Optics: image projectors – Composite projected image
Patent
1986-02-18
1986-12-16
Haroian, Harry N.
Optics: image projectors
Composite projected image
353 28, 353 84, G03B 2126
Patent
active
046292985
ABSTRACT:
The present invention provides a projector having particular application for use in front projection composite photographic systems. In particular, the present invention relates to composite color photography, whether still, motion picture, or video in which foreground and background scenes are separately recorded and subsequently combined, using known "blue screen" or special background color techniques, to form a single image. The present invention includes a high pressure, short arc, mercury-xenon lamp in an optical system to produce a high intensity beam at wavelengths of either: 436 n.m. (blue); 545 n.m. (green); 589 n.m. (yellow) or 650+ n.m. (red). The selected color beam is then manipulated by optical elements into close correspondence to the viewing angle of a camera lens, and made coincident with the camera view by means of a beam splitter. Unwanted light is removed from the system through a "light trap" which traps and systematically absorbs incident light. The projected beam proceeds along the axis of the camera view to a retro-reflective projection screen, and returns therefrom along the same axis to the camera lens. Foreground subject matter interposed between the camera and the retro-reflective screen will therefore be combined with the image on the screen of the predetermined color, for subsequent compositing by methods known to the art.
REFERENCES:
patent: 2336508 (1943-12-01), Smith et al.
patent: 3350980 (1967-11-01), Margolin
patent: 4018519 (1977-04-01), Clapp
patent: 4488207 (1984-12-01), Harmon
patent: 4497013 (1985-01-01), Ohta
patent: 4497015 (1985-01-01), Konno et al.
Burke Paul
Erland Jonathan
Fog Stephen
Trumbull Donald
Apogee, Inc.
Blatt Jeffrey J.
Haroian Harry N.
Sokoloff Blakely
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