diff --git a/doc/tutorials/core/adding_images/adding_images.markdown b/doc/tutorials/core/adding_images/adding_images.markdown
index c8776325a3..0da6d2d33e 100644
--- a/doc/tutorials/core/adding_images/adding_images.markdown
+++ b/doc/tutorials/core/adding_images/adding_images.markdown
@@ -33,19 +33,19 @@ Source Code
 
 @add_toggle_cpp
 Download the source code from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/core/AddingImages/AddingImages.cpp).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/core/AddingImages/AddingImages.cpp).
 @include cpp/tutorial_code/core/AddingImages/AddingImages.cpp
 @end_toggle
 
 @add_toggle_java
 Download the source code from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/core/AddingImages/AddingImages.java).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/core/AddingImages/AddingImages.java).
 @include java/tutorial_code/core/AddingImages/AddingImages.java
 @end_toggle
 
 @add_toggle_python
 Download the source code from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/core/AddingImages/adding_images.py).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/core/AddingImages/adding_images.py).
 @include python/tutorial_code/core/AddingImages/adding_images.py
 @end_toggle
 
@@ -69,7 +69,7 @@ We need two source images (\f$f_{0}(x)\f$ and \f$f_{1}(x)\f$). So, we load them
 @snippet python/tutorial_code/core/AddingImages/adding_images.py load
 @end_toggle
 
-We used the following images: [LinuxLogo.jpg](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/LinuxLogo.jpg) and [WindowsLogo.jpg](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/WindowsLogo.jpg)
+We used the following images: [LinuxLogo.jpg](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/LinuxLogo.jpg) and [WindowsLogo.jpg](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/WindowsLogo.jpg)
 
 @warning Since we are *adding* *src1* and *src2*, they both have to be of the same size
 (width and height) and type.
diff --git a/doc/tutorials/core/basic_geometric_drawing/basic_geometric_drawing.markdown b/doc/tutorials/core/basic_geometric_drawing/basic_geometric_drawing.markdown
index ec3a2ffadc..02ec53cb3f 100644
--- a/doc/tutorials/core/basic_geometric_drawing/basic_geometric_drawing.markdown
+++ b/doc/tutorials/core/basic_geometric_drawing/basic_geometric_drawing.markdown
@@ -82,19 +82,19 @@ Code
 
 @add_toggle_cpp
 -   This code is in your OpenCV sample folder. Otherwise you can grab it from
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/core/Matrix/Drawing_1.cpp)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/core/Matrix/Drawing_1.cpp)
     @include samples/cpp/tutorial_code/core/Matrix/Drawing_1.cpp
 @end_toggle
 
 @add_toggle_java
 -   This code is in your OpenCV sample folder. Otherwise you can grab it from
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/core/BasicGeometricDrawing/BasicGeometricDrawing.java)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/core/BasicGeometricDrawing/BasicGeometricDrawing.java)
     @include samples/java/tutorial_code/core/BasicGeometricDrawing/BasicGeometricDrawing.java
 @end_toggle
 
 @add_toggle_python
 -   This code is in your OpenCV sample folder. Otherwise you can grab it from
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/core/BasicGeometricDrawing/basic_geometric_drawing.py)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/core/BasicGeometricDrawing/basic_geometric_drawing.py)
     @include samples/python/tutorial_code/core/BasicGeometricDrawing/basic_geometric_drawing.py
 @end_toggle
 
diff --git a/doc/tutorials/core/basic_linear_transform/basic_linear_transform.markdown b/doc/tutorials/core/basic_linear_transform/basic_linear_transform.markdown
index a035199ee9..58d37c8570 100644
--- a/doc/tutorials/core/basic_linear_transform/basic_linear_transform.markdown
+++ b/doc/tutorials/core/basic_linear_transform/basic_linear_transform.markdown
@@ -185,7 +185,7 @@ and are not intended to be used as a replacement of a raster graphics editor!**
 
 ### Code
 
-Code for the tutorial is [here](https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/ImgProc/changing_contrast_brightness_image/changing_contrast_brightness_image.cpp).
+Code for the tutorial is [here](https://github.com/opencv/opencv/blob/3.4/samples/cpp/tutorial_code/ImgProc/changing_contrast_brightness_image/changing_contrast_brightness_image.cpp).
 Code for the gamma correction:
 
 @snippet changing_contrast_brightness_image.cpp changing-contrast-brightness-gamma-correction
diff --git a/doc/tutorials/core/discrete_fourier_transform/discrete_fourier_transform.markdown b/doc/tutorials/core/discrete_fourier_transform/discrete_fourier_transform.markdown
index 32536a5632..7facd74ca9 100644
--- a/doc/tutorials/core/discrete_fourier_transform/discrete_fourier_transform.markdown
+++ b/doc/tutorials/core/discrete_fourier_transform/discrete_fourier_transform.markdown
@@ -19,7 +19,7 @@ Source code
 
 @add_toggle_cpp
 You can [download this from here
-](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.cpp) or
+](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.cpp) or
 find it in the
 `samples/cpp/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.cpp` of the
 OpenCV source code library.
@@ -27,7 +27,7 @@ OpenCV source code library.
 
 @add_toggle_java
 You can [download this from here
-](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/core/discrete_fourier_transform/DiscreteFourierTransform.java) or
+](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/core/discrete_fourier_transform/DiscreteFourierTransform.java) or
 find it in the
 `samples/java/tutorial_code/core/discrete_fourier_transform/DiscreteFourierTransform.java` of the
 OpenCV source code library.
@@ -35,7 +35,7 @@ OpenCV source code library.
 
 @add_toggle_python
 You can [download this from here
-](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.py) or
+](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.py) or
 find it in the
 `samples/python/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.py` of the
 OpenCV source code library.
@@ -222,7 +222,7 @@ An application idea would be to determine the geometrical orientation present in
 example, let us find out if a text is horizontal or not? Looking at some text you'll notice that the
 text lines sort of form also horizontal lines and the letters form sort of vertical lines. These two
 main components of a text snippet may be also seen in case of the Fourier transform. Let us use
-[this horizontal ](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/imageTextN.png) and [this rotated](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/imageTextR.png)
+[this horizontal ](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/imageTextN.png) and [this rotated](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/imageTextR.png)
 image about a text.
 
 In case of the horizontal text:
diff --git a/doc/tutorials/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.markdown b/doc/tutorials/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.markdown
index 18988a5535..c584a97c8a 100644
--- a/doc/tutorials/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.markdown
+++ b/doc/tutorials/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.markdown
@@ -7,7 +7,7 @@ Goal
 The goal of this tutorial is to show you how to use the OpenCV `parallel_for_` framework to easily
 parallelize your code. To illustrate the concept, we will write a program to draw a Mandelbrot set
 exploiting almost all the CPU load available.
-The full tutorial code is [here](https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp).
+The full tutorial code is [here](https://github.com/opencv/opencv/blob/3.4/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp).
 If you want more information about multithreading, you will have to refer to a reference book or course as this tutorial is intended
 to remain simple.
 
@@ -175,7 +175,7 @@ C++ 11 standard allows to simplify the parallel implementation by get rid of the
 Results
 -----------
 
-You can find the full tutorial code [here](https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp).
+You can find the full tutorial code [here](https://github.com/opencv/opencv/blob/3.4/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp).
 The performance of the parallel implementation depends of the type of CPU you have. For instance, on 4 cores / 8 threads
 CPU, you can expect a speed-up of around 6.9X. There are many factors to explain why we do not achieve a speed-up of almost 8X.
 Main reasons should be mostly due to:
diff --git a/doc/tutorials/core/mat-mask-operations/mat_mask_operations.markdown b/doc/tutorials/core/mat-mask-operations/mat_mask_operations.markdown
index 8e1febebff..bd74267f54 100644
--- a/doc/tutorials/core/mat-mask-operations/mat_mask_operations.markdown
+++ b/doc/tutorials/core/mat-mask-operations/mat_mask_operations.markdown
@@ -33,7 +33,7 @@ Code
 
 @add_toggle_cpp
 You can download this source code from [here
-](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp) or look in the
+](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp) or look in the
 OpenCV source code libraries sample directory at
 `samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp`.
 @include samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp
@@ -41,7 +41,7 @@ OpenCV source code libraries sample directory at
 
 @add_toggle_java
 You can download this source code from [here
-](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java) or look in the
+](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java) or look in the
 OpenCV source code libraries sample directory at
 `samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java`.
 @include samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java
@@ -49,7 +49,7 @@ OpenCV source code libraries sample directory at
 
 @add_toggle_python
 You can download this source code from [here
-](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py) or look in the
+](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py) or look in the
 OpenCV source code libraries sample directory at
 `samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py`.
 @include samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py
diff --git a/doc/tutorials/dnn/dnn_googlenet/dnn_googlenet.markdown b/doc/tutorials/dnn/dnn_googlenet/dnn_googlenet.markdown
index e65f70044b..1f26c37035 100644
--- a/doc/tutorials/dnn/dnn_googlenet/dnn_googlenet.markdown
+++ b/doc/tutorials/dnn/dnn_googlenet/dnn_googlenet.markdown
@@ -13,7 +13,7 @@ We will demonstrate results of this example on the following picture.
 Source Code
 -----------
 
-We will be using snippets from the example application, that can be downloaded [here](https://github.com/opencv/opencv/blob/master/samples/dnn/classification.cpp).
+We will be using snippets from the example application, that can be downloaded [here](https://github.com/opencv/opencv/blob/3.4/samples/dnn/classification.cpp).
 
 @include dnn/classification.cpp
 
diff --git a/doc/tutorials/dnn/dnn_yolo/dnn_yolo.markdown b/doc/tutorials/dnn/dnn_yolo/dnn_yolo.markdown
index 968b3faaca..76bf0edd25 100644
--- a/doc/tutorials/dnn/dnn_yolo/dnn_yolo.markdown
+++ b/doc/tutorials/dnn/dnn_yolo/dnn_yolo.markdown
@@ -19,8 +19,8 @@ Source Code
 -----------
 
 Use a universal sample for object detection models written
-[in C++](https://github.com/opencv/opencv/blob/master/samples/dnn/object_detection.cpp) and
-[in Python](https://github.com/opencv/opencv/blob/master/samples/dnn/object_detection.py) languages
+[in C++](https://github.com/opencv/opencv/blob/3.4/samples/dnn/object_detection.cpp) and
+[in Python](https://github.com/opencv/opencv/blob/3.4/samples/dnn/object_detection.py) languages
 
 Usage examples
 --------------
diff --git a/doc/tutorials/imgproc/gausian_median_blur_bilateral_filter/gausian_median_blur_bilateral_filter.markdown b/doc/tutorials/imgproc/gausian_median_blur_bilateral_filter/gausian_median_blur_bilateral_filter.markdown
index e8f678c57f..332d894062 100644
--- a/doc/tutorials/imgproc/gausian_median_blur_bilateral_filter/gausian_median_blur_bilateral_filter.markdown
+++ b/doc/tutorials/imgproc/gausian_median_blur_bilateral_filter/gausian_median_blur_bilateral_filter.markdown
@@ -97,7 +97,7 @@ Code
 
 @add_toggle_cpp
 -   **Downloadable code**: Click
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgProc/Smoothing/Smoothing.cpp)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgProc/Smoothing/Smoothing.cpp)
 
 -   **Code at glance:**
     @include samples/cpp/tutorial_code/ImgProc/Smoothing/Smoothing.cpp
@@ -105,7 +105,7 @@ Code
 
 @add_toggle_java
 -   **Downloadable code**: Click
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgProc/Smoothing/Smoothing.java)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgProc/Smoothing/Smoothing.java)
 
 -   **Code at glance:**
     @include samples/java/tutorial_code/ImgProc/Smoothing/Smoothing.java
@@ -113,7 +113,7 @@ Code
 
 @add_toggle_python
 -   **Downloadable code**: Click
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/imgProc/Smoothing/smoothing.py)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/imgProc/Smoothing/smoothing.py)
 
 -   **Code at glance:**
     @include samples/python/tutorial_code/imgProc/Smoothing/smoothing.py
@@ -220,7 +220,7 @@ already known by now.
 Results
 -------
 
--   The code opens an image (in this case [lena.jpg](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/lena.jpg))
+-   The code opens an image (in this case [lena.jpg](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/lena.jpg))
     and display it under the effects of the 4 filters explained.
 -   Here is a snapshot of the image smoothed using *medianBlur*:
 
diff --git a/doc/tutorials/imgproc/hitOrMiss/hitOrMiss.markdown b/doc/tutorials/imgproc/hitOrMiss/hitOrMiss.markdown
index c55f09296f..efb1f232db 100644
--- a/doc/tutorials/imgproc/hitOrMiss/hitOrMiss.markdown
+++ b/doc/tutorials/imgproc/hitOrMiss/hitOrMiss.markdown
@@ -48,19 +48,19 @@ The code corresponding to the previous example is shown below.
 
 @add_toggle_cpp
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgProc/HitMiss/HitMiss.cpp)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgProc/HitMiss/HitMiss.cpp)
 @include samples/cpp/tutorial_code/ImgProc/HitMiss/HitMiss.cpp
 @end_toggle
 
 @add_toggle_java
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgProc/HitMiss/HitMiss.java)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgProc/HitMiss/HitMiss.java)
 @include samples/java/tutorial_code/ImgProc/HitMiss/HitMiss.java
 @end_toggle
 
 @add_toggle_python
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/imgProc/HitMiss/hit_miss.py)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/imgProc/HitMiss/hit_miss.py)
 @include samples/python/tutorial_code/imgProc/HitMiss/hit_miss.py
 @end_toggle
 
diff --git a/doc/tutorials/imgproc/imgtrans/copyMakeBorder/copyMakeBorder.markdown b/doc/tutorials/imgproc/imgtrans/copyMakeBorder/copyMakeBorder.markdown
index 8a4bbc0702..aba46bdab3 100644
--- a/doc/tutorials/imgproc/imgtrans/copyMakeBorder/copyMakeBorder.markdown
+++ b/doc/tutorials/imgproc/imgtrans/copyMakeBorder/copyMakeBorder.markdown
@@ -52,19 +52,19 @@ The tutorial code's is shown lines below.
 
 @add_toggle_cpp
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp)
 @include samples/cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp
 @end_toggle
 
 @add_toggle_java
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java)
 @include samples/java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java
 @end_toggle
 
 @add_toggle_python
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py)
 @include samples/python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py
 @end_toggle
 
diff --git a/doc/tutorials/imgproc/imgtrans/filter_2d/filter_2d.markdown b/doc/tutorials/imgproc/imgtrans/filter_2d/filter_2d.markdown
index 454f745177..3dea827a4b 100644
--- a/doc/tutorials/imgproc/imgtrans/filter_2d/filter_2d.markdown
+++ b/doc/tutorials/imgproc/imgtrans/filter_2d/filter_2d.markdown
@@ -68,19 +68,19 @@ The tutorial code's is shown in the lines below.
 
 @add_toggle_cpp
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/filter2D_demo.cpp)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/filter2D_demo.cpp)
 @include cpp/tutorial_code/ImgTrans/filter2D_demo.cpp
 @end_toggle
 
 @add_toggle_java
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgTrans/Filter2D/Filter2D_Demo.java)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgTrans/Filter2D/Filter2D_Demo.java)
 @include java/tutorial_code/ImgTrans/Filter2D/Filter2D_Demo.java
 @end_toggle
 
 @add_toggle_python
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/ImgTrans/Filter2D/filter2D.py)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/ImgTrans/Filter2D/filter2D.py)
 @include python/tutorial_code/ImgTrans/Filter2D/filter2D.py
 @end_toggle
 
diff --git a/doc/tutorials/imgproc/imgtrans/hough_circle/hough_circle.markdown b/doc/tutorials/imgproc/imgtrans/hough_circle/hough_circle.markdown
index fe2f88be15..c4a9989e2b 100644
--- a/doc/tutorials/imgproc/imgtrans/hough_circle/hough_circle.markdown
+++ b/doc/tutorials/imgproc/imgtrans/hough_circle/hough_circle.markdown
@@ -44,28 +44,28 @@ Code
 
 @add_toggle_cpp
 The sample code that we will explain can be downloaded from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/houghcircles.cpp).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/houghcircles.cpp).
 A slightly fancier version (which shows trackbars for changing the threshold values) can be found
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/HoughCircle_Demo.cpp).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/HoughCircle_Demo.cpp).
 @include samples/cpp/tutorial_code/ImgTrans/houghcircles.cpp
 @end_toggle
 
 @add_toggle_java
 The sample code that we will explain can be downloaded from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgTrans/HoughCircle/HoughCircles.java).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgTrans/HoughCircle/HoughCircles.java).
 @include samples/java/tutorial_code/ImgTrans/HoughCircle/HoughCircles.java
 @end_toggle
 
 @add_toggle_python
 The sample code that we will explain can be downloaded from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/ImgTrans/HoughCircle/hough_circle.py).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/ImgTrans/HoughCircle/hough_circle.py).
 @include samples/python/tutorial_code/ImgTrans/HoughCircle/hough_circle.py
 @end_toggle
 
 Explanation
 -----------
 
-The image we used can be found [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/smarties.png)
+The image we used can be found [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/smarties.png)
 
 ####  Load an image:
 
diff --git a/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.markdown b/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.markdown
index 8b24d87a2d..d9687e2a1d 100644
--- a/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.markdown
+++ b/doc/tutorials/imgproc/imgtrans/hough_lines/hough_lines.markdown
@@ -100,22 +100,22 @@ Code
 
 @add_toggle_cpp
 The sample code that we will explain can be downloaded from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/houghlines.cpp).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/houghlines.cpp).
 A slightly fancier version (which shows both Hough standard and probabilistic
 with trackbars for changing the threshold values) can be found
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/HoughLines_Demo.cpp).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/HoughLines_Demo.cpp).
 @include samples/cpp/tutorial_code/ImgTrans/houghlines.cpp
 @end_toggle
 
 @add_toggle_java
 The sample code that we will explain can be downloaded from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgTrans/HoughLine/HoughLines.java).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgTrans/HoughLine/HoughLines.java).
 @include samples/java/tutorial_code/ImgTrans/HoughLine/HoughLines.java
 @end_toggle
 
 @add_toggle_python
 The sample code that we will explain can be downloaded from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/ImgTrans/HoughLine/hough_lines.py).
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/ImgTrans/HoughLine/hough_lines.py).
 @include samples/python/tutorial_code/ImgTrans/HoughLine/hough_lines.py
 @end_toggle
 
@@ -271,7 +271,7 @@ Result
     section. It still implements the same stuff as above, only adding the Trackbar for the
     Threshold.
 
-Using an input image such as a [sudoku image](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/sudoku.png).
+Using an input image such as a [sudoku image](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/sudoku.png).
 We get the following result by using the Standard Hough Line Transform:
 ![](images/hough_lines_result1.png)
 And by using the Probabilistic Hough Line Transform:
diff --git a/doc/tutorials/imgproc/imgtrans/laplace_operator/laplace_operator.markdown b/doc/tutorials/imgproc/imgtrans/laplace_operator/laplace_operator.markdown
index 63aed356b2..1ca525b5c6 100644
--- a/doc/tutorials/imgproc/imgtrans/laplace_operator/laplace_operator.markdown
+++ b/doc/tutorials/imgproc/imgtrans/laplace_operator/laplace_operator.markdown
@@ -55,19 +55,19 @@ Code
 
 @add_toggle_cpp
 -#  The tutorial code's is shown lines below. You can also download it from
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/Laplace_Demo.cpp)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/Laplace_Demo.cpp)
     @include samples/cpp/tutorial_code/ImgTrans/Laplace_Demo.cpp
 @end_toggle
 
 @add_toggle_java
 -#  The tutorial code's is shown lines below. You can also download it from
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgTrans/LaPlace/LaplaceDemo.java)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgTrans/LaPlace/LaplaceDemo.java)
     @include samples/java/tutorial_code/ImgTrans/LaPlace/LaplaceDemo.java
 @end_toggle
 
 @add_toggle_python
 -#  The tutorial code's is shown lines below. You can also download it from
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/ImgTrans/LaPlace/laplace_demo.py)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/ImgTrans/LaPlace/laplace_demo.py)
     @include samples/python/tutorial_code/ImgTrans/LaPlace/laplace_demo.py
 @end_toggle
 
diff --git a/doc/tutorials/imgproc/imgtrans/sobel_derivatives/sobel_derivatives.markdown b/doc/tutorials/imgproc/imgtrans/sobel_derivatives/sobel_derivatives.markdown
index f8725d2a12..cf335ee8f2 100644
--- a/doc/tutorials/imgproc/imgtrans/sobel_derivatives/sobel_derivatives.markdown
+++ b/doc/tutorials/imgproc/imgtrans/sobel_derivatives/sobel_derivatives.markdown
@@ -114,19 +114,19 @@ Code
 
 @add_toggle_cpp
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgTrans/Sobel_Demo.cpp)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgTrans/Sobel_Demo.cpp)
 @include samples/cpp/tutorial_code/ImgTrans/Sobel_Demo.cpp
 @end_toggle
 
 @add_toggle_java
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgTrans/SobelDemo/SobelDemo.java)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgTrans/SobelDemo/SobelDemo.java)
 @include samples/java/tutorial_code/ImgTrans/SobelDemo/SobelDemo.java
 @end_toggle
 
 @add_toggle_python
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/ImgTrans/SobelDemo/sobel_demo.py)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/ImgTrans/SobelDemo/sobel_demo.py)
 @include samples/python/tutorial_code/ImgTrans/SobelDemo/sobel_demo.py
 @end_toggle
 
diff --git a/doc/tutorials/imgproc/imgtrans/warp_affine/warp_affine.markdown b/doc/tutorials/imgproc/imgtrans/warp_affine/warp_affine.markdown
index c72fc29b15..3f25509dba 100644
--- a/doc/tutorials/imgproc/imgtrans/warp_affine/warp_affine.markdown
+++ b/doc/tutorials/imgproc/imgtrans/warp_affine/warp_affine.markdown
@@ -90,19 +90,19 @@ Code
 
 @add_toggle_cpp
 -   The tutorial's code is shown below. You can also download it
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgProc/Smoothing/Smoothing.cpp)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgProc/Smoothing/Smoothing.cpp)
     @include samples/cpp/tutorial_code/ImgTrans/Geometric_Transforms_Demo.cpp
 @end_toggle
 
 @add_toggle_java
 -   The tutorial's code is shown below. You can also download it
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgProc/Smoothing/Smoothing.cpp)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgProc/Smoothing/Smoothing.cpp)
     @include samples/java/tutorial_code/ImgTrans/warp_affine/GeometricTransformsDemo.java
 @end_toggle
 
 @add_toggle_python
 -   The tutorial's code is shown below. You can also download it
-    [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/ImgTrans/warp_affine/Geometric_Transforms_Demo.py)
+    [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/ImgTrans/warp_affine/Geometric_Transforms_Demo.py)
     @include samples/python/tutorial_code/ImgTrans/warp_affine/Geometric_Transforms_Demo.py
 @end_toggle
 
diff --git a/doc/tutorials/imgproc/morph_lines_detection/morph_lines_detection.md b/doc/tutorials/imgproc/morph_lines_detection/morph_lines_detection.md
index 4b0d3fae60..cf0e79755a 100644
--- a/doc/tutorials/imgproc/morph_lines_detection/morph_lines_detection.md
+++ b/doc/tutorials/imgproc/morph_lines_detection/morph_lines_detection.md
@@ -54,24 +54,24 @@ Code
 This tutorial code's is shown lines below.
 
 @add_toggle_cpp
-You can also download it from [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgProc/morph_lines_detection/Morphology_3.cpp).
+You can also download it from [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgProc/morph_lines_detection/Morphology_3.cpp).
 @include samples/cpp/tutorial_code/ImgProc/morph_lines_detection/Morphology_3.cpp
 @end_toggle
 
 @add_toggle_java
-You can also download it from [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgProc/morph_lines_detection/Morphology_3.java).
+You can also download it from [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgProc/morph_lines_detection/Morphology_3.java).
 @include samples/java/tutorial_code/ImgProc/morph_lines_detection/Morphology_3.java
 @end_toggle
 
 @add_toggle_python
-You can also download it from [here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/imgProc/morph_lines_detection/morph_lines_detection.py).
+You can also download it from [here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/imgProc/morph_lines_detection/morph_lines_detection.py).
 @include samples/python/tutorial_code/imgProc/morph_lines_detection/morph_lines_detection.py
 @end_toggle
 
 Explanation / Result
 --------------------
 
-Get image from [here](https://raw.githubusercontent.com/opencv/opencv/master/doc/tutorials/imgproc/morph_lines_detection/images/src.png) .
+Get image from [here](https://raw.githubusercontent.com/opencv/opencv/3.4/doc/tutorials/imgproc/morph_lines_detection/images/src.png) .
 
 #### Load Image
 
diff --git a/doc/tutorials/imgproc/pyramids/pyramids.markdown b/doc/tutorials/imgproc/pyramids/pyramids.markdown
index b832b22fb8..9b507e604e 100644
--- a/doc/tutorials/imgproc/pyramids/pyramids.markdown
+++ b/doc/tutorials/imgproc/pyramids/pyramids.markdown
@@ -72,19 +72,19 @@ This tutorial code's is shown lines below.
 
 @add_toggle_cpp
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/ImgProc/Pyramids/Pyramids.cpp)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/cpp/tutorial_code/ImgProc/Pyramids/Pyramids.cpp)
 @include samples/cpp/tutorial_code/ImgProc/Pyramids/Pyramids.cpp
 @end_toggle
 
 @add_toggle_java
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/ImgProc/Pyramids/Pyramids.java)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/java/tutorial_code/ImgProc/Pyramids/Pyramids.java)
 @include samples/java/tutorial_code/ImgProc/Pyramids/Pyramids.java
 @end_toggle
 
 @add_toggle_python
 You can also download it from
-[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/imgProc/Pyramids/pyramids.py)
+[here](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/python/tutorial_code/imgProc/Pyramids/pyramids.py)
 @include samples/python/tutorial_code/imgProc/Pyramids/pyramids.py
 @end_toggle
 
@@ -184,7 +184,7 @@ Otherwise, an error will be shown.
 Results
 -------
 
--   The program calls by default an image [chicky_512.png](https://raw.githubusercontent.com/opencv/opencv/master/samples/data/chicky_512.png)
+-   The program calls by default an image [chicky_512.png](https://raw.githubusercontent.com/opencv/opencv/3.4/samples/data/chicky_512.png)
     that comes in the `samples/data` folder. Notice that this image is \f$512 \times 512\f$,
     hence a downsample won't generate any error (\f$512 = 2^{9}\f$). The original image is shown below:
 
diff --git a/modules/dnn/test/pascal_semsegm_test_fcn.py b/modules/dnn/test/pascal_semsegm_test_fcn.py
index af4bc2aede..0de7bf0ee3 100644
--- a/modules/dnn/test/pascal_semsegm_test_fcn.py
+++ b/modules/dnn/test/pascal_semsegm_test_fcn.py
@@ -205,9 +205,9 @@ if __name__ == "__main__":
     parser.add_argument("--val_names", help="path to file with validation set image names, download it here: "
                         "https://github.com/shelhamer/fcn.berkeleyvision.org/blob/master/data/pascal/seg11valid.txt")
     parser.add_argument("--cls_file", help="path to file with colors for classes, download it here: "
-                        "https://github.com/opencv/opencv/blob/master/samples/data/dnn/pascal-classes.txt")
+                        "https://github.com/opencv/opencv/blob/3.4/samples/data/dnn/pascal-classes.txt")
     parser.add_argument("--prototxt", help="path to caffe prototxt, download it here: "
-                        "https://github.com/opencv/opencv/blob/master/samples/data/dnn/fcn8s-heavy-pascal.prototxt")
+                        "https://github.com/opencv/opencv/blob/3.4/samples/data/dnn/fcn8s-heavy-pascal.prototxt")
     parser.add_argument("--caffemodel", help="path to caffemodel file, download it here: "
                                              "http://dl.caffe.berkeleyvision.org/fcn8s-heavy-pascal.caffemodel")
     parser.add_argument("--log", help="path to logging file")
diff --git a/samples/dnn/README.md b/samples/dnn/README.md
index 4b1bcb8d0b..94460b3c0c 100644
--- a/samples/dnn/README.md
+++ b/samples/dnn/README.md
@@ -24,7 +24,7 @@ of values `(104, 177, 123)` for each blue, green and red channels correspondingl
 
 The following are accuracy metrics obtained using [COCO object detection evaluation
 tool](http://cocodataset.org/#detections-eval) on [FDDB dataset](http://vis-www.cs.umass.edu/fddb/)
-(see [script](https://github.com/opencv/opencv/blob/master/modules/dnn/misc/face_detector_accuracy.py))
+(see [script](https://github.com/opencv/opencv/blob/3.4/modules/dnn/misc/face_detector_accuracy.py))
 applying resize to `300x300` and keeping an origin images' sizes.
 ```
 AP - Average Precision                            | FP32/FP16 | UINT8          | FP32/FP16 | UINT8          |
diff --git a/samples/dnn/js_face_recognition.html b/samples/dnn/js_face_recognition.html
index 887f5f1bd8..bc94783c90 100644
--- a/samples/dnn/js_face_recognition.html
+++ b/samples/dnn/js_face_recognition.html
@@ -69,7 +69,7 @@ function recognize(face) {
 
 function loadModels(callback) {
   var utils = new Utils('');
-  var proto = 'https://raw.githubusercontent.com/opencv/opencv/master/samples/dnn/face_detector/deploy.prototxt';
+  var proto = 'https://raw.githubusercontent.com/opencv/opencv/3.4/samples/dnn/face_detector/deploy.prototxt';
   var weights = 'https://raw.githubusercontent.com/opencv/opencv_3rdparty/dnn_samples_face_detector_20180205_fp16/res10_300x300_ssd_iter_140000_fp16.caffemodel';
   var recognModel = 'https://raw.githubusercontent.com/pyannote/pyannote-data/master/openface.nn4.small2.v1.t7';
   utils.createFileFromUrl('face_detector.prototxt', proto, () => {