A method for improving the quality of images used in digital radiographic testing

Mitsutoshi Kobayash, Atsushi Taniguchi, Kaoru Sakai, Masako Mori, Kenichi Kawai, Yoshimitsu Aoki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Owing to recent developments in digital imaging technology, digital radiographic testing (RT) using computed radiography (CR) has begun to replace film RT in the inspection of piping at nuclear power plants. Digital RT enables inspection records to be preserved almost permanently without degradation and improves the efficiency of inspection by supporting inspectors using various image processing techniques. Defects can be quickly and reliably detected by applying image processing techniques such as image expansion and contrast adjustment. In addition, fluctuations in measured defect size are minimized due to quantitative evaluation using the image data. In the present paper, a method for improving the image quality of digital RT images, which is generally inferior to that of film (analog) images, is proposed in order to improve the practicality of digital RT. In this method, denoising via wavelet shrinkage and deblurring using the point spread function (PSF) estimated from image data are applied in order to accentuate the detection target in a noisy image and to improve the resolution. The enhancement of image quality is evaluated experimentally using digital RT images of a specimen with a small hole and duplex wire image quality indicator (IQI). As a result, the proposed method is confirmed to improve the quality of images with respect to noise and visibility. In particular, the visibility of the duplex wire IQI is 1.7 times.

    Original languageEnglish
    Title of host publication2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference, ICONE 2012-POWER 2012
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Pages233-239
    Number of pages7
    ISBN (Print)9780791844953
    DOIs
    Publication statusPublished - 2012 Jan 1

    Publication series

    NameInternational Conference on Nuclear Engineering, Proceedings, ICONE
    Volume1

    Keywords

    • Digital radiographic testing
    • Duplex wire gauge
    • IQI
    • Image quality improvement
    • Piping

    ASJC Scopus subject areas

    • Nuclear Energy and Engineering

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