Motion lenses: cinematography-based viewpoint selection for motion data

  • Authors:

  • Shi-Nine Yang;Ke-Sen Huang;Hao-Ming Chen

  • Affiliations:

  • Chung Yuan Christian University, Taiwan;National Tsing Hua University, Taiwan;National Tsing Hua University, Taiwan

  • Venue:
  • Proceedings of the 2009 Computer Graphics International Conference
  • Year:
  • 2009

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Abstract

Camera control plays an important role in computer graphics for producing expressive images or animations. An appropriate viewing setting usually enhances the richness and quality of the generated results. In this paper, we propose an automatic method to determine the viewing parameters (e.g., camera position, camera distance) of motions based on the cinematography, artistic composition, and film editing rules. Our method addresses four main issues embedded in this problem: camera placement, shot determination, view selection of shot, and view refinement. For the first issue, based on cinematographic rules, we argue that character's vision and orientation as features, which are used to determine the number of cameras and their positions. For the second issue, we propose a motion segmentation method to convert a sequence into motion cuts, which represent the shots of the motion. For the third issue, a view selection algorithm based on visibility measure is devised to select an appropriate camera (view). For the fourth issue, we finalize the camera parameters by considering type of shot, common visual axis, and artistic composition. Comparing to fixed-view shots, our results convey more information by providing viewers with better visual appeal and scene understanding.