Thematic processing and retrieving of watermarks
В. Н. Карнаухов, Emanuel Wenger, Nikolay S. Merzlyakov, Alois Haidinger, F. Lackner · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1995
This paper presents an application of digital image processing in the historical sciences. it deals with the processing of x-ray recordings of watermark images taken from Middle Ages codices. A sequence of processing steps for image enhancement, geometrical transformations, watermark extraction,a nd binarization is suggested. The watermarks are stored together with alphanumeric information in a database, allowing the historian to retrieve and compare watermarks and to measure parameters of watermarks such as height, length, distance between special points, and radii.