Form Perception - Sccoer.net

brasscoffeeAI and Robotics

Nov 17, 2013 (3 years and 8 months ago)

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Form Perception

Midlevel Vision


Combine features into objects


Early visual processing


Interprets what we see


Committee


Laws of organization


Visual illusions


Gestalt Laws


Form or configuration of a pattern


Universal patterns we recognize as a
group


Sum is greater than the parts

Specific Laws


Web site:
http://sites.sinauer.com/wolfe3e/chap4/star
tF.htm


Chapter 4

Occlusion


Kaniza figure


Contours not really there


Visual system infers that square is
occluding the circle

Occlusion


Relatability


Edges relate across gaps


Figure Ground


Segmentation


Surroundness


Size


Symmetry


Parallelism

Global Superiority Effect


Our global perception can inhibit local
perception

Models of Object Recognition


Template model


Problem is that we need to many
templates


Not enough neurons to handle this.


Models of Object Recognition


Structural model


Assumes that common structures give rise
to the perception of the object.


Should be independent of viewpoint


Point of View

Models of Object Recognition


Pandomonium model


Recognition by committee


Neural network that can learn


Models of Object Recognition


Website:
http://sites.sinauer.com/wolfe3e/chap4/star
tF.htm

Face Recognition


Face inversion effect


http://www.michaelbach.de/ot/


Face Recognition


Prosopagnosia: patient has difficulty
identifying faces.


May know it is a face but not who it is.


Can recognize other objects.


Object Recognition


What pathway


Temporal lobe


Agnosia

Types of Agnosia


Poor perception of whole picture


Problems associated object with name


Can be in quite specific categories

Types of agnosia


Color


Specific categories


Alexia

Form Perception


Infants


Habituation


Form constancy


Figure ground

Form Perception


Feature analysis


Comparison


Memory


Developmental characteristics