Iterative Frame Decimation and Watermarking for Human Motion Animation Shiyu Li and Masahiro Okuda Faculty of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, Japan

1. Iterative Frame Decimation and Watermarking for Human Motion Animation Shiyu Li, Masahiro Okuda Faculty of Environmental Engineering, The University of Kitakyushu 1-1,Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, Japan [lishiyu, okuda-m]@env.kitakyu-u.ac.jp http://vig.is.env.kitakyu-u.ac.jp/

2. PRELIMINARY Body Skeleton Configuration root terminator end effector link

9. Hierarchical Human Motion Compression with Constraints on Frames Data Compensation for joint i+ 1 Input : joint i Wavelet Transform: c 0 ,w 0 ,w 1 ,...,w j -1 ,c j -1 Max-Shift for Constraint frames (Scale up) Entropy Coding Hierarchical Quantization Dequantization Hierarchically Inverse Operation (Decoder) Inverse Wavelet Transform: c 0 ,w 0 ,w 1 ,...,w j -1 ,c j -1 Max-Shift for Constraint frames (Scale down) Entropy Decoding Input bits Convert to Euler- angle format Output : joint i Convert to two- angle format Output bits Encoder Decoder

10. Kinematics-based motion compression for human figure animation Endcoder Decoder Entropy decoding dequantization Position calculation Prediction by IK Compressed angles of previous frame Converted Two angles Angle conversion Bits of end- effectors Entropy decoding dequantization Convert all joints to original angle format Bits of general other joints Orientation Angle retrieval General other joints Position calculation quantization Entropy coding decoding Com- pressed position Prediction by IK Calculate prediction error quantization decoding End effectors Simple prediction Compressed angles of previous frame Orientation calculation Entropy coding Simple prediction Converted format