C++ OpenCV(四):绘制几何图形
绘制几何图形直线矩形多边形圆形椭圆文字API直线CV_EXPORTS_W void line(InputOutputArray img, Point pt1, Point pt2, const Scalar& color, int thickness = 1, int lineType = LINE_8, int shift = 0);矩形CV_EXPORTS_W void rectangle(InputOutputArray i