Computational filters, statistical filters and "seeing" in the UV

[Aaron E.]

One of my few remaining day jobs is as the editor-in-chief of the British Ecological Society's journal Methods in Ecology & Evolution. We just published this article: A comparison of photographic and spectrometric methods to quantify the colours seen by animal eyes (open-access), and I'd be curious to know UVPer's feedback on it and on its comparison to the MICA toolbox.

 

Both of these look interesting, and I'm wondering if anyone has experience or thoughts about either/both.

 

Thanks!

Aaron

[Lou Jost]

Aaron, nice to see you here! Thanks for pointing out this article, it looks interesting.

Lou Jost

[Andrea B.]

I would like to see more comments here members!

Aaron, I've been offline with the hand break thing, but am able now to take a look myself.

[Andy Perrin]

I brought up the statistical filtering method back here (without using that name for it, which I didn't know until reading the paper you linked above). I wasn't aware of the MICA toolbox either — I thought I would have to write something myself from scratch!

Quote

Posted June 7, 2021

There is actually a very nice way to combine images from multiple filters based on Wiener filtering that I haven't gotten around to implementing yet, but has strong theoretical justification and should allow correct reconstructions with filter overlap based on multiple individual band photos. It's been used successfully for hyperspectral imaging. Unfortunately, I suspect the mathematics is going to be beyond what most of the people around here are willing to learn, so unless I write some kind of non-MATLAB software to let everyone else do it, it's probably going to be just me using this method:

http://citeseerx.ist...p=rep1&type=pdf

https://link.springe...054661807020101

https://www.ncbi.nlm...les/PMC7041456/

Several of those papers use just RGB data to estimate a hyperspectral response(!) with so-so accuracy, but it's possible to do better if you have 7 or 8 bandpass filters like Jonathan. (It is even possible to use non-bandpass filters with this method provided that the transmissions are varying enough at each wavelength when you consider the whole set of filters.)

 

Once you have an estimated hyperspectral reflectance image, you can obviously define any kind of synthetic bandpass filters you please (and imaginary light sources too!) and render a tricolor.