Prewitt operator

1. How does Prewitt operator work?
2. What is the difference between Sobel and Prewitt?
3. What is Prewitt edge detector?
4. What is Sobel operator used for?

How does Prewitt operator work?

It simply works like as first order derivate and calculates the difference of pixel intensities in a edge region. As the center column is of zero so it does not include the original values of an image but rather it calculates the difference of right and left pixel values around that edge.

What is the difference between Sobel and Prewitt?

The difference between Prewitt and Sobel operator is the spectoral response. It is an appropriate way to estimate the magnitude and orientation of an edge. Prewitt approximation is applied on the derivatives of in- tensity function. Its results in edges where gradient of in- tensity function has maximum value.

What is Prewitt edge detector?

Prewitt operator is used for edge detection in an image. Prewitt operator detects both types of edges, these are: Horizontal edges or along the x-axis, Vertical Edges or along the y-axis.

What is Sobel operator used for?

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.