Patent Document ID: 4601581
Application ID: 06719730
Patent Status: 1

Claim One:
1. A method of determining the true edge length of a body subtended by two other body edges, comprising: (a) exposing the body to a beam of light such that the edge is imaged by an optical system for projecting a linear section across said body as a focused silhouette-like image onto an array of photosensitive elements; (b) moving said array to scan at least a portion of said edge to provide a data point of a predetermined minimum intensity level sensed by each of a respective plurality of said elements; (c) determining a first line from said data points representing the location of said true edge; (d) moving said array to scan said other body edges to provide a second and third plurality of data points of a predetermined intensity level; (e) determining a second line and third line, respectively, from said second and third plurality of data points representing at least a portion of said other body edges; and (f) extending said second and third lines to intersect said first line, the distance between said intersection points representing the true length of said body edge.