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Grayscale conversion based adaptive contrast enhancement algorithm

A technology of grayscale transformation and enhancement algorithm, which is applied in the field of image processing, can solve the problems of noise amplification, complex calculation, insufficient enhancement of local image effects, etc., and achieve the effect of simple algorithm, high processing efficiency and bright colors

Active Publication Date: 2016-07-06
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to propose an adaptive contrast enhancement algorithm based on gray scale transformation, which is suitable for adaptive enhancement of gray The contrast of high-resolution images and color images enhances the image contrast, makes it clearer, and makes the tone more vivid, effectively improving the visual effect of the image

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[0043] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0044] The invention provides an adaptive contrast enhancement algorithm based on grayscale transformation, which is used for contrast enhancement of grayscale images and color images to improve visual effects. Take an 8-bit image (with a grayscale range of 0 to 255) as an example, such as figure 1 As shown, its specific implementation steps are as follows:

[0045] Step 1: The adaptive selection of the threshold is realized by establishing the functional relationship between the contrast enhancement threshold and the dynamic range of the gray scale of...

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Abstract

The present invention discloses a grayscale conversion based adaptive contrast enhancement algorithm. The algorithm comprises the following steps: step 1: by establishing a functional relationship between a contrast enhancement threshold and an image grayscale dynamic range, implementing adaptive selection of a threshold; step 2: according to the contrast enhancement threshold and an image characteristic, determining gain coefficients required for contrast enhancement of different grayscales of dynamic images; step 3: based on the contrast enhancement threshold and the gain coefficients obtained in step 1 and 2, performing grayscale linear conversion on an input image; and step 4: in combination with an image characteristic after grayscale conversion, performing further modification on a grayscale dynamic range of the input image, and adjusting image brightness. The algorithm disclosed by the present invention is suitable for adaptively enhancing contrast of grayscale images and color images, and the algorithm makes images enhanced in contrast, clearer, and brighter in tones and effectively improves visual effects of images.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to an adaptive contrast enhancement algorithm based on gray scale transformation. Background technique [0002] Due to the influence of factors such as optical remote sensors and imaging conditions, actual images usually have problems such as decreased contrast and inconspicuous local details of the target, which will affect the fine recognition of the target by the human eye or the automatic recognition ability of the machine. In practical applications, image contrast enhancement technology is usually used to improve the visual effect of human eyes. This technology has been widely used in medical image diagnosis, remote sensing image enhancement, computer vision, and target recognition. [0003] The current adaptive image contrast enhancement algorithms are mainly divided into two categories: grayscale transformation method and histogram adjustment method. Among them, the g...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10004G06T2207/10024G06T5/92
Inventor 智喜洋江世凯胡建明张伟孙晅
Owner HARBIN INST OF TECH