Method for real-time restoration of fog-degraded image with white balance correction

A technology for degrading images and white balance. It is applied in image enhancement, image data processing, instruments, etc. It can solve the problems of complex algorithm, color shift, and inability to realize the DSP running platform, so as to reduce the complexity of the estimation algorithm and reduce the calculation effect of times

Inactive Publication Date: 2013-03-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the problem that the algorithm used in the existing foggy image restoration method is complex and the color shift will occur in the image processing pr

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  • Method for real-time restoration of fog-degraded image with white balance correction
  • Method for real-time restoration of fog-degraded image with white balance correction
  • Method for real-time restoration of fog-degraded image with white balance correction

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specific Embodiment approach 1

[0021] Specific implementation mode 1. Combination figure 1 Describe this embodiment, the method for real-time restoration of degraded images in foggy days with white balance correction, the method is implemented by the following steps:

[0022] Step A. Normalize the original degraded image in foggy weather with the atmospheric background and extract its minimum channel image. The value range of the normalized minimum channel image needs to be corrected to [0,1].

[0023] Step B. Obtain the dark channel image of the minimum channel image by using a statistical filtering method on the minimum channel image. The value range of the dark channel image is [0,1]; in the process of performing statistical filtering, a statistical fast filtering method with O(n) complexity is used.

[0024] Step C. According to the atmospheric optical imaging model, the dark channel image is used to obtain the transmission parameter image of the original degraded image in foggy weather.

[0025] Step...

specific Embodiment approach 2

[0046] Specific embodiment two, combine Figure 1 to Figure 5 This implementation mode is described. This implementation mode is a specific example of the method for real-time restoration of a foggy degraded image with white balance correction described in the first specific implementation mode:

[0047] Take the degraded RGB color image restoration as an example, see the original image image 3 (a),

[0048] 1. For the degraded images of exterior foggy days, the atmospheric optical model can express the degraded process of foggy weather images with the following formula.

[0049] O i (x,y)=J i (x,y)t(x,y)+A i (1-t(x,y)), i∈{R,G,B}

[0050] In this optical model, O(x,y) represents the input image; J(x,y) represents the undegraded original scene information at the scene; t(x,y) is the transmission parameter image of the medium (scene depth information image ), which is considered to have a common transmission parameter image in the RGB three-color space; A represents atmo...

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Abstract

A method for real-time restoration of a fog-degraded image with white balance correction relates to the image information processing field and solves the problems of complex algorithm, image shift in image processing process and unachievable embedded platforms such as DSP (Digital Signal Processor) and the like in the existing fog image restoration method. The method comprises the following steps of: performing normalization operation on an original fog-degraded image in the atmosphere background and extracting the minimum channel image of the original fog-degraded image, and obtaining a dark channel image by a statistical filtering quick method with O (N) complexity; then, obtaining the transmission parameter image of the original fog-degraded image; obtaining the restored image of the normalized fog-degraded image by using the transmission parameter image according to an atmosphere optical imaging model; and finally, according to the white balance theory, mapping the normalized restored image range to [0, 255] by taking the atmosphere background light as pure white. As a result, the output image obtained through white balance global mapping is the final restored image. The method provided by the invention is capable of meeting various outdoor scene monitoring application requirements.

Description

technical field [0001] The invention relates to the field of image information processing, in particular to a restoration method of degraded images in foggy weather. Background technique [0002] Fog is a relatively common natural phenomenon. Fog occurs more frequently in areas near the sea, near rivers, and forests due to the evaporation of water vapor. Under foggy conditions, there are a large amount of water vapor, dust and other particles suspended in the air, which causes serious attenuation of the reflected light of the scene under foggy conditions during transmission. Low contrast and fuzzy details seriously affect human observation and the performance of intelligent algorithms based on video understanding (such as vehicle detection at highway intersections). [0003] The restoration methods of foggy images mainly include methods based on atmospheric optical imaging models and methods not based on atmospheric optical imaging models. The methods of non-atmospheric o...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 吴笑天郝志成鲁剑峰朱明高文
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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