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A method for determining the modulation degree of a ray digital image and an application thereof are disclosed

A digital image and determination method technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve problems such as difficult identification, unsharp imaging results of superimposed layers of imaging images, poor repeatability, etc.

Inactive Publication Date: 2018-12-11
BEIJING AEROSPACE GUANGHUA ELECTRONIC TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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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 an application thereof are disclosed
  • A method for determining the modulation degree of a ray digital image and an application thereof are disclosed
  • A method for determining the modulation degree of a ray digital image and an application thereof are disclosed

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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 for determining the modulation degree of a ray digital image and an application thereof. Aiming at the problem that the subjective evaluation and objective evaluationof the X-ray digital images obtained by a micro-focus X-ray machine from PCB assemblies are inconsistent, the local image quality is accurately identified by calibrating the pixel edges of the recognized digital image and using the software transfer function algorithm. Based on this method, the application criteria of the image modulation degree Y and the image comprehensive evaluation index y are given. The experimental results show that the image comprehensive evaluation index and subjective evaluation result obtained by this method have high fitting degree, the problem of inconsistency between subjective judgment and objective judgment can be solved, and the drawbacks of artificial subjective judgment of image quality are effectively avoid.

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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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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