Editing Sobel operator (section)

== Example comparisons ==
Here, four different gradient operators are used to estimate the magnitude of the gradient of the test image.

{|
|[[Image:Bikesgray.jpg|thumb|200px|Grayscale test image of brick wall and bike rack]]
|[[Image:Bikesgray sobel.JPG|thumb|200px|Gradient magnitude from Sobel–Feldman operator]]
|[[Image:Bikesgray-scharr.png|thumb|200px|Gradient magnitude from Scharr operator]]
|-
|[[Image:Bikesgray roberts.JPG|thumb|200px|Gradient magnitude from [[Roberts Cross]] operator]]
|[[Image:Bikesgray prewitt.JPG|thumb|200px|Gradient magnitude from [[Prewitt operator]]]]
|}