Image enhancement method and system

An image enhancement and input image technology, applied in image enhancement, image analysis, image data processing and other directions, can solve problems such as inconsistency, block effect, poor image processing effect, etc., to achieve the effect of brightness improvement

Active Publication Date: 2019-08-23
SUZHOU KEDA TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

Multi-scale Retinex (MSR, Multi-Scale Retinex) and MSR with color restoration (MSRCR, Multi-Scales Retinex with Color Restoration) are two methods that are widely used. However, these two algorithms are not suitable for image processing with multiple light sources. The effect is not good, and it is prone to halo artifacts
For a darker image, the brightness of the output image is too high. Although it looks clearer, it is not in line with the real scene; especially when the image quality is poor, the output image is accompanied by noise, block effects, and the effect becomes worse.

Method used

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  • Image enhancement method and system

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Embodiment Construction

[0062] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus their repeated descriptions will be omitted.

[0063] Such as figure 1 As shown, the present invention provides a kind of image enhancement method, comprises the steps:

[0064] S100: Obtain the input luminance value of each pixel in the input image, and calculate the logarithmic average of the input luminance value;

[0065] S200: Process the input image based on the Retinex image enhancement algorithm to obtain the first brightness gain value of each pixel;

[0066] S...

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Abstract

The present invention provides an image enhancement method and system. The method includes obtaining an input brightness value, and calculating the logarithmic mean value of the input brightness value; processing the input image based on the Retinex image enhancement algorithm to obtain a first brightness gain value; according to the input brightness value The logarithmic average value of is calculated to obtain the brightness gain control factor; according to the brightness gain control factor and the first brightness gain value, the second brightness gain value is calculated; according to the second brightness gain value, the input image is enhanced to obtain an output image. The present invention uses the Retinex image enhancement algorithm to enhance the input image, and by using the brightness gain control factor, when the image brightness is low, the first brightness gain value will be compressed relatively, and when the image brightness is high, the first brightness gain value The gain value is compressed by a small amount, so that the brightness gain of the dark image can be reduced; the brightness of the output image can be effectively controlled, so that the brightness of the output image can be improved and conform to the real environment.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to an image enhancement method and system based on a Retinex image enhancement algorithm. Background technique [0002] The video capture process is affected by many factors, such as insufficient light and low brightness under shooting conditions at night or in dark light; light occlusion makes part of the formed image bright and the other part dark, resulting in uneven lighting; reflection or strong light source makes the acquired The brightness distribution of the image is uneven, and the details of the highlighted area are blurred. Insufficient illumination or uneven illumination will cause poor subjective image effects on the one hand, and it is difficult to meet the needs of people's visual senses. On the other hand, it will have a great impact on subsequent image processing such as pattern recognition and target tracking. Therefore, image enhancement technolog...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06T5/00G06T5/20
CPCG06T5/20G06T2207/20024G06T5/94G06T2207/20012
Inventor孟国庆汤峰峰章勇曹李军陈卫东
OwnerSUZHOU KEDA TECH