Traditional radiography is a non-destructive inspection (NDI) process widely used for the detection of cracks and damage in aircraft structures. However a significant limitation is that it relies on visual assessment by the operator for identification of defects from the radiographic image. Digital radiography allows all the benefits of producing significant increases in magnification and image clarity, as well as efficient management of digital images. Image enhancement allows more accurate interpretation of digital radiography indications. In this paper, we proposed using wavelet thresholding, Gamma correction and contrast limited adaptive histogram equalization to enhance digital radiographic images for inspection of the aircraft. The comparative analysis between the proposed methods and currently frequently used methods has showed the effectiveness of these methods. The wavelet thresholding technique can remove the image noise while keep the sharpness of defects edges well. Gamma correction and CLAHE not only improved the local contrast of the radiographic images but also reduced the noise produced in homogeneous areas. These are used to eliminate noise and background artifacts and to smooth sharp edges, but also tend to remove some of the detail in small objects.


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    Title :

    Image enhancement for radiographic non-destructive inspection of the aircraft


    Additional title:

    Bildverbesserung bei der radiographischen zerstörungsfreien Prüfung von Flugzeugen


    Contributors:
    Wang, X. (author) / Wong, B.S. (author) / Tui, C.G. (author) / Khoo, K.P. (author) / Foo, F. (author)


    Publication date :

    2006


    Size :

    6 Seiten, 12 Bilder, 1 Tabelle, 11 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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