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Non-uniform illuminance image enhancement method

An image enhancement and non-uniform technology, which is applied in image enhancement, image data processing, instruments, etc., can solve the problems of complex calculation and unsatisfactory non-uniform illumination image effects, etc., to suppress the overall noise, prevent excessive enhancement, and reduce the amount of calculation Effect

Inactive Publication Date: 2014-08-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the effect of the wavelet method on improving non-uniform illumination images is not ideal and the calculation is complicated

Method used

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Embodiment Construction

[0041] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0042] See attached figure 1 , the image enhancement method of a kind of non-uniform illumination of the present invention comprises the following steps:

[0043] Step 1: Statize the histogram of the non-uniform illumination image, and select the pixel value corresponding to the peak value of the histogram of the low-illumination part as W L , the pixel value corresponding to the peak value of the histogram of the high-illuminance part is recorded as W H , get the adaptive threshold X according to formula (1) m ;

[0044] x m =(W H -W L ) / 2+W L (one);

[0045] Step 2: According to the adaptive threshold X obtained in step 2 m The statistical histogram obtained in step 1 is divided into two sub-bands, a low-illuminance sub-band and a high-illuminance sub-band;

[0046] Step 3: Determine the pixel value X of each point of the image with n...

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Abstract

The invention provides a non-uniform illuminance image enhancement method, and belongs to the technical field of digital image processing. The method aims to solve the problems of an image enhancement method in the prior art; according to the method, image enhancement processing can be carried out on a non-uniform illuminance image. The non-uniform illuminance image enhancement method includes the following steps that a histogram of the non-uniform illuminance image is made, a threshold value is determined according to peak values of high illuminance and low illuminance, the histogram is divided into a high illuminance sub-band and a low illuminance sub-band, a sub-band brightness enhancement method is maintained for the high illuminance sub-band and a corresponding gray level mapping enhancement method is adopted for the low illuminance sub-band. According to the non-uniform illuminance image enhancement method, the situation that the image is excessively enhanced locally is avoided, overall noise of the image is inhibited, and the image which is uniform on the whole is obtained. The calculation amount of an algorithm is little, and the method is stable and reliable and can be used in real-time project systems.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, and in particular relates to an image enhancement method of non-uniform illumination. Background technique [0002] In the imaging system, due to the influence of imaging equipment and imaging conditions and the different absorption and reflection properties of the local surface of the imaging object, the illumination will be uneven and the imaging quality will be reduced. It has a serious impact on subsequent image processing and analysis, such as image segmentation, target recognition and tracking. Based on the optical correction method, a high-quality LED light source is usually used to obtain a relatively uniform lighting condition, but it is expensive and it is impossible to obtain a light source with absolutely uniform illumination. Therefore, it is currently a common method to eliminate the influence of non-uniform illumination on imaging quality and achieve the purpose o...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 毕国玲赵建续志军孙强
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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