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A Method for Automatically Obtaining Afterimage Correction Coefficient

A technology of automatic acquisition of correction coefficients, applied in the field of detectors, can solve problems such as low efficiency of manual test coefficients, small tolerance range, and influence on accuracy, and achieve the effects of uniformity of calculation results, stability of calculation results, and stability

Active Publication Date: 2022-04-19
SHANGHAI IRAY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for automatically obtaining the afterimage correction coefficient, which is used to solve the problem of low efficiency, poor consistency, small tolerance range and influence on fitting of manual test coefficients in the prior art. the accuracy of the

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  • A Method for Automatically Obtaining Afterimage Correction Coefficient
  • A Method for Automatically Obtaining Afterimage Correction Coefficient
  • A Method for Automatically Obtaining Afterimage Correction Coefficient

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Embodiment 1

[0033] see figure 1 , the present invention provides a method for automatically obtaining the afterimage correction coefficient, which is fundamentally to obtain the ratio of the difference between the afterimage image and the image difference on the correction template. The correction factor can be obtained by dividing. Specifically, the method for automatically obtaining the afterimage correction coefficient at least includes the following steps:

[0034] S1. Obtain a correction template and an image to be corrected;

[0035] S2. Read the correction template and perform gradient calculation, and determine the edge of the reference object figure in the correction template according to the gradient value;

[0036] S3. Randomly select several pixels in the reference object graphic area of ​​the correction template as the first selection area, randomly select the same number of pixels outside the reference object graphic area of ​​the correction template as the second selectio...

Embodiment 2

[0054] The difference between this embodiment and Embodiment 1 is that the image of the selected calibration template is changed. In this embodiment, obtaining the correction template and the image to be corrected at least includes the following steps:

[0055] Take pictures of reference objects under high-dose exposure, and select correction templates in bright-field images;

[0056] After the exposure, the reference object was removed, and the image to be corrected was acquired under a small dose of exposure.

[0057] Here, the acquired correction template is selected from the bright-field image instead of the dark-field image, and the correction template is selected from the bright-field image with the largest residual image.

Embodiment 3

[0059] This embodiment uses the algorithm of the present invention to calculate the afterimage coefficient similarly to the above-mentioned Embodiment 1 and Embodiment 2, but only adjusts the method for obtaining the selection area. Specifically, place the reference object at a fixed position on the flat panel detector, select a fixed area in the graphics area of ​​the calibration template as the first selection area, and select a fixed area outside the graphics area of ​​the calibration template as the second selection area, and Calculating the regional gray value difference between the two selection areas, wherein the number of pixels in the first selection area and the second selection area are the same. This method can also achieve the purpose, but it is not random, and requires the tester to place the tungsten piece in the same area every time, which increases the limit and prolongs the time for taking pictures.

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Abstract

The invention provides a method for automatically obtaining afterimage correction coefficients, comprising: obtaining a correction template and an image to be corrected; reading the correction template and performing gradient calculations to determine the edge of a reference object graphic; selecting several pixel points in the reference object graphic area as In the first selection area, select the same number of pixels outside the reference graphic area of ​​the correction template as the second selection area, and calculate the regional gray level difference between the two selection areas; read an image to be corrected, and calculate the difference between the image to be corrected and the correction The regional grayscale difference between the first constituency and the second constituency corresponding to the first constituency and the second constituency in the template; the difference between the gray average value of the two constituencies on the image to be corrected and the gray average value of the two constituencies on the correction template Make a ratio to get the afterimage correction coefficient. The method for automatically obtaining the afterimage correction coefficient of the present invention uses an algorithm to calculate the afterimage coefficient, which saves manpower, improves the efficiency of the afterimage test, ensures the stability of the calculation result, and facilitates the accuracy of later analysis and fitting.

Description

technical field [0001] The invention relates to image processing technology in the field of detectors, in particular to a method for automatically obtaining afterimage correction coefficients. Background technique [0002] The flat panel detector is used as an X-ray imaging system. Due to the material, the afterimage cannot be completely avoided in principle. It is necessary to apply a correction algorithm, and the effect of the algorithm is largely related to the fitting coefficient. In order to test a series of Coefficient, currently generally rely on manual visual inspection, substituting the coefficient to observe the application effect to obtain the afterimage coefficient. However, in the case of a large number of images, manual calculation of coefficients often leads to errors and low efficiency, resulting in unsatisfactory fitting results afterwards, and the so-called algorithm for calculating coefficients is nothing more than automatically bringing the coefficients i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
CPCG06T11/008
Inventor 吴鹏
Owner SHANGHAI IRAY TECH