Image defogging method based on dark channel compensation and atmospheric light value improvement

A dark channel image and atmospheric light value technology, applied in the field of image processing, can solve the problems of insufficient defogging degree in local areas, underestimation of dark channel, increase of time complexity and space complexity of dark channel prior algorithm, and achieve atmospheric light value selection exact effect

A dark channel image and atmospheric light value technology, applied in the field of image processing, can solve the problems of insufficient defogging degree in local areas, underestimation of dark channel, increase of time complexity and space complexity of dark channel prior algorithm, and achieve atmospheric light value selection exact effect

CN110889805AActive Publication Date: 2020-03-17海南财顺宝科技有限公司
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  • Image defogging method based on dark channel compensation and atmospheric light value improvement
  • Image defogging method based on dark channel compensation and atmospheric light value improvement
  • Image defogging method based on dark channel compensation and atmospheric light value improvement

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Effect test

Embodiment

[0149] The present invention obtains the transmittance of the image through the color attenuation prior algorithm proposed by Zhu et al., and then uses the formula Reversely deduce the dark channel that is not underestimated, and select 100 training samples and 24 million pixels to train the linear model, and get the best training results C1=0.91098, C2=-0.12076, C3=0.12893, C4=0.03144,

[0150]

[0151] 1) The halo phenomenon that exists prior to the dark channel

[0152] Process the actual image, and the results before and after dark channel compensation: select the foggy image shown in Figure 3(a); Figure 3(b) is the original dark channel image; Figure 3(c) is the dark channel after compensation Image; Fig. 3(d) is the original processing result; Fig. 3(e) is the processing result after compensation.

[0153] From the comparison of Figure 3(c) and Figure 3(b), it can be seen that the compensated dark channel significantly improves the pixel value at the edge of the ima...

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Abstract

The invention discloses an image defogging method based on dark channel compensation and atmospheric light value improvement, which not only can effectively correct an underestimated dark channel value and weaken the halo effect at the edge of an image scene, but also can accurately obtain the atmospheric light value of an image, so that the recovered image is clearer and more natural, and the details are more abundant. The method comprises the following specific implementation steps: firstly, solving a minimum channel image by utilizing R, G and B color channels of an original image, and obtaining a compensated dark channel image by virtue of a dark channel compensation model; then, calculating the atmospheric light value of the image through the steps of graying processing, quadtree segmentation and the like on the original image; and finally, estimating the image transmissivity by combining the dark channel image and the atmospheric light value, and recovering a fog-free image through an atmospheric scattering model. Experimental results and subjective and objective evaluation prove the feasibility and effectiveness of the method.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an image defogging method based on dark channel compensation and atmospheric light value improvement. Background technique [0002] In the haze scene, the suspended particles in the atmosphere will inevitably absorb and scatter the light to a certain extent, resulting in a significant decrease in the visibility of outdoor images, leading to image degradation such as a decrease in contrast and color attenuation, affecting the visual observation of the human eye and The normal operation of machine vision equipment, so the study of image defogging methods has very important practical significance. [0003] Image defogging methods are mainly divided into two types, one is the defogging method based on image enhancement, which mainly realizes the clarity of the image by improving the contrast and highlighting the details, but this method ignores the inner connecti...

Claims

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Application Information

Patent Timeline
17 Mar 2020
Publication
CN110889805A
IPC
G06T5/00; G06T5/30; G06T7/11
CPC
G06T5/30; G06T7/11; G06T2207/30192; G06T5/73; G06T5/70; Y02A90/10
Inventors
胡辽林; 高强