【转】OpenCV对图片中的RotatedRect进行填充

函数名：full_rotated_rect

函数参数： image输入图像，rect希望在图像中填充的RotatedRect，color填充的颜色

主要的思路是：先找到RotatedRect的四个顶点，然后画出外框。再利用四个顶点找出其中平行两边的所有点，对相应的两个点进行连接。

 void full_rotated_rect(Mat &image, const RotatedRect &rect, const Scalar &color)
 {
     CvPoint2D32f point[];
     Point pt[];
     vector<Point> center1, center2;  

     /*画出外框*/
     cvBoxPoints(rect, point);
     for (int i = ; i<; i++)
     {
         pt[i].x = (int)point[i].x;
         pt[i].y = (int)point[i].y;
     }
     line(image, pt[], pt[], color, );
     line(image, pt[], pt[], color, );
     line(image, pt[], pt[], color, );
     line(image, pt[], pt[], color, );  

     /*填充内部*/
     find_all_point(pt[], pt[], center1);  /*找出两点间直线上的所有点*/
     find_all_point(pt[], pt[], center2);
     vector<Point>::iterator itor1 = center1.begin(), itor2 = center2.begin();
     while (itor1 != center1.end() && itor2 != center2.end())
     {
         line(image, *itor1, *itor2, color, );  /*连接对应点*/
         itor1++;
         itor2++;
     }  

     vector<Point>().swap(center1);
     vector<Point>().swap(center2);
 }  

函数名：find_all_point

函数参数：start起始点，end结束点，save保存点的容器

主要思路：递归查找两点的中点，直到两点相同。

 void find_all_point(Point start, Point end, vector<Point> &save)
 {
     if (abs(start.x - end.x) <=  && abs(start.y - end.y) <= )
     {
         save.push_back(start);
         return; /*点重复时返回*/
     }  

     Point point_center;
     point_center.x = (start.x + end.x) / ;
     point_center.y = (start.y + end.y) / ;
     save.push_back(point_center);   /*储存中点*/
     find_all_point(start, point_center, save);  /*递归*/
     find_all_point(point_center, end, save);
 }  

原图：

填充后：

转自WizardtoH