H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/38, 350/41,
H04N 9/75 (2006.01)
Patent
CA 1170578
45-191F IMPROVED COMPREHENSIVE ELECTRONIC COMPOSITING SYSTEM Abstract of the Disclosure The linear foreground and background comprising system of the "blue-screen" type and as includes in ?y prior U. S. Patent No. 4,100,569 is provided with non-linear background control signals for improved composite picture quality under various adverse circumstances. More particularly, the problem of footprints, scuff marks, and dust on the "blue-screen" background for the foreground signal has been eliminated by a "clean-up" circuit which shifts the background signal to "fully on" when it reaches a level in the vicinity of 80 or 90 percent "on", and making a concurrent reduction in the foreground signals, so that above the selected control level shadows or semi-transparency objects are made fully transparent and are not reproduced. The problem of "print-through" in the case of glossy black objects has been avoided by reducing the background signal to zero when the level of blue foreground signals drops below a predetermined level. The problem of shadow inversion and high noise level which may arise when forground objects are subject to back lighting has been solved by the use of a dual control signal, one operating in the blue backing area, and the second operating in the subject area. An improved signal control for increasing or decreasing the intensity of shadows provides a continuously variable shadow control for bowing the background signal level characteristic, either upward or downward throughout its complete control range. Special circuitry is also provided for accommodating black background, or white backgrounds, so that special effects involving black backgrounds or foreground cartoon pictures having white background may be easily handled.
391071
Smart & Biggar
Vlahos-Gottschalk Research Corporation
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