perceiving form and perceptual organisation Flashcards
what are the 5 stages in Marr’s approach to perceiving form
retinal image grey level description primal sketch 2 half D sketch 3D representation
how does primal sketch become 2 hald D sketch
primal is combined with depth cues, colours, motion
how is 3D rep formed
2 half sketch analysed for £D volume primitives (cyclinders, cones, cubes)
produces a 3D rep that is independent of observer
what does the Gesalt approach claim
dont see lines and figures but forms and shapes
what is perceptual organisation
we see objects according to all elements as a whole
what are gestalts 9 laws of perceptual organisation?
similarity good continuation proximity connectedness closure common fate familiarity invariance pragnanz
similarity
similar things appear grouped together
good continuation
points when connected make straight or curving lines
proximity
things near each other appear to be grouped together
connectedness
things physically connected are perceived as a unit
closure
of several geometrically perceptual organisations, a closed figure is preferred to an open figure
common fate
things moving in same direction or same orientation are grouped together
familiarity
things are more likely to form groups if groups appear familiar and meaningful
invariance
pragnanz
good figure
central law
of several geometrically possible organisations, one will occur with best, simplest and most stable shape
