Backing luminance non-uniformity compensation in real-time compo

Details Backing luminance non-uniformity compensation in real-time compo Backing luminance non-uniformity compensation in real-time compo

1996-09-10

1999-08-17

Lee, Michael H.

Television

Image signal processing circuitry specific to television

Special effects

348586, H04N 975, H04N 5272

Patent

active

059401400

ABSTRACT:
A method of removing the foreground subject and its shadow from a series of image frames including a subject before a colored backing being photographed by a moving camera during a live broadcast. Such removal results in a series of image frames of the colored backing without the subject, each image frame corresponding to an image frame containing the subject. The method steps employed identify, for each frame, those pixels in the frame occupied by elements of the subject. Those pixels are set to an RGB level of zero, to create an image of the colored backing in which the subject area is reduced to black. The image of the colored backing is then smeared to obliterate the defined edges of the subject's shadow and to smear the color of the backing into the black area previously occupied by the subject to generate a clear frame. The clear frame is then utilized to compensate for backing luminance and color nonuniformity, thereby preventing visibility of the joining edge of generated windows that extend the backing to the edge of the frame.

REFERENCES:
patent: 5424781 (1995-06-01), Vlahos
patent: 5515109 (1996-05-01), Vlahos et al.
patent: 5557339 (1996-09-01), Dadourian
patent: 5831685 (1998-11-01), Vlahos et al.

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