Hyperspectral and reciprocal lighting DISCOVER MORE @ Enhanced - - PowerPoint PPT Presentation

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hyperspectral and reciprocal lighting
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Hyperspectral and reciprocal lighting DISCOVER MORE @ Enhanced - - PowerPoint PPT Presentation

Nov 09, 2023 121 likes •286 views

Hyperspectral and reciprocal lighting DISCOVER MORE @ Enhanced Imaging, Enhanced Lighting 1 www.cvrlighting.com Hyperspectral imaging Hyperspectral imaging is basically colour CONTENTS imaging, but without being restricted to 1.

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DISCOVER MORE @ www.cvrlighting.com Enhanced Imaging, Enhanced Lighting 1

Hyperspectral and reciprocal lighting

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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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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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Matrix Lighting specifics

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

Wavelength ranges Spectral definition Lighting unit / sensor matching Spatial / spectral uniformity Spatial / spectral contrast Control sensitivity Calibration

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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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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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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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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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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

Area lighting

Courtesy of IMEC

Spatial spectral uniformity

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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

Linear lighting

Spatial spectral uniformity

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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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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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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

  • f in situ calibration procedures.
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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

  • f 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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Thank You www.epi-light.com

CVR Lighting Ltd, Hoffmann Park, Inchera, Little Island, Cork, Ireland

www.cvrlighting.com– sales@cvrlighting.com - +353 21 4510232 Germany +49 172 3652253