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. 11, 2010
Filed:
Apr. 21, 2005
Applicants:
Masatoshi Sase, Kanagawa, JP;
Koichi Higashi, Kanagawa, JP;
Inventors:
Masatoshi Sase, Kanagawa, JP;
Koichi Higashi, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N 9/64 (2006.01); H04N 5/217 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical black level control circuit comprises a digital black level adjusting circuit for generating a black level correction signal by digital processing using a given time constant when an output error between an optical black level and a reference optical black level signal is within a predetermined range so that an error becomes less than a predetermined value and an analog black level adjusting circuit for compensating for said error when said error exceeds the predetermined range.