Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-11-03
1976-10-19
Britton, Howard W.
Telegraphy
Systems
Simplex-reversing periodic
178DIG34, 355 52, H04N 718
Patent
active
039872432
ABSTRACT:
Combined optical and electronic apparatus provide for various types of image enhancement by producing two images of the same scene which differ by a predetermined property, and by electronically subtracting the images to yield a video difference signal which emphasizes or deemphasizes a predetermined characteristic of the scene at which the apparatus is pointed. Various types of image enhancement are obtained by simultaneous scanning of the images produced by two imaging systems in which a relative difference in properties between the images such as deliberate misalignment, optical density difference, image resolution, image magnification or image receptor displacement is introduced to create a particular type of enhancement. The intensities from pairs of scanned spots are subtracted on a point-by-point basis to yield a video difference signal which when displayed provides an image enhanced in a particular manner. Property differences are in general introduced in the aperture plane, at the optics or in the image plane. The subject system can be arranged for edge enhancement, size discrimination, emphasis of lines in a predetermined direction, peripheral image enhancement, and central image or boresite enhancement. This system is particularly useful in clutter rejection for TV-based target tracking systems.
REFERENCES:
patent: 3366735 (1968-01-01), Hecker
patent: 3786186 (1974-01-01), Thomas
patent: 3883436 (1975-05-01), Fletcher
Britton Howard W.
Etlinger Louis
Sanders Associates Inc.
Tendler Robert K.
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