There has been an abundance of work on different approaches to the
detection of one dimensional features in images. The wide interest is
due to the large number of vision applications which use
edges and lines as primitives, to achieve
higher level goals. This section describes some of the approaches
taken in the past. For other reviews of edge finding, see
[3], [20], [78] and
[48]. An attempt has been made to group the edge
detectors into several different types.