1. Robust Motion Watermarking based on Multiresolution Analysis EUROGRAPHICS 2000 Speaker: 彭任右, GAME Lab Date: 4/18/2005

2. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 2 Outline Introduction Framework Results Conclusions & Future Work

3. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 3 Introduction Multiresolution Representation A coarse base signal. A hierarchy of motion displacement maps. Spread Spectrum Embed a watermark into a wide range of frames in a motion signal. Watermarking Perturbing larger detail coefficients in displacement maps.

4. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 4 Displacement Map Reduction Smoothing followed by down-sampling Expansion By subdividing Up-sampling followed by smoothing M = M ’ ⊕ D

5. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 5 Multiresolution Representation M (N) ： The original motion M (0) ： The coarsest signal Original Signal M (3) M (2) M (1) M (0)

6. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 6 Watermarking Perturb large coefficient (robust) with small magnitude (imperceptible).

7. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 7 Watermark Generation Watermark w = {w 1, …, w m } w i is sampled independently from a normal distribution with zero mean and unit variance. Use MD5 (Cryptographic hash function) to seed random number generator.

8. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 8 Watermark Extraction

9. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 9 Similarity Remove outliers which differences from the mean value are greater than a threshold. Linear Correlation

10. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 10 Motion Aligning Resist the Crop or Non-uniformly Scale. Using the Dynamic Time Warping scheme.

11. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 11 Results

12. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 12 Results false-positive The probability of incorrectly asserting that the data is watermarked.

13. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 13 Results

14. Alvin/GAME Lab./CSIE/NDHU Robust Motion Watermarking based on Multiresolution Analysis 14 Conclusions & Future Work A practical method to watermark a motion. Two novel ideas: Spread Spectrum and Multiresolution Representation Robust to various signal processing Resilient to more complex motion editing.