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:
Jan. 23, 2001
Filed:
Jun. 30, 1999
Mark Francis Rumreich, Indianapolis, IN (US);
Mark Robert Zukas, Indianapolis, IN (US);
Ronald Thomas Keen, Indianapolis, IN (US);
Thomson Licensing S.A., Boulogne, FR;
Abstract
A chrominance signal C is separated (,) into component vectors U and V and coupled via respective paths each including a controllable gain amplifier (,) to respective outputs (,). A chroma overload protection unit (,) is provided including a saturation calculator (,) determines the saturation of the vector components and provides a saturating indicating signal to a gain characteristic unit (,) which jointly controls the gain of the amplifiers to proportionally limit the vector component magnitudes as a given function of the saturation indicating signal on a pixel by pixel basis thereby providing output component vectors (U,V) exhibiting no tint shift upon limiting conditions. In a digital embodiment, the amplifiers are implemented by multipliers (,) having outputs subjected to symmetrical rounding (,), saturation is calculated (,A) by an approximation to the square root of the sum of squares of the vector components, and plural look up tables (,A) are provided for generating the gain control signal G.