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:
Nov. 01, 1988
Filed:
Oct. 14, 1986
Hong C Park, Seoul, KR;
Gold Star Co., Ltd., Seoul, KR;
Abstract
An automatic focusing system adjusts the focus of video camera automatically using the contrast of the Y signal, which is one image input signal. The maximum and minimum values of the Y signal determine the contrast of the Y signal. This contrast value is then compared with the previous contrast value to determine if the focus driving motor should be signalled to rotate in the same direction as previously, a different direction or to stop rotation. Gating means with stored ranges are used to establish the successive detection of the Y signals to allow continuous operation of the auto focus circuit. Thus, the system can always automatically focus without being affected by the peripheral background of object.