说明：  这篇paper是graph cuts的开山之作，系统介绍了如何构造graph和energy term来解stereo disparity, motion等问题，也比较直观的介绍了a-expansion
(This paper is for the graph cuts for the mountains, the system describes how to construct graph and energy term to solve stereo disparity, motion and other issues, are relatively straightforward introduction to the a-expansion)