Check syntax of stitchnig detailed

modules/stitching/include/opencv2/stitching/detail/blenders.hpp

@@ -73,7 +73,7 @@ public:
     @param corners Source images top-left corners
     @param sizes Source image sizes
      */
-    CV_WRAP void prepare(const std::vector<Point> &corners, const std::vector<Size> &sizes);
+    CV_WRAP virtual void prepare(const std::vector<Point> &corners, const std::vector<Size> &sizes);
     /** @overload */
     CV_WRAP virtual void prepare(Rect dst_roi);
     /** @brief Processes the image.

modules/stitching/include/opencv2/stitching/detail/motion_estimators.hpp

@@ -120,6 +120,8 @@ final transformation for each camera.
  */
 class CV_EXPORTS_W AffineBasedEstimator : public Estimator
 {
+public:
+    CV_WRAP AffineBasedEstimator(){}
 private:
     virtual bool estimate(const std::vector<ImageFeatures> &features,
                           const std::vector<MatchesInfo> &pairwise_matches,