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, 1986
Filed:
May. 09, 1984
Gabor C Temes, Los Angeles, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A solid state imager wherein a pixel non-uniformity correction system compensates for photosite non-uniformities by providing a linear correction method and utilizing three modes: mode #1--dark current detection, mode #2--uniform illumination, and mode #3--data detection mode. In the first calibration cycle, the outputs of all the photocells on an imager 10, representing 'dark current' are stored in an 'offset' memory 14. In the second calibration cycle, a uniform illumination from a constant light level is applied to the imager 10. This uniform illumination signal is passed to an arithmetic unit 18 where the dark current signal is subtracted from it and the difference is then stored in gain memory 28. The gain memory passes this signal back to the arithmetic unit 18, so that in the third mode, the data detection mode, the arithmetic unit 18 can electronically correct the data signals that were non-uniformly affected by the internal characteristics of the imager.