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:
Jun. 20, 1978
Filed:
Dec. 06, 1976
Ingo Hoffrichter, Kiel, DT;
Hans-Georg Knop, Heikendorf, DT;
Dr.-Ing. Rudolf Hell GmbH, Kiel, DT;
Abstract
In the scanning and reproduction apparatus, the signal level of the 'black point' or darkest portion of an image, is automatically adjusted without disturbing the previously adjusted white level, by placing a level adjusting circuit in the signal path between the scanner and the reproduction device and including in the adjusting circuit elements affecting a decrease of the operational signal from black to white thereby avoiding disturbing the white level, and wherein the derived image signal of the darkest image portion or 'black point' is checked against a reference signal as the scanning proceeds, and also checked for coincidence with the reference signal.