| Description | 5
Description
Hyperspectral Imaging
Hyperspectral imaging combines digital imaging with spectroscopy, detecting the unique spectral information in
each image pixel. It can be used to identify, measure, and locate different materials and their chemical and physical
properties.
Compared to the conventional visible light imaging, both monochromatic and color, hyperspectral imaging produces
much more detailed information with an expanded wavelength range, also recording the data invisible to the human
eye, to be computed and analyzed.
Pushbroom imaging technique
SPECIM FX cameras use pushbroom line scanning technique, which means that the target is scanned one spatial line
at a time and full spectral data from that line is aqcuired simultaneously.
Using pushbroom technique always requires that either camera or the target moves and the movement builds up
the image. The movement can be achieved for example by mounting the FX camera to a scanner, vehicle, or over a
conveyor belt.
Illumination Overview
In spectral imaging, good illumination plays a bigger role than in conventional digital imaging. When arranging
illumination, pay attention to three main parameters: intensity, spectral response and uniformity.
Intensity
Hyperspectral imaging needs more light than ordinary machine vision system as the light is divided to narrow
wavelength bands and each band is measured separately. As a result, each pixel receives less light during fixed
integration time than, for example, in RGB color imaging and the illumination used for hyperspectral imaging is
brighter than the illumination used for standard cameras. The need for light can be partly compensated by using
longer integration (exposure) times, but at the same time the measurement becomes slower.
All rights reserved - Specim, Spectral Imaging Oy Ltd.
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