Object Recognition and Face Recognition Flashcards Preview

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Flashcards in Object Recognition and Face Recognition Deck (36)
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Define object recognition

The ability to perceive an objects physical properties and apply semantic attributes


How do humans take in information?

Register large scale shapes and patterns AS QUICKLY AS small details


Mechelli et al (2004) said what about bottom up vs top down?

That's humans do bottom up first then top down


How do computers perceive objects?

They start with pixels (small details) "bottom up" and then build up


What are constancies?

What we see as the same, despite differences in dynamics


What's the context effect?

Some recognition requires an appreciation of context


What did Oliva & Torralba (2007) say about object recognition?

That objects in familiar context are recognised faster


What are the 5 steps to recognise an object?

1) see basic features
2) perceive organisation of features
3) perceive shape
4) compare shape to memory for knowledge
5) is the shape familiar, tap into knowledge


What is simultangnosia?

The inability to perceive how parts fit together


List the 3 models of object recognition

1) Template Matching
2) Feature recognition
3) Structural theories


What is the template matching model?

When an individual compares the whole object to stored representations to find a match


What is the feature recognition model?

Rather than focusing on the whole shape, feature models break down into critical features


What's Selfridges (1959) pandemonium model? Which 3 model does it come under?

It's a metaphorical description of levels of processing patterns before the whole

Feature recognition model


What's Marr & Nishiharas (1978) model? And what 3 models does it come under?

There are 3 levels of object recognition

1) primal sketch (edges and contours)
2) 2.5D sketch (shading and textures)
3) 3D model

The feature recognition model


What 3 things happen for recognition to occur?

1) single model axis
2) component axes
3) 3D model match (top down processing)


What is the structural theory? Using RBC theory

Biederman's recognition by components theory (1987)

Objects consist of combinations of geons
Object recognition is viewpoint invariant


What's greebles good for, using concavity importance?

Explores regions of concavity importance.

When presented with Greebles, individuals remained viewpoint dependent when recognising one even after training


What's dynamics of vision?

Focus on perception of static images by static observer


What's motion perception?

To perceive moving objects we must be able to pick up changes in stimulus over brief time intervals and recognise object in different stimuli. Humans are good at this.


What 2 things do object recognition depend on?

Sensory info and prior expectation


What plays an important role in object recognition that isn't mentioned?



What are the 4 challenges of object recognition?

Different classes of things recognised
From different angles
Partly occluded
Fully occluded


What 3 things make face recognition special?

The development
The configural processing


What's "developmental" face recognition?

Newborns are orientated towards upright face stimuli
Tendency to disappear after a month then reappear again (nakamo et al, 2014)


List the 3 types of "configural processing". What is configural processing?

People respond faster when top and bottom of faces are unaligned, like they normally are.

1) first order relations that define faces
(2 eyes, nose, mouth)

2) holistic processing
(glueing features together into gestalt)

3) second order relations
(spacing among features)


What's a famous example of configural processing?

Thatcher illusion (Thompson 1980)

Inverted face in which eyes and mouth remain normal, preserve facial expressions better than truly inverted faces


What's "mechanistic"?

Special brain areas devoted to face processing

-fusiform face area (FFA)
- superior temporal sulcus (STS)
- occipital face area (OFA)


What is object agonist? Use an example

Trouble recognising objects

E.g. Oliver sacks (1985) thought his wife was a hat


Whats face agonist?

Trouble recognising faces


What's prosopagnosia?

Face blindness