基于传统方法的抠图算法，可望移动端实时。目前传统抠像算法中最好的。速度比closed form快。在alphpamatting网站的排名为28，36.4（实时版本）。
基本步骤为：
- Expansion of Known Regions: extrapolates “known foreground" and “known background" regions of the trimap into the “unknown" regions;
- Sample Selection and Matte Computation: tries to identify, for each pixel in the unknown regions, the best pair of foreground and background samples. It also com- putes an alpha matte from the obtained samples;
- Local Smoothing: locally smooths the resulting matte while maintaining its distinct features.
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