Abstract

Coherent optical spatial filtering is used to generate 2-D random patterns for use in studies of image noise perception. Some of the problems encountered are: small filter dimensions due to low spatial frequencies required; obtaining a noise source with a suitable Wiener spectrum; and the nonlinearity of the recording process. A procedure that overcomes these difficulties is discussed, and an example using a circularly symmetric bandpass filter is presented.

© 1979 Optical Society of America

Coherent spatial filtering with simulated input

Hitoshi Fujii and Silverio P. Almeida
Appl. Opt. 18(10) 1659-1662 (1979)

Bipolar incoherent optical pattern recognition by carrier encoding

Alan Furman and David Casasent
Appl. Opt. 18(5) 660-665 (1979)

Pattern recognition with wavelength-multiplexed filters

S. K. Case
Appl. Opt. 18(12) 1890-1894 (1979)

Multispectral size-averaged incoherent spatial filtering

S. P. Almeida, S. K. Case, and W. J. Dallas
Appl. Opt. 18(23) 4025-4029 (1979)

Flexible bandpass filtering using a coherent optical feedback technique

E. Händler and U. Röder
Appl. Opt. 18(16) 2787-2791 (1979)