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Proceedings Paper

Inspection and profiling of moving objects using a TDI camera
Author(s): M. R. Sajan; Cho Jui Tay; Huai Min Shang; Anand Krishna Asundi
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Paper Abstract

Dynamic inspection of moving objects is a significant task in industrial machine vision systems. Time Delay and Integration (TDI) cameras are being used in some industries for solving problems encountered while using conventional CCD cameras for imaging moving objects. The CCD camera which works in TDI mode is equivalent to a digital drum camera providing possibilities for dynamic inspection on moving objects (either rotating or translating on industrial platforms). Here we report some advances in the application of TDI cameras for inspection and profiling of moving objects. The method is based on the conventional light projection systems which is widely used in industries. The TDI system generates an on-line scanning moire display which could assist operators to identify defects on objects such as dents. Conventional projection systems use mechanical or interferometric type of fringe projections, which is not desirable in the industrial environment. The TDI system makes use of temporal modulation of the projected light which could be easily controlled by a PC or by the output ports in vision systems. In addition to the details of system implementation, we also describe two algorithms for unwrapping the deformation or shape profile of the test object based on fast Fourier transform and sinusoidal fitting on the recorded patterns.

Paper Details

Date Published: 20 March 1997
PDF: 8 pages
Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); doi: 10.1117/12.269877
Show Author Affiliations
M. R. Sajan, National Univ. of Singapore (Singapore)
Cho Jui Tay, National Univ. of Singapore (Singapore)
Huai Min Shang, National Univ. of Singapore (Singapore)
Anand Krishna Asundi, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 2921:
International Conference on Experimental Mechanics: Advances and Applications

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