Method for replacing the background of an image

Details Method for replacing the background of an image Method for replacing the background of an image

1996-01-25

1999-07-13

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Special effects

348590, 348591, H04N 974

Patent

active

059233800

ABSTRACT:
The present invention is useful in taking a visible light image for identification and other purposes without the requirement of a photobooth, regardless of the background of the visible light image. The original background of the visible light 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 to produce a difference image of light intensity differences between corresponding pixels of the two images. A binarized image is generated by binarizing the difference image with respect to a predetermined threshold value .theta.. A connectivity constraint is used to generate a binary mask from the binarized image, then a gray-scale mask is produced by multiplying the binary mask times a preselected modulation function of the difference image. Warping the gray-scale mask produces a transformed mask. Finally, the background replaced visible light image is generated by blending the transformed mask with the visible light image, and replacing the original background with the preselected background.

REFERENCES:
patent: 4751571 (1988-06-01), Lillquist
patent: 4967276 (1990-10-01), Murakami
patent: 5001558 (1991-03-01), Burley
patent: 5386242 (1995-01-01), Chaplin
patent: 5400081 (1995-03-01), Chaplin
patent: 5574511 (1996-11-01), Yang

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