A method for determining the modulation degree of a ray digital image and its application

A technology of digital image and determination method, applied in image analysis, image enhancement, image data processing and other directions, can solve the problems of difficult identification, poor repeatability, and easy identification.

Inactive Publication Date: 2021-02-09
BEIJING AEROSPACE GUANGHUA ELECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Defects are not easily identified or are easily identified incorrectly
The characteristics of ray detection The scale quantitative measurement of existing equipment has a lot of human subjective factors. For example, measuring the distance between a pair of lines requires manual judgment and marking of the edge position to be measured to obtain pixel-level measurement results. However, if the imaging image Unclear or close to the resolution limit, or the ct layered imaging results are not sharp due to the large number of stacked layers, which will cause large errors in manual judgment and marking, and poor repeatability

Method used

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  • A method for determining the modulation degree of a ray digital image and its application
  • A method for determining the modulation degree of a ray digital image and its application
  • A method for determining the modulation degree of a ray digital image and its application

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Experimental program
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Embodiment

[0088] The specific implementation method is as follows.

[0089] Such as figure 1 As shown, read the image under test according to the method flow; select the linear area to be measured in the image under test such as figure 2 As shown, and read the pixel grayscale data of the linear area.

[0090] According to the preset background threshold, the read pixel grayscale data is divided into background point set G and foreground point set NG, such as image 3 shown; according to the preset gray threshold, the foreground point set NG is divided into point set H0 and point set L0, such as Figure 4 shown.

[0091] Calculate the gray change rate of point set H0 and point set L0 point by point, and use point set H0 and point set L0 respectively to generate new point sets H1 and L1 according to the preset gray level change rate threshold, as shown in Figure 5 shown.

[0092] The H1 point set is averaged to obtain the high gray level average H1avg, and the L1 point set is aver...

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Abstract

The invention relates to a method and application for determining the modulation degree of a digital ray image. Aiming at the problem of inconsistency between the subjective evaluation and the objective evaluation of the ray digital image obtained by detecting the printed board assembly with a micro-focus ray machine, the pixel edge of the recognized digital image is calibrated. , through the software transfer function algorithm, accurately identify the local image quality, and based on this method, the application criteria of image modulation degree Y and image comprehensive evaluation index y are given. The experimental results show that the image comprehensive evaluation index obtained by this method has a high degree of fitting with the subjective evaluation results, which can solve the problem of inconsistency between subjective judgment and objective judgment, and effectively avoid the disadvantages of manual subjective judgment of image quality.

Description

technical field [0001] The invention relates to a method for determining the modulation degree of a radiographic digital image and its application, and belongs to the field of radiographic digital image evaluation. Background technique [0002] The inspection of defects by ray inspection technology relies on the information given by the obtained inspection images. In addition, it is also related to the actual conditions of the test image, the ability and experience of the inspector to identify and test image information. Therefore, the ability of ray inspection technology to detect defects basically determines the quality of the obtained inspection image. Radiographic image resolution is an important parameter to evaluate the quality of radiographic images. The traditional image resolution is completed by manual observation, measurement, comparison with the pattern, etc., which has disadvantages such as long time, low efficiency, large evaluation deviation, and high requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/13G06T7/136G06T7/194G01N23/083
CPCG01N23/083G01N2223/04G01N2223/1016G06T7/0002G06T2207/30168G06T7/13G06T7/136G06T7/194
Inventor 齐亚欣陈嵩任驰姜晖刘卫兵王志才李伟刘少燕
Owner BEIJING AEROSPACE GUANGHUA ELECTRONIC TECH CO LTD
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