Video editing systems with allowable range for key signal set by

Details Video editing systems with allowable range for key signal set by Video editing systems with allowable range for key signal set by

1985-07-05

1987-05-19

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, H04N 975

Patent

active

046672214

ABSTRACT:
A system for combining two or more video signal inputs using a chrome key like system. The keying is not done to one color, such as saturated blue, but to any color within a range. One of the video signal inputs (1) is frozen and appears as a still picture on a display (6). Graphic means (16) are used to define an area of the picture and the maximum and minimum values of the color components of the signals in that area are detected. Whenever a signal with components falling within the detected range is present in a switch (14) it operates to select a channel for output. This works to build up a composite picture.

REFERENCES:
patent: 3832485 (1974-08-01), Pieters
patent: 4240104 (1980-12-01), Taylor et al.
patent: 4258385 (1981-03-01), Greenberg et al.
patent: 4292649 (1981-09-01), Macheboeuf
patent: 4394680 (1983-07-01), Watanabe
patent: 4413273 (1983-11-01), Wischermann
patent: 4484230 (1984-11-01), Pugsley
patent: 4516155 (1985-05-01), Hennig et al.

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