Select this option when you are calibrating a camera. See the Camera Calibration section for more detail. See New Project Wizard for information on the steps to create this type of project.
When creating a Camera Calibration project, you simply select your calibration images (see Project Wizard: Select Photos). When you press the Next button after adding your images a new project will be created and a dialog will appear. You then execute the process from the Camera Calibration Dialog.