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Merge pull request opencv#9406 from Cartucho:update_core_tutorials
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‎doc/tutorials/core/adding_images/adding_images.markdown

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Adding (blending) two images using OpenCV {#tutorial_adding_images}
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=========================================
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@prev_tutorial{tutorial_mat_operations}
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@next_tutorial{tutorial_basic_linear_transform}
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Goal
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----
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In this tutorial you will learn:
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- what is *linear blending* and why it is useful;
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- how to add two images using @ref cv::addWeighted
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- how to add two images using **addWeighted()**
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Theory
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------
@@ -28,33 +31,83 @@ eh?)
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Source Code
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-----------
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@add_toggle_cpp
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Download the source code from
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[here](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/core/AddingImages/AddingImages.cpp).
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[here](https://raw.githubusercontent.com/opencv/opencv/master/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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@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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@include python/tutorial_code/core/AddingImages/adding_images.py
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@end_toggle
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Explanation
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-----------
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-# Since we are going to perform:
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Since we are going to perform:
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\f[g(x) = (1 - \alpha)f_{0}(x) + \alpha f_{1}(x)\f]
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We need two source images (\f$f_{0}(x)\f$ and \f$f_{1}(x)\f$). So, we load them in the usual way:
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@add_toggle_cpp
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@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp load
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@end_toggle
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@add_toggle_java
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@snippet java/tutorial_code/core/AddingImages/AddingImages.java load
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@end_toggle
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@add_toggle_python
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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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@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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Now we need to generate the `g(x)` image. For this, the function **addWeighted()** comes quite handy:
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@add_toggle_cpp
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@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp blend_images
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@end_toggle
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\f[g(x) = (1 - \alpha)f_{0}(x) + \alpha f_{1}(x)\f]
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@add_toggle_java
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@snippet java/tutorial_code/core/AddingImages/AddingImages.java blend_images
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@end_toggle
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We need two source images (\f$f_{0}(x)\f$ and \f$f_{1}(x)\f$). So, we load them in the usual way:
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@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp load
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@add_toggle_python
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@snippet python/tutorial_code/core/AddingImages/adding_images.py blend_images
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Numpy version of above line (but cv2 function is around 2x faster):
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\code{.py}
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dst = np.uint8(alpha*(img1)+beta*(img2))
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\endcode
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@end_toggle
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**warning**
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since **addWeighted()** produces:
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\f[dst = \alpha \cdot src1 + \beta \cdot src2 + \gamma\f]
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In this case, `gamma` is the argument \f$0.0\f$ in the code above.
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Since we are *adding* *src1* and *src2*, they both have to be of the same size (width and
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height) and type.
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Create windows, show the images and wait for the user to end the program.
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@add_toggle_cpp
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@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp display
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@end_toggle
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-# Now we need to generate the `g(x)` image. For this, the function @ref cv::addWeighted comes quite handy:
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@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp blend_images
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since @ref cv::addWeighted produces:
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\f[dst = \alpha \cdot src1 + \beta \cdot src2 + \gamma\f]
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In this case, `gamma` is the argument \f$0.0\f$ in the code above.
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@add_toggle_java
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@snippet java/tutorial_code/core/AddingImages/AddingImages.java display
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@end_toggle
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-# Create windows, show the images and wait for the user to end the program.
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@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp display
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@add_toggle_python
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@snippet python/tutorial_code/core/AddingImages/adding_images.py display
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@end_toggle
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Result
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------

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