Adapting motion capture data using weighted real-time inverse kinematics

ABSTRACT

In this article we present a technique that enhances an inverse kinematics (IK) solver such that when the results are applied to a computer character, we can generate a level of individualization tailored to both the character and the environment, e.g., a walking motion can become "stiffer" or can be turned into a limping motion. Since the technique is based on an IK solver, we also have the desirable effect of solving retargetting issues when mapping motion data between characters. As the individualization aspect of our technique is very tightly coupled with the inverse kinematics solver, we can achieve both the individualization and retargetting of characters in real time.

REFERENCES

• 1: David C. Brogan , Ronald A. Metoyer , Jessica K. Hodgins, Dynamically Simulated Characters in Virtual Environments, IEEE Computer Graphics and Applications, v.18 n.5, p.58-69, September 1998 [doi>10.1109/38.708561]
• 2: D. J. Densley , P. J. Willis, Emotional posturing: a method towards achieving emotional figure animation, Proceedings of the Computer Animation, p.8, June 04-07, 1997
• 3: Martin Fêdor, Application of inverse kinematics for skeleton manipulation in real-time, Proceedings of the 19th spring conference on Computer graphics, April 24-26, 2003, Budmerice, Slovakia [doi>10.1145/984952.984986]
• 4: Michael Gleicher, Retargetting motion to new characters, Proceedings of the 25th annual conference on Computer graphics and interactive techniques, p.33-42, July 1998 [doi>10.1145/280814.280820]
• 5: Jessica K. Hodgins , Nancy S. Pollard, Adapting simulated behaviors for new characters, Proceedings of the 24th annual conference on Computer graphics and interactive techniques, p.153-162, August 1997 [doi>10.1145/258734.258822]
• 6: Jessica K. Hodgins , Wayne L. Wooten , David C. Brogan , James F. O'Brien, Animating human athletics, Proceedings of the 22nd annual conference on Computer graphics and interactive techniques, p.71-78, September 1995 [doi>10.1145/218380.218414]
• 7: Taku Komura , Yoshihisa Shinagawa, Attaching physiological effects to motion-captured data, No description on Graphics interface 2001, p.27-36, June 07-09, 2001, Ottawa, Ontario, Canada
• 8: Kraus, M. 2004. Human motion and emotion parameterization. In Proceedings of the Conference of the Central European Seminar on Computer Graphics.
• 9: Meredith, M. and Maddock, S. 2004a. Real-time inverse kinematics: The return of the Jacobian. Tech. Rep. CS-04-06, Dept. of Computer Science, Univ. of Sheffield.
• 10: Meredith, M. and Maddock, S. 2004b. Individualised character motion using weighted real-time inverse kinematics. Game-On (2004).
• 11: Park, J., Kang, Y., Kim, S., and Cho, H. 1997. Expressive character animation with energy constraints. In Proceedings of the Compugraphics 97 Conference. 260-268.
• 12: Deepak Tolani , Ambarish Goswami , Norman I. Badler, Real-time inverse kinematics techniques for anthropomorphic limbs, Graphical Models and Image Processing, v.62 n.5, p.353-388, Sept. 2000
• 13: Unuma, M. and Takeuchi, R. 1993. Generation of human motion with emotion. Computer Animation (1993), 77-88.
• 14: Munetoshi Unuma , Ken Anjyo , Ryozo Takeuchi, Fourier principles for emotion-based human figure animation, Proceedings of the 22nd annual conference on Computer graphics and interactive techniques, p.91-96, September 1995 [doi>10.1145/218380.218419]
• 15: Vicon Motion Systems ltd. 2004. http:// www.vicon.com.
• 16: Alan Watt , Mark Watt, Advanced animation and rendering techniques, ACM Press, New York, NY, 1991
• 17: Jianmin Zhao , Norman I. Badler, Inverse kinematics positioning using nonlinear programming for highly articulated figures, ACM Transactions on Graphics (TOG), v.13 n.4, p.313-336, Oct. 1994 [doi>10.1145/195826.195827]

INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.7 Three-Dimensional Graphics and Realism
          Subjects: Animation

General Terms:
Design, Experimentation, Performance

Keywords:
animation, games, inverse kinematics, motion capture data, software