To specify control points in a pair of images interactively, use the Control Point
cpselect. The tool displays the image you want
to register, called the moving image, next to the reference image, called
the fixed image.
Specifying control points is a four-step process:
Start the tool, specifying the moving image and the fixed image.
Use navigation aids to explore the
image, looking for visual elements that you can identify in both images.
cpselect provides many ways to navigate around the image. You can pan
and zoom to view areas of the image in more detail.
Specify matching control point pairs in the moving image and the fixed image.
Save the control points in the workspace.
The following figure shows the default appearance of the tool when you first start it.