fix 4.x links
This commit is contained in:
Alexander Alekhin
@@ -41,19 +41,19 @@ Source Code
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@add_toggle_cpp
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Download the source code from
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[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/core/AddingImages/AddingImages.cpp).
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[here](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/cpp/tutorial_code/core/AddingImages/AddingImages.cpp).
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@include cpp/tutorial_code/core/AddingImages/AddingImages.cpp
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@end_toggle
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@add_toggle_java
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Download the source code from
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[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/core/AddingImages/AddingImages.java).
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[here](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/java/tutorial_code/core/AddingImages/AddingImages.java).
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@include java/tutorial_code/core/AddingImages/AddingImages.java
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@end_toggle
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@add_toggle_python
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Download the source code from
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[here](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/core/AddingImages/adding_images.py).
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[here](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/python/tutorial_code/core/AddingImages/adding_images.py).
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@include python/tutorial_code/core/AddingImages/adding_images.py
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@end_toggle
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@@ -77,7 +77,7 @@ We need two source images (\f$f_{0}(x)\f$ and \f$f_{1}(x)\f$). So, we load them
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@snippet python/tutorial_code/core/AddingImages/adding_images.py load
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@end_toggle
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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)
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We used the following images: [LinuxLogo.jpg](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/data/LinuxLogo.jpg) and [WindowsLogo.jpg](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/data/WindowsLogo.jpg)
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@warning Since we are *adding* *src1* and *src2*, they both have to be of the same size
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(width and height) and type.
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@@ -65,7 +65,7 @@ Code
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@add_toggle_cpp
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- **Downloadable code**: Click
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[here](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/ImgProc/BasicLinearTransforms.cpp)
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[here](https://github.com/opencv/opencv/tree/4.x/samples/cpp/tutorial_code/ImgProc/BasicLinearTransforms.cpp)
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- The following code performs the operation \f$g(i,j) = \alpha \cdot f(i,j) + \beta\f$ :
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@include samples/cpp/tutorial_code/ImgProc/BasicLinearTransforms.cpp
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@@ -73,7 +73,7 @@ Code
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@add_toggle_java
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- **Downloadable code**: Click
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[here](https://github.com/opencv/opencv/tree/master/samples/java/tutorial_code/ImgProc/changing_contrast_brightness_image/BasicLinearTransformsDemo.java)
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[here](https://github.com/opencv/opencv/tree/4.x/samples/java/tutorial_code/ImgProc/changing_contrast_brightness_image/BasicLinearTransformsDemo.java)
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- The following code performs the operation \f$g(i,j) = \alpha \cdot f(i,j) + \beta\f$ :
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@include samples/java/tutorial_code/ImgProc/changing_contrast_brightness_image/BasicLinearTransformsDemo.java
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@@ -81,7 +81,7 @@ Code
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@add_toggle_python
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- **Downloadable code**: Click
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[here](https://github.com/opencv/opencv/tree/master/samples/python/tutorial_code/imgProc/changing_contrast_brightness_image/BasicLinearTransforms.py)
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[here](https://github.com/opencv/opencv/tree/4.x/samples/python/tutorial_code/imgProc/changing_contrast_brightness_image/BasicLinearTransforms.py)
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- The following code performs the operation \f$g(i,j) = \alpha \cdot f(i,j) + \beta\f$ :
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@include samples/python/tutorial_code/imgProc/changing_contrast_brightness_image/BasicLinearTransforms.py
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@@ -291,15 +291,15 @@ and are not intended to be used as a replacement of a raster graphics editor!**
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### Code
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@add_toggle_cpp
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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).
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Code for the tutorial is [here](https://github.com/opencv/opencv/blob/4.x/samples/cpp/tutorial_code/ImgProc/changing_contrast_brightness_image/changing_contrast_brightness_image.cpp).
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@end_toggle
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@add_toggle_java
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Code for the tutorial is [here](https://github.com/opencv/opencv/blob/master/samples/java/tutorial_code/ImgProc/changing_contrast_brightness_image/ChangingContrastBrightnessImageDemo.java).
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Code for the tutorial is [here](https://github.com/opencv/opencv/blob/4.x/samples/java/tutorial_code/ImgProc/changing_contrast_brightness_image/ChangingContrastBrightnessImageDemo.java).
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@end_toggle
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@add_toggle_python
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Code for the tutorial is [here](https://github.com/opencv/opencv/blob/master/samples/python/tutorial_code/imgProc/changing_contrast_brightness_image/changing_contrast_brightness_image.py).
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Code for the tutorial is [here](https://github.com/opencv/opencv/blob/4.x/samples/python/tutorial_code/imgProc/changing_contrast_brightness_image/changing_contrast_brightness_image.py).
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@end_toggle
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Code for the gamma correction:
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@@ -26,7 +26,7 @@ Source code
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@add_toggle_cpp
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You can [download this from here
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](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.cpp) or
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](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/cpp/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.cpp) or
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find it in the
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`samples/cpp/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.cpp` of the
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OpenCV source code library.
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@@ -34,7 +34,7 @@ OpenCV source code library.
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@add_toggle_java
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You can [download this from here
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](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/core/discrete_fourier_transform/DiscreteFourierTransform.java) or
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](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/java/tutorial_code/core/discrete_fourier_transform/DiscreteFourierTransform.java) or
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find it in the
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`samples/java/tutorial_code/core/discrete_fourier_transform/DiscreteFourierTransform.java` of the
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OpenCV source code library.
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@@ -42,7 +42,7 @@ OpenCV source code library.
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@add_toggle_python
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You can [download this from here
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](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.py) or
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](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/python/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.py) or
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find it in the
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`samples/python/tutorial_code/core/discrete_fourier_transform/discrete_fourier_transform.py` of the
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OpenCV source code library.
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@@ -229,7 +229,7 @@ An application idea would be to determine the geometrical orientation present in
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example, let us find out if a text is horizontal or not? Looking at some text you'll notice that the
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text lines sort of form also horizontal lines and the letters form sort of vertical lines. These two
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main components of a text snippet may be also seen in case of the Fourier transform. Let us use
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[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)
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[this horizontal ](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/data/imageTextN.png) and [this rotated](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/data/imageTextR.png)
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image about a text.
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In case of the horizontal text:
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+2
-2
@@ -26,7 +26,7 @@ Source code
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-----------
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@add_toggle_cpp
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You can [download this from here
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](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/core/file_input_output/file_input_output.cpp) or find it in the
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](https://github.com/opencv/opencv/tree/4.x/samples/cpp/tutorial_code/core/file_input_output/file_input_output.cpp) or find it in the
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`samples/cpp/tutorial_code/core/file_input_output/file_input_output.cpp` of the OpenCV source code
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library.
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@@ -37,7 +37,7 @@ Here's a sample code of how to achieve all the stuff enumerated at the goal list
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@add_toggle_python
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You can [download this from here
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](https://github.com/opencv/opencv/tree/master/samples/python/tutorial_code/core/file_input_output/file_input_output.py) or find it in the
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](https://github.com/opencv/opencv/tree/4.x/samples/python/tutorial_code/core/file_input_output/file_input_output.py) or find it in the
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`samples/python/tutorial_code/core/file_input_output/file_input_output.py` of the OpenCV source code
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library.
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@@ -61,7 +61,7 @@ three major ways of going through an image pixel by pixel. To make things a litt
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we'll make the scanning of the image using each of these methods, and print out how long it took.
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You can download the full source code [here
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](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp) or look it up in
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](https://github.com/opencv/opencv/tree/4.x/samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp) or look it up in
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the samples directory of OpenCV at the cpp tutorial code for the core section. Its basic usage is:
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@code{.bash}
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how_to_scan_images imageName.jpg intValueToReduce [G]
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+2
-2
@@ -15,7 +15,7 @@ Goal
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The goal of this tutorial is to show you how to use the OpenCV `parallel_for_` framework to easily
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parallelize your code. To illustrate the concept, we will write a program to draw a Mandelbrot set
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exploiting almost all the CPU load available.
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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).
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The full tutorial code is [here](https://github.com/opencv/opencv/blob/4.x/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp).
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If you want more information about multithreading, you will have to refer to a reference book or course as this tutorial is intended
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to remain simple.
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@@ -183,7 +183,7 @@ C++ 11 standard allows to simplify the parallel implementation by get rid of the
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Results
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-----------
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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).
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You can find the full tutorial code [here](https://github.com/opencv/opencv/blob/4.x/samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp).
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The performance of the parallel implementation depends of the type of CPU you have. For instance, on 4 cores / 8 threads
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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.
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Main reasons should be mostly due to:
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@@ -40,7 +40,7 @@ Code
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@add_toggle_cpp
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You can download this source code from [here
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](https://raw.githubusercontent.com/opencv/opencv/master/samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp) or look in the
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](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp) or look in the
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OpenCV source code libraries sample directory at
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`samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp`.
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@include samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp
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@@ -48,7 +48,7 @@ OpenCV source code libraries sample directory at
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@add_toggle_java
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You can download this source code from [here
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](https://raw.githubusercontent.com/opencv/opencv/master/samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java) or look in the
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](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java) or look in the
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OpenCV source code libraries sample directory at
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`samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java`.
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@include samples/java/tutorial_code/core/mat_mask_operations/MatMaskOperations.java
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@@ -56,7 +56,7 @@ OpenCV source code libraries sample directory at
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@add_toggle_python
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You can download this source code from [here
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](https://raw.githubusercontent.com/opencv/opencv/master/samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py) or look in the
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](https://raw.githubusercontent.com/opencv/opencv/4.x/samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py) or look in the
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OpenCV source code libraries sample directory at
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`samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py`.
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@include samples/python/tutorial_code/core/mat_mask_operations/mat_mask_operations.py
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+1
-1
@@ -269,7 +269,7 @@ OpenCV offers support for output of other common OpenCV data structures too via
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Most of the samples here have been included in a small console application. You can download it from
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[here](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/core/mat_the_basic_image_container/mat_the_basic_image_container.cpp)
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[here](https://github.com/opencv/opencv/tree/4.x/samples/cpp/tutorial_code/core/mat_the_basic_image_container/mat_the_basic_image_container.cpp)
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or in the core section of the cpp samples.
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You can also find a quick video demonstration of this on
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@@ -245,7 +245,7 @@ In the following section, we will vectorize a simple convolution function for si
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You may learn more about convolution from the previous tutorial. We use the same naive implementation from the previous tutorial and compare it to the vectorized version.
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The full tutorial code is [here](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/univ_intrin/univ_intrin.cpp).
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The full tutorial code is [here](https://github.com/opencv/opencv/tree/4.x/samples/cpp/tutorial_code/univ_intrin/univ_intrin.cpp).
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### Vectorizing Convolution
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