Increasing the capturing angle in print-cam robust watermarking
Pramila, Anu; Keskinarkaus, Anja; Seppänen, Tapio (2018-01-31)
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, https://doi.org/10.1016/j.jss.2017.10.029
© 2017 Elsevier Inc. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2019052717250
Tiivistelmä
Abstract
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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