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Evaluation Method of Absolute Contrast of Grayscale Image

A grayscale image and evaluation method technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of complex calculation method and influence, and achieve the effect of simple implementation process

Active Publication Date: 2017-03-08
NANYANG INST OF TECH
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Problems solved by technology

Finally, the root mean square error of the weighted difference image can be calculated to obtain the quality index of the image block, and the quality index of the entire image can be obtained by weighting the quality index of the image block. The calculation method is complicated, and the result is affected by the contrast sensitive function.

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  • Evaluation Method of Absolute Contrast of Grayscale Image
  • Evaluation Method of Absolute Contrast of Grayscale Image
  • Evaluation Method of Absolute Contrast of Grayscale Image

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Embodiment Construction

[0035] Reference figure 1 The method for evaluating absolute contrast of grayscale images of the present invention includes the following steps:

[0036] Step 1. Determine the background gray value of the image.

[0037] 1.1) Calculate the gray distribution of the input image, obtain the gray histogram, and find the gray value corresponding to the maximum peak-to-peak point in the gray histogram;

[0038] 1.2) Determine whether the gray value is equal to 0, if it is not equal to 0, the gray value of the peak point is used as the background gray value of the image; if the gray value is equal to 0, the average value is used as the background gray value .

[0039] Step 2. According to the background gray value, use the following formula to calculate the contrast value of each pixel in the image:

[0040] ;

[0041] Step 3. Calculate the average contrast ratio according to the following formula:

[0042] Is the average of image contrast;

[0043] Step 4. Calculate the absolute average of ...

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Abstract

The invention relates to the technical field of image fusion and imaging processing, in particular to a gray image absolute contrast evaluation method. According to the technical scheme, a gray histogram of an image is directly obtained, and contrasts of the source image are calculated according to the gray histogram; the average value of the contrasts and the absolute average value of the contrasts of the whole image are calculated; difference of the contrasts is calculated according to the contrast of each pixel and the absolute average value of the contrast of each pixel; an absolute contrast quality index of the image is obtained according to the average value of the contrasts and the difference of the contrasts. The method has the advantages that the contrasts of the image and the difference of the contrasts are calculated on the basis of the gray histogram, and image conversion is not needed, so that the calculation amount is remarkably reduced, program execution efficiency is improved, and an evaluation result is consistent with subjective perception of people.

Description

Technical field [0001] The invention relates to the technical field of image fusion and image processing, and in particular to a method for evaluating absolute contrast of grayscale images. Background technique [0002] Today, with the rapid development and wide application of science and technology such as microelectronics, computers, electronic information, and materials, it has also led to the rapid development of sensor technology. Various imaging sensors have different imaging mechanisms, different working wavelength ranges, different resolutions, and different working ranges and requirements. Any independent sensor has its functional limitations. Different sensors describe the scene completely differently. The target or scene information obtained by using a single sensor image has great unreliability, uncertainty and one-sidedness. In order to achieve a comprehensive description of the target, people naturally turn to multi-image information fusion. [0003] In the past th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/40
Inventor 刘尚争刘群坡陈居现王泽生刘峰冯君玲金鑫
Owner NANYANG INST OF TECH
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