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Image-Processing/Canny Edge Detection/Readme.md

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+# Canny Edge detection using OpenCV and python
+
+## What is Canny Edge Detection?
+
+Canny Edge Detection
+It is an edge detection operator that uses a multi-stage algorithm to detect a wide range of edges in images.
+It was developed by John F. Canny ,an Australian computer scientist, back in 1986.
+
+### _The Canny edge detection algorithm is composed of 5 steps_:
++ Noise reduction;
++ Gradient calculation;
++ Non-maximum suppression;
++ Double threshold;
++ Edge Tracking by Hysteresis.
+
+## Lets see how it's done.
+
+1. #### Input image:  
+    Input in RGB format.  
+
+2. #### Converting the image to grayscale:
+   For easier calculations.  
+
+3. #### Smoothing the image:  
+   Smoothing of image for noise reduction. Gradient is the first order derivatives of image for each direction.
+   It is cause of edges that seems more and the edges look thick.  
+        
+4. #### Image gradient:  
+   Gradient is the function of the partial derivatives. I applied to the image convolution process with Sobel filters to obtain this partial derivative.  
+
+5. #### Non-maximum suppression:  
+   In this step the pixel is compared with its two neighbors of the pixel, if the compared pixel is larger than neighbor we do not change the pixel,
+   otherwise, this pixel is not maximum value hence, we set the zero to that pixel.
+
+6. #### Tracking the edge by hysteresis:  
+   In this step we choose two type of threshold, high and low threshold value. Afterward, each pixel of image is compared with two different threshold value.
+   If the pixel is larger than the high threshold, this pixel mark with 255 in the final image.
+   If the pixel between high threshold and low threshold. If the pixel is smaller than low-threshold image, mark as black with 0 (black) value in the resulting image.  
+   
+7. #### Final Results:  
+   After passing all of the mentioned steps, we will give the final result from the method.
+   
+# Output Results:
+
+For more detail on learning Canny Edge Detection and maths behind , see my article [here](https://medium.com/simply-dev/what-is-canny-edge-detection-cfefa272a8d0)
+
+
+