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Image intensification method

An image enhancement and block image technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of monitoring image degradation, exposure range control, lack of definition enhancement, etc., to achieve simple implementation, significant effect, and image clarity enhanced effect

Active Publication Date: 2013-05-08
SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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Problems solved by technology

Due to the scattering effect of atmospheric particles and the attenuation of light projection rate in rainy and foggy weather, the color and clarity of outdoor images of visible light imaging systems are seriously degraded, which hinders the extraction of image information and is not conducive to applications such as urban security and traffic monitoring.
[0003] Due to the influence of fog, rain, mist and other atmospheric environments in existing outdoor video surveillance, the monitoring image is seriously degraded. Existing image enhancement methods often ignore color enhancement, and lack of exposure range control in terms of definition enhancement. Ineffective
[0004] 1. The post-processing enhancement of the existing video surveillance image effect is not enough
[0005] 2. The existing image defogging model does not fully consider the scattering effect of the outdoor atmospheric environment on the light, which causes the color degradation of the monitoring image, and the color of the monitoring image violates the principle of physical color constancy
[0006] 3. The existing sharpness enhancement does not fully consider the principle of not overflowing the image exposure range, which may weaken the details while enhancing the image sharpness

Method used

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Embodiment Construction

[0019] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

[0020] see figure 1 , the invention provides a kind of image enhancement algorithm, it comprises steps:

[0021] A), preprocessing, the image is divided into multiple block images, the best, the image is divided into multiple block images of twelve (such as figure 2 is divided into 12), and then calculate the mean Mb, Mr and standard deviation Db, Dr of the two chrominance signals (usually red and blue) of all pixels in each block image, if the block image corresponds to the standard If the variance is lower than the set value, the block image will be removed from the algorithm, and the remaining part will be used as the image to be enhanced to continue the step.

[0022] The optimal setting value of the elimination condition in this st...

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Abstract

The invention provides an image intensification method. According to obtaining features of a monitoring image, aiming at environmental light color temperature, dynamic white point white balance is adopted to revise the color degradation of the image in an algorithm. Aiming at that an air refractive index is decayed to affect the monitoring image to be fuzzy, contrast ratio increases to strengthened image definition. Finally, histogram normalization is adopted to control an image exposure range not to overflow, the image definition is strengthened, and at the same time, details are not weakened. The whole image intensification method is easy to achieve, significant in effect, and especially suitable for the field of outdoor video monitoring.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to an image enhancement method. Background technique [0002] With the development of human society and the over-exploitation of the environment, the air quality has become worse and worse, and various weathers such as ash, mist, fog, and rain have more influences. Due to the scattering effect of atmospheric particles and the attenuation of light projection rate in rainy and foggy weather, the color and clarity of outdoor images of visible light imaging systems are seriously degraded, which hinders the extraction of image information and is not conducive to applications such as urban security and traffic monitoring. [0003] Due to the influence of fog, rain, mist and other atmospheric environments in existing outdoor video surveillance, the monitoring image is seriously degraded. Existing image enhancement methods often ignore color enhancement, and lack of exposure range co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 刘传华
Owner SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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