Merge pull request #13449 from Tytan:stitching-warp-interpolation

Stitching: added functions to set warp interpolation mode (#13449)

* Added functions to set warp interpolation mode

* Use InterpolationFlags enum

* Improved getter/setter naming

modules/stitching/include/opencv2/stitching.hpp

@@ -193,6 +193,9 @@ public:
     CV_WRAP bool waveCorrection() const { return do_wave_correct_; }
     CV_WRAP void setWaveCorrection(bool flag) { do_wave_correct_ = flag; }
 
+    CV_WRAP InterpolationFlags interpolationFlags() const { return interp_flags_; }
+    CV_WRAP void setInterpolationFlags(InterpolationFlags interp_flags) { interp_flags_ = interp_flags; }
+
     detail::WaveCorrectKind waveCorrectKind() const { return wave_correct_kind_; }
     void setWaveCorrectKind(detail::WaveCorrectKind kind) { wave_correct_kind_ = kind; }
 
@@ -289,6 +292,7 @@ private:
     double seam_est_resol_;
     double compose_resol_;
     double conf_thresh_;
+    InterpolationFlags interp_flags_;
     Ptr<Feature2D> features_finder_;
     Ptr<detail::FeaturesMatcher> features_matcher_;
     cv::UMat matching_mask_;

modules/stitching/src/stitcher.cpp

@@ -55,6 +55,7 @@ Ptr<Stitcher> Stitcher::create(Mode mode)
     stitcher->setSeamFinder(makePtr<detail::GraphCutSeamFinder>(detail::GraphCutSeamFinderBase::COST_COLOR));
     stitcher->setBlender(makePtr<detail::MultiBandBlender>(false));
     stitcher->setFeaturesFinder(ORB::create());
+    stitcher->setInterpolationFlags(INTER_LINEAR);
 
     stitcher->work_scale_ = 1;
     stitcher->seam_scale_ = 1;
@@ -185,7 +186,7 @@ Stitcher::Status Stitcher::composePanorama(InputArrayOfArrays images, OutputArra
         K(1,1) *= (float)seam_work_aspect_;
         K(1,2) *= (float)seam_work_aspect_;
 
-        corners[i] = w->warp(seam_est_imgs_[i], K, cameras_[i].R, INTER_LINEAR, BORDER_REFLECT, images_warped[i]);
+        corners[i] = w->warp(seam_est_imgs_[i], K, cameras_[i].R, interp_flags_, BORDER_REFLECT, images_warped[i]);
         sizes[i] = images_warped[i].size();
 
         w->warp(masks[i], K, cameras_[i].R, INTER_NEAREST, BORDER_CONSTANT, masks_warped[i]);
@@ -297,7 +298,7 @@ Stitcher::Status Stitcher::composePanorama(InputArrayOfArrays images, OutputArra
         int64 pt = getTickCount();
 #endif
         // Warp the current image
-        w->warp(img, K, cameras_[img_idx].R, INTER_LINEAR, BORDER_REFLECT, img_warped);
+        w->warp(img, K, cameras_[img_idx].R, interp_flags_, BORDER_REFLECT, img_warped);
         LOGLN(" warp the current image: " << ((getTickCount() - pt) / getTickFrequency()) << " sec");
 #if ENABLE_LOG
         pt = getTickCount();