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

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Presentation transcript:

DELFT UNIVERSITY OF TECHNOLOGY Jan C.A. van der Lubbe Bernstein Meeting, Stuttgart, July 1-2, 2008 16 November, 2018

The TUD-Bernstein Team Hector Moreu Otal Behnaz Pourebrahimi Mark van Staalduinen Jan C.A. van der Lubbe 16 November, 2018

DUT Image Processing Tasks Vienna, 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 16 November, 2018

Sieve Feature Measurements in Binary Images 1 Software to isolate watermarks from the Piccard Online database and the printed Piccard collection 16 November, 2018

Sieve Feature Measurements in Binary Images 2 Automatic Isolations Performance Piccard Online: 80 % Performance Printed Piccard: 85 % Check by Expert 16 November, 2018

Sieve Feature Measurements in Binary Images 3 Manual isolation of a watermark from Piccard Online 16 November, 2018

Sieve Feature Measurements in Binary Images 4 Manual isolation of a watermark from printed Piccard 16 November, 2018

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. 16 November, 2018

Identical Watermarks Identification 1 Printed Piccard vs Identical Watermarks Identification 1 Printed Piccard vs. Piccard Online Summation for every box Compute vector Compute Euclidean distance with the vectors of the database 16 November, 2018

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. 16 November, 2018

Identical Watermarks Identification 3 16 November, 2018

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/ 16 November, 2018

Sieve Feature Segmentation and Measurements in Grayscale Images 2 Software to extract watermarks automatically 16 November, 2018

Watermark Imaging by Backlight Subtraction 1 Software for subtraction of back- and frontlight imagery. 16 November, 2018

Watermark Imaging by Backlight Subtraction 2 16 November, 2018

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) 16 November, 2018

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. 16 November, 2018