Method for analyzing periodic brightness patterns

Details Method for analyzing periodic brightness patterns Method for analyzing periodic brightness patterns

1992-06-15

1994-08-30

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

250237G, G01B 900

Patent

active

053432940

ABSTRACT:
The present invention relates to a method for evaluating fringe images, in particular, for topographic measurements. During a first step, several phase-displaced patterns are recorded sequentially in time, and the respective phase relations of these patterns are determined by evaluation in the spatial domain (14a, 14b, 15). During a second step, after the phase shifts have been determined accurately in this manner based on the video images themselves, a pixel-by-pixel evaluation of the phase-displaced pattern is performed in the time domain. The invention also includes computer hardware for performing the evaluation of the strip images in video real time.

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