Archival and retrieval of historical watermark images

Rauber, Christian; Tschudin, Peter F.; Startchik, Sergei; Pun, Thierry

doi:10.1109/icip.1996.561016

Cited by 11 publications

(7 citation statements)

References 9 publications

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“…Even today, although new methods are available huge quantities of watermarks are still collected manually and arranged in albums in the highest quality for digital presentations (Sosower 2004, Rückert 2003. Digitally stored watermarks also require archiving and retrieval techniques based on their appearance and shape (Riley 2002, Rauber 1996. These examples show that watermark research is still going on and of great interest to scientists in quite different fields.…”

Section: Introductionmentioning

confidence: 98%

Advantages and Disadvantages of Various Techniques for the Visualization of Watermarks

Meinlschmidt¹,

Märgner²

2009

Restaurator

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This paper discusses the technical difficulties which may be encountered in the visualization indispensable in the localization and dating of papers and the investigation of watermarks. Modern digital techniques for visualizing obscured watermarks in historical documents are discussed. The advantages and disadvantages of the various digital methods will be presented and special attention will be devoted to the discriminating between writings and drawings and the underlying watermarks. As a new diagnostic method the use of heat radiation in the medium and long infrared spectrum is suggested: this creates an image of heat transmission in the medium due to the different densities and thickness variations in the paper. This type of recording is ecological, conservational and presents no health risks to the persons concerned. It can also be documented and communicated for any purpose with little expenditure of time and at high resolution.

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Section: Introductionmentioning

confidence: 98%

Advantages and Disadvantages of Various Techniques for the Visualization of Watermarks

Meinlschmidt¹,

Märgner²

2009

Restaurator

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“…The extraction of watermarks on old hand-written documents is described in [2]. Finally, the management of a multimedia database of historical papers representing ancient watermarks is detailed in [3].…”

Section: Introductionmentioning

confidence: 99%

Real-time Registration of Paper Watermarks

2001

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T he aim of this article is to outline the issues involved in the application of machine vision to the automatic extraction and registration of watermarks from continuous web paper. The correct identification and localization of watermarks are key issues in paper manufacturing. As well as requiring the position of the watermark for defect detection and classification, it is necessary to insure its position on the paper prior to the cutting process. Two paper types are discussed, with and without laid and chain lines (these lines appear as a complex periodic background to the watermark and further complicate the segmentation process). We will examine both morphological and Fourier approaches to the watermark segmentation process, concentrating specifically on those images with complex backgrounds. Finally we detail a system design suitable for real-time implementation.

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“…Le second projet dénommé KRYPICT [11,12] s'intéresse à tout le côté informatique du projet. Cela concerne tout aussi bien les capacités de stockage des informations, le type d'accès aux données, la diffusion des documents, ainsi que les moyens de retrouver un document de manière rapide et efficace.…”

Section: Introductionunclassified