Automatic Matting Based on Depth of Field
Date Issued
2008
Date
2008
Author(s)
Chen, Yen-Hung
Abstract
Image matting is the problem of determining each pixel in an image whether it is foreground, background, or a mixture of foreground and background while "alpha" value is the parameter of portion of foreground and background in each pixel. Previous matting approaches are constrained by requiring certain amount of user input, for example, foreground/background strokes or trimap, to generate reasonable results. In this paper, we present an approach to automatically generate an alpha matte without any user input.e assume that the background is distant from the oreground and images are taken in narrow or limited depth of eld so the foreground is in focus while the background is blurred. We rst generate a rough trimap under our assumption andhen use this trimap to initially estimate alpha value of each unknown pixel. And after further optimization, a high quality alpha matte can be achieved.
Subjects
matting
depth-of-field
Type
thesis
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