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:
Feb. 12, 1985
Filed:
May. 19, 1982
Thomson-CSF, Paris, FR;
Abstract
The correction consists in correcting the overall luminance, while retaining the original chromaticity of the analyzed picture. For this purpose, the device according to the invention comprises a correcting circuit receiving the color signals V.sub.e1, V.sub.e2 and V.sub.e3 and supplying corrected color signals, a matrixing circuit supplying the overall luminance signal V.sub.e, and a control circuit calculating eight transfer parameters defining the transfer function F, which transforms the signal V.sub.e into a signal F(V.sub.e) covering the scale of luminances in accordance with an equal distribution in order to satisfy the optimum vision conditions. The control circuit processes the signal (F(V.sub.e)/V.sub.e) and the correcting circuit supplies corrected color signals respectively corresponding to the products V.sub.e1 .multidot.(F(V.sub.e)/V.sub.e), V.sub.e2 .multidot.(F(V.sub.e)/V.sub.e) and V.sub.e3 .multidot.(F(V.sub.e)/V.sub.e).