JITTER CHART

PURPOSE:To measure distances between lines in a copy figure by specifying the pattern of a jitter chart. CONSTITUTION:There are N arrays of lines which have constant length and width which are arranged at equal intervals L of interline distance at right angles (laterally) to the lengthwise direction of the lines in the lengthwise direction (laterally) of the lines. The N arrays of lines are 1st, 2nd, ..., and (N)th arrays from above. Assuming that (i) is an integer more than two and less than N, the (i)th line shifts from the (j)th array laterally by distance L/N and from the (j)th line to right by the (i-1)th array. When this pattern is copied, no line overlaps with each other even if a copy image is expanded or reduced locally owing to the generation of jitters because the L is made sufficiently large, so the interline distance is measured to measure the local expansion or contraction of the copy image.