Measuring Tensions of Character Motions based on LMA

LMA를 기반으로 한 캐릭터 동작의 긴장도 측정

  • 곽창섭 (연세대학교 컴퓨터과학과) ;
  • 권지용 (연세대학교 컴퓨터과학과) ;
  • 이인권 (연세대학교 컴퓨터과학과)
  • Published : 2008.07.15

Abstract

In this paper, we propose the method to measure tensions of character motions, using LMA (Laban Movement Analysis). Using tension values, we tan take advantage of them as a standard for synchronization of motion and BGM(Back Ground Music). In LMA, a motion is divided into 4 space-time factors which are called Efforts, and each Effort has two bases opposed to each other. We can analyze the motion by justifying which basis is stronger than the other in each Effort of motion. To measure quantitatively tension values, we propose some equations based on kinematics and dynamics. Then we can measure the tension value by the weighted sum of values calculated from those equations. Each weight can be determined by the optimization process which tries to minimize the difference between the calculated tension value and human's decision. The experimental result shows that the in creasing order of the motion tension value is similar to that of the tension score given by human.

본 연구는 Laban이 제시한 모션 분석 기법을 이용하여 모션의 긴장도를 측정하는 방법을 제안한다. 이러한 긴장도 값을 이용하면 캐릭터 모션과 배경음악간의 자동적 동기화를 위한 기준값으로 사용할 수 있다. Laban의 모션 분석 기법, 즉 LMA는 모션을 Effort라고 명명된 4개의 시공간적 요소로 나누고 각 4개의 Effort마다 2가지 상반된 기준을 제시함으로써 모션을 분석하도록 하였다. 이러한 기준을 양적으로 측정하기 위해 우리는 운동학, 역학에 기초한 수식을 제안하고 이를 통해서 계산된 실제 긴장도 값을 실험 데이타에 근거하여 조정하였다. 실험을 통해 제안한 긴장도 측정 결과는 어느 정도 사람의 반응과 비슷한 정도의 순위 판별 능력을 보였다.

Keywords

References

  1. Jean Newlove, John Dalby, 신상미 역, "움직임.표현.기하학", 대한미디어, 2006
  2. Diane Chi, Monica Costa, Liwei Zhao, Norman Badler, "The EMOTE Model for Effort and Shape," Proceeding of SIGGRAPH 2000, ACM Computer Graphics Annual Conference, New Orleans, Louisiana, 173-182, 2000
  3. Shih-Pin Chao, Shi-Nine Yang and Tsang-Gang Lin, "An LMA-Effort simulator with dynamics parameters for motion capture animation," COMPUTER ANIMATION AND VIRTUAL WORLDS, 17, 167-177, 2006 https://doi.org/10.1002/cav.120
  4. Min-Joon Yoo, In-Kwon Lee, "Musical Tension Curves and its Applications," Proceeding of ICMC (International Computer Music Conference), 482- 486, 2006
  5. Kenji Amaya, Armin Bruderlin, Tom Calvert, "Emotion from motion," Proceedings of the conference on Graphics interface '96, 222-229, 1996
  6. 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, 91-96, 1995
  7. Zhao L. "In Synthesis and Acquisition of Laban Movement Analysis Qualitative Movement Parameters for Communicative Gestures," Ph.D. Dissertation, Computer and Information Department, University of Pennsylvania, 2001
  8. Zhao L, Badler N, "Acquiring and validating motion qualities from live limb gestures," Graphical Models 2005, 67(1), 1-16, 2005 https://doi.org/10.1016/j.gmod.2004.08.002