A method for improving the clarity of traffic video images based on dark channel technology
A technology of dark channel images and video images, applied in image enhancement, image data processing, instruments, etc., can solve the problems of not meeting the prior conditions of the dark channel method, a large number of images, bright white halos, etc.
Active Publication Date: 2017-02-08
NANJING GENERAL ELECTRONICS
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Problems solved by technology
Because the block calculation method is used in the dark channel processing, there are relatively obvious squares in the initial transmission image, and it does not fit the geometric edge of the original image well.
[0004] However, a large amount of statistical data shows that there are a large number of gray-white areas in most fogged traffic video images, and such areas do not meet the prior conditions of the dark channel method. A large amount of bright white halo appears in the image after fog
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Embodiment 1
[0091] According to the technical scheme of the present invention, in this embodiment, Fig. 2(a) is used as the original input image, and a window of 15*15 pixels is used to traverse the original input image to obtain the dark channel image as shown in Fig. 2(c); according to the dark channel image Obtain the sky brightness value A; set the atomization concentration τ as 0.1 and bring it into the calculation formula of transmittance, and obtain the transmittance distribution diagram as shown in Figure 2(d); calculate the image after defogging and calculate the peak-to-noise ratio; when When the peak-to-noise ratio stops growing, the output image after defogging is shown in Figure 2(b).
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The invention discloses a method for improving traffic video image definition based on a dark channel technology. The method includes the steps that dark channel processing is carried out on traffic video images of a road in adverse weather (like haze and the like) to obtain dark channel images; a sky brightness value is obtained according to the dark channel images; an atomization concentration value is set, and a physical model of the atomized images is set up; a transmittivity distribution law function is improved, defogged images are obtained through processing, and the peak value signal-to-noise ratios are calculated; the peak value signal-to-noise ratios are compared, and the defogged traffic video image with the optimum effect is output. The transmittivity distribution law of the dark channel images is improved, a threshold value is set for the regions which do not meet dark channel priori conditions, and therefore the defogging effect is better; in addition, the quality of image processing is evaluated by introducing the peak value signal-to-noise ratio evaluation method, and therefore the images can be processed more intelligently.
Description
【Technical field】 [0001] The invention belongs to the field of improving the visual distance of road vehicle drivers in bad weather, and relates to a method for improving the clarity of traffic video images based on dark channel technology. 【Background technique】 [0002] In recent years, the environment has been deteriorating day by day. Heavy rain, sandstorms and smog have become more and more serious, and visibility has become lower and lower, which have had a great impact on people's lives, especially on traffic. In the foggy environment, due to the influence of atmospheric scattering, the visibility and contrast of the scenes captured by the surveillance camera are reduced, which directly affects the safety of aviation, shipping and road traffic. often does not work reliably. In highway traffic, sometimes in severe haze weather, the visual distance (visibility) of the vehicle driver is only tens of meters, thus causing a series of serial vehicle collision accidents. T...
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IPC IPC(8): G06T5/00
Inventor 陈杰
Owner NANJING GENERAL ELECTRONICS
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