使用opencv库，通过调节阀值，来实现图片的轮廓提取(Using OpenCV library, through adjusting the threshold, to achieve the image contour extraction)

在VS2015环境下基于opencv(计算机视觉开源库)开发的针对图像中感兴趣区域的轮廓提取(Contour extraction for regions of interest in images based on OpenCV (open source library of computer vision) under the VS2015 environment)