• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.6
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• pp.68-73
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• 2008

In this paper, we propose watermark algorithm called TDWA(Time-Division Watermarking Algorithm) and we applied the proposed algorithm to H.264 video coding standard. We establish that a proposed algorithm is applied to H.264 baseline profile CODEC. The proposed algorithm inserts a watermark into the spatial domain of several frames. We can easily insert strong and invisible watermarks into original pictures using this method. For verification of the proposed algorithm we design hardware core using Verilog-HDL and Excalibur for JM 8.7 code with hardware & software co-simulation. As a result of verification, the PSNR between watermarked pictures and original pictures are more than 60dB and we found the watermark is kept more than 80% after encoding of H.264/AVC with quantization parameter of 28 in baseline profile.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.43 no.6 s.312
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• pp.71-82
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• 2006

For real-time animation, keyframe animation that consists of translation, rotation, scaling transform nodes is used widely in 3D graphics. This paper presents geometrical watermarking using vertex coordinates in CoordIndex node and interpolator watermarking using keyvalues in PositionInterpolator node for 3D keyframe animation based on VRML. Experimental results verify that the proposed algorithm has the robustness against geometrical attacks and timeline attacks as well as the invisibility.

• Journal of Advanced Navigation Technology
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• v.12 no.1
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• pp.74-81
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• 2008

In this paper, adaptive watermarking algorithm which based on fuzzy reasoning and hybrid scheme is presented. To enforce the time and space complexity, hybrid scheme which utilize a color information as well as visual characteristics is also addressed. Proposed approach have double-aim: in first to use the visual characteristics so as to enforce the robustness of watermarking, and in second to select the optimal sub-band which is to be embedded a watermark. One of the principal advantage is that this approach involved the fuzzy inference module which is designed to select an optimal sub-band from the DWT coefficient blocks. In order to demonstrate the effectiveness of proposed algorithm, some numerical experiments of robustness and imperceptibility are evaluated with respect to such attacks as JPEG compression, noise and cropping.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.407-408
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• 2006

In this paper, we propose a new reversible image authentication technique based on watermarking where if the image is authentic, the distortion due to embedding can be completely removed from the watermarked image after the hidden data has been extracted. This technique utilizes histogram characteristics of the difference image and modifies pixel values slightly to embed more data than other reversible data hiding algorithm. The proposed scheme is quite simple and the execution time is rather short. Experimental results demonstrate that the proposed scheme can detect any modifications of the watermarked image.