Add Java and Python code for the following imgproc tutorials: Finding contours in your image, Convex Hull, Creating Bounding boxes and circles for contours, Creating Bounding rotated boxes and ellipses for contours, Image Moments, Point Polygon Test.
This commit is contained in:
catree
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@@ -15,55 +15,167 @@ Theory
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Code
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----
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@add_toggle_cpp
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp)
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@include samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp
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@end_toggle
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@add_toggle_java
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java)
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@include samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java
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@end_toggle
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@add_toggle_python
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py)
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@include samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py
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@end_toggle
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Explanation
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-----------
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The main function is rather simple, as follows from the comments we do the following:
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-# Open the image, convert it into grayscale and blur it to get rid of the noise.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp setup
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-# Create a window with header "Source" and display the source file in it.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp createWindow
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-# Create a trackbar on the source_window and assign a callback function to it
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- Open the image, convert it into grayscale and blur it to get rid of the noise.
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp setup
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java setup
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py setup
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@end_toggle
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- Create a window with header "Source" and display the source file in it.
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp createWindow
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java createWindow
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py createWindow
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@end_toggle
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- Create a trackbar on the `source_window` and assign a callback function to it.
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In general callback functions are used to react to some kind of signal, in our
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case it's trackbar's state change.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp taskbar
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-# Explicit one-time call of `thresh_callback` is necessary to display
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Explicit one-time call of `thresh_callback` is necessary to display
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the "Contours" window simultaniously with the "Source" window.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp callback00
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-# Wait for user to close the windows.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp waitForIt
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp trackbar
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@end_toggle
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The callback function `thresh_callback` does all the interesting job.
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java trackbar
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py trackbar
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@end_toggle
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-# Writes to `threshold_output` the threshold of the grayscale picture (you can check out about thresholding @ref tutorial_threshold "here").
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp threshold
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-# Finds contours and saves them to the vectors `contour` and `hierarchy`.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp findContours
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-# For every found contour we now apply approximation to polygons
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with accuracy +-3 and stating that the curve must me closed.
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The callback function does all the interesting job.
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- Use @ref cv::Canny to detect edges in the images.
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp Canny
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java Canny
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py Canny
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@end_toggle
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- Finds contours and saves them to the vectors `contour` and `hierarchy`.
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp findContours
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java findContours
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py findContours
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@end_toggle
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- For every found contour we now apply approximation to polygons
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with accuracy +-3 and stating that the curve must be closed.
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After that we find a bounding rect for every polygon and save it to `boundRect`.
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At last we find a minimum enclosing circle for every polygon and
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save it to `center` and `radius` vectors.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp allthework
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp allthework
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java allthework
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py allthework
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@end_toggle
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We found everything we need, all we have to do is to draw.
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-# Create new Mat of unsigned 8-bit chars, filled with zeros.
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- Create new Mat of unsigned 8-bit chars, filled with zeros.
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It will contain all the drawings we are going to make (rects and circles).
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp zeroMat
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-# For every contour: pick a random color, draw the contour, the bounding rectangle and
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the minimal enclosing circle with it,
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp forContour
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-# Display the results: create a new window "Contours" and show everything we added to drawings on it.
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp showDrawings
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp zeroMat
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java zeroMat
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py zeroMat
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@end_toggle
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- For every contour: pick a random color, draw the contour, the bounding rectangle and
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the minimal enclosing circle with it.
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp forContour
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java forContour
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py forContour
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@end_toggle
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- Display the results: create a new window "Contours" and show everything we added to drawings on it.
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@add_toggle_cpp
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@snippet samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo1.cpp showDrawings
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@end_toggle
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@add_toggle_java
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@snippet samples/java/tutorial_code/ShapeDescriptors/bounding_rects_circles/GeneralContoursDemo1.java showDrawings
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@end_toggle
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@add_toggle_python
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@snippet samples/python/tutorial_code/ShapeDescriptors/bounding_rects_circles/generalContours_demo1.py showDrawings
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@end_toggle
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Result
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------
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+14
@@ -15,9 +15,23 @@ Theory
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Code
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----
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@add_toggle_cpp
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo2.cpp)
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@include samples/cpp/tutorial_code/ShapeDescriptors/generalContours_demo2.cpp
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@end_toggle
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@add_toggle_java
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/java/tutorial_code/ShapeDescriptors/bounding_rotated_ellipses/GeneralContoursDemo2.java)
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@include samples/java/tutorial_code/ShapeDescriptors/bounding_rotated_ellipses/GeneralContoursDemo2.java
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@end_toggle
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@add_toggle_python
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/python/tutorial_code/ShapeDescriptors/bounding_rotated_ellipses/generalContours_demo2.py)
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@include samples/python/tutorial_code/ShapeDescriptors/bounding_rotated_ellipses/generalContours_demo2.py
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@end_toggle
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Explanation
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-----------
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@@ -15,9 +15,23 @@ Theory
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Code
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----
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@add_toggle_cpp
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/cpp/tutorial_code/ShapeDescriptors/findContours_demo.cpp)
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@include samples/cpp/tutorial_code/ShapeDescriptors/findContours_demo.cpp
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@end_toggle
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@add_toggle_java
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/java/tutorial_code/ShapeDescriptors/find_contours/FindContoursDemo.java)
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@include samples/java/tutorial_code/ShapeDescriptors/find_contours/FindContoursDemo.java
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@end_toggle
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@add_toggle_python
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/python/tutorial_code/ShapeDescriptors/find_contours/findContours_demo.py)
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@include samples/python/tutorial_code/ShapeDescriptors/find_contours/findContours_demo.py
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@end_toggle
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Explanation
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-----------
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@@ -14,10 +14,23 @@ Theory
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Code
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----
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@add_toggle_cpp
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/cpp/tutorial_code/ShapeDescriptors/hull_demo.cpp)
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@include samples/cpp/tutorial_code/ShapeDescriptors/hull_demo.cpp
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@end_toggle
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@add_toggle_java
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/java/tutorial_code/ShapeDescriptors/hull/HullDemo.java)
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@include samples/java/tutorial_code/ShapeDescriptors/hull/HullDemo.java
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@end_toggle
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@add_toggle_python
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/python/tutorial_code/ShapeDescriptors/hull/hull_demo.py)
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@include samples/python/tutorial_code/ShapeDescriptors/hull/hull_demo.py
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@end_toggle
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Explanation
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-----------
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@@ -16,9 +16,23 @@ Theory
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Code
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----
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@add_toggle_cpp
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/cpp/tutorial_code/ShapeDescriptors/moments_demo.cpp)
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@include samples/cpp/tutorial_code/ShapeDescriptors/moments_demo.cpp
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@end_toggle
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@add_toggle_java
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/java/tutorial_code/ShapeDescriptors/moments/MomentsDemo.java)
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@include samples/java/tutorial_code/ShapeDescriptors/moments/MomentsDemo.java
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@end_toggle
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@add_toggle_python
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/python/tutorial_code/ShapeDescriptors/moments/moments_demo.py)
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@include samples/python/tutorial_code/ShapeDescriptors/moments/moments_demo.py
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@end_toggle
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Explanation
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-----------
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@@ -14,9 +14,23 @@ Theory
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Code
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----
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@add_toggle_cpp
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/cpp/tutorial_code/ShapeDescriptors/pointPolygonTest_demo.cpp)
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@include samples/cpp/tutorial_code/ShapeDescriptors/pointPolygonTest_demo.cpp
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@end_toggle
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@add_toggle_java
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/java/tutorial_code/ShapeDescriptors/point_polygon_test/PointPolygonTestDemo.java)
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@include samples/java/tutorial_code/ShapeDescriptors/point_polygon_test/PointPolygonTestDemo.java
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@end_toggle
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@add_toggle_python
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This tutorial code's is shown lines below. You can also download it from
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[here](https://github.com/opencv/opencv/tree/3.4/samples/python/tutorial_code/ShapeDescriptors/point_polygon_test/pointPolygonTest_demo.py)
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@include samples/python/tutorial_code/ShapeDescriptors/point_polygon_test/pointPolygonTest_demo.py
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@end_toggle
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Explanation
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-----------
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@@ -225,6 +225,8 @@ In this section you will learn about the image processing (manipulation) functio
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- @subpage tutorial_find_contours
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*Languages:* C++, Java, Python
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*Compatibility:* \> OpenCV 2.0
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*Author:* Ana Huamán
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@@ -233,6 +235,8 @@ In this section you will learn about the image processing (manipulation) functio
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- @subpage tutorial_hull
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*Languages:* C++, Java, Python
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*Compatibility:* \> OpenCV 2.0
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*Author:* Ana Huamán
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@@ -241,6 +245,8 @@ In this section you will learn about the image processing (manipulation) functio
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- @subpage tutorial_bounding_rects_circles
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*Languages:* C++, Java, Python
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*Compatibility:* \> OpenCV 2.0
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*Author:* Ana Huamán
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@@ -249,6 +255,8 @@ In this section you will learn about the image processing (manipulation) functio
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- @subpage tutorial_bounding_rotated_ellipses
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*Languages:* C++, Java, Python
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*Compatibility:* \> OpenCV 2.0
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*Author:* Ana Huamán
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@@ -257,6 +265,8 @@ In this section you will learn about the image processing (manipulation) functio
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- @subpage tutorial_moments
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*Languages:* C++, Java, Python
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*Compatibility:* \> OpenCV 2.0
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*Author:* Ana Huamán
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@@ -265,6 +275,8 @@ In this section you will learn about the image processing (manipulation) functio
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- @subpage tutorial_point_polygon_test
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*Languages:* C++, Java, Python
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*Compatibility:* \> OpenCV 2.0
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*Author:* Ana Huamán
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