Abstract
In this paper, we propose a method for reading a watermark from a printed binary image with a camera phone. The watermark is a small binary image which is protected with (15, 11) Hamming error coding and embedded in the binary image by utilizing flippability scores of the pixels and block based relationships. The binary image is divided into blocks and fixed number of bits is embedded in each block. A frame is added around the image in order to overcome 3D distortions and lens distortions are corrected by calibrating the camera. The results obtained are encouraging and when the images were captured freehandedly by rotating the camera approximately -2 - 2 degrees, the amount of fully recovered watermarks was 96.3%.
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Pramila, A., Keskinarkaus, A., Seppänen, T. (2009). Reading Watermarks from Printed Binary Images with a Camera Phone. In: Ho, A.T.S., Shi, Y.Q., Kim, H.J., Barni, M. (eds) Digital Watermarking. IWDW 2009. Lecture Notes in Computer Science, vol 5703. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03688-0_21
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DOI: https://doi.org/10.1007/978-3-642-03688-0_21
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-03687-3
Online ISBN: 978-3-642-03688-0
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