Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-08-18
1984-12-11
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
356 4, 356 45, 250236, H04N 718
Patent
active
044881720
ABSTRACT:
A range imaging system in which a moving periodic pattern is projected onto the scene to be imaged. The phase by which variations in range cause portions of the pattern to shift are monitored to develop range data. A television camera offset from the axis of illumination generates four frames of intensity values. The moving pattern shifts one-quarter cycle with respect to the pattern between each of the frames. The data from the third frame is subtracted from the first frame and the data from the fourth frame is subtracted from the data of the second frame to cancel the effects of background illumination. The first difference represents a sine signal and the second difference represents a cosine signal. The arc tangent of the quotient of these values represents the phase, and thus the relative range of various points in the image. The moving pattern can be generated by either a translating plate or rotating disk which has a periodic variation in transmissiveness. An ambiguity exists when a change in range causes the phase to shift by one complete cycle. By employing a second moving pattern projected on the scene with a larger spatial period, the range in which no ambiguity occurs can be increased.
REFERENCES:
patent: 3348050 (1967-10-01), Bez
patent: 3369445 (1968-02-01), Kohl
patent: 3485560 (1969-12-01), Gamertsfelder
patent: 3649754 (1972-03-01), Macovski
patent: 3799675 (1974-03-01), Johnson et al.
patent: 3866052 (1975-02-01), DiMatteo et al.
patent: 3879133 (1975-04-01), Mathieu
patent: 3943278 (1976-03-01), Ramsey, Jr.
patent: 3944821 (1976-03-01), Pierrat
patent: 3945729 (1976-03-01), Rosen
patent: 4145991 (1979-03-01), DiMatteo et al.
patent: 4159522 (1979-06-01), Zamoni
patent: 4240745 (1980-12-01), Green
patent: 4254433 (1981-03-01), Dewar, Jr. et al.
patent: 4259017 (1981-03-01), Ross et al.
patent: 4410787 (1983-10-01), Kremers et al.
Duda et al, "Use of Range and Reflectance Date to Find Planar Surface Regions", vol. PAMI-1, No. 3, Jul. 1979.
Nitzan et al, "The Measurement and Use of Registered Reflectance and Range Data in Scene Analysis", Proceedings of the IEEE, vol. 65, No. 2, Feb. 1977.
Nevatia et al, "Structured Descriptions of Complex Objects", Proc. 3rd Int. Joint Conf. Artificial Intelligence, Aug. 1973.
Shirai et al, "Recognition of Polyhedrons With a Range Finder", Proc. 2nd Int. Joint Conf. Artificial Intelligence, Sep. 1971.
Rocker et al, "Methods for Analyzing Three Dimensional Scenes", Proc. 4th Int. Joint Conf. Artificial Intelligence, Sep. 1975.
Britton Howard W.
Coles Edward L.
Novon, Inc.
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