Tutorial Make Border

doc/tutorials/imgproc/imgtrans/copyMakeBorder/copyMakeBorder.markdown

 Adding borders to your images {#tutorial_copyMakeBorder}
 =============================
 
+@prev_tutorial{tutorial_filter_2d}
+@next_tutorial{tutorial_sobel_derivatives}
+
 Goal
 ----
 
 In this tutorial you will learn how to:
 
--   Use the OpenCV function @ref cv::copyMakeBorder to set the borders (extra padding to your
+-   Use the OpenCV function **copyMakeBorder()** to set the borders (extra padding to your
     image).
 
 Theory
@@ -30,10 +33,7 @@ Theory
 
     This will be seen more clearly in the Code section.
 
-Code
-----
-
--#  **What does this program do?**
+-   **What does this program do?**
     -   Load an image
     -   Let the user choose what kind of padding use in the input image. There are two options:
 
@@ -45,38 +45,153 @@ Code
         The user chooses either option by pressing 'c' (constant) or 'r' (replicate)
     -   The program finishes when the user presses 'ESC'
 
--#  The tutorial code's is shown lines below. You can also download it from
-    [here](https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp)
-    @include samples/cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp
+Code
+----
+
+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)
+@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)
+@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)
+@include samples/python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py
+@end_toggle
 
 Explanation
 -----------
 
--#  First we declare the variables we are going to use:
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp variables
+#### Declare the variables
+
+First we declare the variables we are going to use:
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp variables
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java variables
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py variables
+@end_toggle
+
+Especial attention deserves the variable *rng* which is a random number generator. We use it to
+generate the random border color, as we will see soon.
+
+#### Load an image
+
+As usual we load our source image *src*:
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp load
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java load
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py load
+@end_toggle
+
+#### Create a window
+
+After giving a short intro of how to use the program, we create a window:
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp create_window
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java create_window
+@end_toggle
 
-    Especial attention deserves the variable *rng* which is a random number generator. We use it to
-    generate the random border color, as we will see soon.
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py create_window
+@end_toggle
 
--#  As usual we load our source image *src*:
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp load
+#### Initialize arguments
 
--#  After giving a short intro of how to use the program, we create a window:
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp create_window
--#  Now we initialize the argument that defines the size of the borders (*top*, *bottom*, *left* and
-    *right*). We give them a value of 5% the size of *src*.
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp init_arguments
--#  The program runs in a **for** loop. If the user presses 'c' or 'r', the *borderType* variable
-    takes the value of *BORDER_CONSTANT* or *BORDER_REPLICATE* respectively:
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp check_keypress
--#  In each iteration (after 0.5 seconds), the variable *value* is updated...
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp update_value
-    with a random value generated by the **RNG** variable *rng*. This value is a number picked
-    randomly in the range \f$[0,255]\f$
+Now we initialize the argument that defines the size of the borders (*top*, *bottom*, *left* and
+*right*). We give them a value of 5% the size of *src*.
 
--#  Finally, we call the function @ref cv::copyMakeBorder to apply the respective padding:
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp copymakeborder
-    The arguments are:
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp init_arguments
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java init_arguments
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py init_arguments
+@end_toggle
+
+#### Loop
+
+The program runs in an infinite loop while the key **ESC** isn't pressed.
+If the user presses '**c**' or '**r**', the *borderType* variable
+takes the value of *BORDER_CONSTANT* or *BORDER_REPLICATE* respectively:
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp check_keypress
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java check_keypress
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py check_keypress
+@end_toggle
+
+#### Random color
+
+In each iteration (after 0.5 seconds), the random border color (*value*) is updated...
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp update_value
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java update_value
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py update_value
+@end_toggle
+
+This value is a set of three numbers picked randomly in the range \f$[0,255]\f$.
+
+#### Form a border around the image
+
+Finally, we call the function **copyMakeBorder()** to apply the respective padding:
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp copymakeborder
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java copymakeborder
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py copymakeborder
+@end_toggle
+
+-   The arguments are:
 
     -#  *src*: Source image
     -#  *dst*: Destination image
@@ -87,8 +202,21 @@ Explanation
     -#  *value*: If *borderType* is *BORDER_CONSTANT*, this is the value used to fill the border
         pixels.
 
--#  We display our output image in the image created previously
-    @snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp display
+#### Display the results
+
+We display our output image in the image created previously
+
+@add_toggle_cpp
+@snippet cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp display
+@end_toggle
+
+@add_toggle_java
+@snippet java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java display
+@end_toggle
+
+@add_toggle_python
+@snippet python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py display
+@end_toggle
 
 Results
 -------

doc/tutorials/imgproc/table_of_content_imgproc.markdown

@@ -87,6 +87,8 @@ In this section you will learn about the image processing (manipulation) functio
 
 -   @subpage tutorial_copyMakeBorder
 
+    *Languages:* C++, Java, Python
+
     *Compatibility:* \> OpenCV 2.0
 
     *Author:* Ana Huamán

samples/cpp/tutorial_code/ImgTrans/copyMakeBorder_demo.cpp

@@ -11,9 +11,10 @@
 using namespace cv;
 
 //![variables]
+// Declare the variables
 Mat src, dst;
 int top, bottom, left, right;
-int borderType;
+int borderType = BORDER_CONSTANT;
 const char* window_name = "copyMakeBorder Demo";
 RNG rng(12345);
 //![variables]
@@ -23,65 +24,61 @@ RNG rng(12345);
  */
 int main( int argc, char** argv )
 {
-  //![load]
-  String imageName("../data/lena.jpg"); // by default
-  if (argc > 1)
-  {
-      imageName = argv[1];
-  }
-  src = imread( imageName, IMREAD_COLOR ); // Load an image
+    //![load]
+    const char* imageName = argc >=2 ? argv[1] : "../data/lena.jpg";
 
-  if( src.empty() )
-    {
-      printf(" No data entered, please enter the path to an image file \n");
-      return -1;
-    }
-  //![load]
+    // Loads an image
+    src = imread( imageName, IMREAD_COLOR ); // Load an image
 
-  /// Brief how-to for this program
-  printf( "\n \t copyMakeBorder Demo: \n" );
-  printf( "\t -------------------- \n" );
-  printf( " ** Press 'c' to set the border to a random constant value \n");
-  printf( " ** Press 'r' to set the border to be replicated \n");
-  printf( " ** Press 'ESC' to exit the program \n");
+    // Check if image is loaded fine
+    if( src.empty()) {
+        printf(" Error opening image\n");
+        printf(" Program Arguments: [image_name -- default ../data/lena.jpg] \n");
+        return -1;
+    }
+    //![load]
 
-  //![create_window]
-  namedWindow( window_name, WINDOW_AUTOSIZE );
-  //![create_window]
+    // Brief how-to for this program
+    printf( "\n \t copyMakeBorder Demo: \n" );
+    printf( "\t -------------------- \n" );
+    printf( " ** Press 'c' to set the border to a random constant value \n");
+    printf( " ** Press 'r' to set the border to be replicated \n");
+    printf( " ** Press 'ESC' to exit the program \n");
 
-  //![init_arguments]
-  /// Initialize arguments for the filter
-  top = (int) (0.05*src.rows); bottom = (int) (0.05*src.rows);
-  left = (int) (0.05*src.cols); right = (int) (0.05*src.cols);
-  //![init_arguments]
+    //![create_window]
+    namedWindow( window_name, WINDOW_AUTOSIZE );
+    //![create_window]
 
-  dst = src;
-  imshow( window_name, dst );
+    //![init_arguments]
+    // Initialize arguments for the filter
+    top = (int) (0.05*src.rows); bottom = top;
+    left = (int) (0.05*src.cols); right = left;
+    //![init_arguments]
 
-  for(;;)
-       {
-         //![check_keypress]
-         char c = (char)waitKey(500);
-         if( c == 27 )
-           { break; }
-         else if( c == 'c' )
-           { borderType = BORDER_CONSTANT; }
-         else if( c == 'r' )
-           { borderType = BORDER_REPLICATE; }
-         //![check_keypress]
+    for(;;)
+    {
+        //![update_value]
+        Scalar value( rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255) );
+        //![update_value]
 
-         //![update_value]
-         Scalar value( rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255) );
-         //![update_value]
+        //![copymakeborder]
+        copyMakeBorder( src, dst, top, bottom, left, right, borderType, value );
+        //![copymakeborder]
 
-         //![copymakeborder]
-         copyMakeBorder( src, dst, top, bottom, left, right, borderType, value );
-         //![copymakeborder]
+        //![display]
+        imshow( window_name, dst );
+        //![display]
 
-         //![display]
-         imshow( window_name, dst );
-         //![display]
-       }
+        //![check_keypress]
+        char c = (char)waitKey(500);
+        if( c == 27 )
+        { break; }
+        else if( c == 'c' )
+        { borderType = BORDER_CONSTANT; }
+        else if( c == 'r' )
+        { borderType = BORDER_REPLICATE; }
+        //![check_keypress]
+    }
 
-  return 0;
+    return 0;
 }

samples/java/tutorial_code/ImgTrans/MakeBorder/CopyMakeBorder.java

+/**
+ * @file CopyMakeBorder.java
+ * @brief Sample code that shows the functionality of copyMakeBorder
+ */
+
+import org.opencv.core.*;
+import org.opencv.highgui.HighGui;
+import org.opencv.imgcodecs.Imgcodecs;
+
+import java.util.Random;
+
+class CopyMakeBorderRun {
+
+    public void run(String[] args) {
+
+        //! [variables]
+        // Declare the variables
+        Mat src, dst = new Mat();
+        int top, bottom, left, right;
+        int borderType = Core.BORDER_CONSTANT;
+        String window_name = "copyMakeBorder Demo";
+        Random rng;
+        //! [variables]
+
+        //! [load]
+        String imageName = ((args.length > 0) ? args[0] : "../data/lena.jpg");
+
+        // Load an image
+        src = Imgcodecs.imread(imageName, Imgcodecs.IMREAD_COLOR);
+
+        // Check if image is loaded fine
+        if( src.empty() ) {
+            System.out.println("Error opening image!");
+            System.out.println("Program Arguments: [image_name -- default ../data/lena.jpg] \n");
+            System.exit(-1);
+        }
+        //! [load]
+
+        // Brief how-to for this program
+        System.out.println("\n" +
+                "\t copyMakeBorder Demo: \n" +
+                "\t -------------------- \n" +
+                " ** Press 'c' to set the border to a random constant value \n" +
+                " ** Press 'r' to set the border to be replicated \n" +
+                " ** Press 'ESC' to exit the program \n");
+
+        //![create_window]
+        HighGui.namedWindow( window_name, HighGui.WINDOW_AUTOSIZE );
+        //![create_window]
+
+        //! [init_arguments]
+        // Initialize arguments for the filter
+        top = (int) (0.05*src.rows()); bottom = top;
+        left = (int) (0.05*src.cols()); right = left;
+        //! [init_arguments]
+
+        while( true ) {
+            //! [update_value]
+            rng = new Random();
+            Scalar value = new Scalar( rng.nextInt(256),
+                    rng.nextInt(256), rng.nextInt(256) );
+            //! [update_value]
+
+            //! [copymakeborder]
+            Core.copyMakeBorder( src, dst, top, bottom, left, right, borderType, value);
+            //! [copymakeborder]
+            //! [display]
+            HighGui.imshow( window_name, dst );
+            //! [display]
+
+            //![check_keypress]
+            char c = (char) HighGui.waitKey(500);
+            c = Character.toLowerCase(c);
+
+            if( c == 27 )
+            { break; }
+            else if( c == 'c' )
+            { borderType = Core.BORDER_CONSTANT;}
+            else if( c == 'r' )
+            { borderType = Core.BORDER_REPLICATE;}
+            //![check_keypress]
+        }
+
+        System.exit(0);
+    }
+}
+
+public class CopyMakeBorder {
+    public static void main(String[] args) {
+        // Load the native library.
+        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
+        new CopyMakeBorderRun().run(args);
+    }
+}

samples/python/tutorial_code/ImgTrans/MakeBorder/copy_make_border.py

+"""
+@file copy_make_border.py
+@brief Sample code that shows the functionality of copyMakeBorder
+"""
+import sys
+from random import randint
+import cv2
+
+
+def main(argv):
+    ## [variables]
+    # First we declare the variables we are going to use
+    borderType = cv2.BORDER_CONSTANT
+    window_name = "copyMakeBorder Demo"
+    ## [variables]
+    ## [load]
+    imageName = argv[0] if len(argv) > 0 else "../data/lena.jpg"
+
+    # Loads an image
+    src = cv2.imread(imageName, cv2.IMREAD_COLOR)
+
+    # Check if image is loaded fine
+    if src is None:
+        print ('Error opening image!')
+        print ('Usage: copy_make_border.py [image_name -- default ../data/lena.jpg] \n')
+        return -1
+    ## [load]
+    # Brief how-to for this program
+    print ('\n'
+           '\t 	 copyMakeBorder Demo: \n'
+           '	 -------------------- \n'
+           ' ** Press \'c\' to set the border to a random constant value \n'
+           ' ** Press \'r\' to set the border to be replicated \n'
+           ' ** Press \'ESC\' to exit the program ')
+    ## [create_window]
+    cv2.namedWindow(window_name, cv2.WINDOW_AUTOSIZE)
+    ## [create_window]
+    ## [init_arguments]
+    # Initialize arguments for the filter
+    top = int(0.05 * src.shape[0])  # shape[0] = rows
+    bottom = top
+    left = int(0.05 * src.shape[1])  # shape[1] = cols
+    right = left
+    ## [init_arguments]
+    while 1:
+        ## [update_value]
+        value = [randint(0, 255), randint(0, 255), randint(0, 255)]
+        ## [update_value]
+        ## [copymakeborder]
+        dst = cv2.copyMakeBorder(src, top, bottom, left, right, borderType, None, value)
+        ## [copymakeborder]
+        ## [display]
+        cv2.imshow(window_name, dst)
+        ## [display]
+        ## [check_keypress]
+        c = cv2.waitKey(500)
+
+        if c == 27:
+            break
+        elif c == 99: # 99 = ord('c')
+            borderType = cv2.BORDER_CONSTANT
+        elif c == 114: # 114 = ord('r')
+            borderType = cv2.BORDER_REPLICATE
+        ## [check_keypress]
+    return 0
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:])