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Enhanced Imaging, Enhanced Lighting 2
Hyperspectral imaging
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
Hyperspectral imaging is basically colour
imaging, but without being restricted to
the visible part of the spectrum or to a
three channel system.
Hyperspectral imaging provides a new data
dimension, additional to spatial,
geometrical, quantitative and other
dimensions, in which a discriminant can be
found.
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Enhanced Imaging, Enhanced Lighting 3
Hyperspectral lighting
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
There are multiple hyperspectral imaging
solutions. Each operate across a specific
range of wavelength.
Broad lighting, such as natural sun light, or
halogen light, can be used as light sources.
These light sources are however difficult to adapt to the specific
sensitivities and ranges of the hyperspectral sensors.
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Enhanced Imaging, Enhanced Lighting 5
Wavelength ranges
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
For hyperspectral imaging the lighting unit
is matching the range of sensitivity of the
sensor. We currently offer luminaires in the
visible, the near IR, and a combination of
both.
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Enhanced Imaging, Enhanced Lighting 6
Spectral definition
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
Wide spectrum ranges are achieved with a
mix of narrow emitting LEDs and wide
emitting LEDs. CVRL’s 16 channel Matrix
has 15 narrow emitting LEDs and 1 broad
emitting LED.
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Enhanced Imaging, Enhanced Lighting 7
Lighting / Sensor
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
The modulation of
each channel gives the
user the opportunity to
inversely match the
sensor response curve.
Where responsive, a
small amount of light is
emitted. Where
insensitive, a large
amount of light is
emitted.
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Enhanced Imaging, Enhanced Lighting 8
Spatial spectral uniformity
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
The modulation of the spectrum ensures
that the emitted light of an hyperspectral
lighting unit is uniform when imaged by a
hyperspectral camera. The architecture,
and in particular the optical elements of
the light must ensure that this is true
across the entire field of view.
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Enhanced Imaging, Enhanced Lighting 11
Spatial spectral contrast
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
An uneven spatial spectral uniformity can
have benefits. It allows for example for
simultaneous capture of contrasted images
from various directions.
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Enhanced Imaging, Enhanced Lighting 12
Control sensitivity
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
12 bits control system (4096 levels) per
channel. Current control.
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Enhanced Imaging, Enhanced Lighting 13
Calibration
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
With between 1 and 16 channels, all
controlled with a 12 bit control range
between no and full power, calibration is
crucial. Each unit comes with 20 pre-
programmed profiles, some of which can be
requested.
However, the only proper calibration is in situ,
with a full system calibration, taking into
consideration the whole imaging/lighting
system.
CVRL offers its services for the development
of in situ calibration procedures.
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Enhanced Imaging, Enhanced Lighting 14
Reciprocal imaging
CONTENTS
1. Hyperspectral imaging
2. Hyperspectral lighting
3. Lighting specifics
4. Matrix – wavelength ranges
5. Matrix – spectral definition
6. Matrix – lighting unit / sensor matching
7. Matrix – spatial / spectral uniformity
8. Matrix – spatial / spectral contrast
9. Matrix – control sensitivity
10. Matrix – calibration
11. Reciprocal imaging
There are some drawbacks to hyper spectral
imaging: lower resolution, longer acquisition
time, etc.
One option, especially in linear systems, is
reciprocal lighting. It basically is the reduction
of the data space to its most significant
variables. In other word, it is the use of
monochrome cameras with selective lighting.
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CVR Lighting Ltd, Hoffmann Park, Inchera, Little Island, Cork, Ireland
www.cvrlighting.com– sales@cvrlighting.com - +353 21 4510232
Germany +49 172 3652253
