DELFT UNIVERSITY OF TECHNOLOGY

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• DELFT UNIVERSITY OF TECHNOLOGY
• Jan C.A. van der Lubbe

Bernstein Meeting, Stuttgart, July 1-2, 2008
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The TUD-Bernstein Team

• Hector Moreu Otal
• Behnaz Pourebrahimi
• Mark van Staalduinen
• Jan C.A. van der Lubbe

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DUT Image Processing TasksVienna, January 17,
2008

• Sieve Feature Measurements in Binary Images
• Sieve Feature Measurements in Grayscale Images
• Sieve Feature Segmentation in Grayscale Images
• Watermark Imaging by Backlight Subtraction
• Identical Watermarks Identification

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Sieve Feature Measurements in Binary Images 1

• Software to isolate watermarks from the Piccard
  Online database and the printed Piccard
  collection

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Sieve Feature Measurements in Binary Images 2

• Automatic Isolations
• Performance Piccard Online 80
• Performance Printed Piccard 85
• Check by Expert

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Sieve Feature Measurements in Binary Images 3
Manual isolation of a watermark from Piccard
Online
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Sieve Feature Measurements in Binary Images 4
Manual isolation of a watermark from printed
Piccard
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Sieve Feature Measurements in Binary Images 5
The isolation of watermarks from both collections
is currently being carried out Images will be
used to automatically measure watermarks height
and width. They will also be used to identify
identical watermarks within both collections.
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Identical Watermarks Identification 1Printed
Piccard vs. Piccard Online
Summation for every box
Compute vector
Compute Euclidean distance with the vectors of
the database
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Identical Watermarks Identification 2
Output the first seven most similar watermarks
to the query. Check by Expert Performance
90. In the 62 of the cases the identical
watermark occupies the first place.
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Identical Watermarks Identification 3
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Sieve Feature Segmentation and Measurements in
Grayscale Images 1
Software to segment chain and laid lines from
X-ray and backlight images. Measurements laid
lines density, chain lines distances Identify
identical pieces of paper based on chain and laid
lines information. Demo version at
http//rembrandt.ewi.tudelft.nl/
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Sieve Feature Segmentation and Measurements in
Grayscale Images 2
Software to extract watermarks automatically
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Watermark Imaging by Backlight Subtraction 1
Software for subtraction of back- and frontlight
imagery.
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Watermark Imaging by Backlight Subtraction 2
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Publications

• Rembrandt for Dummies, Addison Wesley, 2007, p.
  242-243.
• Watermark detection in X-Ray Images from Paper
  for Dating Artworks, 5th IASTED Inf. Conf. on
  Signal Processing, Pattern Recognition, and
  Application, Innsbruck, Feb. 13-15, 2008 (Moreu
  Otal, vStaalduinen, Paclik, vdLubbe)
• Dutch Paper Making, Bernstein Catalogue (vdLubbe)
• Digital Watermark Detection and Retrieval,
  Bernstein Catalogue (vdLubbe, Moreu Otal)
• Image Enhancement in Noisy Watermark Images for
  Watermark Retrieval, EVA, Berlin, Nov. 12-14,
  2008 (Pourebrahimi, Moreu Otal, vdLubbe)
• Moreu Otal Isolation and Identification of
  Identical Watermarks within Large Databases, EVA,
  Berlin, Nov. 12-14, 2008 (Moreu Otal, vdLubbe)
• Content-based Paper Retrieval Towards the
  Reconstruction of Art History, PhD Thesis, DUT,
  2008 (vStaalduinen)

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Future Work

• Improvement of Automatic Watermark Detection in
  Binary Images
• Semi-automatic Watermark Detection in Grayscale
  Images
• Advanced Matching Techniques
• Watermark Scissors for Briquet?

The oldest picture of a Dutch paper mill. The
paper mill of Schiedam on a map by Jacques de
Gheyn, 1598.