有向边框RotatedRect的绘制 以及外边框计算

RotatedRect

class RotatedRect
The class represents rotated (i.e. notup-right) rectangles on a plane. Each rectangle is specified by the centerpoint (mass center), length of each side (represented by cv::Size2f structure)and the rotation angle in degrees.

C++: RotatedRect::RotatedRect()
C++: RotatedRect::RotatedRect(const Point2f& center, const Size2f& size, float angle)
C++: RotatedRect::RotatedRect(const CvBox2D& box)

Parameters

center – The rectangle masscenter.

size – Width and height of therectangle.

angle – The rotation angle in aclockwise direction. When the angle is 0, 90, 180,270 etc., the rectanglebecomes an up-right rectangle.

box – The rotated rectangle parametersas the obsolete CvBox2D structure.

C++: void RotatedRect::points(Point2f pts[]) const
C++: Rect RotatedRect::boundingRect() const
C++: RotatedRect::operator CvBox2D() const

Parameters

pts – The points array forstoring rectangle vertices.

[cpp]
view plain
copy

Mat image(200, 200, CV_8UC3, Scalar(0));  
RotatedRect rRect = RotatedRect(Point2f(100,100), Size2f(100,50), 30);  
Point2f vertices[4];  
rRect.points(vertices);  
for (int i = 0; i < 4; i++)  
    line(image, vertices[i], vertices[(i+1)%4], Scalar(0,255,0));  
Rect brect = rRect.boundingRect();  
rectangle(image, brect, Scalar(255,0,0));  
imshow("rectangles", image); 

原文地址：http://blog.csdn.net/wdy_yx/article/details/8955518