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Fig. 329: Edge detection with „Number search rays“ >> 1. The first edge perpendicular to the search
direction is found.
Function of Sigma (smoothing) to sharp or blurred edges
The edge strength represents the assumption of edge steps over a certain area in search direction, which
is quantified in „Sigma“ (smoothing). With sharp edges the edge strength is not increased with increasing
sigma. But with blurred edges the edge strength is increased by increasing sigma value.
Fig. 330: Edge detection of sharp edge. High edge strength with low sigma value (smoothing).
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