After you specify control points, you must save them in the workspace to make them
available for the next step in image registration, processing by
To save control points to the workspace, select File on the Control Point Selection Tool menu bar, then choose the Export Points to Workspace option. The Control Point Selection Tool displays this dialog box:
By default, the Control Point Selection Tool saves the coordinates of valid control
points. The Control Point Selection Tool does not include unmatched and predicted points in
fixedPoints arrays. The arrays are
n-by-2 arrays, where n is the number of valid
control point pairs you selected. The two columns represent the x- and
y-coordinates of the control points, respectively, in the intrinsic
coordinate system of the image.
This example shows the
movingPoints array containing four valid pairs
of control points.
movingPoints = 215.6667 262.3333 225.7778 311.3333 156.5556 340.1111 270.8889 368.8889
To save the current state of the Control Point Selection Tool, including unpaired and predicted control points, select the Structure with all points check box.
This option saves the positions of all control points and their current state in a
cpstruct = inputPoints: [4x2 double] basePoints: [4x2 double] inputBasePairs: [4x2 double] ids: [4x1 double] inputIdPairs: [4x2 double] baseIdPairs: [4x2 double] isInputPredicted: [4x1 double] isBasePredicted: [4x1 double]
You can use the
cpstruct to restart a control point selection session
at the point where you left off. This option is useful if you are picking many points over a
long time and want to preserve unmatched and predicted points when you resume work.
To extract the arrays of valid control point coordinates from a
cpstruct, use the
The Control Point Selection Tool also asks if you want to save your control points when you exit the tool.