Title:
【発明の名称】キー信号発生器
Document Type and Number:
Japanese Patent JP2662957
Kind Code:
B2
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 subtracts 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.
Inventors:
RONII DEI BAANETSUTO
SUTEIIBUN EMU PAAKUSU
SUTEIIBUN EMU PAAKUSU
Application Number:
JP26615787A
Publication Date:
October 15, 1997
Filing Date:
October 21, 1987
Export Citation:
Assignee:
TEKUTORONITSUKUSU INC
International Classes:
H04N5/275; H04N5/278; H04N5/445; H04N7/18; H04N9/75; H04N5/272; (IPC1-7): H04N5/275; H04N5/278; H04N5/445; H04N7/18; H04N9/75
Domestic Patent References:
| JP54130829A | ||||
| JP57173286A | ||||
| JP6266791A | ||||
| JP5824275A |
Other References:
【文献】米国特許4549213(US,A)
Attorney, Agent or Firm:
Kunio Yamaguchi (1 person outside)