Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-02-06
1990-01-02
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 41, H04N 967
Patent
active
048916897
ABSTRACT:
A color signal matrix circuit for producing first and second color difference signals from three primary color signals employs a reduced number of digital circuit elements and includes a first subtractor for producing a first color subtraction signal based on red and green primary color signals, a second subtractor for producing a second color subtraction signal based on blue and green primary color signals, a first level adjuster receiving the first color subtraction signal, a second level adjuster with a variable level factor receiving the second color subtraction signal, a third subtractor receiving the first color subtraction signal from the first level adjuster and the second color subtraction signal from the second level adjuster for producing the first color difference signal, and a third level adjuster receiving the second color subtraction signal, a fourth level adjuster with a variable level factor receiving the first color subtraction signal, and a fourth subtractor supplied with the second color subtraction signal from the third level adjuster and the first color subtraction signal from the fourth level adjuster for producing the second color difference signal.
REFERENCES:
patent: 4507676 (1985-03-01), Dischert et al.
patent: 4547796 (1985-10-01), Iwase et al.
Fukuda Tokuya
Matsumoto Hiroaki
Senda Tetsuya
Chin Tommy P.
Eslinger Lewis H.
Juo James
Maioli Jay H.
Sony Corporation
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