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http://dx.doi.org/10.5909/JBE.2014.19.3.342

Digital Watermarking on Image for View-point Change and Malicious Attacks  

Kim, Bo-Ra (Dept. of Electronic Materials Engineering Kwangwoon University)
Seo, Young-Ho (School of Liberal Arts, Kwangwoon University)
Kim, Dong-Wook (Dept. of Electronic Materials Engineering Kwangwoon University)
Publication Information
Journal of Broadcast Engineering / v.19, no.3, 2014 , pp. 342-354 More about this Journal
Abstract
This paper deals with digital watermarking methods to protect ownership of image with targeting the ultra-high multi-view or free-view image service in which an arbitrary viewpoint image should be rendered at the user side. The main purpose of it is not to propose a superior method to the previous methods but to show how difficult to construct a watermarking scheme to overcome the viewpoint translation attack. Therefore we target the images with various attacks including viewpoint translation. This paper first shows how high the error rate of the extracted watermark data from viewpoint-translated image by basic schemes of the method using 2DDCT(2D discrete cosine transform) and the one using 2DDWT(2D discrete wavelet transform), which are for 2D image. Because the difficulty in watermarking for the viewpoint-translated image comes from the fact that we don't know the translated viewpoint, we propose a scheme to find the translated viewpoint, which uses the image and the corresponding depth information at the original viewpoint. This method is used to construct the two non-blind watermarking methods to be proposed. They are used to show that recovery of the viewpoint affect a great deal of the error rate of the extracted watermark. Also by comparing the performances of the proposed methods and the previous ones, we show that the proposed ones are better in invisibility and robustness, even if they are non-blind.
Keywords
Ownership ptotection; Digital watermarking; 3D warping; Depth-image-based rendering (DIBR);
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