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![Page 1: Lecture outline Basics Spectral image Spectral imaging systems Applications Summary Lecture material by: Markku Hauta-Kasari, Kanae Miyazawa, Jussi Parkkinen,](https://reader033.fdocuments.in/reader033/viewer/2022052603/56649de45503460f94adabd1/html5/thumbnails/1.jpg)
Jan 02/tj
Lecture outline
• Basics
• Spectral image
• Spectral imaging systems
• Applications
• Summary
Lecture material by: Markku Hauta-Kasari, Kanae Miyazawa, Jussi Parkkinen,Timo Jääskeläinen, Jouni Hiltunen, Joni Orava, Hannu Laamanen, Jarkko Mutanen
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Jan 02/tj
Spectral measurement
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Human cone sensitivities
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CIE 1964 Color matching functions
0
0,5
1
1,5
2
2,5
360 400 440 480 520 560 600 640 680 720 760 800
Wavelength (nm )
x( )y( )z( )
Tris
tim
ulu
s v
alu
es
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Jan 02/tj
Chicken cone sensitivities
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Jan 02/tj
Spectral approach to color
• In spectral approach, color is represented by color signal. This causes the color sensation
• The signal is part of electromagnetic spectrum
- in human color vision the range is 380-780 nm
• In spectral approach, we are not limited into this human visual range
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Jan 02/tj
Motivation for spectral color
• Not to loose important color information (To avoid the problem of metamerism)
• To define optimal color sensors
• To develop better color vision models
• To develop novel instruments
• To develop spectral color classifiers and optical implementations for them
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Jan 02/tj
Outline
• Basics
• Spectral image
• Spectral imaging systems
• Applications
• Summary
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Jan 02/tj
Component images of spectral image
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Jan 02/tj
Spectral Image
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Spectra from leaves in previous image
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Jan 02/tj
MEMORY REQUIREMENTS OF IMAGES
Image size 256x256 512x512
gray-level image 65 kb 262 kb
color (RGB-) image 196 kb 786 kb
spectral, 20 nm resol. 1 Mb 4 Mb
spectral, 5 nm resol. 3 Mb 15 Mb
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Jan 02/tj
Definitions• Spectral image
An image, where each pixel is represented by
a spectrum
• Hyperspectral
A term used for spectral images with large
number of spectral components
• RGB-image
spectrum in visible region, three components
• Multispectral
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Jan 02/tj
Image Types
TYPE SPECTRAL COMPONENTS---------------------------------------• Gray-scale• Trichromatic• Spectral
– Hyperspectral• Real-time spectral
• Single• Three• >3• Numerous• Numerous
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Jan 02/tj
Outline
• Basics
• Spectral image
• Spectral imaging systems
• Applications
• Summary
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Jan 02/tj
Spectral Imaging Devices
• Spectral cameras– filter wheels– light filtering– scanning systems– multi-band detectors
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Jan 02/tj
Optical principles
• Narrow band filters– interference filters, LCTF, gratings– AOTF
• Broad band filters– absorbance filters– e.g. gratings to implement optimal filters
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Jan 02/tj
Joensuun yliopistoPL 11180101 Joensuu
puh. (013) 251 111fax (013) 251 2050
www.joensuu.fi
Formation of the Color Signal
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Filter wheel based system
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Specim Spectral Camera
http://www.specim.fi
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Jan 02/tj
A spectrum sampled at 39 wavelengths
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Jan 02/tj
Spectral Imaging
• One approach: to measure the spectral data accurately
A large amount of data
• Other approach: to measure component images using a few optimally designed color filters
Data is convenient for storing and transmission
Spectral image can be reconstructed computationally
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Jan 02/tj
Color Filter Design
• One approach: to choose an optimized set of commercially available color filters (for example, Kodak Wratten gelatin filters)
• Other approach: to design optimal color filters computationally (our approach)
adaptive to various application rewritable filter based imaging system needed
Spectral image can be reconstructed computationally, if needed
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Jan 02/tj
ACTIVE TYPE
Optimal Light Source
Sample Sample
CCDcamera
CCDcamera
OutdoorIndoor
Light Source
Optimal Filter
Sample + Optimal Light Source Sample + Optimal Filter
PASSIVE TYPE
Next, computational color filter design and thefollowing spectral imaging systems will be studied
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Jan 02/tj
Outline
• Basics
• Spectral image
• Spectral imaging systems
• Applications
• Summary
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Jan 02/tj
Some applications
• E-commerce
• Tele-medicine
• Image archives
• Accurate color measurement and representation
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Jan 02/tj
Digital Imaging
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Jan 02/tj
Display characterictics
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Broadband network society
Image ProcessingSystem
DisplayImage Acquisition
NetworkDatabase
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E-commerce
Telemedicine
E-commerce, telemedicine in broadband network society
ClothesPaintsTextileBags….
Facial colorSkin diseaseExpressions…..
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Jan 02/tj
Joensuun yliopistoPL 11180101 Joensuu
puh. (013) 251 111fax (013) 251 2050
www.joensuu.fi
E-commerce
Differences between images on a display and real images
Online shopping
Return of products
Figure: Tsumura-san, Chiba Univ.., Japan
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Jan 02/tj
Joensuun yliopistoPL 11180101 Joensuu
puh. (013) 251 111fax (013) 251 2050
www.joensuu.fi
Environmental dependence of color
Network
Patient
Medical doctor
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Jan 02/tj
Image reproduction
• multi-primary displays - six components projective display
(Natural Vision Research Center, Tokyo)
• multi-primary printing
- inkjet
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Jan 02/tj
Multiprimary display
• The objects are measured as spectral images
• The display contains 6 primary colors
avoids the problem of metamerism larger color gamut natural colors colors can be seen the same in the measurement place and in the viewing place
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Jan 02/tj
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Jan 02/tj
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Jan 02/tj
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Jan 02/tj
RGB-projector
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Jan 02/tj
RGB-filters
High and low pass filters
Multiprimary display
6 filters for
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Jan 02/tj
Modified RGB-projector
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Jan 02/tj
Multiprimary display
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Jan 02/tj
Color gamuts for CRT-display and multiprimary display
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Jan 02/tj
Spectral video
• Sequence of spectral images
• Shown as movie on the screen
• Very high memory requirements
• Efficient compression has been used
• Shown as RGB or multiprimary (TAO, Japan)
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Jan 02/tj
Compression method
• it has been found that separate spatial and spectral compression give best results
• in spectral dimension, PCA-based compression give best results
• combination of PCA in spectral and JPEG in spatial dimension give best PSNR-values for reasonable compression ratios
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Jan 02/tj
Outline
• Basics
• Spectral image
• Spectral imaging systems
• Imaging context
• Applications
• Summary
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Jan 02/tj
Summary
• Spectral imaging increasing
• Novel instruments needed
• Novel detectors needed
• Novel image compression methods needed
Color research at Joensuu: WWW: http://cs.joensuu.fi/~spectral
Email: [email protected]
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Reconstructed Images
•Reconstructed Images from Measured Spectral Images
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Observation of Spectral Reflectance
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Church
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Color Change by Cleaning
OriginalOriginal OnceOnce TwiceTwice Three TimesThree Times
Reconstructed images from Measured Spectral Images
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Observation of Spectral Reflectance
OriginalOnceTwiceThree Times
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Cleaning Process
1st Cleaning 2nd Cleaning 3rd Cleaning
Each subtract image is normalized by Maximum value