Method and apparatus for image subtraction in order to extract n

Details Method and apparatus for image subtraction in order to extract n Method and apparatus for image subtraction in order to extract n

1980-12-12

1983-07-05

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358111, 356393, 356239, 250237G, H04N 718

Patent

active

043921558

ABSTRACT:
Apparatus for image subtraction in order to extract non-common information from two light images comprises a TV camera tube including a photosensitive coating on its inner face and a grating on its outer face spaced from the photosensitive coating by the thickness of the tube; projectors for projecting the two light images simultaneously, from slightly different angles, onto the photosensitive coating via the grating such that the shadow of the grating interlaces the two light images on the photosensitive coating; and a scanner for electronically scanning the interlaced images on the photosensitive coating to produce a video output, and for processing same to select only the image information which is non-common to the two optical images.

REFERENCES:
patent: 3114797 (1963-12-01), Williams
patent: 3952150 (1976-04-01), Gerardin et al.

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