AUTOMATIC CORRECTION METHOD FOR INPUT POSITION COORDINATES

摘要

PURPOSE:To attain the automatic correction of input position coordinates by providing switches to an input position detecting circuit to produce the coordinate signals equivalent to the inputs of original on a tablet surface and full-scale points. CONSTITUTION:A switch 5 for production of an original point position signal and a switch 6 for production of full-scale point position are turned on and off successively by control signals A and B after confirming that no input exists before a control system is set under a tablet application mode. Thus initial data 11 and 12 are fetched and the correction value is calculated from these data and stored through the control system. This corrected value is equal to a prescribed original point signal B and Xmax/Xmax. In such a way, the corrected value is stored for each of the XY orthogonal coordinates. The input position coordinate signal is actually used for processing of the picture display, etc. in the control system after the real input coordinate value is calculated from a correction formula X=(x-B).Xmax/Xmax.