high dynamic images between devices and vision limits
DESCRIPTION
Alessandro Rizzi, University of Milan, lecture at Media Integration and Communication Center 10/06/2011TRANSCRIPT
![Page 1: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/1.jpg)
Le immagini ad alta dinamica tra i limiti dei dispositivi e quelli
della visioneAlessandro Rizzi
Dipartimento di Informatica e ComunicazioneUniversità degli Studi di Milano
Friday, June 10, 2011
![Page 2: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/2.jpg)
Outline
HDR imaging
HDR in practice: measuring the limits
Using HDR
Friday, June 10, 2011
![Page 3: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/3.jpg)
The dynamic range
Friday, June 10, 2011
![Page 4: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/4.jpg)
Friday, June 10, 2011
![Page 5: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/5.jpg)
Define HDR ?
do we need a threshold number ?
Friday, June 10, 2011
![Page 6: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/6.jpg)
Define HDR ?
do we need a threshold number ?
NO
Friday, June 10, 2011
![Page 7: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/7.jpg)
Define HDR
A rendition of a scene with greater dynamic range than
the reproduction media
Friday, June 10, 2011
![Page 8: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/8.jpg)
That is ?
Friday, June 10, 2011
![Page 9: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/9.jpg)
Friday, June 10, 2011
![Page 10: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/10.jpg)
Annibale Carracci (1560-‐1609) PaesaggioFriday, June 10, 2011
![Page 11: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/11.jpg)
Photo: C. OleariFriday, June 10, 2011
![Page 12: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/12.jpg)
Photo: C. OleariFriday, June 10, 2011
![Page 13: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/13.jpg)
Annibale Carracci (1560-‐1609) PaesaggioFriday, June 10, 2011
![Page 14: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/14.jpg)
Source/lamp Average Luminance cd/m2
Xenon short arc 200 000 ÷ 5 000 000 000Sun 1 600 000 000Metal halide 10 000 000 ÷ 60 000 000Incandescent 20 000 000 ÷ 26 000 000compact Fluorescent 20 000 ÷ 70 000Fluorescent 5 000 ÷ 30 000Sunlit clouds 10 000Candle 7 500blue sky 5 000Preferred values for indoor lighIng
50 ÷ 500
White paper at sun 10 000White paper at 500 lx 100White paper at 5 lx 1
Courtesy: C. Oleari
Light levels
Friday, June 10, 2011
![Page 15: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/15.jpg)
Dynamic ranges
Friday, June 10, 2011
![Page 16: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/16.jpg)
Dynamic ranges
?Friday, June 10, 2011
![Page 17: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/17.jpg)
Range limits and quantization: the ‘salame’ metaphor
Friday, June 10, 2011
![Page 18: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/18.jpg)
Friday, June 10, 2011
![Page 19: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/19.jpg)
Range compression from incorrect pixel perspective
Friday, June 10, 2011
![Page 20: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/20.jpg)
Range compression from incorrect pixel perspective
Friday, June 10, 2011
![Page 21: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/21.jpg)
Range compression from incorrect pixel perspective
Very wide range obtained with isolated stimuliimpossible to obtain in an image
Friday, June 10, 2011
![Page 22: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/22.jpg)
The “salame” metaphor
Dynamic range Quantization
Friday, June 10, 2011
![Page 23: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/23.jpg)
The “salame” metaphor
Dynamic range Quantization
More bits do not mean wider rangeLess bits do not mean shorter range
Friday, June 10, 2011
![Page 24: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/24.jpg)
SceneDR
SensorDR
16 bit
28=2562-3 log unit
216=65536 4-5 log unit
8 bit
Friday, June 10, 2011
![Page 25: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/25.jpg)
SceneDR
SensorDR
16 bit
28=2562-3 log unit
216=65536 4-5 log unit
8 bit
NO
Friday, June 10, 2011
![Page 26: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/26.jpg)
SceneDR
SensorDR
8 bit
2-3 log unit
4-5 log unit
8 bit
SceneDR
SensorDR
16 bit
16 bit
Friday, June 10, 2011
![Page 27: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/27.jpg)
SceneDR
SensorDR
8 bit 16 bit
SceneDR
SensorDR
Friday, June 10, 2011
![Page 28: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/28.jpg)
SceneDR
SensorDR
8 bit 16 bit
SceneDR
SensorDR
Friday, June 10, 2011
![Page 29: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/29.jpg)
The HDR idea
http://www.adolfo.trinca.name/public/2010/11/ahdrdiagram.jpg
Friday, June 10, 2011
![Page 30: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/30.jpg)
The HDR ideaHow ?
general solution ?rendering intent ?
http://www.adolfo.trinca.name/public/2010/11/ahdrdiagram.jpg
Friday, June 10, 2011
![Page 31: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/31.jpg)
http://www.digitalcameratracker.com/how-to-create-high-definition-range-hdr-photos/
Friday, June 10, 2011
![Page 32: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/32.jpg)
Two sides of the coin
• Objective data: recording/displaying physical light colorimetric distribution
• Subjective data: reproducing appearance (or different rendering intent)
Friday, June 10, 2011
![Page 33: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/33.jpg)
Mapping the world: the characteristic curve
Friday, June 10, 2011
![Page 34: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/34.jpg)
H & D curve
Friday, June 10, 2011
![Page 35: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/35.jpg)
H & D curve
Friday, June 10, 2011
![Page 36: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/36.jpg)
H & D curve
Friday, June 10, 2011
![Page 37: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/37.jpg)
H & D curve
Friday, June 10, 2011
![Page 38: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/38.jpg)
http://www.dpreview.com/reviews/olympuse3/page21.asp
Olympus E-3
Friday, June 10, 2011
![Page 39: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/39.jpg)
Exposure problem
Friday, June 10, 2011
![Page 40: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/40.jpg)
Friday, June 10, 2011
![Page 41: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/41.jpg)
Friday, June 10, 2011
![Page 42: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/42.jpg)
History of HDR imaging
Friday, June 10, 2011
![Page 43: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/43.jpg)
HDR 1858H.P. Robinson “Fading Away
Friday, June 10, 2011
![Page 44: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/44.jpg)
Mees (1920) 2 negative print
“The Fundamentals of Photography”
Friday, June 10, 2011
![Page 45: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/45.jpg)
Ansel Adams
Friday, June 10, 2011
![Page 46: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/46.jpg)
ISCC 11/05-McCann
Ansel Adams - Zone System
Friday, June 10, 2011
![Page 47: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/47.jpg)
Jones and Condit, 1941Measurements of dynamic range of real scenes
0.0 3.01.5log range
REFLECTANCE RANGE OF PRINTS
Maximum
Average of 126 outdoor scenes
Minimum
SCENE RANGE OF WORLD
Friday, June 10, 2011
![Page 48: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/48.jpg)
L.A.Jones & H.R.Condit, JOSA,1941
Friday, June 10, 2011
![Page 49: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/49.jpg)
Retinex starting idea
Green record
5588
ratio = 0.62
146
ratio = 0.62
230
digit ~ luminance 119 119
Ratios are constant in sun and shadeFriday, June 10, 2011
![Page 50: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/50.jpg)
1980Friday, June 10, 2011
![Page 51: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/51.jpg)
Retinex cameraFriday, June 10, 2011
![Page 52: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/52.jpg)
Capturing and reproducing the scene
Friday, June 10, 2011
![Page 53: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/53.jpg)
Friday, June 10, 2011
![Page 54: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/54.jpg)
Sensors dynamic range
Limited !
Friday, June 10, 2011
![Page 55: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/55.jpg)
Is HDR a technological problem ?
Friday, June 10, 2011
![Page 56: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/56.jpg)
Expanding sensors dynamic range• Sensors that compress their response to light due to their
logarithmic transfer function;• Multimode sensors that have a linear and a logarithmic
response at dark and bright illumination levels, (switches between linear and logarithmic modes of operation);
• Sensors with a capacity well adjustment method;• Frequency-based sensors, sensor output is converted into
pulse frequency; • Time-to-saturation [(TTS); time-to-first spike] sensors,
signal is the time the to saturated pixel; • Sensors with global control over the integration time; • Sensors with autonomous control over the integration time,
where each pixel has control over its own exposure.Spivak A, Belenky A, Fish A & Yadid-Pecht O (2009) Wide dynamic-range CMOS image sensors:
A comparative performance analysis, IEEE Trans. on Electron Devices, 56, 2446-2461.Friday, June 10, 2011
![Page 57: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/57.jpg)
Friday, June 10, 2011
![Page 58: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/58.jpg)
Friday, June 10, 2011
![Page 59: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/59.jpg)
The HDR idea
http://www.adolfo.trinca.name/public/2010/11/ahdrdiagram.jpg
Friday, June 10, 2011
![Page 60: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/60.jpg)
The HDR ideaHow ?
http://www.adolfo.trinca.name/public/2010/11/ahdrdiagram.jpg
Friday, June 10, 2011
![Page 61: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/61.jpg)
Multiple image acquisition
Friday, June 10, 2011
![Page 62: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/62.jpg)
•Multiple Exposures
•Use Multiple Times
•Recover scene radiances at all pixelsfrom camera digits
€
CameraDigit = radiance* time( )
New goal: Accurately measure radiances
Friday, June 10, 2011
![Page 63: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/63.jpg)
Multiple Exposures
Flux = Luminance * time
Scene Luminance = Flux / time
Scene Luminance = Camera Digit / time
Friday, June 10, 2011
![Page 64: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/64.jpg)
Multiple Exposures
One Spot (ScaleD)
0
50
100
150
200
250
0.0001 0.0010 0.0100 0.1000 1.0000 10.0000 100.0000 1000.0000Exposure Flux [(cd/m2) * sec]
Cam
era
Dig
it
1/8 sec1/4 sec1/2 sec1 sec2 sec4 sec8 sec16 sec32 sec64 secFIT
Flux = Luminance * time
Camera Digit
Friday, June 10, 2011
![Page 65: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/65.jpg)
HDR file formats
Source: Reinhard et al., High Dynamic Range Imaging: Acquisition, Display, and Image-Based Lighting (The Morgan Kaufmann Series in Computer Graphics)
Friday, June 10, 2011
![Page 66: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/66.jpg)
HDR file formats
Source: Reinhard et al., High Dynamic Range Imaging: Acquisition, Display, and Image-Based Lighting (The Morgan Kaufmann Series in Computer Graphics)
Friday, June 10, 2011
![Page 67: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/67.jpg)
Acquisition limits
Friday, June 10, 2011
![Page 68: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/68.jpg)
Friday, June 10, 2011
![Page 69: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/69.jpg)
The glare problem
Friday, June 10, 2011
![Page 70: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/70.jpg)
The glare problem
Friday, June 10, 2011
![Page 71: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/71.jpg)
Friday, June 10, 2011
![Page 72: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/72.jpg)
Effect of illumination
Assumes 0.0 glare
1.0 refl * 1.0 illum = 1.0 cd/m2
0.2 refl *0.01 illum = 0.002 cd/m2
Friday, June 10, 2011
![Page 73: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/73.jpg)
Glare is image dependent
Assumes 0.001 glare
1.0 refl * 1.0 illum = 1.0 cd/m2
0.2 refl *0.01 illum = 0.002 cd/m2
0.002 cd/m2 *0.001 = 0.000002
1.0 cd/m2 *0.001 = 0.001
0.001
0.001
Friday, June 10, 2011
![Page 74: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/74.jpg)
Ratio Signal/Glare
Assumes 0.001 glare
1.0 cd/m2)/(0.000002) = 5*10^5
( 0.002 cd/m2)) / (0.001) = 2
Friday, June 10, 2011
![Page 75: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/75.jpg)
Sowerby, “Dictionary of Photography”, 1956
Friday, June 10, 2011
![Page 76: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/76.jpg)
Parasitic Images
Friday, June 10, 2011
![Page 77: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/77.jpg)
Camera limits•Glare•Unwanted scattered light in camera
•air - glass reflections •lens (number of elements)•aperture •angle off optical axis
•camera wall reflections•sensor surface reflections
•We must measure actual veiling glare limit
Friday, June 10, 2011
![Page 78: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/78.jpg)
Measuring overall camera glare
Friday, June 10, 2011
![Page 79: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/79.jpg)
Friday, June 10, 2011
![Page 80: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/80.jpg)
HDR Test Setup
Friday, June 10, 2011
![Page 81: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/81.jpg)
Text
Synthetic HDR(High-Dynamic Range)
Images
18,619:1
digit 255 = 2094.2 cd/m2
= 18,619
digit 0 = 0.11 cd/m2
2094.2 cd/m2
0.11 cd/m2
Goal Image
Friday, June 10, 2011
![Page 82: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/82.jpg)
Targets
18,619:1
20:1
Friday, June 10, 2011
![Page 83: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/83.jpg)
16 sec exposure - Target 1scaleBlackFriday, June 10, 2011
![Page 84: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/84.jpg)
16 sec exposure - Target 4scaleBlackFriday, June 10, 2011
![Page 85: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/85.jpg)
16 sec exposure - Target 4scaleBlackFriday, June 10, 2011
![Page 86: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/86.jpg)
16 sec exposure
TextTarget 1B
Target 4B
Target 4W
Text
Friday, June 10, 2011
![Page 87: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/87.jpg)
Constant Luminance - Variable SurroundFriday, June 10, 2011
![Page 88: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/88.jpg)
Minimum Glare
Friday, June 10, 2011
![Page 89: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/89.jpg)
Mild Glare
Friday, June 10, 2011
![Page 90: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/90.jpg)
Maximum Glare
Friday, June 10, 2011
![Page 91: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/91.jpg)
Friday, June 10, 2011
![Page 92: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/92.jpg)
Friday, June 10, 2011
![Page 93: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/93.jpg)
Measure In-camera Accuracy
SceneScene
Dynamic Range
In-cameraAccurate
Range
MaximumError
(% radiance)
1scaleB 20:1 20:1 0
4scaleB 18,619:1 3,000:1 300% Min
4scaleW 18,619:1 100:1 10,000% Max
4.3 log10 scene ----> 3.0 log10 image
1
Friday, June 10, 2011
![Page 94: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/94.jpg)
Side Dupe FilmFriday, June 10, 2011
![Page 95: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/95.jpg)
Slide Dupe FilmFriday, June 10, 2011
![Page 96: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/96.jpg)
One Negative Capture4scale Black - Single Negative
1.50
1.70
1.90
2.10
2.30
2.50
-1.00 -0.50 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50Log Cd/m2
Log
dig
it
3.5 Log10 units
Friday, June 10, 2011
![Page 97: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/97.jpg)
Dynamic Range (OD)Friday, June 10, 2011
![Page 98: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/98.jpg)
HDR from cameras
• Range of usable captured information
• Range of accurate luminance information
(much smaller)
• Scene dependent
Friday, June 10, 2011
![Page 99: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/99.jpg)
Courtesy: M. Fairchild
Friday, June 10, 2011
![Page 100: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/100.jpg)
Glare insertion
Gregory Ward Larson, Holly Rushmeier, and Christine Piatko, “A Visibility Matching Tone Reproduction Operator for High Dynamic Range Scenes”, IEEE Trans on VISUALIZATION AND COMPUTER GRAPHICS, VOL. 3, NO. 4, oct-dec 1997
Friday, June 10, 2011
![Page 101: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/101.jpg)
Display: measuring the human limits
Friday, June 10, 2011
![Page 102: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/102.jpg)
Friday, June 10, 2011
![Page 103: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/103.jpg)
Magnitude estimates (100-1)Friday, June 10, 2011
![Page 104: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/104.jpg)
•Luminance does not correlate uniquely with appearance
•No global tone scale can render the appearance
Friday, June 10, 2011
![Page 105: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/105.jpg)
Magnitude Estimation of AppearanceChange Surrounds
0102030405060708090
100
0.10 1.00 10.00 100.00 1000.00 10000.00Log Luminance (cd/m2)
Mag
nit
ud
e Es
tim
atio
n
Min [0 cd/m2] Max [2094 cd/m2]
Friday, June 10, 2011
![Page 106: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/106.jpg)
We need a new range target
•White surround•adds glare•changes surround
(simultaneous contrast)
•Vary dynamic range with•constant glare•contrast surround
Friday, June 10, 2011
![Page 107: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/107.jpg)
Center/Surround Basic Unit
Fixed contrast surround 88%
Gray test areas 12%(small differences)
Friday, June 10, 2011
![Page 108: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/108.jpg)
90o rotation
Friday, June 10, 2011
![Page 109: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/109.jpg)
Friday, June 10, 2011
![Page 110: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/110.jpg)
Testing different glares% of white surround
100%
50%0%
Friday, June 10, 2011
![Page 111: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/111.jpg)
Single =
Double =(superimposed)
5.4 log10 range
2.7 log10 range
Single & Double Density Transparencies
Friday, June 10, 2011
![Page 112: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/112.jpg)
5.4 & 2.7 log10 Ranges Constant Glare & Surround
Friday, June 10, 2011
![Page 113: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/113.jpg)
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
0123456relative optical density
mag
nitu
de e
stim
atio
n
50% Single Density
50% whitesurround
White[100] = 0.0 rOD - Black [1] = 2.89 rOD
Friday, June 10, 2011
![Page 114: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/114.jpg)
0
10
20
30
40
50
60
70
80
90
100
0123456relative optical density
mag
nitu
de e
stim
atio
n
50% Double Density 50% Single Density
50% whitesurround
2.3 log10 units
Friday, June 10, 2011
![Page 115: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/115.jpg)
0
10
20
30
40
50
60
70
80
90
100
0123456relative optical density
mag
nitu
de e
stim
atio
n
White Double Density White Single Density
2.0 log10 units
100% whitesurround
Friday, June 10, 2011
![Page 116: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/116.jpg)
0
10
20
30
40
50
60
70
80
90
100
0123456relative optical density
mag
nitu
de e
stim
atio
n
Black Double Density Black Single Density
0% whitesurround
5.0 log10 units
Friday, June 10, 2011
![Page 117: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/117.jpg)
0
10
20
30
40
50
60
70
80
90
100
0123456relative optical density
mag
nitu
de e
stim
atio
n
Black Double Density Black Single Density
0% whitesurround
5.0 log10 units
Over 20 not big improvement
Friday, June 10, 2011
![Page 118: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/118.jpg)
Measurements of apparent range
(depends on area of white)
•100% = 2.0 log10 units
• 50% = 2.3 log10 units
• 8% = 2.9 log10 units
Friday, June 10, 2011
![Page 119: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/119.jpg)
DD DD DD DDFriday, June 10, 2011
![Page 120: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/120.jpg)
Test summary
•Double transmission contrast
•Double dynamic range
•very small change in appearance range
•Visual limit ~ area of white surround
•area of white controls glare
Friday, June 10, 2011
![Page 121: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/121.jpg)
What is on the retina: calculated retinal luminance
Friday, June 10, 2011
![Page 122: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/122.jpg)
Friday, June 10, 2011
![Page 123: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/123.jpg)
What comes to the retina is different from the image
High glare Low glare
Friday, June 10, 2011
![Page 124: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/124.jpg)
Glare vs. Contrast
Veiling glare increases gray luminance
Contrast decreases gray appearance
Contrast offsets glare
Friday, June 10, 2011
![Page 125: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/125.jpg)
Discussion
• Glare lowers the physical contrast • Spatial comparisons increase the
contrast of appearance.
• The two act in opposition. • Change with distance are different and
the cancellation is far from exact.
Friday, June 10, 2011
![Page 126: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/126.jpg)
1 Vos, J.J. and van den Berg, T.J.T.P, CIE Research note 135/1, “Disability Glare”, ISBN 3900734976 (1999).
PIGMENTBlue eyed Caucasian 1.21Blue green Caucasian 1.02Mean over all Caucasian 1.00Brown eyed Caucasian 0.50Non Caucasian with pigmented skin and dark brown eyes 0.00
Glare Spread Function
Friday, June 10, 2011
![Page 127: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/127.jpg)
Glare Spread Function
Plotted in log scale
Friday, June 10, 2011
![Page 128: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/128.jpg)
False-color LookUpTable (LUT)
Dynamic Range = 5.4 ODor 251,189:1
Friday, June 10, 2011
![Page 129: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/129.jpg)
Visualize HDR targets
Same LUT applied to SD & DD
Friday, June 10, 2011
![Page 130: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/130.jpg)
Retinal image
Friday, June 10, 2011
![Page 131: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/131.jpg)
Same LUT applied to SD & DD
Visualize Retinal ImagesFriday, June 10, 2011
![Page 132: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/132.jpg)
Same LUT applied to SD & DD
Change LUT for Retinal ImagesFriday, June 10, 2011
![Page 133: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/133.jpg)
Change LUT for Retinal ImagesFriday, June 10, 2011
![Page 134: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/134.jpg)
Two scene-dependent spatial mechanisms:glare and contrast
Glare masks the strength of spatial contrast
Scene Retina Appearance 1,000,000:1 100:1 1,000:1
SpatialGlare
SpatialContrast
Friday, June 10, 2011
![Page 135: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/135.jpg)
Ranges
Friday, June 10, 2011
![Page 136: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/136.jpg)
Tone-rendering problem and spatial comparisons
Friday, June 10, 2011
![Page 137: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/137.jpg)
Friday, June 10, 2011
![Page 138: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/138.jpg)
Choosing a rendering intent
Friday, June 10, 2011
![Page 139: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/139.jpg)
124
Friday, June 10, 2011
![Page 140: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/140.jpg)
124
Friday, June 10, 2011
![Page 141: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/141.jpg)
Friday, June 10, 2011
![Page 142: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/142.jpg)
Friday, June 10, 2011
![Page 143: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/143.jpg)
Friday, June 10, 2011
![Page 144: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/144.jpg)
Land experiment
Friday, June 10, 2011
![Page 145: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/145.jpg)
Land experiment
Friday, June 10, 2011
![Page 146: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/146.jpg)
Land experiment
Projector
Friday, June 10, 2011
![Page 147: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/147.jpg)
Land experiment
Projector
Friday, June 10, 2011
![Page 148: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/148.jpg)
Land experiment
Projector
ES=100 EL=100EM=100
Friday, June 10, 2011
![Page 149: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/149.jpg)
Land experiment
Projector Colorimeter
ES=100 EL=100EM=100
Friday, June 10, 2011
![Page 150: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/150.jpg)
Land experiment
LS=255 LL=255LM=115
Projector Colorimeter
ES=100 EL=100EM=100
Friday, June 10, 2011
![Page 151: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/151.jpg)
Land experiment
LS=255 LL=255LM=115
Projector Colorimeter
ES=100 EL=100EM=100
Observer
Friday, June 10, 2011
![Page 152: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/152.jpg)
Land experiment
LS=255 LL=255LM=115
Projector Colorimeter
ES=100 EL=100EM=100
Observer
PINK
Friday, June 10, 2011
![Page 153: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/153.jpg)
Projector Colorimeter
Observer
Land experiment
Friday, June 10, 2011
![Page 154: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/154.jpg)
Projector Colorimeter
ES=50 EL=50EM=111
Observer
Land experiment
Friday, June 10, 2011
![Page 155: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/155.jpg)
Projector Colorimeter
ES=50 EL=50EM=111
Observer
LS=128 LL=128LM=128
Land experiment
Friday, June 10, 2011
![Page 156: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/156.jpg)
PINK
Projector Colorimeter
ES=50 EL=50EM=111
Observer
LS=128 LL=128LM=128
Land experiment
Friday, June 10, 2011
![Page 157: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/157.jpg)
PINKGRAY
Projector Colorimeter
ES=50 EL=50EM=111
Observer
LS=128 LL=128LM=128
Land experiment
Friday, June 10, 2011
![Page 158: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/158.jpg)
visual sensation
Friday, June 10, 2011
![Page 159: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/159.jpg)
HVS: local compression of range
Friday, June 10, 2011
![Page 160: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/160.jpg)
HVS: local compression of range
Friday, June 10, 2011
![Page 161: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/161.jpg)
Tone mapping vs Tone rendering
No tone mapping operator (global) can mimic vision
We need an image dependent tone renderer operator (local)
Friday, June 10, 2011
![Page 162: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/162.jpg)
Black and White Mondrian
Friday, June 10, 2011
![Page 163: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/163.jpg)
HP 945 Images without “Frames of Reference”Friday, June 10, 2011
![Page 164: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/164.jpg)
Some examples
Friday, June 10, 2011
![Page 165: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/165.jpg)
Friday, June 10, 2011
![Page 166: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/166.jpg)
Bob Sobol, HP
R. Sobol, “ Improving the Retinex algorithm for rendering
wide dynamic range photographs”, in Human Vision and Electronic
Imaging VII, B. E. Rogowitz and T. N. Pappas, ed., Proc. SPIE 4662-41, 341-348,
2002.
Friday, June 10, 2011
![Page 167: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/167.jpg)
Friday, June 10, 2011
![Page 168: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/168.jpg)
Original ACEOriginal ACE
ACE
Friday, June 10, 2011
![Page 169: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/169.jpg)
STRESS Tone Rendering
Friday, June 10, 2011
![Page 170: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/170.jpg)
Judging the results
Friday, June 10, 2011
![Page 171: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/171.jpg)
Beauty contest
C. Gatta, A. Rizzi, D. Marini, “Perceptually inspired HDR images tone mapping with color correction”, Journal of Imaging Systems and Technology, Volume 17 Issue 5, pp. 285-294 (2007).
Friday, June 10, 2011
![Page 172: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/172.jpg)
HDR is in the middle
Imagein CPUmemory
Scene DisplaySpatialImagein CPU
SpatialAlgorithm
GlareSensor
Pre-LUT
Post-LUTgraphics
card
Friday, June 10, 2011
![Page 173: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/173.jpg)
Summary
Friday, June 10, 2011
![Page 174: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/174.jpg)
• To understand HDR we need a new perspective!
1. Veiling glare limits the range on the retina 2. Neural processing (spatial) determines appearance 3. Neural is stronger than it appears [neural cancels glare] 4. General Solution requires spatial process [mimic vision] 5. Tone-Scale is limited, we need Tone-rendering [scene dependent]
Friday, June 10, 2011
![Page 175: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/175.jpg)
Take home points
• HDR limits are not (only) technological
• Glare limits both acquisition and vision
• Glare is scene dependent
• Human vision use spatial comparison to overcome this limit
• Tone renderer operator can use the same approach
Friday, June 10, 2011
![Page 176: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/176.jpg)
Take home points
HDR works very well
• because preserves image information
• not because are more accurate (not possible)
Friday, June 10, 2011
![Page 177: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/177.jpg)
References• J. J. McCann, A. Rizzi, “Camera and visual veiling glare in HDR images”
Journal of the Society for Information Display 15/9, 721–730 (2007).
• J. J. McCann, “Art, Science and Appearance in HDR” Journal of the Society for Information Display 15/9, 709–719 (2007).
• A. Rizzi, J. J. McCann, “Glare-limited Appearances in HDR Images”, Journal of the Society for Information Display, 17/1, pp. 3-12, (2009).
• J. J. McCann, A. Rizzi, “Retinal HDR Images: Intraocular Glare and Object Size” Journal of the Society for Information Display, 17/11, pp. 913-920, (2009).
Friday, June 10, 2011
![Page 178: High dynamic images between devices and vision limits](https://reader037.vdocuments.site/reader037/viewer/2022110307/555c1991d8b42ad77e8b560d/html5/thumbnails/178.jpg)
The art and science of HDR imagingJ.J. McCann, A. Rizzi
(expected publication date autumn 2011)
Friday, June 10, 2011