Object recognition

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What is Marrs 3 level analysis?
Computational: Aerodynamics, Algorithmic: Thurst, Surface area, Implementational: Feathers, insect wings, bat wings
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Template matching model?
Recognise visual inputs, match exact pattern of light on retina with previously remembered patterns
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Feature detector models?
feature detector neurons:Code for specific objects
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Structural description model?
Goals of vision, describe object unambiguously
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What do we want?
A system that is invariant to transformations in view point and illumination
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Marr and Nishihara's criteria?
Accessibility, scope, uniqueness, stability and sensitivity
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Which co-ordinate system should this representation use?
Viewer centred, object centred
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What are Geons?
Geons have properties that are retained in any 2D projection: Co-linearity, symmetry, parallelism and co-termination
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How many geons are there?
Less than 36
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View dependent model
Brute association of arbitary image with object, cordinate system is viewer based, primitives are sub regions of the image, not whole image as in early template matching models
10 of 10

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Card 2

Front

Template matching model?

Back

Recognise visual inputs, match exact pattern of light on retina with previously remembered patterns

Card 3

Front

Feature detector models?

Back

Preview of the front of card 3

Card 4

Front

Structural description model?

Back

Preview of the front of card 4

Card 5

Front

What do we want?

Back

Preview of the front of card 5
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