SYSTEM FOR EVALUATING LIGHT PEN STRIKES

摘要

Data processing apparatus and methods for identifying a point on a continuous displayed image are described. In the case of a continuous vector, an iterative sequence of pairs of decreasingly smaller vectors are generated and evaluated to detect the location of a light pen strike on the continuous vector. In particular, when a vector in the iterative sequence is detected which is found to have sufficiently small magnitude, the process is terminated and one end of that vector is considered to be the desired point.