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Representing Flow

Representing Flow. Colin Ware UNH. We can do better than this. Vector components Direction Magnitude. 2D vector fields. Orientation. Vector sign bit. 2D Flow visualization. A landmark study. Orient Direction Magnitude. - Image courtesy of Dr.Laidlaw et al. Perceptual issues.

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Representing Flow

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  1. Representing Flow Colin Ware UNH

  2. We can do better than this

  3. Vector components Direction Magnitude 2D vector fields Orientation Vector sign bit

  4. 2D Flow visualization • A landmark study • Orient • Direction • Magnitude - Image courtesy of Dr.Laidlaw et al.

  5. Perceptual issues • Luminance contrast for detail • Red on green is hard to see (illustrate) • Natural semantics for signalling “more” • Longer • Wider • More dense • More contrasty • More vivid The background is critical

  6. Particle systems for flow vis. • Particles are born (randomly in space) • Have a behavior (moving with the flow) • They leave a trail (a pathline) • Color can change (with speed or age) • Width can change (speed or age) • Particles die

  7. Theory of contour finding Contour finding mechanisms A single column in V1 Field Hayes Hess

  8. The next stage – rapid propagation Prediction Weakest Contour Signal Strongest Contour Signal

  9. 2D Flow visualization • A landmark study • Orient • Direction • Magnitude - Image courtesy of Dr.Laidlaw et al.

  10. Halle, 1868 How to add VSB? Asymmetry along path Terminations Some neurons respond only with terminations in the receptive field. Halle’s “little stroaks” Fowler and Ware (1988)

  11. Continuity tangential to flow sream Lightness contrast with background (clarity) Show direction using asymmetry along path Use color width | length | contrast | density for speed, or a combination Add symbols if you like Trace forward and/or backward. Important factors

  12. A real challenge

  13. Many sliders

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