Single image defogging method based on sky region probability segmentation

A sky area, single image technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problem of dark image, reduced visual effect, etc., to improve visual effect, solve color distortion, reduce block effect. Effect

Active Publication Date: 2020-02-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

In addition, the commonly used defogging results based on physical models are prone to image darkening, which leads to reduced visual effects.

Method used

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  • Single image defogging method based on sky region probability segmentation
  • Single image defogging method based on sky region probability segmentation
  • Single image defogging method based on sky region probability segmentation

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Embodiment Construction

[0041] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0042] The present invention provides a single image defogging method based on probability segmentation of sky area, proposes a sky area segmentation algorithm based on probability model, divides the foggy image into two parts - sky area and non-sky area, and then The transmittance of the sky area is corrected, that is, the non-sky area still uses the initially estimated transmittance; for the sky area that does not meet the dark channel theory, the initial transmittance is amplified by the gain based on the improved tolerance mechanism, and the corrected transmittance map is obtained; The atmospheric light and transmittance estimated by the above method are used to reversely solve the atmospheric scattering model to obtain the initial dehazing result. And adopt Fourier transform method to adjust the brightness and details of the image.

[0043] The flow ...

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Abstract

The invention discloses a single image defogging method based on sky region probability segmentation. According to the invention, the sky area of the foggy image can be effectively identified and segmented, and the visual effect of the defogged image is good. By summarizing and analyzing the sky area of the foggy image, a sky area recognition algorithm based on a probability model is provided, andthe sky area of the foggy image is effectively recognized and segmented; then different transmissivity is adopted for the sky area and the non-sky area respectively, namely, gain amplification basedon an improved tolerance mechanism is conducted on the transmissivity of the sky area, the problem that the transmissivity of the sky area is underestimated is solved, and then the problem of color distortion of the sky area of the defogged image is solved. Moreover, the transmissivity is optimized by introducing a global smooth filtering method, so that the blocking effect of a defogging result is reduced; and details and brightness of the image are adjusted by adopting a Fourier transform method and gamma correction, so that the visual effect of the defogged image is improved.

Description

technical field [0001] The invention relates to the technical field of digital image processing, is suitable for preprocessing of computer vision applications, and can be widely used in mobile phone shooting, family and road monitoring, vehicle recorders and other fields, and specifically relates to a single image based on the probability segmentation of sky regions Defog method. Background technique [0002] Outdoor visibility is low in foggy or hazy weather, and images and videos captured often suffer from degradation. In order to improve the quality of the image and improve the clarity of the image, the image needs to be defogged. [0003] The current methods for foggy image processing can be divided into three categories: one is based on image enhancement methods, this type of method does not consider the specific formation process of the foggy image, and only selects the interesting part of the image for enhancement. Commonly used image enhancement methods include his...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/11G06T7/136G06T7/90
CPCG06T5/003G06T2207/30192G06T7/11G06T7/136G06T7/90
Inventor 白永强刘康陈杰窦丽华张佳邓方甘明刚
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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