AUTOMATED METHOD AND APPARATUS FOR VISION REGISTRATION OF GRAPHICS AREAS OPERATING FROM THE UNPRINTED SIDE

摘要

A method and apparatus (10) are disclosed for performing finishing operations on at least one graphics area (50) on a graphics sheet (40), the graphics sheet having a graphics side, an opposite process side, and reference features (e.g. corners A-D), the graphics side bearing the graphics area(s) and registration marks (52A, 52B, etc.) in predetermined positions with respect to the graphics area(s). The method comprises positioning the graphics sheet on a sheet-receiving surface (2), sensing from the graphics side the positions of the registration marks, determining the coordinates of the graphics area(s) with respect to the sheet-receiving surface as if viewable from the process side, and performing finishing operations on the process side of the graphics sheet based on such determination, whereby such process-side finishing operations compensate for variations of the graphics area(s).