PERIODIC IMAGE PATTERN AND SHEET FOR DOT MANAGEMENT USING THE SAME AS WELL AS METHOD FOR MANAGEMENT OF DOT IMAGE

摘要

PROBLEM TO BE SOLVED: To provide periodic image patterns which can obtain dot information with the work of one operation alone or the simple work involving mere viewing of the result of output with good accuracy without requiring a cost and a sheet for dot management using the same as well as a management method for the dot images. SOLUTION: The periodic image patterns which are the periodic image patterns capable of obtaining the dot information by the interference fringe patterns generated when superposed on the dot images and are characterized in that the intervals of the periods at an arbitrary one point on the images and the directions forming the periods vary continuously from near this arbitrary one point and that the directions formed by these periods consist of an angle of at least >=30 deg.. The sheet for dot management using the periodic image patterns and further the management method for the dot images are given.