Edge Detection Implementation

When I was looking for examples of canny edge detection implementations in Java, I found code developed by Tom Gibara:

http://www.tomgibara.com/computer-vision/canny-edge-detector

This implementation takes an image RGB, grayscale and performs a canny edge detection and returns a buffered image.

The useful code to perform the canny was extracted and implemented with the image produced from the background removal.  The output can then be compared with the result obtained from Matlab.