Chap 5 Flashcards
Middle vision
involves the perception of address and surfaces
Determines which regions of an image should be grouped together into objects
Comes after basic features have been extracted from image and before object, recognition and seen understanding
How do you find edges?
Cells in primary visual cortex have small receptive fields
You know what I just go together because of the feature binding problem
Illusory contour
A contour that is perceived, even though nothing changes from one side of the contour to the other in the image
Communicate with each other to determine what an object is
Gestalt grouping rules
A set of rules that describe when elements in an image will peer to group together
Gestalt rules of contour
Good continuation: two elements will tend to group together if they lie in the same contour
Parallelism : parallel, contours make things similar
Common region : two features will group if they appear to be a part of the same larger region
Connectedness : two items will tend to group if they are connected
Commonfate : elements that moved in the same direction tend to group together
Synchronicity : elements that change at the same time to the group together
Oliver selfridege(1959)
The pandemonium model letter recognition
The demon model that loosely represent neurons
Oliver selfridege(1959)
The pandemonium model letter recognition
The demon model that loosely represent neurons
Ambiguous figure
A visual stimulus, I guess rise to two or more interpretations of his identity of structure
Accidental viewpoint
A viewing position that produces some regularity in the visual image that is not presented in the world
Gaul figure ground assignment principles
Surrounded- the surrounding region is likely to be grouped
Size - the smaller is likely to be figure
Symmetry - asymmetrical region tends to be seen as figure
Parallelism - regions with parallel contour to be seen as a figure
Extreme edges
If edges of an object are shaded such that they seem to recede in the distance, they tend to be seen as a figure
Relative motion
If one region moves in front of another, then the closer region is figure
Relatability
The degrees to which two line segments appeared to be a part of the same contour
Global superiority effect
The properties of the whole object takes precedence over the properties of parts of the object
Non-accidental feature
A feature on an object that is not dependent on the exact or accent of view position of the observer
T junctions
Indicate occlusion top of T is in Front and the stem of the T is in the back
Y Junction
Indicates corners facing the observer
Naïve template theory
The proposal that the visual system recognizes objects by matching the neural representation of the image with a stored representation of the same shape in the brain( top down)
Structural description
A description of an object, in terms of the nature of its constitutes parts, the responsibility between the parts
Object, recognition process levels
Entry-level category: for an object, the label that comes to mine must come quickly when we identify the object
Subordinate level category - a more specific terms for an object
Superpositionate - a more general term for an object
Prosopagnosia
An inability to recognize faces
Agnosia
An inability to recognize objects despite being able to see them
Double dissociation
When one particular function can be damaged without affecting the other thus object and face recognition must be processed by different systems at some level
Extrasiate cortex
The region of the cortex bordering the primary visual cortex and controlling multiple areas involved in visual processing
