Tech Imaging Services Experts in High-Speed Imaging & Hyperspectral Cameras

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What is Hyperspectral Imaging?

The way in which light interacts with materials offers a way to identify them and study their properties. Hyperspectral imaging (HSI) combines digital imaging with spectroscopy –  it provides spectral information in each image pixel.

Hyperspectral imaging can be used in reflection, transmission, or emission measurements. It is a non-destructive method for analysis and data collection across a wide variety of applications.

Spectral Measurement Types

A hyperspectral camera collects and processes information by measuring the light interaction (reflection, transmission or emission) in order to obtain the Spectrum – the fingerprint -  for each pixel in the image of a scene, with the purpose of finding objects, identifying materials or detecting processes. 

Hyperspectral Camera Mechanics

What does a Spectrum tell us?

Every single point in an object has its own unique spectral fingerprint – the spectrum.

Spectra can be used to identify and separate different materials and objects.

Spectral Fingerprint Example

Hyperspectral Camera Ranges

Hyperspectral imaging cameras, collects and processes information in order to obtain the spectral information for each pixel in the image of a scene, with the purpose of finding objects, identifying materials, or detecting processes.  

Whereas the human eye sees color of visible light in mostly three bands (red, green, and blue), spectral imaging divides the spectrum into many more bands. This technique of dividing images into bands can be extended beyond the visible. In hyperspectral imaging, the recorded spectra have fine wavelength resolution and cover a wide range of wavelengths:

VIS cameras (380 - 800 nm)

VNIR cameras (400 - 1000 nm)

NIR Cameras (900 - 1700 nm)

SWIR Cameras (1000 - 2500 nm)

MWIR Cameras (3 - 5 µm)

LWIR Cameras (8 - 12.4 µm).

 

Applications of Hyperspectral Cameras

Color Applications - Hyperspectral imaging accurately measures colors:
  • Printing process monitoring
  • Display quality & color accuracy
  • Color conformity check of manufactured products
  • Art analysis & restoration

 

Detection & Identification - Hyperspectral imaging sees much more than the human eye when used for:
  • Plant disease and stress detection, phenotyping
  • Food, fruit, vegetable, grain, seed quality sorting
  • Forensics sample and crime scene inspection
  • Skin anomalies detection
  • Life sciences

 

Chemical Imaging - Hyperspectral mapping of chemical compositions for:
  • Waste material sorting & recycling.
  • Sorting of dangerous construction waste and medical waste, without human error
  • Bulk material monitoring, moisture content, foreign material detection
  • Composition of pharmaceutical products
  • Quality of food raw materials & products
  • Mineral mapping of geological samples
  • Threat detection

 

Remote Sensing - Airborne hyperspectral imaging detects and classifies targets. Examples include:
  • Geological exploration
  • Environmental health
  • Inspection of man-made infrastructure
  • Precision Agriculture
  • Law enforcement & military

 

Examples of Hyperspectral Imaging Applications

Fake Pharmaceutical Sample Detection

Three blister packages that were identical in visual inspection were measured. Packages contained white Ibuprofen and Parasetamol tablets. Before measurement one pill from one of the packages was removed and replaced with wrong type. Hyperspectral imaging clearly visualized the substituted tablets.

Standard image shows no observable difference in the counterfeit drug.Standard image shows no observable difference in the counterfeit drug.
Hyperspectral image reveals a clear visualization of the counterfeit drug tablets.Hyperspectral image reveals a clear visualization of the counterfeit drug tablets.

 

Data processing included reflectance calculation and first derivative calculation before making principal component analysis using the Perception Studio software.

Classification was done using the first and second component.

Analytical data from the counterfeit drugs Average spectrum (solid line) and spectral variation (shadow) of the tablet types and package background

 

Food Quality

 Hyperspectral imaging is a powerful tool to monitor food quality, composition and attributes. It can be used to verify food safety and manufacturing consistency.

Moisture distribution in a fresh slice of bread. Image courtesy of Campden Bri.Moisture distribution in a fresh slice of bread. Image courtesy of Campden Bri.

Chocolate bar composition. Image courtesy of Campden Bri.Chocolate bar composition. Image courtesy of Campden Bri.

 

Color Measurement

In today’s world, different displays have a notable role in our daily life. HSI offers a straightforward way to monitor the quality of TV and computer screen, tablets and cell phones.

Test image covers all the colors available on the phone Test image covers all the colors available on the phone.

Color coordinate comparison of two cell phones from different manufacturers.  Color coordinate comparison of two cell phones from different manufacturers.

 

Mineral Classification

Hyperspectral imaging was originally developed for the mining and geology industries. It is an ideal method for identifying commercially valuable minerals in core samples or identifying the presence of ore or oil.

Long Wave Infrared image of minerals.Quartz and feldspar minerals are visualized with a Specim hyperspectral camera.

Hyperspectral camera image showing classification of minerals.