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Perception and Visualization

  • Human perception important aspect of visualization
  • Pre attentive processing: low level visual system rapidly processes certain basic features of an image (<200 ms).
  • Post attentive processing: what happens to our visual representation of an object afer we stop looking at it

Pre attentive Processing

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Pre attentive Processing

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Pre Attentive Processing

### Conjunction

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Post Attentive Processing

Change blindess

Spot the difference!

Change blindess

Spot the difference!

Further Features/Markers

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Accuracy of visual markers

From Ceveland and McGill

  1. Position along a common scale
  2. Positions along non-aligned scales
  3. Length, direction, angle
  4. Area
  5. Volume, curvature
  6. Shading, colour saturation

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