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:
Oct. 16, 2001
Filed:
Feb. 05, 1999
Dongtai Liu, Fremont, CA (US);
Syscan, Inc., San Jose, CA (US);
Abstract
A self-calibration system for image sensors is disclosed. The system compensates signals from the image sensors for any distortions caused by inherent deficiencies in the image sensors. Image sensing modules employing the present invention will produce self-calibrated image signals without requiring the commonly used follow-up signal processing schemes. To achieve the self-calibration, an analyzing circuit is used to determine gains and offset values for each of the photodetectors in the image sensor based on a set of test signals. The gains and offset values are then stored in a persistent memory for access by an amplifier to adjust scanning signals representing a scanning object.