Edge detection (also called “boundary detection”) is a fundamental problem in image processing.  The ability to accurately detect visible “edges” in an image has many applications – ranging from missile targeting to OCR to cool Photoshop effects.  In this project I’ve compiled 6 well-known edge detection algorithms (along with two of my own).

For those who have never used edge detection algorithms before, here are examples of various outputs:

Original image:

Prewitt method (horizontal):

Prewitt method (vertical):

Sobel method (horizontal):

Sobel method (vertical):

Laplacian method:

Hilite method:

Tanner’s method 1:

Tanner’s method 2: