Self keyer with pre-emphasized fill video

Details Self keyer with pre-emphasized fill video Self keyer with pre-emphasized fill video

1989-10-06

1992-09-08

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358183, H04N 5275

Patent

active

051463334

ABSTRACT:
An improved self keyer generates a pre-emphasized fill video signal that compensates for the multiplication of the fill video signal with a self key signal derived from the fill video signal, i.e., reduces the black content at the transition. The fill video signal is multiplied by twice the complement of the self key signal and then added to the fill video signal to produce the pre-emphasized fill video signal. The pre-emphasized fill video signal is then combined with a background video signal under control of the self key signal.

REFERENCES:
patent: 4028727 (1977-06-01), Skrydstrup
patent: 4121253 (1978-10-01), McCoy
patent: 4823183 (1989-04-01), Jackson et al.
patent: 4851912 (1989-07-01), Jackson et al.
patent: 4920415 (1990-04-01), Chaplin

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