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:
Jul. 22, 1997
Filed:
Jan. 04, 1995
Ariyoshi Hikosaka, Osaka, JP;
Tetsuji Kajitani, Osaka, JP;
Mita Industrial Co., Ltd., Osaka, JP;
Abstract
Before actually reading a document image, white reference data corresponding to a pure white document image is found in an AGC processing unit 32, and is set in a register 32a. In a CPU 33, data corresponding to the white reference data set in the register 32a is produced. The produced data is set in a register 32b. The set data is applied to a D/A converting unit 34, where the data is converted into analog data, after which the analog data is applied as a low reference voltage V.sub.ref L to an A/D converting unit 31. As a result, the maximum amplitude range of the analog image data becomes approximately the same as the input voltage range. Accordingly, AGC processing can be realized in a digital manner, thereby to make it possible to simplify the circuit arrangement, as compared with the conventional circuit arrangement, and to easily make fine adjustment.