Autodesk 00126-050008-1640A User Guide - Page 62

5 Calibrating Raster Images Resetting Calibration Pairs This operation resets the measured coordinates of the selected calibration pairs to appropriate real ones. Note that this action can't be undone. To reset calibration pairs: 1. Select the required pairs from the list in the Calibration dialog box. 2. From the cursor menu, choose Reset or click the dialog box. button in the Calibration Choosing Calibration Method The choice of calibration method is based on the nature of image distortion and the quantity and location of calibration pairs. If the type of image distortion is unknown, then choose a calibration method automatically. In this case the program automatically chooses the optimal calibration method for the set of calibration pairs. The following table describes possible distortions and calibration methods, used to correct them. 63