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Method and device for defogging single image

A single image, image technology, applied in the field of realizing single image defogging, to achieve the effect of avoiding edge effects, simple and flexible algorithm, and high efficiency

Inactive Publication Date: 2015-02-11
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0014] The purpose of the present invention is to provide a method and device for realizing single image defogging, which aims to solve the technical problem that the existing single image defogging algorithm will produce obvious halo effect at the edge of the image

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  • Method and device for defogging single image

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[0034] In order to make the object, technical solution and beneficial effects of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] An embodiment of the present invention provides a method for dehazing a single image, the method comprising: calculating the ambient light intensity A of the foggy image; dividing the foggy image into the same sub-image area with a small change in grayscale Several sub-image regions; for the several sub-image regions, obtain the dark channel map of each sub-image region respectively; calculate the transmittance t(x) of each pixel in the dark channel map of each sub-image region; according to the formula The image J(x) obtained after dehazing is calculated, and the I(x) is the fog...

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Abstract

The invention provides a method and a device for defogging a single image and aims at solving the technical problem that an obvious vignetting effect generates at the edge of the image by the existing defogging algorithm for the single image. The method comprises the following steps of solving the ambient light intensity A of a foggy image; segmenting the foggy image into a plurality of sub-image regions with smaller gray change in the same sub-image region; aiming at the sub-image regions, respectively acquiring dark channel patterns of all the sub-image regions; calculating the transmittance t(x) of each pixel in the dark channel pattern of each sub-image region; solving the defogged image J(x) according to a formula, wherein I(x) is a foggy image. According to the method provided by the invention, on the one hand, the edge effect generated by directly using dark channel prior for defogging is avoided, and the algorithm is simple, flexible and highly-efficient; on the other hand, the finally-obtained defogged picture is high in quality, the image contrast is greatly enhanced, and the visual effect is greatly improved compared with that of the original foggy image.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a method and device for realizing single image defogging. 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, so new requirements are put forward for the clarity and realism of the dehazed images. 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 scattering effect of atmospheric particles on imaging gradually increases. This effect is mainly caused by two scattering processes: the 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 imaging due to the scattering of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 朱青松宋展吴迪
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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