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Apparatus for Optical Comparison Between Two Surfaces

IP.com Disclosure Number: IPCOM000185693D
Original Publication Date: 2009-Jul-31
Included in the Prior Art Database: 2009-Jul-31
Document File: 3 page(s) / 334K

Publishing Venue

IBM

Abstract

This invention removes the optical illusions created by edge effects & picture framing (non-uniform appearance near the edges) when comparing a master chip to an actual part.