Background replacement for an image

H - Electricity – 04 – N

Patent

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Details

H04N 5/272 (2006.01) G03B 17/53 (2006.01) H04N 1/387 (2006.01)

Patent

CA 2212169

The present invention is useful in taking images for identification and other purposes without the requirement of a photobooth, regardless of the background of the image. The original background of the image is replaced with a preselected background. Two IR images with different intensities of IR illumination in the foreground and background regions of the scene, respectively, are compared for light intensity differences between corresponding pixels of the two images to form a mask differentiating between the foreground and background regions of the image. The mask is then applied to a visible light image of the scene and the preselected background is used to replace the original background.

La présente invention est utile pour la prise d'images à des fins d'identification et à d'autres fins sans le recours à un photomaton, quel que soit le fond de l'image. Le fond original de l'image est remplacé par un fond présélectionné. Deux images IR, caractérisées respectivement par des intensités différentes d'éclairage IR à l'avant-plan et à l'arrière-plan de la scène, sont comparées en vue de la détection des différences d'intensité lumineuse entre les pixels correspondants des deux images, de façon à former un masque différenciant l'avant-plan et l'arrière-plan de l'image. Le masque est ensuite appliqué à une image lumineuse visible de la scène, et le fond présélectionné remplace le fond original.

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