<< Click to display Table of content >> Navigation:  Geometry > Alter geometry tools > Helmert - Relocate image

This tool is avaible when an object is selected, in the group Modification | Helmert from the ribbon Geometry.

Principe

The Helmert tool allows to apply a transformation to the object, using 4 points of reference on the object and 4 projected points.

In the above example, the rectangle has been transformed using the vectors AA', BB', CC' and DD'.

Example in MithraSIG

To move an object with Helmert:

•Select the object.

•Enable the tool Helmert.

•Do a first click to define a first origin point (a vertex of an object, corner of an image...): A.

•Do a second click to define the new position of the first origin point: A'.

•Do a third click to define a second origin point (a vertex of an object, corner of an image...): B.

•Do a fourth click to define the new position of the second origin point: B'.

•Redo the same for the 2 other points C and D.