Apparatus and method for image sampling

Details Apparatus and method for image sampling Apparatus and method for image sampling

1976-04-29

1978-08-08

Corbin, John K.

350162R, G02B 518

Patent

active

041052897

ABSTRACT:
A method and apparatus for receiving optical radiation representative of a scene and for generating a processed image having periodic spatial amplitude modulations; i.e., a sampled image which does not suffer substantial loss of overall illumination. In accordance with the invention there is provided a means for generating a plurality of ordered images of the scene, at least one of the ordered images being out of phase with respect to the other ordered images. Phase shift means are provided for imparting a phase shift to said at least one ordered image so that it is substantially in phase with respect to the other ordered images. Focusing means are provided for collecting the ordered images to obtain the processed image. In the preferred embodiment of the invention the plurality of ordered images are substantially non-overlapping. In this embodiment, the means for generating a plurality of ordered images includes a phase grating and a lens adjacent the phase grating. Also, in this embodiment the phase shift means comprises a phase retarding plate which is operative to impart a phase shift to the zero order.

REFERENCES:
patent: 3529887 (1970-09-01), Sun Lu
patent: 3540797 (1970-11-01), Glenn, Jr.
patent: 3571603 (1971-03-01), Bryant et al.
patent: 3772976 (1973-11-01), Stroke
patent: 3940788 (1976-02-01), Abe et al.
Rukman et al., "Obtaining Holograms with an Incoherent Light Source," ZhETF Pis., vol. 8, No. 10, Nov. 1968, pp. 538-540.
Bryngdahl, "Optical Map Transformations," Optics Communications, vol. 10, No. 2, Feb. 1974, pp. 164-168.

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