Patent ID: 6434444
Filing Date: 2002-08-13
Classification: B26D,B26F,G05B

Abstract:
A method of calculating an estimated position of a third occurrence of a pattern characteristic on a patterned sheet material having repeating occurrences of the pattern characteristic, comprising:(a) projecting a first reference image onto the sheet material at a first estimated position of the pattern characteristic; (b) visually inspecting the sheet material and the projected first reference image to identify a corresponding first pattern characteristic position; (c) identifying a difference between the first reference image on the sheet material at the first estimated position and the corresponding first pattern characteristic position; (d) projecting a second reference image onto the sheet material, the second reference image including a second estimated position of the pattern characteristic; (e) visually inspecting the sheet material and the projected second reference image to identify a corresponding second actual pattern characteristic position; (f) identifying a difference between the second reference image on the sheet material at the second estimated position and the corresponding second pattern characteristic position; and (g) calculating a position of a third occurrence of the pattern characteristic based upon a difference between the first estimated position and the first actual pattern characteristic position, and the second estimated position and the second actual pattern characteristic position.