Special commands in SAMT

This menu contains commands that could not fit another menu item. It contains:

1. Picture routines: Sobel, Edge, Laplace
2. Rotate
3. Point edit
4. Point Functions
5. Watershed and Flood fill
6. Structure

Picture routines: Sobel, Edge, Laplace

The most common edge operator is the so called "Sobel" operator. It is a discrete approximation of the first derivation. It uses two cores:

-1 0 1
-2 0 2 Sy
-1 0 1

and

1 2 1
0 0 0 Sx
-1 -2 -1

To calculate the result:

A=(Sx*I)^2+(Sy*I)^2

with I as the input picture. The Sobel operator is useful to detect edges in a map. A variant of the Sobel operator is the edge operator. It can be used alternatively to the Sobel operator.
The Laplace operator aproximates a second order derivation. It is used to emphasize the structure of an input picture.

Rotate

The routine "Rotate" rotates a map with an angle 90 degrees,180 degrees or 270 degrees.

Point edit

The point function is simple to use. Often it is useful to manipulate a point in map. To do that, please fill the new value in P1 and click with mouse to the point (or click to the start point). With the menu entry "Set Point" the operation will be completed.
The commands "Point_Create" and "Point_Edit" allows to open and edit a point theme.