Tutorial Adding Images

doc/tutorials/core/adding_images/adding_images.markdown

@@ -1,13 +1,16 @@
 Adding (blending) two images using OpenCV {#tutorial_adding_images}
 =========================================
 
+@prev_tutorial{tutorial_mat_operations}
+@next_tutorial{tutorial_basic_linear_transform}
+
 Goal
 ----
 
 In this tutorial you will learn:
 
 -   what is *linear blending* and why it is useful;
--   how to add two images using @ref cv::addWeighted
+-   how to add two images using **addWeighted()**
 
 Theory
 ------
@@ -28,33 +31,83 @@ eh?)
 Source Code
 -----------
 
+@add_toggle_cpp
 Download the source code from
-[here](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/core/AddingImages/AddingImages.cpp).
+[here](https://raw.githubusercontent.com/opencv/opencv/master/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).
+@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).
+@include python/tutorial_code/core/AddingImages/adding_images.py
+@end_toggle
 
 Explanation
 -----------
 
--#  Since we are going to perform:
+Since we are going to perform:
 
-    \f[g(x) = (1 - \alpha)f_{0}(x) + \alpha f_{1}(x)\f]
+\f[g(x) = (1 - \alpha)f_{0}(x) + \alpha f_{1}(x)\f]
 
-    We need two source images (\f$f_{0}(x)\f$ and \f$f_{1}(x)\f$). So, we load them in the usual way:
-    @snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp load
+We need two source images (\f$f_{0}(x)\f$ and \f$f_{1}(x)\f$). So, we load them in the usual way:
+@add_toggle_cpp
+@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp load
+@end_toggle
 
-    **warning**
+@add_toggle_java
+@snippet java/tutorial_code/core/AddingImages/AddingImages.java load
+@end_toggle
 
-    Since we are *adding* *src1* and *src2*, they both have to be of the same size (width and
-    height) and type.
+@add_toggle_python
+@snippet python/tutorial_code/core/AddingImages/adding_images.py load
+@end_toggle
 
--#  Now we need to generate the `g(x)` image. For this, the function @ref cv::addWeighted comes quite handy:
-    @snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp blend_images
-    since @ref cv::addWeighted  produces:
-    \f[dst = \alpha \cdot src1 + \beta \cdot src2 + \gamma\f]
-    In this case, `gamma` is the argument \f$0.0\f$ in the code above.
+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)
 
--#  Create windows, show the images and wait for the user to end the program.
-    @snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp display
+@warning Since we are *adding* *src1* and *src2*, they both have to be of the same size
+(width and height) and type.
+
+Now we need to generate the `g(x)` image. For this, the function **addWeighted()** comes quite handy:
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp blend_images
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/core/AddingImages/AddingImages.java blend_images
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/core/AddingImages/adding_images.py blend_images
+Numpy version of above line (but cv2 function is around 2x faster):
+\code{.py}
+    dst = np.uint8(alpha*(img1)+beta*(img2))
+\endcode
+@end_toggle
+
+since **addWeighted()**  produces:
+\f[dst = \alpha \cdot src1 + \beta \cdot src2 + \gamma\f]
+In this case, `gamma` is the argument \f$0.0\f$ in the code above.
+
+Create windows, show the images and wait for the user to end the program.
+@add_toggle_cpp
+@snippet cpp/tutorial_code/core/AddingImages/AddingImages.cpp display
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/core/AddingImages/AddingImages.java display
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/core/AddingImages/adding_images.py display
+@end_toggle
 
 Result
 ------

doc/tutorials/core/table_of_content_core.markdown

@@ -40,6 +40,8 @@ understanding how to manipulate the images on a pixel level.
 
 -   @subpage tutorial_adding_images
 
+    *Languages:* C++, Java, Python
+
     *Compatibility:* \> OpenCV 2.0
 
     *Author:* Ana Huamán