Generation of arbitrary moire contours for automated inspection

Bernard R. Gilbert; Joel H. Blatt

doi:10.1117/12.169359

15 March 1994 Generation of arbitrary moire contours for automated inspection

Bernard R. Gilbert, Joel H. Blatt

Proceedings Volume 2065, Optics, Illumination, and Image Sensing for Machine Vision VIII; (1994) https://doi.org/10.1117/12.169359
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

We have developed a method of creating arbitrary moire patterns from any arbitrary diffusely reflecting object that does not require any physical grating fabrication. The moire patterns can be made in any form, from equal depth contours, to error maps, to any pattern that would aid in automated or machine aided inspection or sorting. We first generate the desired output moire pattern, either in the computer or by capturing the image of the desired pattern. We then use a Michelson interferometer to generate and project variable spatial frequency gratings on the perfect target and capture the image of these distorted gratings. We next compute the shape of a filter (transmission or viewing) grating that would cause the desired output from the perfect target input. The computer filter shapes are then converted to NTSC composite video and mixed with the video signal from the target camera. If the target seen matches the perfect target, the desired moire output pattern is produced.

Citation Download Citation

Bernard R. Gilbert and Joel H. Blatt "Generation of arbitrary moire contours for automated inspection", Proc. SPIE 2065, Optics, Illumination, and Image Sensing for Machine Vision VIII, (15 March 1994); https://doi.org/10.1117/12.169359

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