diff --git a/modules/calib3d/src/fisheye.cpp b/modules/calib3d/src/fisheye.cpp
index 8e3e20ece15eb99a0ea8a88e8e5b126c294b74e5..650121b46d60f3b5f2cffdce56fa83c12ac1529d 100644
--- a/modules/calib3d/src/fisheye.cpp
+++ b/modules/calib3d/src/fisheye.cpp
@@ -1304,12 +1304,12 @@ cv::Mat cv::internal::NormalizePixels(const Mat& imagePoints, const IntrinsicPar
     CV_Assert(!imagePoints.empty() && imagePoints.type() == CV_64FC2);
 
     Mat distorted((int)imagePoints.total(), 1, CV_64FC2), undistorted;
-    const Vec2d* ptr   = imagePoints.ptr<Vec2d>(0);
-    Vec2d* ptr_d = distorted.ptr<Vec2d>(0);
+    const Vec2d* ptr   = imagePoints.ptr<Vec2d>();
+    Vec2d* ptr_d = distorted.ptr<Vec2d>();
     for (size_t i = 0; i < imagePoints.total(); ++i)
     {
         ptr_d[i] = (ptr[i] - param.c).mul(Vec2d(1.0 / param.f[0], 1.0 / param.f[1]));
-        ptr_d[i][0] = ptr_d[i][0] - param.alpha * ptr_d[i][1];
+        ptr_d[i][0] -= param.alpha * ptr_d[i][1];
     }
     cv::fisheye::undistortPoints(distorted, undistorted, Matx33d::eye(), param.k);
     return undistorted;
@@ -1317,12 +1317,11 @@ cv::Mat cv::internal::NormalizePixels(const Mat& imagePoints, const IntrinsicPar
 
 void cv::internal::InitExtrinsics(const Mat& _imagePoints, const Mat& _objectPoints, const IntrinsicParams& param, Mat& omckk, Mat& Tckk)
 {
-
     CV_Assert(!_objectPoints.empty() && _objectPoints.type() == CV_64FC3);
     CV_Assert(!_imagePoints.empty() && _imagePoints.type() == CV_64FC2);
 
-    Mat imagePointsNormalized = NormalizePixels(_imagePoints.t(), param).reshape(1).t();
-    Mat objectPoints = Mat(_objectPoints.t()).reshape(1).t();
+    Mat imagePointsNormalized = NormalizePixels(_imagePoints, param).reshape(1).t();
+    Mat objectPoints = _objectPoints.reshape(1).t();
     Mat objectPointsMean, covObjectPoints;
     Mat Rckk;
     int Np = imagePointsNormalized.cols;
@@ -1375,9 +1374,12 @@ void cv::internal::CalibrateExtrinsics(InputArrayOfArrays objectPoints, InputArr
         objectPoints.getMat(image_idx).convertTo(object,  CV_64FC3);
         imagePoints.getMat (image_idx).convertTo(image, CV_64FC2);
 
-        InitExtrinsics(image, object, param, omckk, Tckk);
+        bool imT = image.rows < image.cols;
+        bool obT = object.rows < object.cols;
+
+        InitExtrinsics(imT ? image.t() : image, obT ? object.t() : object, param, omckk, Tckk);
 
-        ComputeExtrinsicRefine(image, object, omckk, Tckk, JJ_kk, maxIter, param, thresh_cond);
+        ComputeExtrinsicRefine(!imT ? image.t() : image, !obT ? object.t() : object, omckk, Tckk, JJ_kk, maxIter, param, thresh_cond);
         if (check_cond)
         {
             SVD svd(JJ_kk, SVD::NO_UV);
@@ -1388,7 +1390,6 @@ void cv::internal::CalibrateExtrinsics(InputArrayOfArrays objectPoints, InputArr
     }
 }
 
-
 void cv::internal::ComputeJacobians(InputArrayOfArrays objectPoints, InputArrayOfArrays imagePoints,
                       const IntrinsicParams& param,  InputArray omc, InputArray Tc,
                       const int& check_cond, const double& thresh_cond, Mat& JJ2, Mat& ex3)
@@ -1410,12 +1411,13 @@ void cv::internal::ComputeJacobians(InputArrayOfArrays objectPoints, InputArrayO
         objectPoints.getMat(image_idx).convertTo(object, CV_64FC3);
         imagePoints.getMat (image_idx).convertTo(image, CV_64FC2);
 
+        bool imT = image.rows < image.cols;
         Mat om(omc.getMat().col(image_idx)), T(Tc.getMat().col(image_idx));
 
         std::vector<Point2d> x;
         Mat jacobians;
         projectPoints(object, x, om, T, param, jacobians);
-        Mat exkk = image.t() - Mat(x);
+        Mat exkk = (imT ? image.t() : image) - Mat(x);
 
         Mat A(jacobians.rows, 9, CV_64FC1);
         jacobians.colRange(0, 4).copyTo(A.colRange(0, 4));
@@ -1469,11 +1471,13 @@ void cv::internal::EstimateUncertainties(InputArrayOfArrays objectPoints, InputA
         objectPoints.getMat(image_idx).convertTo(object, CV_64FC3);
         imagePoints.getMat (image_idx).convertTo(image, CV_64FC2);
 
+        bool imT = image.rows < image.cols;
+
         Mat om(omc.getMat().col(image_idx)), T(Tc.getMat().col(image_idx));
 
         std::vector<Point2d> x;
         projectPoints(object, x, om, T, params, noArray());
-        Mat ex_ = image.t() - Mat(x);
+        Mat ex_ = (imT ? image.t() : image) - Mat(x);
         ex_.copyTo(ex.rowRange(ex_.rows * image_idx,  ex_.rows * (image_idx + 1)));
     }