Visual Pattern Recognition Flashcards
1
Q
Template Matching Theory
A
- Visual stimulus compared to specific patterns (templates) in memory.
- Identity determined by which template had greatest amount of overlap.
- Real life: # on bottom of check, handwritten notes
2
Q
Feat Analysis Theory
A
Take into account specific combinations of basic features
- Alphabet: lines (horizontal, vertical, diagonal), curves, intersections
- A = 1 L-slant diagonal, 1 R-slant diagonal, 1 horizontal in b/t
- Strength: No need to store huge # of templates. Variations in size, color, shape irrelevant
- Weakness: don’t take into account context on pattern recognition
3
Q
Pandemonium Exp.
A
- Feature analysis w/ letters
- stages characterized by activity of “mental demons” that represent whole letters or their basic features.
- activity-> “shouting”
- Image Demon: Detect neural signal from sensory receptors & passes info to Feature Demons
- Feature Demons: 28 (block, cursive, caps, lower-case). Each compare itself to stim from Image Demon; “shout” if match
- Cognitive Demon: reps specific combo of feats (one for lower & uppercase version of each letter).
- Decision Demon: Identifies pattern Which CD is shouting loudest?
- more recognition errors if multiple Cog Demons shouting loudly (E:. F vs O).
4
Q
Recognition by Components
A
Takes into account specific combinations of basic features
- Simple 3-D shapes called geons (36)
- If geons are basic features, expect more recog failures when:
- (1) geons are removed than when segments of geons are removed.
- Each item presented for brief
Intervals with equal amount deleted across conditions. - Task: Name the object
- Result: Ps made 25% more errors
w/ intersections deleted
5
Q
CAPTCHA
A
Completely Automated Public Turing test to tell Computers and Humans Apart
6
Q
Data-Driven Processing
A
Bottom-Up
Pattern recognition is driven by the physical stimulus only
7
Q
Conceptually-Driven Processing
A
Top-Down
Pattern recognition is also influenced by context and general knowledge
