Digital filters for surface shape recovery from phase-modulated structured light

K. C. Yow; Clifford Allan Hobson; Jeremy David Pearson

doi:10.1117/12.269834

20 March 1997 Digital filters for surface shape recovery from phase-modulated structured light

K. C. Yow, Clifford Allan Hobson, Jeremy David Pearson

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269834
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

A rarely used fringe demodulation method which uses similar technique to phase demodulation in satellite communications is demonstrated in this paper. The processing is done in the space domain utilizing zero phase digital filters. In this paper, a recursive pole-zero placement digital filter design method has been employed, and the filters have been applied to both 1-D simulated signals and real 2-D images. The results are explained and suggestions to further improve either the quality or speed of the method are also presented. Two methods of producing zero-phase digital filters are explained which is important in preserving the integrity of an image. Theoretical derivation and detailed analysis of the demodulation method and filter design are presented. Images are included as to give a better understanding of the approach. Finally, comments, improvements and comparisons of the method are included.

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K. C. Yow, Clifford Allan Hobson, and Jeremy David Pearson "Digital filters for surface shape recovery from phase-modulated structured light", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269834

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KEYWORDS

Digital filtering

Linear filtering

Demodulation

Optical filters

Modulation

Bandpass filters

Image filtering

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