vision and color perception
play

Vision and Color Perception Lecture 5 January 28, 2020 Slides - PowerPoint PPT Presentation

May 29, 2023 •454 likes •1.26k views

CS530 - Spring 2020 Introduction to Scientific Visualization Vision and Color Perception Lecture 5 January 28, 2020 Slides acknowledgment: P. Rheingans (UMBC) and A. Lex (Utah) Outline Preamble: human vision Physiological basis of

  1. CS530 - Spring 2020 Introduction to Scientific Visualization Vision and Color Perception Lecture 5 January 28, 2020 Slides acknowledgment: P. Rheingans (UMBC) and A. Lex (Utah)

  2. Outline • Preamble: human vision • Physiological basis of color perception • Color vision models • Color spaces 2 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  3. Functions of Human Vision • Shape/size • Depth • Motion • Recognition 3 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  4. Properties of Vision • Accurate relative to other senses • Location, size, and identification at a distance • But… 4 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  5. CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 5

  6. CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 6

  7. CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 7

  8. Perceived Sizes Are Relative CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 8

  9. Perceived Sizes Are Relative CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 9

  10. CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 10

  11. Ames Room 11 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  12. Ponzo Illusion CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 12

  13. Ponzo Illusion CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 13

  14. CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 14

  15. CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 15

  16. �������� Properties of Vision • Limitations • V eridical perception is limited • Absolute judgments are often poor • Lack of quantification CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 16

  17. Properties of Vision • Good at • Relative judgments • Time and space • Identification 17 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  18. Light • Visible range: 390-700nm • Luminance has a large dynamic range • Colors result from spectral curves • dominant wavelength, hue • brightness , lightness • purity, saturation 18 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  19. ������������������ � Light • Visible range: 390-700nm • Luminance has a large dynamic range • Colors result from spectral curves • dominant wavelength, hue • brightness , lightness • purity, saturation 18 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  20. Light • Visible range: 390-700nm • 0.00003 -- Moonless overcast night sky • Luminance has a large dynamic range • 30 -- Sky on overcast day • 3000 -- Sky on clear day • Colors result from spectral curves • 16,000 -- Snowy ground in full sunlight • dominant wavelength, hue • brightness , lightness • purity, saturation 18 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  21. Light • Visible range: 390-700nm • Luminance has a large dynamic range • Colors result from spectral curves • dominant wavelength, hue • brightness , lightness • purity, saturation 18 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  22. Spectral Curve (of incoming radiation) Magnitude/Intensity Visible Wavelength (1/frequency) CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 19

  23. Physiology: Eye CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 20

  24. Perspective Projection and Image Formation Image plane/retina Lens Scene CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 21

  25. ����� ���� Physiology: Photoreceptors • Discrete sensors that measure energy • Adaptation • Rods ~ 120 million • Active at low light levels ( scotopic vision) • Only one wavelength-sensitivity function • Cones ~ 6-7 million • Active at normal light levels ( photoptic ) • Three types: sensitivity functions with different peaks 22 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  26. �������������� Retina CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 23

  27. Cone Sensitivity HyperPhysics, Georgia State University 24 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  28. Rod Sensitivity Function CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 25

  29. ������������������������ ������� CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 26

  30. ����������������������� ������������� Retinotopic Mapping CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 27

  31. Human Gaze •Vision made up of fixations and saccades • Fixation: 200-600 ms • Motion: 20-100 ms 28 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  32. CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 29

  33. Models of Color Vision •Tricolor theory •Opponent process theory 30 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  34. Trichromatic Theory • Three types of cones – each with a characteristic wavelength • Mixture of 3 responses defines color • Explains some psychophysical data • 3D color space (i.e. 3 colors match any perceived) 31 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  35. Trichromatic Theory • Metamers: match of an apparent color with a different spectral distribution (3D basis) • Color blindness (different types) 32 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  36. Trichromatic Theory CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 33

  37. Trichromatic Theory Shortcomings • Color blindness • R-G, B-Y, All • Yellow seems primary • Color constancy 34 CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception

  38. Note: Additive vs. Subtractive Colors Additive Subtractive CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 35

  39. Note: Additive vs. Subtractive Colors Additive coloring: Colors are produced by combining (adding) electromagnetic radiations of different wavelength / frequency. Example: computer screen CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 36

  40. Note: Additive vs. Subtractive Colors Subtractive coloring: Colors are obtained by combining things that absorb different portions of the visual spectrum when they reflect/scatter the incoming light. Subtractive coloring defines the “color” of objects . Additive Example: pigments of paint CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 37

  41. Color Blindness No L cones CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 38

  42. Color Blindness No M cones CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 39

  43. Color Blindness No L cones No M cones CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 40

  44. Color Blindness No L cones No M cones Red/green deficiencies CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 40

  45. Color Blindness No S cones CS530 / Spring 2020 : Introduction to Scientific Visualization. 01/28/2020 05. Vision and Color Perception 41

Recommend

Color Vision Chapter 5 (Lecture 9) Jonathan Pillow Sensation & Perception (PSY 345 / NEU

Color Vision Chapter 5 (Lecture 9) Jonathan Pillow Sensation & Perception (PSY 345 / NEU

Color Vision Chapter 5 (Lecture 9) Jonathan Pillow Sensation & Perception (PSY 345 / NEU 325) Princeton University, Spring 2019 1 2 3 color vision has evolutionary value lack of color vision black & white 4 Basic

766 views • 41 slides
COLOR (or colour) Color Perception Visible color Gamut RGB color Gamut Pantone color Gamut

COLOR (or colour) Color Perception Visible color Gamut RGB color Gamut Pantone color Gamut

COLOR (or colour) Color Perception Visible color Gamut RGB color Gamut Pantone color Gamut CMYK color Gamut The perception of color is very subjective. Color Perception RGB fmow Digital printing small numbers standard sizes

332 views • 18 slides
Chapter 5: Color vision remnants Chapter 6: Depth perception Lec 12 Jonathan Pillow, Sensation

Chapter 5: Color vision remnants Chapter 6: Depth perception Lec 12 Jonathan Pillow, Sensation

Chapter 5: Color vision remnants Chapter 6: Depth perception Lec 12 Jonathan Pillow, Sensation & Perception (PSY 345 / NEU 325) Princeton University, Fall 2017 1 Other types of color-blindness: Monochromat: true

775 views • 48 slides
Color and Icons SWEN-444 Color Topics Color perception Using color in interaction design

Color and Icons SWEN-444 Color Topics Color perception Using color in interaction design

Color and Icons SWEN-444 Color Topics Color perception Using color in interaction design Color concerns for interaction design Color Reference Color Perception - A Physics Review A light source emits light waves at visible

721 views • 33 slides
Color Perception and Applications SIGGRAPH 99 Course: Fundamental Issues of Visual Perception

Color Perception and Applications SIGGRAPH 99 Course: Fundamental Issues of Visual Perception

Color Perception and Applications SIGGRAPH 99 Course: Fundamental Issues of Visual Perception for Effective Image Generation Penny Rheingans University of Maryland Baltimore County Overview Characteristics of Color Perception

693 views • 40 slides
Color Vision Lecture 10 Chapter 5, Part A Jonathan Pillow Sensation & Perception (PSY 345 /

Color Vision Lecture 10 Chapter 5, Part A Jonathan Pillow Sensation & Perception (PSY 345 /

Color Vision Lecture 10 Chapter 5, Part A Jonathan Pillow Sensation & Perception (PSY 345 / NEU 325) Princeton University, Fall 2017 1 Exam #1 : Thursday 10/19 Format : multiple-choice, fill-in-the-blank, & short answer What to

505 views • 48 slides
Color perception SINA 08/09 Color adds another dimension to visual perception

Color perception SINA 08/09 Color adds another dimension to visual perception

Color perception SINA 08/09 Color adds another dimension to visual perception Enhances our visual experience Increase contrast between objects of similar lightness Helps recognizing objects SINA 08/09 However, it

448 views • 44 slides
Color perception SINA 11/12 Color adds another dimension to visual perception

Color perception SINA 11/12 Color adds another dimension to visual perception

Color perception SINA 11/12 Color adds another dimension to visual perception Enhances our visual experience Increase contrast between objects of similar lightness Helps recognizing objects SINA 11/12 However, it

728 views • 47 slides
Color and Color Models Werner Purgathofer Color problem specification light and perception

Color and Color Models Werner Purgathofer Color problem specification light and perception

Einfhrung in Visual Computing 186.822 186.822 Color and Color Models Werner Purgathofer Color problem specification light and perception colorimetry l i t device color systems color ordering systems color symbolism 1 Werner

461 views • 29 slides
2.4 Color images Human color perception adds wavelength of electromagnetic radiation

2.4 Color images Human color perception adds wavelength of electromagnetic radiation

2.4 Color images 45 2.4 Color images Human color perception adds wavelength of electromagnetic radiation subjective layer on top of un- derlying objective physical properties color a psychophysical phenomenon human visual

690 views • 48 slides
Visual Perception and Color CS/BIOEN 4640: Image Processing Basics April 3, 2012 The Human Eye

Visual Perception and Color CS/BIOEN 4640: Image Processing Basics April 3, 2012 The Human Eye

Visual Perception and Color CS/BIOEN 4640: Image Processing Basics April 3, 2012 The Human Eye Source: National Eye Institute, NIH Photoreceptors in the Retina Cones Color vision - three wavelengths (S, M, L) Mostly in fovea Less

428 views • 16 slides
Computer Graphics - Color - Hendrik Lensch Computer Graphics WS07/08 Color Overview

Computer Graphics - Color - Hendrik Lensch Computer Graphics WS07/08 Color Overview

Computer Graphics - Color - Hendrik Lensch Computer Graphics WS07/08 Color Overview Last time The Human Visual System The eye Early vision High-level analysis Color perception Today Gamma Correction

444 views • 41 slides
Outline Achromatic color perception Dimensionality of the Perceptual Space of Stimulus

Outline Achromatic color perception Dimensionality of the Perceptual Space of Stimulus

Color perception Stimuli Fechnerian Scaling Analysis Outline Achromatic color perception Dimensionality of the Perceptual Space of Stimulus configurations Achromatic Colors Fechnerian Scaling Nora Umbach Research Methods and Mathematical

825 views • 14 slides
Color Vision Ebony, and ivoryyyy March 30, 2020 PSYCH 4041 / 6014 Overview Color vision in

Color Vision Ebony, and ivoryyyy March 30, 2020 PSYCH 4041 / 6014 Overview Color vision in

Color Vision Ebony, and ivoryyyy March 30, 2020 PSYCH 4041 / 6014 Overview Color vision in nature Color mixture Effects Theories Defective color vision March 30, 2020 PSYCH 4041 / 6014 Questions Why do we perceive blue dots

504 views • 31 slides
for Predicting Brain Activity Level -in Terms of the Perception of Pain Sensation The

for Predicting Brain Activity Level -in Terms of the Perception of Pain Sensation The

Monitoring and Enhancing Visual Features (movement, color) as a Method for Predicting Brain Activity Level -in Terms of the Perception of Pain Sensation The relationship between perception of pain and its measurement, using computational vision

617 views • 13 slides
Color Constancy Lecture 11 Chapter 5, Part 3 Jonathan Pillow Sensation & Perception (PSY

Color Constancy Lecture 11 Chapter 5, Part 3 Jonathan Pillow Sensation & Perception (PSY

Color Constancy Lecture 11 Chapter 5, Part 3 Jonathan Pillow Sensation & Perception (PSY 345 / NEU 325) Princeton University, Spring 2015 1 Color Constancy The visual system uses a variety of tricks to make sure things look the same

499 views • 46 slides
Welcome! COMP 546 Computational Perception Prof: Michael Langer See public web page for this

Welcome! COMP 546 Computational Perception Prof: Michael Langer See public web page for this

Welcome! COMP 546 Computational Perception Prof: Michael Langer See public web page for this course: http://www.cim.mcgill.ca/~langer/546.html 1 What do you know about visual perception ? - optics (glasses) - color (color blindness) -

691 views • 32 slides
Color SE 444 R.I.T S. Ludi/R. Kuehl p. 1 R I T Software Engineering Color Topics Color

Color SE 444 R.I.T S. Ludi/R. Kuehl p. 1 R I T Software Engineering Color Topics Color

Color SE 444 R.I.T S. Ludi/R. Kuehl p. 1 R I T Software Engineering Color Topics Color perception Using color in interaction design Color concerns for interaction design Color Reference R.I.T S. Ludi/R. Kuehl p. 2 R I T

395 views • 16 slides
CS 4495 Computer Vision 3D Perception Kelsey Hawkins Robotics 3D Perception CS 4495 Computer

CS 4495 Computer Vision 3D Perception Kelsey Hawkins Robotics 3D Perception CS 4495 Computer

3D Perception CS 4495 Computer Vision K. Hawkins CS 4495 Computer Vision 3D Perception Kelsey Hawkins Robotics 3D Perception CS 4495 Computer Vision K. Hawkins Motivation What do animals, people, and robots want to do with vision?

981 views • 56 slides
Human Perception and Memory Semester 2, 2009 1 Vision Human Visual Perception Humans are

Human Perception and Memory Semester 2, 2009 1 Vision Human Visual Perception Humans are

Human Perception and Memory Semester 2, 2009 1 Vision Human Visual Perception Humans are visual creatures. While your eye is like a camera, theres no little guy inside your head watching T.V. Rather, your subjective perception of

502 views • 24 slides
PPM PART I Media and Media formats Images A) COLOR IMAGES A) Color spaces B) Image

PPM PART I Media and Media formats Images A) COLOR IMAGES A) Color spaces B) Image

PPM PART I Media and Media formats Images A) COLOR IMAGES A) Color spaces B) Image Formats B) IMAGE STANDARDS A) JPEG B) JPEG 2000 Color Images: color spaces Color perception Light source Observer (human eye) ( (

354 views • 31 slides
Vision/Color II, Virtual Trackball Week 5, Wed Feb 7 http://www.ugrad.cs.ubc.ca/~cs314/Vjan2007

Vision/Color II, Virtual Trackball Week 5, Wed Feb 7 http://www.ugrad.cs.ubc.ca/~cs314/Vjan2007

University of British Columbia CPSC 314 Computer Graphics Jan-Apr 2007 Tamara Munzner Vision/Color II, Virtual Trackball Week 5, Wed Feb 7 http://www.ugrad.cs.ubc.ca/~cs314/Vjan2007 Reading for Last Time & Today RB Chap Color

642 views • 27 slides
Pons Developed 0-5 months of life Automatic functions In charge of vision: side vision, eye

Pons Developed 0-5 months of life Automatic functions In charge of vision: side vision, eye

Pons Developed 0-5 months of life Automatic functions In charge of vision: side vision, eye tracking, saccadic eye jumps Perception of danger Emotional security, bonding, trust Perception of hunger Heart rate and respiration

951 views • 10 slides
Active Processes in Perception, in Vision and in Electric Fish. Curtis Bell Neurological

Active Processes in Perception, in Vision and in Electric Fish. Curtis Bell Neurological

Active Processes in Perception, in Vision and in Electric Fish. Curtis Bell Neurological Sciences Institute Oregon Health and Science University Three ways in which Perception is an Active Process The organism exerts behavioral control

700 views • 45 slides

More recommend