This method detects edges or regions in an image. In contrast to Valleys and Canny, here a Laplace filter is calculated, followed by smoothing using a Gauss filter, and the edges (Display Mode >Edges) or regions (Display Mode > Regions) are detected.

Parameter

Description

Sigma

Sets the degree of smoothing of input image before detection of edges or regions. A Gauss filter is used as a smoothing function. The smoothing factor can be used to influence the sensitivity of recognition. If a low value is set, lots of edges are detected. Fewer edges are detected with a high value. If the value 0 is set, no smoothing is performed.

Display Mode

-

Edges

Region edges are detected.

-

Regions

The regions, not just their edges, are detected.