Measurement of Stamped Characters using Range Image and its Effectiveness

Abstract

In order to recognize stamped characters, conventional methods measure them as binarized gray-level image using camera. Then, it is difficult to get exact image of stamped characters, because gray-level noise is generated on the image by uneveness of stamped surface. This paper presents a new approach to measure stamped characters as range image using range finder system for the recognition system. We analyze the characteristics by comparing gray-level image with range image, and discuss the effectiveness using actual sample data.