Added some assert statements to constrain the type of the input and output…

Added some assert statements to constrain the type of the input and output parameters. Convert the input set of points to vector<Point2f> before passing it to the findMinimumAreaEnclosingTriangle function.

modules/imgproc/src/min_enclosing_triangle.cpp

@@ -273,6 +273,8 @@ void cv::minEnclosingTriangle(cv::InputArray points,
                               CV_OUT cv::OutputArray triangle, CV_OUT double& area) {
     std::vector<cv::Point2f> resultingTriangle;
 
+    CV_Assert(triangle.getMat().depth() == CV_32F);
+
     createConvexHull(points);
     findMinEnclosingTriangle(resultingTriangle, area);
     copyResultingTriangle(resultingTriangle, triangle);
@@ -288,11 +290,14 @@ void cv::minEnclosingTriangle(cv::InputArray points,
 */
 static void createConvexHull(cv::InputArray points) {
     cv::Mat pointsMat = points.getMat();
+    std::vector<cv::Point2f> pointsVector;
 
     CV_Assert((pointsMat.checkVector(2) > 0) &&
               ((pointsMat.depth() == CV_32F) || (pointsMat.depth() == CV_32S)));
 
-    convexHull(points, polygon, true, true);
+    pointsMat.convertTo(pointsVector, CV_32F);
+
+    convexHull(pointsVector, polygon, true, true);
 }
 
 //! Find the minimum enclosing triangle and its area