73 ImageModelerTM User Guide
TIP You can also undistort your photographs with dedicated software or recreate wideangle photographs with ImageModeler using several photographs stitched together.
Advanced Specification—setting the principal point NOTE The following settings are recommended only to advanced users. Changes you make to these settings could adversely affect your calibration. 1 In the Scene Browser, from the Camera Devices folder, select a camera device. 2 Select the Advanced tab in the Property Box. 3 Choose Known, Constant or Variable from the Principal Point list. 4 Enter the X and Y coordinates of the point. NOTE Previously saved camera parameters (*.lens files) can be loaded—either from Autodesk Stitcher or from other ImageModeler projects.
Specifying the film back size The film back is the rectangular plate where the film is exposed. Still shots usually do not need any change to the default values; the film back size of a typical SLR camera is 24 × 36 mm. To specify the film back size: 1 In the Scene Browser, from the Camera Devices folder, select the camera device
you want to modify. 2 Select the Advanced tab in the Property Box. 3 In the Size fields, specify the width and height of the film back.