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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Lecture outline Basics Spectral image Spectral imaging systems Applications Summary Lecture material by: Markku Hauta-Kasari, Kanae Miyazawa, Jussi Parkkinen,
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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
Jan 02/tj
Spectral measurement
Human cone sensitivities
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
Jan 02/tj
Chicken cone sensitivities
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
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
Jan 02/tj
Outline
• Basics
• Spectral image
• Spectral imaging systems
• Applications
• Summary
Jan 02/tj
Component images of spectral image
Jan 02/tj
Spectral Image
Spectra from leaves in previous image
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
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
Jan 02/tj
Image Types
TYPE SPECTRAL COMPONENTS---------------------------------------• Gray-scale• Trichromatic• Spectral