Global Patent Index - EP 1243131 A1

EP 1243131 A1 2002-09-25 - METHOD FOR TEMPERATURE COMPENSATION IN AN IMAGE SENSOR

Title (en)

METHOD FOR TEMPERATURE COMPENSATION IN AN IMAGE SENSOR

Title (de)

VERFAHREN ZUR TEMPERATURKORREKTUR IN EINEMBILDSENSOR

Title (fr)

PROCEDE DE COMPENSATION EN TEMPERATURE D'UN DETECTEUR D'IMAGE

Publication

EP 1243131 A1 (FR)

Application

EP 00990831 A

Priority

  • FR 0003716 W
  • FR 9916591 A

Abstract (en)

[origin: WO0149023A1] The invention concerns a method for temperature compensation in an image sensor comprising photosensitive points (O1 to O6, R1 to R9) sensitive to room temperature, each connected to a line conductor (Y1 to Y3) and a column conductor (W1, W2, Z1 to Z3). Each of the photosensitive points is connected by one of its conductors to a reading circuit (30a, 30b). The photosensitive points are divided into sensing photosensitive points (R1 to R9) designed to be exposed to a light information translating the image to be detected, the reading circuits (30b) associated with said photosensitive points delivering each a measurement voltage representing the image to be detected and into blind photosensitive points (O1 to O6) protected from the light information, the reading circuits (30a) associated with said blind sensitive points delivering each a darkness voltage enabling temperature compensation. When an image is detected, the method consists in collecting darkness voltages derived from one or several detected images and in using the average correction value to generate a correction voltage (VDR) to be applied, when a subsequent image is detected, to the reading circuits (30b) associated with the sensing photosensitive points (R1 to R9) so that they deliver a substantially temperature-independent measurement voltage. The invention is particularly applicable to radiological image detectors.

IPC 1-7 (main, further and additional classification)

H04N 5/217

IPC 8 full level (invention and additional information)

H04N 5/32 (2006.01); H04N 5/359 (2011.01); H04N 5/361 (2011.01); H04N 5/365 (2011.01); H04N 5/374 (2011.01)

CPC (invention and additional information)

H04N 5/361 (2013.01); H04N 5/3597 (2013.01); H04N 5/3655 (2013.01); H04N 5/374 (2013.01)

Citation (search report)

See references of WO 0149023A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

EPO simple patent family

WO 0149023 A1 20010705; AU 3029601 A 20010709; CA 2395566 A1 20010705; CA 2395566 C 20081118; EP 1243131 A1 20020925; FR 2803081 A1 20010629; FR 2803081 B1 20021206; JP 2003529972 A 20031007; US 2002190216 A1 20021219; US 6737654 B2 20040518

INPADOC legal status


2009-07-29 [18R] REFUSED

- Effective date: 20081209

2003-10-29 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20030917

2002-09-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020717

2002-09-25 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-09-25 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI