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Edges may be ''viewpoint dependent'' - these are edges that may change as the viewpoint changes, and typically reflect the geometry of the scene, objects occluding one another and so on, or may be ''viewpoint independent'' - these generally reflect properties of the viewed objects such as markings and surface shape. In two dimensions, and higher, the concept of a [[projection]] has to be considered.
A typical edge might be (for instance) the border between a block of red color and a block of yellow; in contrast a '''line''' can be a small number of pixels of a different color on an otherwise unchanging background. There will be one edge on each side of the line.Edges play quite important role in all applications of image processing
== Detecting an edge ==
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