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:
May. 19, 1987
Filed:
Feb. 25, 1985
Applicant:
Inventor:
Peter M Flamm, Freiburg, DE;
Assignee:
Etutsche ITT Industries GmbH, Freiburg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358 28 ;
Abstract
From the digital color-difference signals (b-y, r-y), the digital flesh-tone correction circuit forms a signal corresponding to the tangent between the two color-difference signals by means of absolute-value stages, a comparator, an intermediate switch, and a divider. In a correction stage, this signal is changed into the address signal for a read-only memory which holds the sine and cosine values of a preset function within a presettable angle correction range. By suitably multiplying the sine and cosine values by the color-difference signals in a multiplier, the flesh-tone-corrected color-difference signals are produced.