Randomly oriented microbiological patterns are recognized by rotating a matched spatial filter with an optical wedge prism. The filter is made from a composite input pattern with various sized objects to cover wider ranges of size variation in a species to be identified.
© 1980 Optical Society of America
Hitoshi Fujii, Silverio P. Almeida, and James E. Dowling, "Rotational matched spatial filter for biological pattern recognition," Appl. Opt. 19, 1190-1195 (1980)