Time-varying homotopy and the animation of facial expressions for 3d virtual space teleconferencing

Souichi Kajiwara, Hiromi T. Tanaka, Yasuichi Kitamura, Jun Ohya, Fumio Kishino

Research output: Contribution to journalConference articlepeer-review


A homotopy describes the transformation of one arbitrary curve into another that shares the same endpoints. In this paper, we propose a deformable cylinder model, based on homotopy, in which an arbitrary surface interpolated between two contours via a blending function is transformed into another surface over time. We then show how this homotopic deformation can be applied to the realistic animation of human faces in a virtual space teleconferencing system. Specifically, we show that facial expressions such as wrinkling of the forehead and opening and closing of the mouth can be synthesized and animated in real time through 3D homotopic deformations.

Original languageEnglish
Pages (from-to)37-48
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1993
Externally publishedYes
EventVisual Communications and Image Processing 1993 - Cambridge, MA, United States
Duration: 1993 Nov 71993 Nov 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Time-varying homotopy and the animation of facial expressions for 3d virtual space teleconferencing'. Together they form a unique fingerprint.

Cite this