EE 193 Imaging systems: Speed and time Steven Bell 26 September - - PowerPoint PPT Presentation

▶

Sep 22, 2022 183 likes •388 views

EE 193 Imaging systems: Speed and time Steven Bell 26 September 2018 Lilac chaser http://www.123opticalillusions.com/pages/lilac_chaser.php Afterimages There are two basic sources of afterimages: Bleaching/regeneration (positive

SLIDE 1

EE 193

Steven Bell 26 September 2018

Imaging systems: Speed and time

SLIDE 2

Lilac chaser

http://www.123opticalillusions.com/pages/lilac_chaser.php

SLIDE 3

Afterimages

There are two basic sources of afterimages: Bleaching/regeneration (positive afterimages) Adaptation (negative afterimages)

SLIDE 4

Bleaching afterimages

(A hypothesis by David Jacobs)

Re a dy

Doe snotcontribute to transduction

Ble a che d

Doe scontribute to transduction light light re ge ne ra tion prote in re ge ne ra tion prote in

Cone pigments act as light-dependant catalysts, and have two states

SLIDE 5

catalytic efficiency time

photon strike pigment regenerated ready bleached ready

Bleaching afterimages

(A hypothesis by David Jacobs)

SLIDE 6

Bleaching afterimages

(A hypothesis by David Jacobs)

0s 1s 2s 3s 4s

Stimulus Bleaching Time Stimulus Strength (cd/m2 )

0s 1s 2s 3s 4s

Time 106 107 108 105 104 103 102

SLIDE 7

Adaptation afterimages

Your eyes (and brain) adapt based on a "gray world" assumption This takes a few seconds, and your eyes are usually moving around.

SLIDE 8

SLIDE 9

SLIDE 10

SLIDE 11

SLIDE 12

SLIDE 13

SLIDE 14

SLIDE 15

Flicker fusion

Ranges from 20Hz to 60+ Hz in humans. The illusion of a blinking light appearing constant Used in pretty much everything. Nearly every display is blinking if you look fast enough.

SLIDE 16

5ms exposure

SLIDE 17

1ms exposure

SLIDE 18

https://www.puzzleprime.com/motion-illusions/

SLIDE 19