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I have recently come across a paper entitled, "Portable Multispectral Imaging System Based on Raspberry Pi".

In this work, the authors have presented a low-cost spectral imaging system using a raspberry pi. This is done by light multiplexing through a LED panel where 8 selected wavelengths covering the spectrum UV to NIR is included. The camera used is a Raspberry Pi NoIR, RGB camera add-on for raspberry pi that does not have any IR cut filter installed.

When the sample is situated in the corresponding position inside the prototype, the system takes a photograph at each available wavelength sequentially.

Here's an example of an image captured at different wavelengths:

Photographs of a damaged apple

Images at 590 nm

and reflectance spectra of good and over-ripe peaches

But I do not understand how they were able to compute the reflectance spectra in the plot.

Or did I understand it correctly that the reflectance spectra is the computed intensity, using the equation below?

Intensity of an image

Why would that be? Can anyone please direct me to the proper readings or source materials in order to understand this concept? Please enlighten me. I am new to this. Thank you!

bellawillrise
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  • It seems you have to sign up to some academic journal or some Microsoft rubbish and get bugged for ever more to read that paper ‍♂️ – Mark Setchell Jul 23 '21 at 20:28
  • You may access the paper here: https://sci-hub.se/10.1108/SR-12-2016-0276 @MarkSetchell – bellawillrise Jul 23 '21 at 21:29
  • I don't know why academics don't share their code on Github like the rest of the world - anyone know? Maybe you could ask the author, this appears to be her homepage http://www.ugr.es/~nurilr/ Please share any updates you obtain on this interesting paper. – Mark Setchell Jul 24 '21 at 08:41

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