Apparatus for copying graphic images including the processing of

Details Apparatus for copying graphic images including the processing of Apparatus for copying graphic images including the processing of

1976-06-25

1978-04-04

Stern, Ronald J.

350 382, 350205, G02B 532, G02B 2738, G03H 116

Patent

active

040824292

ABSTRACT:
A linear optical processing system for copying graphic images which includes a spatial filter in the form of a Fourier transform hologram together with a lens for processing incoherent electromagnetic radiation. The system provides a given real, substantially-uniform low-pass two-dimensional optical transfer function for spatially filtering incoherent radiation within a range of spatial frequencies 0<.omega.<.OMEGA.. The spatial filter is made by forming a mask representing a point spread function which is the inverse transform of the desired optical transfer function, and employing the mask in a coherent system to produce as the filter a Fourier transform hologram of the mask.
The spatial filter operates on light distributed from an object containing a graphic image illuminated by incoherent light and provides a substantially-uniform low-pass response for passing all spatial frequency components within an interval of spatial frequencies above zero spatial frequency extending to a specified cutoff spatial frequency .omega..sub.c. The filter interacts with the lens to provide processed convolution and/or correlation images of such filtered light at a predetermined image plane to provide a graphic image of the object at the image plane in which higher spatial frequencies, within the interval, the reduction of which contribute to degradation or loss of fidelity in multigeneration copies, are substantially unaltered. In one embodiment, the spatial filter provides a plurality of discrete optical transfer functions for respectively filtering a plurality of discrete color components.

REFERENCES:
patent: 3370268 (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.
Goodman, Introduction To Fourier Optics, Mc Graw-Hill Book Co., 1968, pp. 165-166.

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