Autodesk 00126-050008-1630A User Guide - Page 65

WiseImage - User's Guide Mean error indicates the average error of the method chosen. Also, pay attention to the Xerr and Yerr values to estimate the error of the chosen method for every point. Example of an Image Calibration This example shows the calibration of a color image from the UTRECHT.TIF file of the SAMPLES subfolder of the program root folder. Image loading Choose Open from the rFile menu. In the dialog box go to the SAMPLES folder and double-click the UTRECHT.TIF file name. - or - Select the UTRECHT.TIF file and press the Open button in the dialog box. Note that this image sample has raster grid with a X-axis of 2 cells and an Y-axis of 2 cells. The size of cells in this grid is known to be 32x32 mm, and in the original scanned image the grid cells are distorted. We assume that the whole image distortion corresponds to the grid distortion. Use calibration procedure to eliminate distortion. Open the Calibration dialog box From the rImage menu, choose Calibration or click the button on the WiseImage toolbar. Creating a set of calibration pairs using calibration grid 1. Press the button in the Calibration dialog box. The Calibration Grid dialog box appears. 2. Zoom to the image lower-left corner. 3. Enter the exact coordinates of the lower-left grid node to Origin the UCS is defined or press the Measure button and click a point at the raster lower- left grid node, as shown in the figure below. 66