Producing smooth edge transitions in displayed composite images

H - Electricity – 04 – N

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H04N 9/31 (2006.01) H04N 5/74 (2006.01)

Patent

CA 2409898

An apparatus (Fig. 4) for producing smooth light-intensity transitions in overlapping regions of a composite image projected by a plurality of electrically-controlled projectors (41,42) and displayed on a screen by disposing shadowing devices (46,47) between each projector and the screen to cast gradual shadow in the overlapping regions to reduce light-intensity variations therein; and electrically controlling the gain of the projectors (48a,48b,49) to substantially eliminate any residual variations in light- intensity in the overlapping regions.

L'invention concerne un procédé et un appareil permettant de produire des transitions d'intensité lumineuse harmonieuses dans les zones de recouvrement d'une image composite projetée par une pluralité de projecteurs à commande électrique et affichée sur un écran. Ledit procédé consiste à disposer des dispositifs d'atténuation entre chaque projecteur et l'écran pour produire une atténuation graduelle dans lesdites zones de chevauchement, de manière à réduire les variations d'intensité lumineuses entre ces zones ; et à commander électriquement le gain des projecteurs pour éliminer sensiblement toute variation résiduelle de l'intensité lumineuse dans les zones de chevauchement.

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