We have compiled a list of the 10 most frequently asked questions regarding hyperspectral imaging based on our customer visits and demo tours. We’ve divided this list to 2 parts, starting with the five easiest ones and then on our next post will round out the full “Top 10” list with little more complicated questions. So stay tuned for the next installments of the series in a few days.
1 – What is a hyperspectral imaging or hyperspectral camera?
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. So in comparison to a “normal” camera, an SLR or a point-and-shoot type camera, a hyperspectral camera does not record images with 3 bands only, but with hundreds of bands. As an illustration, our hyperspectral cameras dedicated for example to the visible spectral region (VIS 390 – 700 nm) record images over at least 750 bands.
Now for each of these bands, an image is created, coded with grey scale levels (as for a RGB image there will be the Red, Green and Blue components of the image). When you combine these images or bands you form a hyperspectral data cube for processing and analysis.
In short hyperspectral imaging combines digital imaging with spectroscopy – provides spectral information in each image pixel. Each pixel can then be associated with the spectral signature of the target. This result can be then used to identify, measure and locate different materials and their chemical and physical properties.
– Mathieu Marmion, French and Norwegian MSc in electrical engineering, Finnish PhD in physical geography, joined Specim in June 2011 as a Technical Sales Engineer. Since 2013, he has working as a Sales Manager, responsible for Industrial and Research applications in Europe.