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如图所示，计算两个旋转矩形相交重合区域的顶点，最多返回8个顶点。通过contourArea可返回该顶点集合的面积。
void DrawPointSet(Mat& imgInoutput, vector<Point> vecPoint, int radius, const Scalar& color, int thickness = 1, int lineType = LINE_8);
void DrawRotatedRect(Mat& imgInoutput, RotatedRect rectInput, Scalar color, int thickness = 1, int lineType = LINE_8);
void DrawRotatedRect(Mat& imgInoutput, RotatedRect rectInput, Scalar color, int thickness, int lineType)
{
Point2f* vertices = new cv::Point2f[4];
rectInput.points(vertices);
for (int j = 0; j < 4; j++)
line(imgInoutput, vertices[j], vertices[(j + 1) % 4], color, thickness, lineType);
}
void DrawPointSet(Mat& imgInoutput, vector<Point> vecPoint, int radius, const Scalar& color, int thickness, int lineType)
{
for (size_t i = 0; i < vecPoint.size(); i++)
circle(imgInoutput, vecPoint[i], radius, color, thickness, lineType);
}
int main()
{
Mat imgSrc = Mat::zeros(Size(500,500), CV_8UC3);
RotatedRect rect1;
rect1.center = Point2f(200,200);
rect1.size = Size(100,100);
rect1.angle = 3;
RotatedRect rect2;
rect2.center = Point2f(210, 180);
rect2.size = Size(100, 100);
rect2.angle = 10;
vector<Point2f> intersectingRegion;
rotatedRectangleIntersection(rect1, rect2, intersectingRegion);
DrawRotatedRect(imgSrc, rect1, Scalar(255, 0, 0));
DrawRotatedRect(imgSrc, rect2, Scalar(0, 0, 255));
if (intersectingRegion.empty())
return 0;
DrawPointSet(imgSrc, vector<Point>(intersectingRegion.begin(), intersectingRegion.end()), 3, Scalar(0, 255, 0));
double dbArea = contourArea(intersectingRegion);
}
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转播
