Method of and arrangement for inserting a background signal into

Details Method of and arrangement for inserting a background signal into Method of and arrangement for inserting a background signal into

1994-02-16

1995-01-17

Groody, James J.

Television

Image signal processing circuitry specific to television

Special effects

348591, H04N 974

Patent

active

053829808

ABSTRACT:
A method of inserting a background signal (BG) into parts of a foreground signal (FG), which parts are fixed by a predetermined key color (KC), in which method a control signal (k) is derived from the foreground signal (FG), which control signal assumes a first value when the foreground signal (FG) represents a color in the region of the key color (KC) and a second value when the foreground signal (FG) represents a different color, in which the control signal (k) has a transition range between the two values, and in which a difference, influenced by the control signal (k), between the vector of the background signal (BG) and the vector of a signal (KC) representing the key color is vectorially added to the foreground signal (FG) in accordance with Patent (U.S. patent application Ser. No. P 41 43 180.4), as well as an arrangement for performing this method. A further improvement of the picture quality while using a small number of components is achieved in that the background signal (BG), the signal (KC) representing the key color and the foreground signal (FG) each comprise a component representing the blue component (Cb) and the red component (Cr) as well as a luminance component (Y) and, as regards all their components, the signals are combined in the corresponding, afore-mentioned manner.

REFERENCES:
patent: 4667221 (1987-05-01), Cawley
patent: 4811084 (1989-03-01), Belmares-Sarabia
patent: 4949165 (1990-08-01), Riemann
patent: 5249039 (1993-09-01), Chaplin
patent: 5301016 (1994-04-01), Gehrmann

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