Inspection and profiling of moving objects using a TDI camera

M. R. Sajan; Cho Jui Tay; Huai Min Shang; Anand Krishna Asundi

doi:10.1117/12.269877

20 March 1997 Inspection and profiling of moving objects using a TDI camera

M. R. Sajan, Cho Jui Tay, Huai Min Shang, Anand Krishna Asundi

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269877
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

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.

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M. R. Sajan, Cho Jui Tay, Huai Min Shang, and Anand Krishna Asundi "Inspection and profiling of moving objects using a TDI camera", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269877

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KEYWORDS

Inspection

Cameras

Sensors

Moire patterns

Profiling

Fourier transforms

Modulation

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