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A multi-objective optimization infrared thermal image defect feature extraction method based on homogeneous evolution

A multi-objective optimization and feature extraction technology, used in image enhancement, image analysis, image data processing, etc., can solve the problem of similarity between temperature points that have not been studied and similar temperature points, inaccuracy, incomplete information representation, etc. question

Active Publication Date: 2019-04-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

In this process, the representative temperature points of each category are obtained by using the correlation between different categories, but the similarity between the representative temperature points and the same temperature points is not studied, and the selected representative temperature points are not enough to characterize the characteristics of this category, so Goals that need to consider both differences and similarities
In addition, the method is to search for a regionally representative thermal response temperature point in each category, which is the distance from other cluster centers and the largest thermal response data in the corresponding category, and the thermal response data of the representative temperature points of all categories The response data constitutes a two-dimensional matrix, and these representative temperature points are incomplete for the information representation of the corresponding category, so the defect features extracted after linear transformation are inaccurate, thus failing to achieve a certain accuracy

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  • A multi-objective optimization infrared thermal image defect feature extraction method based on homogeneous evolution
  • A multi-objective optimization infrared thermal image defect feature extraction method based on homogeneous evolution
  • A multi-objective optimization infrared thermal image defect feature extraction method based on homogeneous evolution

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[0146] In this embodiment, there are two kinds of defects on the test piece, namely defect 1 not filled with any material and defect 2 filled with material with poor thermal conductivity.

[0147] In this embodiment, the results of classifying the selected transient thermal responses using fuzzy C-means clustering are shown in figure 2 shown.

[0148] Three known temperature points are directly extracted from the thermal image sequence of the specimen, namely, the transient thermal response curves of the temperature point of the material itself, the temperature point of defect 1, and the temperature point of defect 2, respectively denoted as Bac POINT, Def1 POINT and Def2 POINT, such as image 3 , 4 , 5 shown.

[0149] Using the existing method of selecting transient thermal response representatives based on differences, three transient thermal response representatives are obtained: A NFCM 12 , B NFCM 3 as well as c NFCM 50 , they respectively correspond to the tem...

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Abstract

The invention discloses a multi-objective optimization infrared thermal image defect feature extraction method based on homogeneous evolution. The transient thermal response of a pixel point is selected by changing the step length of a thermal image sequence; FCM is used for classification. obtaining the category of the transient thermal response of each pixel point; secondly, considering the pixel value (temperature value) similarity of each type of pixel points and the same type of pixel points; meanwhile, considering the difference between the pixel point (temperature point) and different types of pixel points (temperature points), constructing a corresponding multi-objective function, obtaining a dimension reduction result of the thermal image sequence by utilizing a decomposition-based homoevolution multi-objective evolution algorithm, and finally, carrying out feature extraction by utilizing a pulse coupling neural network so as to extract defect features of the infrared thermalimage. Through the uniform evolution direction of the solution, the difference and the similarity are comprehensively considered, accurate selection of representative pixel points (temperature points)is realized, and the accuracy of defect feature extraction is ensured.

Description

technical field [0001] The invention belongs to the technical field of defect detection, and more specifically relates to a uniform evolution-based multi-objective optimized infrared thermal image defect feature extraction method. Background technique [0002] Infrared thermal image detection technology obtains structural information on and below the surface of the material by controlling the thermal excitation method and measuring the temperature field change on the surface of the material, so as to achieve the purpose of detection. When acquiring structural information, infrared thermal imaging cameras are often used to record the temperature field information of the surface or subsurface of the specimen over time, and convert it into a sequence of thermal images for presentation. Due to the huge amount of data and strong noise interference of the thermal image sequence obtained by the infrared thermal imager, in order to obtain better detection results, it is necessary to...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06N3/00G06K9/62
CPCG06N3/006G06T7/0002G06T2207/10048G06F18/23
Inventor 殷春薛婷程玉华黄雪刚张昊楠石安华陈凯
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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