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:
Feb. 26, 2002
Filed:
Feb. 11, 2000
Roland Bonk, Stutensee, DE;
Uwe Zeller, Anspach, DE;
Sirona Dental Systems GmbH, Bensheim, DE;
Abstract
A method is proposed for compensating for the dark current of an electronic sensor having a plurality of pixels with an individual dark-current response, radiation for producing an image signal (BS) being directed from a beam source ( ) onto a detector arrangement ( ) containing the sensor, and a recording being taken with different clock-out rate (v) (integration time) by reading the detector signal (S) present in the pixels of the sensor, in which, before the beginning or after the end of the recording with radiation, the sensor is read out without radiation with at least two different clock-out rates (v , v ) and at least two dark-current signals (DC , DC ) are thereby picked up for each pixel, in which the dark-current signals (DC , DC ) that have been read out are then used to calculate a dark-current value (DV) of individual pixels of the sensor as a function of the clock-out rate (v), and in which a correction is then made, using the dark-current value associated with each pixel, to the detector signal (S) with the dark-current signal superimposed on it in order to calculate the picture value (PV).