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Research Papers: NDE

Image Fusion for Infrared Thermography and Inspection of Pressure Vessel

[+] Author and Article Information
Yu-Peng Tian, Xiaowei Feng, Sheng-Lin Yu

Department of Measuring and Testing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Ke-Yin Zhou

Department of Structural Engineering and Mechanics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Hua Liang, Bing Liang

 Nanjing Boiler and Pressure Vessel Supervision and Inspection Institute, Nanjing 210001, China

J. Pressure Vessel Technol 131(2), 021502 (Jan 22, 2009) (5 pages) doi:10.1115/1.3066801 History: Received October 07, 2007; Revised March 13, 2008; Published January 22, 2009

Infrared thermography is a nondestructive evaluation method with an increasing span of applications. In this paper the pixel-level image fusion of infrared light and visible light image for infrared thermography and its application in nondestructive testing (NDT) of pressure vessel are studied. First in the image fusion, different mode image registration has been done based on feature corners. The corners and curves relative to each corner are extracted using the curvature scale space method. A new shape context descriptor for each corner is computed as the criterion to match the corners. Marks can then be added to pick up the corners, especially if there are no distinct matching feature corners between the different mode images. Two fusion methods, contrast modulation and transparent fusion, are introduced to fuse the visual and infrared light images. The experimental results show that the methods are good for pixel-level image fusion. Finally the method is applied to inspection of pressure vessel. The research indicates that image fusion for infrared thermography can facilitate defect location and interpretation of inspection results.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

The flow diagram of matching method

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Figure 2

Original infrared (left) and visual (right) light images

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Figure 3

Diagram of the shape content descriptor

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Figure 4

Matching point set between the infrared and visual light images

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Figure 5

Fusion gray image using contrast modulation

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Figure 6

Fusion color image using transparency method for pressure vessel inspection

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Figure 7

Image mosaic for pipeline inspection

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