DOI QR코드

DOI QR Code

Creating Stick Figure Animations Based on Captured Motion Data

모션 캡쳐 데이터에 기초한 스틱 피규어애니메이션 제작

  • Choi, Myung Geol (Dept. of Media Technology and Media Contents, The Catholic University of Korea) ;
  • Lee, Kang Hoon (Dept. of Computer Science, Kwangwoon University)
  • 최명걸 (가톨릭대학교 미디어기술콘텐츠학과) ;
  • 이강훈 (광운대학교 컴퓨터소프트웨어학과)
  • Received : 2015.02.07
  • Accepted : 2015.02.26
  • Published : 2015.03.01

Abstract

We present a method for creating realistic 2D stick figure animations easily and rapidly using captured motion data. Stick figure animations are typically created by drawing a single pose for each frame manually for the entire time interval. In contrast, our method allows the user to summarize an action (e.g. kick, jump) for an extended period of time into a single image in which one or more action lines are drawn over a stick figure to represent the moving directions of body parts. In order to synthesize a series of time-varying poses automatically from the given image, our system first builds a deformable character model that can make arbitrary deformations of the user's stick figure drawing in 2D plane. Then, the system searches for an optimal motion segment that best fits the given pose and action lines from pre-recorded motion database. Deforming the character model to imitate the retrieved motion segment produces the final stick figure animation. We demonstrate the usefulness of our method in creating interesting stick figure animations with little effort through experiments using a variety of stick figure styles and captured motion data.

본 논문은 모션 캡쳐 데이터를 이용하여 쉽고 빠르게 사실적인 2차원 스틱 피규어애니메이션을 제작할 수 있는 방법을 소개한다. 스틱 피규어 애니메이션은 대개 전체 시간 구간에 대하여 매 프레임마다 하나씩의 자세를 일일이 그리는 방식으로 제작된다. 반면, 제안된 방법에서는 스틱 피규어 형태의 자세 위에 신체 부위의 움직임을 나타내는 동선을 추가하는 방식으로 한 장의 그림 안에 여러 프레임에 걸친 동작(예를 들어, 발차기나 점프)을 축약하여 표현하도록 한다. 이러한 그림으로부터 자동으로 시간에 따른 자세 변화를 합성하기 위하여, 먼저 사용자가 그린 스틱 피규어를 2차원 평면에서 변형시킬 수 있는 캐릭터 모델을 생성한다. 이 후, 미리 구축된 모션 데이터베이스로부터 주어진 자세 및 동작선 정보에 가장 근접한 동작 구간을 검색한다. 검색 결과로 추출된 동작에 따라 캐릭터 모델을 변형시킴으로써 최종적인 스틱 피규어애니메이션을 합성한다. 여러 형태의 스틱 피규어에 이동, 격투 등의 다양한 동작을 적용한 실험을 통하여, 제안된 방법이 적은 노력만으로 흥미로운 스틱 피규어애니메이션을 제작하는데 매우 유용함을 확인하였다.

Keywords

References

  1. B. Gooch and A. Gooch, Non-photorealistic rendering. AK Peters, Ltd., 2001.
  2. J. Northrup and L. Markosian, "Artistic silhouettes: a hybrid approach," in Proceedings of the 1st international symposium on Non-photorealistic animation and rendering. ACM, 2000, pp. 31-37.
  3. R. D. Kalnins, P. L. Davidson, L. Markosian, and A. Finkelstein, "Coherent stylized silhouettes," in ACM Transactions on Graphics (TOG), vol. 22, no. 3. ACM, 2003, pp. 856-861. https://doi.org/10.1145/882262.882355
  4. P. Benard, F. Cole, M. Kass, I. Mordatch, J. Hegarty, M. S. Senn, K. Fleischer, D. Pesare, and K. Breeden, "Stylizing animation by example," ACM Transactions on Graphics (TOG), vol. 32, no. 4, p. 119, 2013.
  5. J.Wang, S. M. Drucker, M. Agrawala, and M. F. Cohen, "The cartoon animation filter," in ACM Transactions on Graphics (TOG), vol. 25, no. 3. ACM, 2006, pp. 1169-1173. https://doi.org/10.1145/1141911.1142010
  6. A. Rivers, T. Igarashi, and F. Durand, "2.5 d cartoon models," in ACM Transactions on Graphics (TOG), vol. 29, no. 4. ACM, 2010, p. 59.
  7. T. Igarashi, T. Moscovich, and J. F. Hughes, "As-rigid-aspossible shape manipulation," ACM transactions on Graphics (TOG), vol. 24, no. 3, pp. 1134-1141, 2005. https://doi.org/10.1145/1073204.1073323
  8. J. Pan and J. J. Zhang, "Sketch-based skeleton-driven 2d animation and motion capture," in Transactions on edutainment VI. Springer, 2011, pp. 164-181.
  9. M. Thorne, D. Burke, and M. van de Panne, "Motion doodles: an interface for sketching character motion," ACM T Graphic (SIGGRAPH 2007), p. 24, 2007.
  10. CMU-Graphics-Lab, "CMU motion capture database, http://mocap.cs.cmu.edu/."
  11. Max-Planck-Institut, "Motion capture database HDM05, http://www.mpi-inf.mpg.de/resources/HDM05/," 2005. [Online]. Available: http://www.mpiinf.mpg.de/resources/HDM05/
  12. SNU-Movement-Research-Lab, "SNU motion database, http://mrl.snu.ac.kr/mdb/," 2009. [Online]. Available: http://mrl.snu.ac.kr/mdb/
  13. J. Lee, J. Chai, P. S. A. Reitsma, J. K. Hodgins, and N. S. Pollard, "Interactive control of avatars animated with human motion data," ACM T Graphic (SIGGRAPH 2002), vol. 21, no. 3, pp. 491-500, 2002.
  14. L. Kovar, M. Gleicher, and F. Pighin, "Motion graphs," ACM T Graphic (SIGGRAPH 2002), vol. 21, no. 3, pp. 473-482, 2002.
  15. J. Min, Y.-L. Chen, and J. Chai, "Interactive generation of human animation with deformable motion models," ACM T Graphic, vol. 29, pp. 9:1-9:12, 2009.
  16. C. Mao, S. Qin, and D. Wright, "A sketch-based gesture interface for rough 3d stick figure animation." Eurographics, 2005.
  17. M. G. Choi, K. Yang, T. Igarashi, J. Mitani, and J. Lee, "Retrieval and visualization of human motion data via stick figures," Computer Graphics Forum, vol. 31, no. 7, pp. 2057- 2065, 2012.
  18. I. Yoo, J. Vanek, M. Nizovtseva, N. Adamo-Villani, and B. Benes, "Sketching human character animations by composing sequences from large motion database," The Visual Computer, vol. 30, no. 2, pp. 213-227, 2014. https://doi.org/10.1007/s00371-013-0797-1