opencv_tutorial_code学习——画最小包围旋转矩形&画最小包围椭圆

tutorial_code\ShapeDescriptors\generalContours_demo2.cpp

步骤：

1、灰度化

2、滤波

3、二值化

4、画轮廓 findContours（）

5、画最小包围旋转矩形和最小包围椭圆

vector<RotatedRect> minRect( contours.size() );

vector<RotatedRect> minEllipse( contours.size() );

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

{ minRect[i] = minAreaRect( Mat(contours[i]) );

if( contours[i].size() > 5 )

{ minEllipse[i] = fitEllipse( Mat(contours[i]) ); }

}

Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );

Mat drawing1 = Mat::zeros(threshold_output.size(), CV_8UC3);

Mat drawing2 = Mat::zeros(threshold_output.size(), CV_8UC3);

for( size_t i = 0; i< c