Abstract
A method of camera focusing based on fringe pattern matching is presented. In the method, the variance of the mismatch function is used as a focus measure. The focus measure was examined in a fringe analysis system, and the results from the three well-known focus measures—gray-level variance, image gradient, and Laplacian—were also obtained in the experiment as a comparison. The experimental results show that the focus measure based on fringe pattern matching performs well in peak sharpness, monotonicity, and noise sensitivity and that it has a better performance in noise sensitivity owing to its advantage of averaging noise.
© 1997 Optical Society of America
Full Article | PDF ArticleMore Like This
Douglas R. Schmitt and R. W. Hunt
Appl. Opt. 36(34) 8848-8857 (1997)
Jun-ichi Kato, Ichirou Yamaguchi, Toru Nakamura, and Shigesumi Kuwashima
Appl. Opt. 36(32) 8403-8412 (1997)
Noe Alcalá Ochoa, Fernando Mendoza Santoyo, Andrew J. Moore, and Carlos Pérez López
Appl. Opt. 36(13) 2783-2787 (1997)