Inexpensive adaptive fingerprint image acquisition framegrabber

G - Physics – 06 – K

Patent

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G06K 9/20 (2006.01) G06K 9/00 (2006.01)

Patent

CA 2229587

An advanced low cost adaptive frame grabber has been described. Main area of application for this framegrabber is in fingerprint identification, verification systems, but it could successfully be used in other biometric identification systems, such as facial, iris or eye identification and/or verification systems. The proposed framegrabber is also very suitable for all applications in other areas, like medical electronics, car electronics etc., where automatic image enhancement and/or transformation from grey scale to line art is required. The adaptive framegrabber automatically estimates the dynamic range of the acquired image ant sets up a proper offset and measurement range for the video analog to digital converter (ADC). It could also be operated in two different modes, in one the image is acquired as a full grey scale image, and in the other - as a line art ( black and white ) image. Full controls over the image size and resolution are provided.

Saisisseur d'image perfectionné, adaptable et économique. Ses applications principales sont dans le domaine des systèmes d'identification et vérification d'empreintes digitales, mais il peut aussi être avantageusement utilisé dans d'autres systèmes d'identification biométrique, p. ex. des systèmes d'identification ou de vérification de traits faciaux, de l'iris ou de l'oeil. Il convient aussi très bien à toutes applications dans d'autres domaines tels que l'électronique médicale, l'électronique automobile, etc., nécessitant l'amélioration ou la transformation automatique de l'image par passage de l'échelle de gris au noir et blanc. Le saisisseur d'image adaptable estime automatiquement la plage dynamique de l'image acquise et établit une plage de décalage et de mesure convenable pour le convertisseur analogique-numérique (ADC). En outre, il peut fonctionner dans deux modes d'acquisition d'image différents, soit entièrement en valeurs de gris ou en noir et blanc. La taille et la résolution de l'image sont entièrement commandées.

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