bsubsamp

代码说明：

  对边界进行二次取样源码，用canny等算法提取一次边界后，点数过多，不利于描述形状，用这个代码可以实现二次取样。(The boundary of second sampling source, such as canny extraction algorithm with a boundary, too many points, which describe the shape, use this code can realize the second sampling.)