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Dehazing method for a small amount of background foggy images

An image and background technology, applied in the field of image processing, can solve the problems of dehazing image brightness and contrast, and achieve the effect of high quality, simple and flexible operation, and high algorithm efficiency.

Active Publication Date: 2018-02-06
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to defog an image with a small amount of background light and avoid the decrease in brightness and contrast of the defogged image

Method used

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  • Dehazing method for a small amount of background foggy images
  • Dehazing method for a small amount of background foggy images
  • Dehazing method for a small amount of background foggy images

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] The invention provides a method for defogging an image with a small amount of background fog, comprising the following steps:

[0017] S1. Obtain the intensity histogram A of the foggy image, judge whether the histogram A satisfies a small amount of background light, and find the coordinates of the termination point on the right edge (x A ,y B );

[0018] S2. Dehaze the fogged image by using a dark channel prior algorithm;

[0019] S3. Determine the degree of defogging. If the fog is not completely removed, change the parameters and re-execute step S2;

[0020] S4, if the fog has been removed, find the histogram B of the fog-removed image, and mark the starting point coordinates of the right edge of the peak value (x H ,y H ), the end point coordinates of the right edge of the marker (x L ,y L );

[0021] S5, stretching...

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Abstract

The invention discloses a method for defogging a foggy image with a small amount of background, including S1, obtaining the intensity histogram A of the foggy image, judging whether it satisfies a small amount of background light, and finding the coordinates of the termination point on the right edge; S2, using a dark channel first Defog the fog-containing image by the test algorithm; S3, judge the degree of fog removal, if the fog has not been removed, change the parameters, and re-execute step S2; S4, if the fog has been removed, obtain the histogram B of the fog-removed image , mark the starting point coordinates of the right edge of the peak, and mark the ending point coordinates of the right edge; S5, perform histogram stretching; S6, perform histogram specification on the reconstructed histogram B' and the dehazed image. The post-processing of the dark channel prior algorithm through the histogram in the present invention is simple and flexible, and different parameters can be set according to different specific images, which avoids the difficulty of fine-tuning the dark channel prior processing results; the algorithm efficiency is high, and the obtained The fog image has higher quality and is closer to the real fog-free image.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method for defogging an image with a small amount of background fog. Background technique [0002] With the continuous development of computer software and hardware technology, it has become possible to dehaze the scene images of foggy weather images, which in turn puts forward new requirements for the clarity and realism of dehazed images. [0003] In foggy weather, due to the large number of particles such as water droplets in the atmosphere, as the distance between the object and the imaging device increases, the impact of the scattering of atmospheric particles on imaging gradually increases. The above effects are mainly caused by two scattering processes: first First, the reflected light on the surface of the object is attenuated due to the scattering of atmospheric particles when it reaches the imaging device; second, natural light enters the imaging device to participate in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 朱青松杨帅
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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