System and method for defocus difference matting

Details System and method for defocus difference matting System and method for defocus difference matting

2005-07-29

2008-08-05

Hsia, Sherrie (Department: 2622)

Television

Image signal processing circuitry specific to television

Special effects

C348S586000

Reexamination Certificate

active

07408591

ABSTRACT:
A method extracts an alpha matte from a video acquired of a scene. A set of pinhole or narrow aperture images IPis acquired of the scene with a camera aperture set to a relatively large depth-of-field. The scene includes a background B and a foreground F. A corresponding set of wide aperture images IFis acquired of the scene with the camera aperture set to a relatively small depth-of-field. The respective pinhole and wide aperture images are combined to extract an alpha matte according toin-line-formulae description="In-line Formulae" end="lead"?α=1+(IF−IP)/(B−BF).in-line-formulae description="In-line Formulae" end="tail"?

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