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1. (WO1998014002) LOCAL AUTO-ADAPTIVE OPTIC SENSOR

Pub. No.:    WO/1998/014002    International Application No.:    PCT/EP1997/005306
Publication Date: Apr 2, 1998 International Filing Date: Sep 27, 1997
IPC: H04N 5/335
H04N 5/355
Applicants: BÖHM, Markus
LULE, Tarek
Inventors: BÖHM, Markus
LULE, Tarek
Title: LOCAL AUTO-ADAPTIVE OPTIC SENSOR
Abstract:
The dynamics of common image sensor are not sufficient to process the luminosity contrasts which occur in many situations. The dynamic enhancement processes hitherto disclosed have considerable disadvantages for practical applications. Image sensors produced by the new process should link enhanced dynamics to ease of use. In order to avoid pixel overexposure or underexposure in the event of high image contrasts, a local auto-adaptive control is proposed. By means of this control, each pixel automatically ends its integration period as soon as it has integrated a sufficient photocurrent. An analogue signal represents the length of the integration period selected by the pixel. It represents together with the integrated pixel signal a highly dynamic brightness information with less strict requirements on the dynamics of the individual signals. Owing to their local auto-adaptability, these image sensors are suitable for all fields of application in which high luminosity contrasts must be processed, for example vehicle guidance in road traffic, nature films or astronomy.