Enhancement method of low-illumination color image

A color image, low-illumination technology, applied in the field of image processing, to achieve strong contrast, enhanced low-illumination images, and good results

Active Publication Date: 2019-09-24
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] In order to enhance low-illuminance image contrast and visual effects to solve images under special backgrounds such as low-illuminance or night road traffic video surveillance, daily color image processing, ships, night criminal images, mine images, etc., the present invention utilizes a multi-scale Retinex algorithm With the homomorphic high and low frequency filtering algorithm, a low-illuminance color image enhancement method is proposed to process low-illumination images, thereby making a key and important step for extracting important information from low-illumination images such as night and darkness

Method used

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] refer to figure 1 and figure 2 , a method for enhancing a low-illuminance color image, comprising the following steps:

[0028] S1: input low-light image f(x);

[0029] S2: Carry out color separation to input image, obtain R, G, B three component images respectively;

[0030] S3: adopt homomorphic high-frequency filter and homomorphic low-pass filter respectively to the image of three components, obtain the high-low frequency image of each component respectively, wherein high-frequency homomorphic filter function expression is:

[0031] h H (i,j)=1 / (1+D(i,j)^(-t))

[0032] The expression of the low-frequency homomorphic filter function is:

[0033]

[0034] where t is the adjustment parameter, D 0 Represents the cutoff frequency, D(i,j) represents the point (i,j) to the filter center (i 0 , j 0 )distance,

[0035] S4: Carry out linear scaling tra...

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Abstract

The invention discloses an enhancement method of a low-illumination color image. The method comprises the following steps: S1, inputting a low-illumination image; S2, performing color separation on the input image to obtain R, G and B component images; S3, performing homomorphic high-frequency filtering and homomorphic low-frequency filtering on the three component images to respectively obtain high-frequency and low-frequency images of each component; S4, performing linear scaling transformation on the low-frequency image of each component; S5, performing multi-scale Retinex algorithm processing on the high-frequency image of each component; S6, combining the high-frequency image and the low-frequency image after each component is processed; and S7, combining the three component images to obtain an enhanced low-illumination color image. According to the method, the low-illumination color image is enhanced, so that the enhanced image is clearer in detail and higher in contrast ratio, and a better visual effect is achieved.

Description

technical field [0001] The invention relates to image enhancement technology in the field of image processing, in particular to an enhancement method for low-illuminance color images. Background technique [0002] With the rapid development of computer technology and ARM technology, image processing is widely used in many application fields such as aerospace, military, biomedicine and artificial intelligence. Image augmentation provides a key step in image processing. For pictures in dark environments, many unknown contents cannot be displayed, which will lead to loss of important information. For example, in low-light conditions such as night and darkness, video surveillance captures traffic conditions, daily color image processing, ships, images of night criminals, mine images, etc. Therefore, research on low-light image enhancement methods is extremely valuable. [0003] Homomorphic filtering and Retinex algorithm are relatively important processing methods in the field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/009G06T2207/10024
Inventor 张江鑫杨惠李若玥
Owner ZHEJIANG UNIV OF TECH
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