Visual Pattern Recognition
88K - views

Visual Pattern Recognition

Similar presentations


Download Presentation

Visual Pattern Recognition




Download Presentation - The PPT/PDF document "Visual Pattern Recognition" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.



Presentation on theme: "Visual Pattern Recognition"— Presentation transcript:

Slide1

Visual Pattern Recognition

Taylor J. MeekOctober 22, 2009

Evidence and Consequences of Feature Detection in The Visual Pattern Recognition of Reading by 

Taylor J. Meek is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.These original publications may be accessed electronically from: http://www.lingnik.com/visual-pattern-recognition

Slide2

Physiological Visual System

Difference Detectors and Visual AftereffectsFinding the Feature DetectorsBuilding Feature Detector Systems

Slide3

Difference Detectors

Input A

Input B

DifferenceDetector

+

-

A

B

No Activity

Basal Activity

+

-

No Activity

Base Level

+

-

No Activity

Base Level

Slide4

Difference Detectors

Red

Green

DifferenceDetector

+

-

Red

Green

No Activity

Neutral Color

(Yellow)

Red

Tired

No Activity

Base Level

Green

Tired

No Activity

Base Level

Slide5

Difference Detectors

Red

Green

DifferenceDetector

+

-

Red

Green

No Activity

Neutral Color

(Yellow)

Red

Tired

No Activity

Base Level

Green

Tired

No Activity

Base Level

Slide6

Difference Detectors

MovementUp

Movement Down

DifferenceDetector

+

-

Up

Down

No Activity

Basal Activity

+

-

No Activity

Base Level

+

-

No Activity

Base Level

Slide7

Aftereffects

Complementary Color Photoreceptors

Something More Abstract

“The

McCollough

Effect”

Slide8

Slide9

Slide10

Slide11

Slide12

Slide13

(Gibson & Harris 1968 in Lindsay & Norman 1977)

1

Slide14

(Gibson & Harris 1968 in Lindsay & Norman 1977)

2

Slide15

(Gibson & Harris 1968 in Lindsay & Norman 1977)

Slide16

Slide17

Slide18

Slide19

Difference Detectors

So what? Eye Transfer Color Desensitization Motion Detector Desensitization Orientation-specific Line Detectors

Slide20

Feature Detectors

EdgeSlit/LineDimness

++-++-++-

--+--+--+

+-++-++-+

-+--+--+-

+++++++++

---------

Slide21

Physiological Feature Detectors

Edge

Convex

Edge

MovingContrast(Edge)

Dimness

http://flickr.com/photos/thomashawk/90125879/Toad by Thomas Hawk, under CC License

Slide22

Feature Detectors in Higher-Order Species

Ganglion & Bi-Polar CellsOn-Center, Off-SurroundOff-Center, On-SurroundLight Onset, ExtinctionPeculiar Receptive FieldsColor Specificity, ContrastMovement (Directional)

(Lindsay & Norman 1977, p.215)

Light

Receptive

Field

Ganglion Cell

Slide23

Simple Feature Detector Cells in Higher-Order Species

Slit and LineEdge

++-++-++-

--+--+--+

+-++-++-+

-+--+--+-

Selective to:

Location

Type

Orientation/direction

W

idth

Slide24

Complex Feature Detector Cells in Higher-Order Species

Slit and LineEdge

++-++-++-

+-+

+-++-+

-+--+--+-

Selective to:

LocationTypeOrientation/directionWidth

--+

--+

--+

Slide25

Hyper-Complex Feature Detector Cells in Higher-Order Species

Size/Endpoint Termination

Movement (Axial Bidirectional)

Angle

Slide26

Hyper-Complex Feature Detector Cells in Higher-Order Species

Size/Endpoint Termination

Slide27

Hyper-Complex Feature Detector Cells in Higher-Order Species

Size/Endpoint Termination

Slide28

Hyper-Complex Feature Detector Cells in Higher-Order Species

Movement (Bidirectional)

Slide29

Hyper-Complex Feature Detector Cells in Higher-Order Species

Angle

Slide30

Higher-Level Feature Detector Cells in Higher-Order Species

Slide31

Higher-Level Feature Detector Cells in Higher-Order Species

http://flickr.com/photos/crowolf/205180735/

The Monkey Paw

by John “Jay” Glenn, under CC License

Slide32

Higher-Level Feature Detector Cells in Higher-Order Species

(Lindsay & Norman 1977, p.250)

Slide33

Building Up

Complex Feature Detectors

http://flickr.com/photos/residae/386508456/

Father of the Eye by Desirae, under CC license

Slide34

Slide35

Cognitive Feature Detection

Features and GroupingGeon Theory

Slide36

Features and Objects

Slide37

Physiological Nystagmus Jiggly Eye Movements

http://en.wikipedia.org/wiki/Image:Optokinetic_nystagmus.gif

Available under GNU Free Documentation License,

http://commons.wikimedia.org/wiki/Commons:GNU_Free_Documentation_License

Slide38

Slide39

(

Verheijen

1961 in Lindsay & Norman 1977)

Slide40

Slide41

Physiological Nystagmus Jiggly Eye Movements

(Dodwell 1970, p.188)

Slide42

Physiological Nystagmus Jiggly Eye Movements

(Lindsay & Norman 1977, p.40-44)

Slide43

Segmental Image Loss

(From R.M. Pritchard,

Scientific American, 1961 in Lindsay & Norman 1977)

Slide44

Object Segmentation into Features

Slide45

Feature Classes

Biederman

(1995)

Slide46

Feature Relation

Slide47

Geons

Biederman (1995)

Slide48

Geons to Scenes

Biederman

(1995)

Slide49

Features

Sensory Input

Physiological Features

Simple

ComplexHypercomplexHigher

-Level

Feature Classes + Feature Relations

Object Segments

Objects

Slide50

Pattern Recognition

Pandemonium Revisited

Slide51

Evidence and Consequences of Feature Detection in The Visual Pattern Recognition of Reading by 

Taylor J. Meek

 is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.These original publications may be accessed electronically from: http://www.lingnik.com/visual-pattern-recognition