Signal lamp image processing method

A technology of image processing and signal lights, applied in image data processing, image enhancement, image analysis, etc., to achieve the effect of easy identification and solving color distortion

Active Publication Date: 2017-12-22
JIANGSU AEROSPACE DAWEI TECH CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a signal light image processing method, which can better deal with the problems of halo caused by signal light overexposure and color distortion caused by signal light overexposure or insufficient light

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0063] The invention first divides the whole-day images captured by the camera into intervals based on the average brightness of the images, and then processes them differently according to the intervals. During the processing, binary processing is performed on the range of the light box of the signal light according to the brightness information of the signal light in the image. For signal light areas with obvious grayscale changes, the optimal threshold for image segmentation is calculated by the method of maximum inter-class variance, and the foreground and background of signal lights are segmented according to the threshold, the complete signal light area is extracted, and the binarization of the image is completed, and then the next step is performed. processing in one step. For signal light areas with little grayscale change or images at night, use the c...

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Abstract

The invention provides a signal lamp image processing method. When processing images acquired by a camera in the whole day time, the signal lamp image processing method comprises the steps of dividing the images according to average brightness thereof firstly, then processing the images by using different methods. When an average brightness value of the images is less than a brightness threshold value A, an image processing method with the minimum interval of brightness values is used for processing the images. When the average brightness value of the images is greater than the brightness threshold value A and less than a brightness threshold value B, and B is greater than A, an image processing method with a smaller interval of brightness values is used for processing the images. When the average brightness value of the images is greater than the brightness threshold value B, an image processing method of daytime is used for processing the images. The signal lamp image processing method can solve the problems of halo caused by overexposure of a signal lamp and color distortion caused by overexposure of the signal lamp or insufficient light.

Description

technical field [0001] The invention relates to the technical field of video monitoring, in particular to a signal lamp image processing method. Background technique [0002] In order to monitor the traffic conditions of the urban road network, the traffic management department installs an electronic police system to automatically detect and record the driving behavior of motor vehicles in the lanes at intersections and road sections. Although there are automatic exposure and automatic gain algorithms in the smart camera to control the brightness of the picture, because the traffic lights account for a very small proportion of the whole picture, the algorithm adjustment often pays more attention to the overall brightness effect rather than the local area. Therefore, when the ambient light is too low, after the algorithm is adjusted, the central area of ​​the signal light will be overexposed, resulting in color distortion, and halos will appear on the edge of the signal light...

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Application Information

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IPC IPC(8): G06T5/00G06K9/36G06K9/32G06K9/34G06K9/00
CPCG06T2207/30232G06V20/54G06V10/25G06V10/20G06V10/267G06T5/90
Inventor 程传格徐益张申浩包可为
Owner JIANGSU AEROSPACE DAWEI TECH CO LTD
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