James A. Ferwerda Sumanta N. Pattanaik Peter Shirley Donald P. Greenberg A Model of Visual Adaptation for Realistic Image Synthesis By Nigel Thomas 10/22/04.

Slides:



Advertisements
Similar presentations
The Eye. Rods and Cones The eye is made of cells that are called Rods and Cones. Cone cells are coned shaped and Rod cells are rod shaped.
Advertisements

VISION. LIGHT Electromagnetic energy described in wavelengths Electromagnetic energy described in wavelengths Main colors of the spectrum: ROYGBIV Main.
Light and dark adaptation The range of light levels over which we can see Why do we need adaptation? The design problem Role of pupil changes The duplex.
We can see objects even though the background luminance levels change over a range of more than 10 orders of magnitude (10 10 ). How do we do it?
Sensation Overview How is perception different from sensation? What is psychophysics? What do sense organs do? How does vision work? How does this compare.
The Human Visual System Short Overview. Terms: LGN, cortex, primary visual cortex, V1.
Applied Perception in Graphics Erik Reinhard University of Central Florida
Ch 31 Sensation & Perception Ch. 3: Vision © Takashi Yamauchi (Dept. of Psychology, Texas A&M University) Main topics –convergence –Inhibition, lateral.
ניורוביולוגיה ומדעי המח Introduction to Neurobiology Introduction to Sensory Systems The retina “From Neuron to Brain” Chapter 19: Transduction.
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Fundamentals of Anatomy & Physiology SIXTH EDITION Frederic H. Martini PowerPoint.
Sensation and Perception - duplicity.ppt © 2001 Dr. Laura Snodgrass, Ph.D.1 Duplicity Theory Two independent visual systems Photopic system – day vision.
Major transformations of the light signal in the retina: 1.Temporal filtering – visual response slower than input signal. 2. Spatial filtering – local.
How many different shades can the average person with normal vision distinguish?
Evaluation of a Scanned Laser Display as an Alternative Low Vision Computer Interface Conor Kleweno, Eric Seibel, Ph.D., Kyle Kloeckner, Bob Burstein,
Visual Perception Kit Carolina $
Sensation and Perception
 PSYC 1020 Sensing and Perceiving I Sense Modalities Psychophysics Light, Eye & Brain Internet : http: // Dr. Jack Broerse.
صدق الله العظيم الاسراء اية 58. By Dr. Abdel Aziz M. Hussein Lecturer of Physiology Member of American Society of Physiology.
 Objective: Students will explain the difference between sensation & perception, identify some of the key terms for sensation, and explain how the eye.
Presented by: Sarah Wong Orthoptist II Orthoptic Unit QA 2011.
The Aging Visual System. There are normal age-related changes in the eye and visual system Decreased pupil size (miosis) – decreases illuminance but increases.
Light Compare and contrast photopic and scotopic vision.
Computer Vision – Fundamentals of Human Vision Hanyang University Jong-Il Park.
Physiology of the Eye. 1. Refraction The bending of light as it travels from less dense medium into a more dense medium.
Structure of the Human Eye Cornea protects eye refracts light Iris colored muscle regulates pupil size Pupil regulates light input Lens focuses images.
© by Yu Hen Hu 1 Human Visual System. © by Yu Hen Hu 2 Understanding HVS, Why? l Image is to be SEEN! l Perceptual Based Image Processing.
Vision Those of us fortunate enough to have good vision usually consider information from vision to be more essential than our other senses, no other.
2) Vision The Special Senses 13 th edition Chapter 17 Pages th edition Chapter 17 Pages
Vision [Class Section Number] [Instructor Name]. Overview What is Vision? Contrast is Key Sensitivity to Light Reconstruction Color Integration.
Color in Visual Design CS 4390/5390 Data Visualization Shirley Moore, Instructor September 10, 2014.
What you will learn today... Vision is a complicated process, and we can use several tests to measure the proper function.
The Visual System Part 2. The Retina Photoreceptor cells 4 light sensitive proteins: rods with 1 type 3 types of cones, each with a single type Receptors.
03/05/03© 2003 University of Wisconsin Last Time Tone Reproduction If you don’t use perceptual info, some people call it contrast reduction.
Vision is interpretative. The pathway for visual perception.
What is your nervous system? YOUR VISUAL SYSTEM.
Weber Fractions Decibel Scale Of Sound Energy.
Visual Acuity Adler’s Physiology of the Eye 11th Ed. Chapter 33 - by Dennis Levi
DECREASED FLICKER SENSITIVITY WITH A SCANNED LASER DISPLAY. J.P. Kelly 1, H.L. Pryor, E.S. Viirre, T. Furness III. 1 Children's Hospital & Medical Center;
G52IIP, School of Computer Science, University of Nottingham 1 Summary of Topic 2 Human visual system Cones Photopic or bright-light vision Highly sensitive.
1 Perception and VR MONT 104S, Fall 2008 Lecture 4 Lightness, Brightness and Edges.
Vision.
Virtual Retinal Display (VRD) Emulator Test System H.L. Pryor, B. Burstein, J. Kollin, E.S. Viirre, E. Seibel, J.P. Kelly, T. Furness III. Human Interface.
Sensation Intro. to Psychology PSY-101 Instructor: Miss Samia Khanum.
03/04/05© 2005 University of Wisconsin Last Time Tone Reproduction –Histogram method –LCIS and improved filter-based methods.
The retina on the back of your eye is covered with nerve cells, rods and cones. The rods detect light intensity (brightness) while the cones detect colors.
The process by which the sensitivity to a certain stimulus is modified by previous exposure is called sensory __________. A) transduction B) adaptation.
Raquel Bujans DKL Color Model Research advisor Dr. Cindy Grimm.
Our Senses Chapter 8.2. It is TRUE that when you look at a rainbow, the wavelength of light determines the colors you see –Red wavelength is longer than.
Human Visual System.
Fundamentals of Sensation and Perception LIGHT AND THE EYES ERIK CHEVRIER NOVEMBER 9, 2015.
Retina Retina covered with light sensitive receptors –RODS Primarily for night vision and movement Sensitive to broad spectrum of light.
Motion-JPEG2000 Video Transmission Over Active Network Ruibiao Qiu.
© 2011 South-Western | Cengage Learning A Discovery Experience PSYCHOLOGY Chapter 4Slide 1 LESSON 4.2 Vision OBJECTIVES Identify and illustrate the structures.
Label the Eye – use book pg. 618 Structure & Function: use book pgs Cornea: clear tissue that covers front of eye. Pupil: opening through.
Photoreceptors Rods “Blue” Cones “Yellow” Cones –“Green” –“Red”
The Eye. The Pupil  A small adjustable opening.  Its size and the amount of light entering the eye is regulated by the iris.
The Visual System.
Human Visual System.
GI is slow Global illumination is important but slow. So people use fast approximations, … Effects of Global Illumination Approximations on Material Appearance.
The “Other” Side of Physics
The Visual System Part 2.
Graphics and Human Perception
The Eye as a Camera Michael A. Sandberg, Ph.D.
Vision Chapter 4 Section 2.
The Eye
Dr Sanjay Manohar University of Cambridge
VISION Retina: light-sensitive inner surface of the eye that contains the rods, cones and neurons that process visual stimuli Photoreceptors: neurons.
Task 1 Discriminate between sensation and perception.
Introduction & Motivation
Lecture 4. Human Factors : Psychological and Cognitive Issues (II)
Presentation transcript:

James A. Ferwerda Sumanta N. Pattanaik Peter Shirley Donald P. Greenberg A Model of Visual Adaptation for Realistic Image Synthesis By Nigel Thomas 10/22/04

Nigel Thomas Washington University in St. Louis Media & Machines Lab 2 Overview Introduction Physiological foundations of adaptation A psychophysical model of adaptation Implementation Results Conclusion / Future Work

Nigel Thomas Washington University in St. Louis Media & Machines Lab 3 Introduction Human eye

Nigel Thomas Washington University in St. Louis Media & Machines Lab 4 Introduction Luminance in natural environments

Nigel Thomas Washington University in St. Louis Media & Machines Lab 5 Physiological foundation of adaptation The pupil The rod and cone systems Bleaching and regeneration of photopigments Neural processes

Nigel Thomas Washington University in St. Louis Media & Machines Lab 6 A psychophysical model of adaptation Threshold studies

Nigel Thomas Washington University in St. Louis Media & Machines Lab 7 A psychophysical model of adaptation Changes in color appearance

Nigel Thomas Washington University in St. Louis Media & Machines Lab 8 A psychophysical model of adaptation Changes in color appearance

Nigel Thomas Washington University in St. Louis Media & Machines Lab 9 A psychophysical model of adaptation Measuring visual acuity  Snellen Acuity Chart

Nigel Thomas Washington University in St. Louis Media & Machines Lab 10 A psychophysical model of adaptation Measuring visual acuity

Nigel Thomas Washington University in St. Louis Media & Machines Lab 11 A psychophysical model of adaptation The time-course of light adaptation - Rods

Nigel Thomas Washington University in St. Louis Media & Machines Lab 12 A psychophysical model of adaptation The time-course of light adaptation - Cones

Nigel Thomas Washington University in St. Louis Media & Machines Lab 13 A psychophysical model of adaptation The time-course of dark adaptation

Nigel Thomas Washington University in St. Louis Media & Machines Lab 14 Implementation Acuity Light Adaptation Dark Adaptation

Nigel Thomas Washington University in St. Louis Media & Machines Lab 15 Results Visual function across the range of light

Nigel Thomas Washington University in St. Louis Media & Machines Lab 16 Results Image sequence showing the time-course of light adaptation Image sequence showing the time-course of dark adaptation

Nigel Thomas Washington University in St. Louis Media & Machines Lab 17 Conclusion / Future Work Computational model of the changes in the visual function that are produced by adaptation. A more complete model of adaptation will result in advances in realistic image synthesis

Nigel Thomas Washington University in St. Louis Media & Machines Lab 18 Questions? ?

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.