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ThinkMind // International Journal On Advances in Software, volume 10, numbers 3 and 4, 2017 // View article soft_v10_n34_2017_6


Watermarking Technique for Images Captured with Cameras Using Color–Difference-Modulated Light

Authors:
Kazutake Uehira
Hiroshi Unno

Keywords: Watermarking patterns; information embedding; portrait rights

Abstract:
We propose a new optically written watermarking technique that can protect the portrait rights of real objects. It produces a watermarking pattern in the illumination light by modulating color differences. The illumination light that contains such watermarking is projected onto an object. An image of the object taken by a camera contains the same watermarking, which can be extracted by image processing. Therefore, this technique can protect the portrait rights of real objects. We discovered three findings through simulation where binary data were embedded as watermarking and we evaluated the accuracy with which the binary data were read out. The first was that the accuracy when color differences were modulated was higher than that when brightness was modulated. The second was that errors in reading out embedded binary data particularly tended to occur in dark areas, yellow areas, and areas that contained fine textures. The third was that we could satisfy both the invisibility and readability requirements of embedded data by using appropriate amplitudes of modulation.

Pages: 231 to 240

Copyright: Copyright (c) to authors, 2017. Used with permission.

Publication date: December 31, 2017

Published in: journal

ISSN: 1942-2628

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