运行image_synthesis.m，两个参数分别为第一幅图片和第二幅图片，输出结果为合成后的图片(Running image_synthesis.m, the two parameters are the first picture and the second picture, the output result is the synthesized picture)

图割算法实现，包括α-expansion、α-β-swap 算法，可用于多标签优化任务(the implement of graph-cut algorithm)