Defocused white light speckle method for object contouring

Anand Krishna Asundi

doi:10.1117/12.25362

1 March 1991 Defocused white light speckle method for object contouring

Anand Krishna Asundi

Proceedings Volume 1385, Optics, Illumination, and Image Sensing for Machine Vision V; (1991) https://doi.org/10.1117/12.25362
Event: Advances in Intelligent Robotics Systems, 1990, Boston, MA, United States

Abstract

White light speckles observed when the object is coated with retroreflective paint and illuminated by an ordinary slide projector or other white light source are used for object contouring using the defocus effect. Due to a defocussed recording of the speckles on the object it is seen that the high frequency components of the speckles are eliminated due to the enlarged size of speckles. A suitable filter on the Fourier plane of a single exposed speckle pattern of a curved object can deli neate the regions above and below the cutoff frequency as dark and bright areas respectively. A digital counterpart of this effect is also demonstrated.

Citation Download Citation

Anand Krishna Asundi "Defocused white light speckle method for object contouring", Proc. SPIE 1385, Optics, Illumination, and Image Sensing for Machine Vision V, (1 March 1991); https://doi.org/10.1117/12.25362

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