中文说明：自己修改的基于closed-form的程序，对外国程序在时间上有两倍的改善，能对在复杂背景下的图片，通过画一些简单的前景线，背景线，抠图出前景
English Description：
The self modified program based on closed form can improve the time of foreign programs twice. It can draw some simple foreground lines and background lines to extract the foreground of pictures in complex background