documentation: avoid links to 'master' branch from 3.4 maintenance branch (2)

Other links:
- https://raw.githubusercontent.com/opencv/opencv/master
- https://github.com/opencv/opencv/blob/master

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.

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
 

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

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:

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:

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

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
 

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
 --------------

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*:
 

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
 

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
 

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
 

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:
 

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:

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
 

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
 

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
 

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
 

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:
 

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")

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          |

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, () => {