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:
Aug. 17, 1993
Filed:
Aug. 28, 1992
Richard F Lehman, Nashua, NH (US);
Roger A Wendt, Londonderry, NH (US);
Calvin M Winey, Carlisle, MA (US);
Howtek, Inc., Nashua, NH (US);
Abstract
A rotary color scanner has both linear and logarithmic mode static and dynamic calibration to quickly and automatically calibrate the scanner before each scan, as well as during a given scan, without operator intervention of any kind, whether in the factory or in the field. Close calibration is achieved, despite the use of photomultiplier detectors which are inherently particularly susceptible to drift, and despite the use of high intensity lamps whose output typically varies greatly with aging. The system establishes operation at an optimized data throughput rate up to a limit determined by the maximum scan rate of the system, and thereafter switches to operation at an optimized signal/noise ratio.