Automatic seal verification using three-dimensional reference seals

The most important problem on automatic seal impression verification is to absorb the various impression quality depending on the various affixing conditions. Over the past years, many studies have been made on absorbing the various impression quality using a two-dimensional image as reference and input. But it is difficult to verify each of a large number of input patterns by a sole two-dimensional reference pattern. This paper proposes a seal identification method using a three-dimensional image (range image) as reference. As results of the verification with actual seal impressions, the verification rate is improved from that by using two-dimensional reference impressions