Apparatus and method for obtaining an image of a fluorescent...

A - Human Necessities – 61 – B

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A61B 5/00 (2006.01) A61B 3/14 (2006.01)

Patent

CA 2745200

The invention provides an imaging apparatus (10) for obtaining an image (40) of a fluorescent pattern (32) under ambient light, such as a fluorescent barcode or a fingerprint dyed with a fluorescent marker. The apparatus includes a synchronous shutter imaging device (12) having an image recording sensor and a shutter, a first pulsed light source (18) which emits a pulse of light having an excitation wavelength of the fluorescent pattern, an optical filter (14) which prevents light having the excitation wavelength from reaching the image recording sensor of the synchronous shutter imaging device, and a synchronisation control (22) which synchronises the shutter and the pulsed light source. The synchronisation of the shutter and pulse, so that the shutter opens during the pulse, and the provision of the optical filter allow a low intensity light source to be used and an image to be obtained under ambient light conditions.

La présente invention concerne un appareil d'imagerie (10) permettant d'obtenir une image (40) sous éclairage ambiant d'un motif fluorescent (32) tel qu'un code à barres fluorescent ou une empreinte colorée avec un marqueur fluorescent. L'appareil comprend un dispositif d'imagerie à obturateur synchrone (12) comportant un capteur d'enregistrement d'image et un obturateur, une première source de lumière pulsée (18) qui émet une impulsion de lumière à une longueur d'onde d'excitation du motif fluorescent, un filtre optique (14) qui empêche la lumière à la longueur d'onde d'excitation d'atteindre le capteur d'enregistrement d'image du dispositif d'imagerie à obturateur synchrone, et une commande de synchronisation (22) qui synchronise lobturateur et la source de lumière pulsée. La synchronisation de l'ouverture de lobturateur et de limpulsion et le filtre optique permettent d'utiliser une source lumineuse de faible intensité et d'obtenir une image dans des conditions d'éclairage ambiant.

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