OpenCV中使用vector<Point>可以組成多個點的形狀，或者四個點的旋轉矩形，
帶角度的矩形可以通過這種方式拿到：
vector<Point> ployPoints{Point(x1,y1),Point(x2,y2),Point(x3,y3),Point(x4,y5)};
RotatedRect rotated_rect = minAreaRect(ployPoints);
python中是這樣的，其中segmentation是這樣的：[x1, y1, x2, y2, x3, y3, x4, y4]:
segmentation = segmentation.reshape([-1, 2])
rect1 = cv2.minAreaRect(segmentation)
x, y, w, h, theta = rect1[0][0], rect1[0][1], rect1[1][0], rect1[1][1], rect1[2]
發一下OpenCV-C++原始碼對RotatedRect的表述：
class CV_EXPORTS RotatedRect
{
public:
//! various constructors
RotatedRect();
RotatedRect(const Point2f& center, const Size2f& size, float angle);
RotatedRect(const CvBox2D& box);
//! returns 4 vertices of the rectangle
void points(Point2f pts[]) const;
//! returns the minimal up-right rectangle containing the rotated rectangle
Rect boundingRect() const;
//! conversion to the old-style CvBox2D structure
operator CvBox2D() const;
Point2f center; //< the rectangle mass center
Size2f size; //< width and height of the rectangle
float angle; //< the rotation angle. When the angle is 0, 90, 180, 270 etc., the rectangle becomes an up-right rectangle.
};
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