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Update canny_detector.markdown (#8684)

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vskarlsruhe 2017-05-03 14:46:34 +02:00 committed by Vadim Pisarevsky
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commit 986d57c7b2
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doc/tutorials/imgproc/imgtrans/canny_detector/canny_detector.markdown
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@ -68,7 +68,7 @@ Code
-# **What does this program do?** -# **What does this program do?**
- Asks the user to enter a numerical value to set the lower threshold for our *Canny Edge - Asks the user to enter a numerical value to set the lower threshold for our *Canny Edge
Detector* (by means of a Trackbar) Detector* (by means of a Trackbar).
- Applies the *Canny Detector* and generates a **mask** (bright lines representing the edges - Applies the *Canny Detector* and generates a **mask** (bright lines representing the edges
on a black background). on a black background).
- Applies the mask obtained on the original image and display it in a window. - Applies the mask obtained on the original image and display it in a window.
@ -85,19 +85,19 @@ Explanation
Note the following: Note the following:
-# We establish a ratio of lower:upper threshold of 3:1 (with the variable *ratio*) -# We establish a ratio of lower:upper threshold of 3:1 (with the variable *ratio*).
-# We set the kernel size of \f$3\f$ (for the Sobel operations to be performed internally by the -# We set the kernel size of \f$3\f$ (for the Sobel operations to be performed internally by the
Canny function) Canny function).
-# We set a maximum value for the lower Threshold of \f$100\f$. -# We set a maximum value for the lower Threshold of \f$100\f$.
-# Loads the source image: -# Loads the source image:
@snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp load @snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp load
-# Create a matrix of the same type and size of *src* (to be *dst*) -# Create a matrix of the same type and size of *src* (to be *dst*):
@snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp create_mat @snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp create_mat
-# Convert the image to grayscale (using the function @ref cv::cvtColor : -# Convert the image to grayscale (using the function @ref cv::cvtColor ):
@snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp convert_to_gray @snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp convert_to_gray
-# Create a window to display the results -# Create a window to display the results:
@snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp create_window @snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp create_window
-# Create a Trackbar for the user to enter the lower threshold for our Canny detector: -# Create a Trackbar for the user to enter the lower threshold for our Canny detector:
@snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp create_trackbar @snippet cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp create_trackbar