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,

modules/stitching/src/blenders.cpp

@@ -133,7 +133,6 @@ void Blender::blend(InputOutputArray dst, InputOutputArray dst_mask)
     dst_mask_.release();
 }
 
-
 void FeatherBlender::prepare(Rect dst_roi)
 {
     Blender::prepare(dst_roi);
@@ -231,7 +230,6 @@ MultiBandBlender::MultiBandBlender(int try_gpu, int num_bands, int weight_type)
     weight_type_ = weight_type;
 }
 
-
 void MultiBandBlender::prepare(Rect dst_roi)
 {
     dst_roi_final_ = dst_roi;