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:
Jul. 23, 1996
Filed:
Sep. 09, 1994
Applicant:
Inventors:
Ahmad Sadjadian, Woodall Park, GB;
Terence R Hurley, Pencoed Technology Park, GB;
Assignees:
Sony Corporation, Tokyo, JP;
Sony United Kingdom Limited, Surrey, GB;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
348591 ; 348584 ;
Abstract
In deriving a key signal for a digital mixer from an input video signal, most values of the key signal are derived by a clip and gain circuit. However, in the special case where the normalized product values for adjacent pixels lie on opposite sides of the upper and lower bounds, the following equations are used to determine the key values (K.sub.i and K.sub.h) for the two adjacent pixels: