Video defogging method and system
A video and video frame technology, applied in image data processing, instruments, computing, etc., can solve problems such as the overall darkening of the picture and the block effect of the headlight area, and achieve the effect of avoiding excessive image explosion, fast speed and clear picture.
Active Publication Date: 2014-09-10
ZHEJIANG LIYUAN COMM TECH
View PDF3 Cites 26 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
He's algorithm deals with natural scenery and aerial images. In security monitoring, intelligent transportation and other fields, especially in foggy weather, when the headlights are turned on, if the maximum value or the average value of the maximum value range is taken as the atmospheric light according to the general strategy value, it is easy to mistake the brightness of the headlights as the atmospheric light value, which will cause serious problems
Even according to the improved atmospheric light calculation method proposed by He later, the average value of the dark channel maximum area is used as the atmospheric light estimation value, the resulting effect will be that the overall picture will be dark, and there will be disharmony such as block effects in the headlight area Phenomenon
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
specific Embodiment approach
[0058] The specific implementation of the video defogging method and system of the present invention is as follows:
[0059] Reference attached Figure 1-3 , as attached figure 2 A video defogging method and system shown, comprising the following steps:
[0060] Step 1, input foggy video frames containing RGB image information.
[0061] Step 2, calculate the atmospheric light value:
[0062] If it is the starting frame, after removing 240-255 pixels in the image, select the average value of 1% of the pixels with the largest brightness value as the estimated atmospheric light value, and calculate the RGB three channels separately to get A r ,A g ,A b Individual atmospheric light values for the three channels. If it is not the starting frame, choose the average value of the 1% region with the smallest transmittance in the image as the estimated value of the atmospheric light value. The value of n is 1000, that is, the calculation of the atmospheric light value is calcu...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a video defogging method and a video defogging system. The technical scheme is that the method comprises the following steps: inputting a foggy video frame RGB (Red Green Blue) image, calculating an atmospherical light value and a transmissivity image, taking the transmissivity image as a guide filter, and correcting the image to obtain a defogged video frame. The calculation of the atmospherical light value is performed in two conditions: if the transmissivity image is unavailable, calculating to obtain the atmospherical light value according to a brighter pixel region (specially bright pixels in addition to subtitles, light and others) in the image; if the transmissivity image is available, calculating to obtain the atmospherical light value according to pixels in a part of region with lowest transmissivity. According to the video defogging method, the problems that a defogging algorithm is slow in speed, and the atmospherical light value is interfered by the light, subtitles and others which are not in harmony with a screen can be solved, haze can be effectively eliminated, and the primary detailed features of the image can be reserved, therefore the method has the advantages of low computation complexity, harmonious in all defogged regions of the image and the like; furthermore, the method can be used for the preptreatment for the foggy video in the applications of video surveillance and the like, and can be beneficial for subsequent video analysis and manually watching the defogged videos.
Description
technical field [0001] The invention relates to a video image processing method, in particular to a video defogging method and system. Background technique [0002] Due to the aggravation of urban air pollution, hazy weather is becoming more and more frequent, which brings challenges to the picture quality of outdoor video surveillance. How to improve the effect of outdoor video surveillance in smoggy weather has received special attention and research and development from academia and industry. [0003] From the perspective of hardware solutions, the filter can allow part of the invisible light to penetrate, thereby enhancing the quality of the image. From the perspective of software algorithm solutions, the post-processing of images by defogging algorithms is a relatively simple method. Since it is impossible to replace all installed cameras with the latest cameras with defogging functions, algorithm-based post-processing algorithms are a more practical solution. In som...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G06T5/00
Inventor 袁义雷郑仙斌余意
Owner ZHEJIANG LIYUAN COMM TECH