1
Paul Vlahos, Arpag Dadourian, Petro Vlahos: Method and apparatus for inhibiting projection of selected areas of a projected image. iMatte, Blakely Sokoloff Taylor & Zafman, March 26, 2002: US06361173 (49 worldwide citation)

A video projector shows the desired scene on a projection screen. An infrared source close to the video projector uniformly floods the projection screen with non-visible infrared radiation. An infrared sensitive camera, also close to the video projector, observes the projection screen and sees only ...


2
Paul E Vlahos, Petro Vlahos, David F Fellinger: Automated encoded signal color image compositing. 501 Ultimatte Corporation, Blakely Sokoloff Taylor & Zafman, May 13, 1986: US04589013 (45 worldwide citation)

A method and apparatus to cause a colored backing to be replaced by a background scene, such that the composite scene shows no loss of detail, no edge anomalies, no evidence of a colored backing having been present, and no evidence that the final scene is a composite, even when the foreground scene ...


3
Petro Vlahos: Comprehensive electronic compositing system. Poms Smith Lande & Glenny, July 11, 1978: US04100569 (43 worldwide citation)

In a system for combining foreground video images with background video images, using the so-called "blue-screen" (or special background color) technique, a comprehensive control system is provided which accommodates a broader range of foreground objects, permits the careful coordination of control ...


4
Petro Vlahos: Comprehensive electronic compositing system. Vlahos Gottschalk Research, Poms Smith Lande & Rose, August 10, 1982: US04344085 (39 worldwide citation)

The linear foreground and background compositing system of the "blue-screen" type and as included in my prior U.S. Pat. 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 ...


5
Petro Vlahos: Comprehensive electronic compositing system. Ultimatte Corporation, Blakely Sokoloff Taylor & Zafman, November 25, 1986: US04625231 (35 worldwide citation)

In the present invention, certain improvements are incorporated that permit removal of the backing color when its illumination is of non-constant color. In addition, an improved color logic is described that improves the simultaneous reproduction of fleshtones and green foliage in the same scene. A ...


6
Petro Vlahos: Electronic composite photography with color control. The Association of Motion Picture and Television Producers, February 8, 1977: US04007487 (35 worldwide citation)

Improved electronic compositing procedures and apparatus are described, ed typically on the blue screen process and suitable for processing motion pictures of professional quality and the like. The invention provides compensation for color impurity in the backing illumination over a continuous range ...


7
Petro Vlahos: Encoded signal color image compositing. Vlahos Gottschalk Research, Harry R Lubcke, October 11, 1983: US04409611 (31 worldwide citation)

A linear color television compositing system of the "blue backing" type, in which the foreground signal channel is always open. The foreground and background channels are not switched by the edges of the pictorial subject matter.


8
Petro Vlahos: Backing color and luminance nonuniformity compensation for linear image compositing. Blakely Sokoloff Taylor & Zafman, July 16, 1991: US05032901 (28 worldwide citation)

A linear image compositing system which corrects for nonuniform luminance and/or color of the colored backing without incurring the penalties of edge glow, edge darkening, loss of edge detail and other anomalies. A control signal is created directly proportional to the luminance of the colored backi ...


9
Petro Vlahos, Paul Vlahos: Method for generating non-visible window edges in image compositing systems. Ultimatte Corporation, Blakely Sokoloff Taylor & Zafman, April 21, 1998: US05742354 (22 worldwide citation)

The invention is a method used with a system for compositing a foreground scene including a subject before a nonuniformly illuminated colored backing, and a background scene, and where the nonuniformity is nonlinear from side to side and/or nonlinear from top to bottom. A window is employed to mask ...


10
Petro Vlahos: Backing color and luminance nonuniformity compensation for linear image compositing. Ultimatte Corporation, Blakely Sokoloff Taylor & Zafman, June 13, 1995: US05424781 (21 worldwide citation)

A linear image compositing system which corrects for nonuniform luminance and/or color of the colored backing without incurring the penalties of edge glow, edge darkening, loss of edge detail and other anomalies. A control signal is created directly proportional to the luminance of the colored backi ...