Edge Detectors

Which one is robust to detect weak edges while going unresponsive to noise? Sobel or Canny edge detectors?

Answer 1

[Naz]

I would recommend you to try out all and see which one works better in your case. I had to do it once and I applied edge enhancement algorithms before using edge detection. In the following paper http://staff.science.uva.nl/~rein/nldiffusionweb/ named nldiffusioncode.pdf you can read about three algorithms they developed. The code is free and the link is matlab.zip. I could not find the actual webpage.

I also used adapthisteq function from matlab to enhance contrast before before edge enhancement and detection

Answer 2

[Sean de Wolski]

Perhaps you could try testing and comparing them for your application:

doc edge

Answer 3

[David Young]

Canny.

[Saad Abdullah]

yeah i was also thinking about Canny, but I did not know whether it is unresponsive to noise or not. It is because when i set threshold value to 0.02, it shows more noise than sobel.