Chromakey method and associated circuit arrangement

Details Chromakey method and associated circuit arrangement Chromakey method and associated circuit arrangement

1995-09-11

1998-02-17

Peng, John K.

Television

Image signal processing circuitry specific to television

Special effects

348586, 348592, H04N 974, H04N 975

Patent

active

057196400

ABSTRACT:
A chromakey method and an associated circuit arrangement are intended for treating transition colors in color keying in which transition colors occur in video pictures, for example at the edges between foreground objects and the key color of the background of these objects. For the proposed treatment of the transition colors, inter alia the keying function (k) plays a decisive role. It indicates the key color component for each transition color. To define this keying function (k), parameters are applied to a computer (C), which parameters fix a key color (.vertline.KC.vertline.,.theta.,.PHI.), a transition color (Cb, Cr, Y) and a boundary region (.alpha.,.beta.). In the color space, the boundary region separates the color of the foreground of a video picture from all other colors which may occur in the video picture. The keying function (k) is determined by way of the equation for the boundary.

REFERENCES:
patent: 4811084 (1989-03-01), Belmares-Sarabia et al.
patent: 5301016 (1994-04-01), Gehrmann
patent: 5436671 (1995-07-01), Gehrmann
patent: 5455633 (1995-10-01), Gehrmann

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