Virginia TechFujii, H.Almeida, S. P.2014-04-042014-04-041979-11Hitoshi Fujii and Silverio P. Almeida, "Coherent spatial filtering with simulated input," Appl. Opt. 18, 1659-1662 (1979). doi: 10.1364/ao.18.0016590003-6935http://hdl.handle.net/10919/46880A disadvantage of a well-tuned matched filter is partly overcome in recognizing biological species, i.e., algae. A simplified input pattern is prepared which simulates a given species. The matched spatial filter for this pattern can identify various diatoms in the species with considerably less size and orientation dependence. In addition, the filter still retains a high degree of pattern discrimination against other species.en-USIn CopyrightArticle - Refereedhttp://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-18-10-1659https://doi.org/10.1364/ao.18.001659