What's Logic Behind the Construction of Sobel's Filter in Image Processing?

1. How does the Sobel filter work?
2. What is Sobel in image processing?
3. What does Sobel do?
4. What is the advantage of using Sobel operator?

How does the Sobel filter work?

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 is Sobel in image processing?

The Sobel method, or Sobel filter, is a gradient-based method that looks for strong changes in the first derivative of an image. The Sobel edge detector uses a pair of 3 × 3 convolution masks, one estimating the gradient in the x-direction and the other in the y-direction.

What does Sobel do?

The Sobel operator performs a 2-D spatial gradient measurement on an image and so emphasizes regions of high spatial frequency that correspond to edges. Typically it is used to find the approximate absolute gradient magnitude at each point in an input grayscale image.

What is the advantage of using Sobel operator?

The primary advantages of the Sobel operator lie in its simplicity. The Sobel method provides a approximation to the gradient magnitude. Another advantage of the Sobel operator is it can detect edges and their orientations.