Abstract
The quantitative measurement of the positions and diameters of steel reinforcements in buildings is based on the concept of non-linear backprojection (NLBP). Advantages are 3D-image reconstructions from a small number of views, fast numeric algorithms and the consideration of the statistical, spectral and other characteristics of the object. For the radiographic inspection a 60Co source was used and both X-ray films and imaging plates for detection. The imaging plates were combined with special filter screens for contrast optimization. The digitized images from the plates have a high dynamic range and can be read into a computer without a photographic developing process. A numerical preprocessing procedure was developed as space filtering in different directions followed by a combination of the image angle components. A generalized Hough or Radon transformation and a statistical evaluation of the resulting image was employed. The special advantage of this method is the reconstruction of direction-selective structures.
Original language | English |
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Pages (from-to) | 243-248 |
Number of pages | 6 |
Journal | NDT and E International |
Volume | 30 |
Issue number | 4 |
Publication status | Published - Aug 1997 |
Keywords
- Non-linear backprojection
- Tomography
- Tomosynthesis
ASJC Scopus subject areas
- Engineering(all)
- Mechanical Engineering