Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-06-24
1986-12-02
Griffin, Donald A.
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 906
Patent
active
046269193
ABSTRACT:
Apparatus is disclosed for de-emphasizing low spatial frequencies in a two-dimensional optical imaging system. The apparatus (10) includes a source of incoherent light (12) adapted to be directed toward a source of optical information (14); first (17) and second (19) coplanar strips of pupils (16, 18) for transmitting light from the source of optical information (14), the strips (17, 19) being parallel to one another, the pupils (16) of the first strip being randomly distributed therein and circular in shape, the pupils (18) of the second strip being randomly distributed therein and ring shaped; a lens system (20) positioned to focus light passing through the strips (17, 19) of pupils (16, 18) onto an output plane (22); and a Ronchi grating (24) positioned between the lens (20) system and the output plane (22) and parallel thereto at a distance from the output plane (22) such as to provide interlacing of the images through the two strips of pupils, the grid lines (25 ) of the grating being parallel to the strips (17, 18) of pupils.
REFERENCES:
patent: 4100570 (1978-07-01), Nobutoki et al.
patent: 4178611 (1979-12-01), Okano
patent: 4539584 (1985-09-01), Otake
patent: 4554585 (1985-11-01), Carlson
patent: 4575193 (1986-03-01), Greivenkamp
Low Frequency De-Emphasis of the Modulation Transfer Function, I, One Dimensioned Case, Optical Communications, vol. 41, p. 388 (1982) N. Konforti and E. Marom.
Optical Processing of One-Dimensional Signals, Optics Communications, vol. 42, p. 87, (1982), H. Bartelt and L. W. Lohmann.
Two-Step Incoherent Optical Method for the Realization of a Rho Filter, Optics Letters, vol. 8, p. 587 (1983), C. Han & K. Murata.
Low Frequency De-Emphasis of the Modulation Transfer Function, II, Two-Dimensional Case, Proceedings of the Tenth International Optical Computer Conference, p, 214, Apr., 1983, Boston, Mass., N. Konforti and E. Marom.
Bipolar Pointspread Function Synthesis by Phase Switching, Applied Optics, Feb. 1977, vol. 16, No. 2, W. T. Rhodes.
Rapid Communications, Applied Optics, Feb. 1977, vol. 16, No. 2, by A. W. Lohmann, Incoherent Optical Processing of Complex Data.
Griffin Donald A.
Hughes Aircraft Company
Karambelas A. W.
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