Method and circuit apparatus for combining two television signal

Details Method and circuit apparatus for combining two television signal Method and circuit apparatus for combining two television signal

1989-03-20

1990-08-07

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358105, 358 38, H04N 974

Patent

active

049472402

ABSTRACT:
A decision signal for switching or fading between foreground and background television signals in accordance with the chroma-key method is subjected to vertical scan delay filtering for line signal averaging in television signals to avoid disturbance of the decision signal by results of the field interlace feature of a standard television signal. The delay for such filtering is provided by a random access digital memory and provides a delay of one period of the vertical scan frequency. Filtering is obtained by averaging delayed and undelayed output of the chromakey color selection signal or by recursively filtering that signal utilizing the same period and type of delay.

REFERENCES:
patent: 4300162 (1981-11-01), Robers
patent: 4549213 (1985-10-01), Illetschko

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