- Added the minEnclosingTriangle function declaration to the imgproc header

- Added the source code for the function in the separate file min_enclosing_triangle.cpp

modules/imgproc/include/opencv2/imgproc.hpp

@@ -1451,6 +1451,10 @@ CV_EXPORTS_W void boxPoints(RotatedRect box, OutputArray points);
 CV_EXPORTS_W void minEnclosingCircle( InputArray points,
                                       CV_OUT Point2f& center, CV_OUT float& radius );
 
+//! computes the minimal enclosing triangle for a convex polygon defined by at least three points
+CV_EXPORTS_W void minEnclosingTriangle( const std::vector<Point2f> &convexPolygon,
+                                        CV_OUT std::vector<Point2f> &triangle, CV_OUT double& area );
+
 //! matches two contours using one of the available algorithms
 CV_EXPORTS_W double matchShapes( InputArray contour1, InputArray contour2,
                                  int method, double parameter );