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:
Sep. 19, 2000
Filed:
Apr. 01, 1996
Kangda Wang, Chofu, JP;
Kazuo Sonobe, Hidaka, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A threshold determination/binarization circuit and a recording medium for an information reproduction system, wherein the diameter of a reference dot detected by a reference dot diameter detection section is compared with a predetermined dot diameter as a standard value, and the threshold is adjusted such that the difference between the reference dot diameter and the standard value equals a predetermined target value, thereby obtaining the same binarization effect with respect to image signals obtained with different transfer characteristics (different media, recording states, and optical systems). This circuit also includes a maximum/minimum value detection section that detects the maximum and minimum values of an image signal level corresponding to a dot code. A threshold is calculated by using an internal ratio representing the radio between the maximum and minimum values so as to stabilize a reading operation against illumination and recording irregularity, contamination of a dot code, and the like. On a dot code recorded on a recording medium, attribute dots, each containing information associated with the recording medium, are arranged in a predetermined area on the reading start end side to set a threshold for binarization.