ACCURACY TESTING METHODS FOR DIGITIZER AND PLOTTER

摘要

PURPOSE: To easily test the accuracy of a digitizer and a plotter by obtaining displacement between the coordinates of reference points on a reference drawing and the digitizer and calculating the standard error between displacements before and after applying affine transformation to the obtained displacement. ;CONSTITUTION: An operator sticks the reference drawing 5 to the digitizer 1 and inputs the coordinates of reference points A1, A2,... through the use of an indicator 7. A computer 3 determines displacement x_i and y_i from the inputted coordinates (X_i,Y_i) on the digitizer 1 and the coordinates (X°i, Y°_i)of the respective reference points on the reference drawing 5 in accordance with x_i= X_i-X°_i, y_i =Yi-y°_i calculates the correction parameter of the digitizer 1 by affine-transforming displacement x_i and Y_i and calculates the standard error between displacement before/after correction by the correction parameter. Thereby, the accuracy of the digitizer and the plotter can easily be tested.;COPYRIGHT: (C)1994,JPO