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Fusion channel based and sky immune image defogging method

An image and channel technology, applied in the field of image defogging based on fusion channels and immune to the sky, can solve the problems of cumbersome recognition process, poor defogging effect, color distortion in the sky area, etc., to improve universality and robustness Effect

Inactive Publication Date: 2017-06-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In order to solve the problems of the existing image defogging method, such as the color distortion of the sky area on the image, halo phenomenon and block effect, resulting in poor defogging effect and the cumbersome recognition process and large amount of calculation in the existing method, the present invention provides a solution. An Image Dehazing Method Based on Fusion Channels and Immune to Sky

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specific Embodiment approach 1

[0025] Specific implementation mode 1. Combination Figure 1 to Figure 6 Describe this embodiment, the image defogging method based on the fusion channel and immune to the sky, the method is implemented by the following steps:

[0026] Step 1: Perform minimum and maximum filtering on the original foggy image I(x), respectively, and obtain images of dark primary color and bright primary color channels respectively.

[0027] Step 2: Take the top 0.1% pixels of the dark channel image sorted by pixel value, and find the corresponding pixel value points in the original foggy image, and take the largest pixel value as a rough estimate of atmospheric light A.

[0028] Step 3: Based on the rough estimation of atmospheric light A in step 2, the transmittance of the dark channel is obtained according to formula (5) and formula (10) and the transmittance of the bright channel a rough estimate of

[0029] The specific process is:

[0030] In the field of computer vision, the atmosph...

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Abstract

The present invention discloses a fusion channel based and sky immune image defogging method, relates to the technical field of digital image processing, and solves problems that in the existing image defogging method, after defogging, the defogging effect is poor due to color distortion in the sky area, and occurrence of the phenomenon of halo and the block effect, and the existing method has a cumbersome recognition process, a large amount of calculation, and so on. The method disclosed by the present invention comprises: carrying out minimum and maximum values filtering on a fog image, roughly estimating atmospheric light, introducing correction factors, and carrying out rough estimate on the transmittance of the dark channel and the transmittance of the bright channel respectively; using the guided filter to carry out precise optimization respectively, determining whether the transmittance of the dark channel is greater than the transmittance of the bright channel (wherein, if so, the dark primary channel image is the sky area, and if not, the dark primary channel image is not the sky area), and obtaining precise estimate of the fusion transmittance; and taking the pixel mean value as the adaptive accurate estimate and the fusion transmittance of the atmospheric light, and obtaining a clear defogging image by using the atmospheric scattering imaging model.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to an image defogging method based on a fusion channel and immune to sky. Background technique [0002] In recent years, hazy weather is more common. Due to the absorption and scattering of light by a large number of aerosol particles and tiny water droplets in the air, the quality of outdoor imaging is seriously degraded. It not only affects the visual effect, but also directly limits the effectiveness of the outdoor imaging system, which brings difficulties to the later image processing and analysis. Therefore, it is very necessary to sharpen the image in foggy weather. [0003] At present, image defogging technology has become a research hotspot, and there are two methods for single image defogging: image enhancement method and image restoration method. The image enhancement method mainly uses image processing and other means, such as histogram equalization, fr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/94G06T5/73
Inventor 毕国玲付天骄聂婷薛金来陈长征
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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