say that there should be an edge in the corresponding region. Similarly, if the intensity differences between the adjacent neighboring pixels were higher, one could argue that more than one edge should be considered to exist, or even none at all.

Approaches

There are many methods for edge detection, but most of them can be grouped into two categories, search-based and zero-crossing based.The search-based methods detect edges by first computing a measure of edge strength, usually a first-order derivative expression

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