The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1990
Filed:
Mar. 20, 1989
Applicant:
Inventor:
Daniel J Chaplin, Nevada City, CA (US);
Assignee:
The Grass Valley Group, Inc., Nevada City, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358183 ; 358182 ;
Abstract
An improved self keyer preconditions a fill video prior to mixing with a background video under control of a self key signal derived from the fill video. A variable gray luminance signal is substituted for low luminance portions of the fill video under control of a precondition key signal derived from the self key signal to produce the preconditioned fill video. The resulting output video has a smooth luminance transition between the fill and background videos in lieu of an unpleasant black artifact at the edges of the fill video.