Video Difference key generator

Details Video Difference key generator Video Difference key generator

Filed on

1986-10-24

Date issued

1989-01-24

Examiner

Groody, James J.

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Specific signal processing circuitry

Other Related Categories

358 22, 358136, 358183, H04N 514, H04N 5275, H04N 975

Type

Patent

Status

active

Patent number

048004324

Description

ABSTRACT:
A video difference key generator has a stored reference video image. An input video image is compared with the reference video image by an absolute difference circuit which substracts corresponding pixels of the two video images, the smaller from the larger, to produce a difference video image. The difference video image may be filtered, and then is input to a transfer function circuit to produce an output which may be used as a key signal for compositing video images.

REFERENCES:
patent: 4160994 (1979-07-01), Mendrala
patent: 4562466 (1985-12-01), Clapp et al.
patent: 4568981 (1986-02-01), Beaulier
patent: 4621280 (1986-11-01), Shinohara et al.
patent: 4667233 (1987-05-01), Furukawa

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