Image processing system using incoherent radiation and spatial f

Details Image processing system using incoherent radiation and spatial f Image processing system using incoherent radiation and spatial f

1976-04-01

1978-04-04

Stern, Ronald J.

Boots, shoes, and leggings

350205, 364515, 364825, 364827, G02B 532, G02B 2738, G03H 116

Patent

active

040824314

ABSTRACT:
A linear optical processing system in which a spatial filter in the form of a Fourier transform hologram is included with a lens for processing incoherent electromagnetic radiation. Such a system provides a given real, two-dimensional transfer function for spatially filtering incoherent radiation within a range of spatial frequencies 0 .ltoreq..omega..ltoreq..OMEGA.. The filter is made by forming a mask of a graph of a point spread function which is the inverse transform of the desired transfer function, and employing the mask in a coherent system to produce a Fourier transform hologram of the mask. Spatial filters are designed for providing the resultant systems with various transfer functions, including (a) a directional response for passing substantially higher spatial frequency components in a first direction than are passed in a second direction; (b) a selective attenuator response; (c) a notch filter response; (d) a correctional filter response; and (e) a linear minimum mean square error response. The systems are useful for recognizing specified patterns from a plurality of patterns and for determining the concentration of a species of particulate matter having a predetermined specific pattern within a sample of particles.

REFERENCES:
patent: 337068 (1968-02-01), Dobrin et al.
Lanzl et al, Optik, vol. 35, No. 5, 1972, pp. 524-535.
Lowenthal et al, Comptes Rendus Acad. Sc.Paris, Series B, vol. 266, Feb. 1968, pp. 542-545.
Caulfield, Applied Optics, vol. 13, No. 5, May 1974 pp. 996-997.
Goodman, Introduction To Fourier Optics, McGraw-Hill Book Co., 1968 pp. 165-166.

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