University of Oulu

Anu Pramila, Anja Keskinarkaus, Tapio Seppänen, Increasing the capturing angle in print-cam robust watermarking, Journal of Systems and Software, Volume 135, 2018, Pages 205-215, ISSN 0164-1212,

Increasing the capturing angle in print-cam robust watermarking

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Author: Pramila, Anu1; Keskinarkaus, Anja1; Seppänen, Tapio1
Organizations: 1Physiological Signal Analysis Team, Center for Machine Vision and Signal Analysis, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2020-01-31


It is nowadays more probable that a print media is captured and shared with a mobile phone than with a scanner. The reasons for photographing the print range from intention of copying the image to simply sharing an interesting add with friends. Watermarking offers a solution for carrying side information in the images, and if the watermarking method being used is robust to the print-cam process, the information can be read with a mobile phone camera. In this paper, we present a print-cam robust watermarking method that is also implemented on a mobile phone and evaluated with user tests. Especially, the lens focusing problem when the picture is captured in a wide angle with respect to the printout is addressed. The results show that the method is highly robust to capturing the watermark without errors in angles up to 60° with processing times that are acceptable for real-life applications.

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Series: Journal of systems and software
ISSN: 0164-1212
ISSN-E: 1873-1228
ISSN-L: 0164-1212
Volume: 135
Pages: 205 - 215
DOI: 10.1016/j.jss.2017.10.029
Type of Publication: A1 Journal article – refereed
Field of Science: 113 Computer and information sciences
Copyright information: © 2017 Elsevier Inc. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license