histogram equalization) algorithm for low Contrast images are used for image enhancement processing, so as to achieve efficient and fast image enhancement effects.

[0030] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] It should be noted that the following specific embodiments are only for clearly explaining the present invention, therefore, it should be avoided to be interpreted as a limitation of the present invention.

[0032] In the following specific embodiments of the present invention, please refer to figure 1 , figure 1 It is a flowchart of a CLHAE image enhancement method based on grayscale compression in the present inventio...

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Abstract

The invention discloses a CLHAE image enhancement method based on gray level compression. The method comprises: converting a current RGB color space image into a YUV color space image, and extractingeach initial pixel value of image brightness Y; performing uniform and non-overlapping partitioning, gray level compression, histogram statistics, contrast limitation, and histogram equalization on the image brightness Y, to obtain a gray level mapping table of each block; performing bilinear interpolation algorithm calculation on the image brightness Y, to obtain each adjusted pixel value of theimage brightness Y; calculating a color conversion ratio between each initial pixel value of the image brightness Y and the adjusted pixel value, and applying to the current RGB color space image, tooutput a new RGB color space image. The method can improve processing efficiency, expand a dynamic range of an image and enhance contrast of the image on the basis of keeping the color ratio of an original image, thereby realizing fast and efficient image enhancement effect.

Description

technical field [0001] The present invention relates to the technical field of image processing, and more specifically, to a CLHAE (Contrast Limited Adaptive Histogram Equalization, Contrast Limited Adaptive Histogram Equalization) image enhancement method with color preservation and grayscale compression. Background technique [0002] With the development of society, automobiles are becoming more and more indispensable in daily life as a means of transportation, and corresponding vehicle-mounted products are also emerging, among which the vehicle-mounted image products are the most prominent. In practical applications, images collected by vehicle-mounted products often have low contrast and low definition due to equipment, ambient brightness, image compression methods, etc., which is not conducive to subsequent processing. In order to improve these defects, it is necessary to perform image enhancement on such images. [0003] Traditional image enhancement methods are divid...

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Application Information

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IPC IPC(8): G06T5/00G06T5/40G06T3/40
CPCG06T3/4007G06T5/007G06T5/40G06T2207/10004G06T2207/10024
Inventor 李想宋博
Owner CHENGDU LIGHT COLLECTOR TECH
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