Object Recognition

Question 1

How does object recognition carry out ?

Answer 1

Visual pathways
Left and right
Optic chiasma and lateral genicAte and so on

Question 2

3 stages of object recognition

Answer 2

Local features - extract local features such as edges and contrast

Shape representation- gestalt principles come into place and feature integration. Integrate things into basic features such as edges into corners to form simple shapes

Object representation- recognise by what we know as familiar , stored representations

Question 3

What are gestalt principles ?

Answer 3

Proximity
Similarity
Good continuation
Closure

Question 4

What is top down processes

Answer 4

Perceptions are influenced by expectations, existing beliefs and understanding

Question 5

What is bottom up prcessss

Answer 5

Focussed on incoming sensory input. Goes to retina and visual cortex

Question 6

What is bi stable stimulus

Answer 6

Oscillates between 2 images

Question 7

Shapes appear different because of what?

Answer 7

Hard boundary - line separating them assumes they are different objects and emphasises differences in colour

Apparently source of shade. - visual systems that things looks different in shade and darker so tries to compensate and increase brightness

Question 8

What did mar 1982 say about shape perception?

Answer 8

Bottom up processes cause primal sketches which are integrated into huge primitives

Top down - group primitives into lines , curves larger blobs ( symbolic primitives)