Horizontal edge detection filter matrix

1. How does a Sobel filter pick out horizontal edges?
2. What are the filters used for edge detection?
3. Why Canny is better than Sobel?
4. What is Sobel filter used for?

How does a Sobel filter pick out horizontal edges?

The Sobel filter is used for edge detection. It works by calculating the gradient of image intensity at each pixel within the image. It finds the direction of the largest increase from light to dark and the rate of change in that direction.

What are the filters used for edge detection?

The Canny filter is a multi-stage edge detector. It uses a filter based on the derivative of a Gaussian in order to compute the intensity of the gradients. The Gaussian reduces the effect of noise present in the image.

Why Canny is better than Sobel?

The edges marked by red color are edges detected by Sobel and the edges shown by white color are edges detected by Canny edge detector. The figure shows that the number of edges detected by Canny is much more than edges detected by Sobel means the Canny edge detector works better than Sobel edge detector.

What is Sobel filter used for?

The Sobel operator, sometimes called the Sobel–Feldman operator or Sobel filter, is used in image processing and computer vision, particularly within edge detection algorithms where it creates an image emphasising edges.