wk 5 SP Flashcards

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1
Q

Two approaches to perception of form and organisation

A

Marr’s approach, concerned with contrast change

Gestalt approach, concerned with rules of perceptual organisation

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2
Q

Marr’s approach to perception of form and organisation (process)

A

Retinal image is analysed sequentially at different levels:

Retinal image –> Grey level description ( measure intensity of light at each point)
—> Primal sketch (representation of contrast change e.g. blobs, edges, bars etc)
–> 2 1/2 D sketch ( representation of orientation, depth, colour ,relative to observer,) Its not 3D because it is observer-orientated. (unseen parts of scene
and objects)
—> 3D representation- representations of objects independent to observer

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3
Q

Gestalt laws of perceptual
organisation

A
  1. similarity
  2. Good continuation (lines follow smoothest path)
  3. Proximity (close = grouped)
  4. Connectedness (physically connected = unit)
  5. Closure (e.g 4 on a dice looks like a square)
  6. Common fate (moving together in same direction = grouped)
  7. Familiarity ( once discovered one indicator of object, don’t need all)
  8. Invariance (recognise under diff visual situations)
  9. Pragnanz- “good figure” (central law- most simple + stable shape)
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4
Q

Figure-ground segregation- properties effecting whether area is seen as figure or ground are:

(background or foreground)

A
  • symetry (symetry usually figure)
    -Convexity (convex usually figure)
    -Area (smaller area usually figure)
    -Orientation (vertical + horizontal usually figure
    -Meaning/importance. this implies top-down processiing occurs here
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5
Q

maybe do more on bottom up and top down

A
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