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Proceedings Paper

Intensity-based image processing method for surface contouring and NDT
Author(s): G. Subramaniam; S. Radhakrishnan
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Paper Abstract

The total amount of light reflected by any portion of a smooth mirror-like surface remains the same before and after deformation. From this observation, if two intensity records of images reflected from the surface of a plate before and after loading are available, the shift of any image point due to loading is estimated by an intensity integration technique (IIT). This enables mapping of surface slope and curvature for the entire plate. The experimental values for slope and mean values for curvature by this technique agree to within 8 - 10% of the theoretical values. If the plate contains a defect the local values of curvature vary sharply. The intensity can be shown related directly to curvature and so the intensity record of the loaded defective plate displays noticeable abrupt changes in the region of defect, thus opening up possibilities for Non-Destructive Testing (NDT).

Paper Details

Date Published: 20 March 1997
PDF: 6 pages
Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); doi: 10.1117/12.269873
Show Author Affiliations
G. Subramaniam, Indian Institute of Technology (India)
S. Radhakrishnan, Indian Institute of Technology (India)

Published in SPIE Proceedings Vol. 2921:
International Conference on Experimental Mechanics: Advances and Applications
Fook Siong Chau; C. T. Lim, Editor(s)

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