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1. WO2000040009 - DARK-CURRENT COMPENSATION CIRCUIT

Publication Number WO/2000/040009
Publication Date 06.07.2000
International Application No. PCT/US1999/031120
International Filing Date 29.12.1999
Chapter 2 Demand Filed 28.07.2000
IPC
G06T 1/00 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
1General purpose image data processing
H04N 1/028 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
024Details of scanning heads
028for picture-information pick-up
H04N 5/361 2011.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors
357Noise processing, e.g. detecting, correcting, reducing or removing noise
361applied to dark current
CPC
H04N 5/361
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors [SSIS]
357Noise processing, e.g. detecting, correcting, reducing or removing noise
361applied to dark current
Applicants
  • INTEL CORPORATION [US/US]; 2625 Walsh Avenue Santa Clara, CA 95051, US
Inventors
  • THOMAS, Brent, D.; US
  • AFGHAHI, Morteza; US
Agents
  • VIKSNINS, Ann, S.; Schwegman, Lundberg, Woessner & Kluth P.O. Box 2938 Minneapolis, MN 55402, US
Priority Data
09/223,13030.12.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DARK-CURRENT COMPENSATION CIRCUIT
(FR) CIRCUIT DE COMPENSATION DU COURANT D'OBSCURITE
Abstract
(EN)
An imaging device includes a compensation circuit for reducing an effect of dark current generated during operation. The compensation circuit calculates an initial dark current offset value using optically dark regions of a photo sensitive array. The compensation circuit also automatically adjusts the initial dark current offset value as output signals from successive rows of the photo sensitive array are transferred. The compensation circuit can calculate the initial dark current offset value each time an image is captured, thereby compensating for variables such as temperature.
(FR)
L'invention porte sur un dispositif d'imagerie comprenant un circuit de compensation réduisant l'effets du courant d'obscurité produit pendant le fonctionnement en calculant une valeur initiale de décalage du courant d'obscurité en utilisant les zones optiquement sombres d'un réseau photosensible. Par ailleurs, le circuit de compensation règle automatiquement la valeur initiale de décalage du courant d'obscurité lors du transfert des signaux sortant des rangées successives du réseau photosensible; il peut également calculer la valeur initiale de décalage du courant d'obscurité à chaque saisie d'image, compensant ainsi des variables telles que la température.
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