2. Object Recognition Flashcards
What is perception? (ccc object recognition)
Our ability to extract meaning from sensory input
What does perception include? (ccc object recognition)
- Audition
- Taste
- Touch
- Olfaction (Smell)
How many different types of senses do we have? (ccc object recognition)
9 - 22
What does the brain receive in the visual system? (ccc object recognition)
Sensory input
What does the cognitive system do in the visual system? (ccc object recognition)
Constructs the perception
What is the only part of the eye with a good clarity of vision? (ccc object recognition)
Fovea
What is the size of the blind spot for a human? (ccc object recognition)
An orange held at arms length
What pathway tells the brain ‘where’? (ccc object recognition)
The dorsal pathway
What pathway tells the brain ‘what’? (ccc object recognition)
The ventral pathway
What happens to image on the retina? (ccc object recognition)
It is inverted
What receives the encoded image of the visual fields from both eyes? (ccc object recognition)
The cerebral cortex
What is stage one of processing images? (ccc object recognition)
- Local features
- Edge detection and contrast can be seen
What is stage two of processing images? (ccc object recognition)
- Shape representation
- Gestalt principles and basic features
What is stage three of processing images? (ccc object recognition)
- Object representation
- Stored representation/knowledge
What is Gestalts principle? (ccc object recognition)
The whole visual percept is more than the sum of its parts
What processing is shape perception? (ccc object recognition)
Bottom up
What are the three stages to Marr’s Computational model? (ccc object recognition)
1) Primal sketch
2) 2 1/2 D sketch
3) The 3D model
What is stage one of Marr’s Computational model? (ccc object recognition)
- Variations of light
- Similar to a line drawing
- Detection of edges
What is stage two of Marr’s Computational model? (ccc object recognition)
- Orientation is present
- Distance can be seen
- Depth is visible
What is stage three of Marr’s Computational model? (ccc object recognition)
- Volume/space present
- Object entered, not viewer centred
- Shape fully understood
What is template matching? (ccc object recognition)
A theory that suggests a template is an internal representation. Template becomes a memory of which visual input can be matched to.
What is template matching also known as? (ccc object recognition)
Prototype theory
What does feature analysis assume? (ccc object recognition)
- Lower level features are analysed first
- Individual features are analysed and defined
Why is feature analysis flawed? (ccc object recognition)
V and X are both made up of / and \
What are geons? (ccc object recognition)
The viewpoint of an object, where on its own it is distinguished as a 2D object. When termination points are removed (by shading), the image becomes 3D.
