opencv_tutorial_code学习——findContours&drawContours&画最小包围矩形&画最小包围圆

tutorial_code\ShapeDescriptors\generalContours_demo1.cpp

步骤：

1、灰度化

2、滤波

3、二值化

4、画轮廓

findContours( threshold_output, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0, 0) );

for( size_t i = 0; i< contours.size(); i++ )

{

Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );

drawContours( drawing, contours_poly, (int)i, color, 1, 8, vector<Vec4i>(), 0, Point() );

}

5、画最小包围矩形和最小包围圆

第一步：

vector<vector<Point> > contours_poly( contours.size() );

vector<Rect> boundRect( contours.size() );

vector<Point2f>center(