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Cited by 310

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A global sampling method for alpha matting

He, Kaiming, Rhemann, Christoph, Rother, Carsten, Tang, Xiaoou, Sun, Jian·2011·CVPR 2011

Abstract

Alpha matting refers to the problem of softly extracting the foreground from an image. Given a trimap (specifying known foreground/background and unknown pixels), a straightforward way to compute the alpha value is to sample some known foreground and background colors for each unknown pixel. Existing sampling-based matting methods often collect samples near the unknown pixels only. They fail if good samples cannot be found nearby. In this paper, we propose a global sampling method that uses all samples available in the image. Our global sample set avoids missing good samples. A simple but effective cost function is defined to tackle the ambiguity in the sample selection process. To handle the computational complexity introduced by the large number of samples, we pose the sampling task as a correspondence problem. The correspondence search is efficiently achieved by generalizing a randomized algorithm previously designed for patch matching[3]. A variety of experiments show that our global sampling method produces both visually and quantitatively high-quality matting results.

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Metadata

Authors
He, K., Rhemann, C., Rother, C., Tang, X., & Sun, J.
Venue
CVPR 2011
Publisher
IEEE
Published
2011-06
Pages
2049-2056
OpenAlex
W2077604257
Cited by
310
References
20
FWCI
11.72
Type
conference paper
Language
en
Open access
closed

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CoChat. (2026). Citation check: A global sampling method for alpha matting. https://app.cochat.ai/papers/10.1109/cvpr.2011.5995495
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He, K., Rhemann, C., Rother, C., Tang, X., & Sun, J. (2011). A global sampling method for alpha matting. CVPR 2011. https://doi.org/10.1109/cvpr.2011.5995495

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