Bouvier-2007-MCISMCD - Motion Cues for Illustration of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Motion Cues for Illustration of Skeletal Motion Capture Data Simon Bouvier-Zappa Victor Ostromoukhov Pierre Poulin LIGUM, D´ep. I.R.O., Universit´e de Montr´eal (a) (b) (c) (d) Figure 1: Non-photorealistic illustration of motion capture sequences: (a) spin kick, (b) dancing pirouette, (c) cart wheel, (d) bending-over. Each motion is emphasized using motion arrows, noise waves, and/or stroboscopic motion. Abstract There are many applications for which it is necessary to illustrate motion in a static image using visual cues which do not repre- sent a physical entity in the scene, yet are widely understood to convey motion. For example, consider the task of illustrating the desired movements for exercising, dancing, or a given sport tech- nique. Traditional artists have developed techniques to specify de- sired movements precisely (technical illustrators) and suggest mo- tion (cartoonists) in an image. In this paper, we present an interactive system to synthesize a 2D image of an animated character by generating artist-inspired motion cues derived from 3D skeletal motion capture data. The primary cues include directed arrows, noise waves, and stroboscopic mo- tion. First, the user decomposes the animation into short sequences containing individual motions which can be represented by visual cues. The system then allows the user to determine a suitable view- point for illustrating the movement, to select the proper level in the joint hierarchy, as well as to fine-tune various controls for the depic- tion of the cues themselves. While the system does provide adapted default values for each control, extracted from the motion capture data, it allows fine-tuning for greater expressiveness. Moreover, these cues are drawn in real time, and maintain a coherent display with changing viewpoints. We demonstrate the benefit of our interactive system on various motion capture sequences. CR Categories: I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism—Animation I.3.3 [Computer Graphics]: Picture/Image Generation—Display and Viewing algorithms 1 Introduction The verbal conveyance of an idea is a powerful medium for shar- ing precise thoughts. However, a well-illustrated image may also bring an instant understanding of the subject matter. For example, Tufte [1997] says that “ to document and explain a process, to make verbs visible, is at the heart of information design .” This princi- ple has always been a concern in illustrations of all kinds, from strict technical designs to more permissive cartoon comics. Visual cues are powerful tools in graphic arts that compensate the inher- ent limitations of the visualization medium. Motion cues fall into this category, emphasizing temporal information from a dynamic 3D world into a static 2D representation....
View Full Document

This note was uploaded on 05/20/2011 for the course CAP 6701 taught by Professor Staff during the Spring '08 term at University of Florida.

Page1 / 8

Bouvier-2007-MCISMCD - Motion Cues for Illustration of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online