Patent ID: 7388687
Filing Date: 2008-06-17
Classification: G06T,H04N

Abstract:
1. A method of evaluating an image pattern output accuracy, comprising: a command signal setting step of setting command signals which respectively provide different distances from a reference point to at least three other points; an image pattern output step of outputting an image pattern which indicates reference coordinates of the reference point and distant measurement coordinates of said at least three points; an image pattern reading step of optically reading the image pattern; a coordinate data obtaining step of obtaining data of the reference coordinates and the distant measurement coordinates from the image pattern read in the image pattern reading step; a distance calculating step of calculating each distance between the reference coordinates obtained in the coordinate data obtaining step and the distance measurement coordinates obtained in the coordinate data obtaining step, and outputting output signals which respectively provide the calculated distances; and an S/N ratio and sensitivity calculating step of calculating based on the command signals and the output signals, at least one of an S/N ratio, which indicates a degree of dispersion of the output signals with respect to the command signals, and a sensitivity of the output signals with respect to the command signals, based on a variation and errors in the output signals, and linearity between the command signals and the output signals, by using a quality engineering method.