The user manual mentions using one 88% reflectance target and 17% reflectance target for calibration. I don't know what material has those reflectance values. What exactly should I use for calibration and where can I get those?
It’s called Munsell Color Paper
4300 44th street S.E.
Grand Rapids, Mi 49512
The stuff is expensive. Like $26 per sheet expensive.
We use 5%, 17%, 42% and 88% reflectances in our testing. One color per sheet.
MUNSEL NOTATION N2.75/
But standard Photo grade white paper is close enough to 88%, that it will work unless you are really particular.
Black spray paint is 5% reflective. Use a couple of coats. Doesn't matter if it's flat or gloss.
I don't have a good source of 17% gray.
Have a look at this lecture presentation: https://www.cs.cmu.edu/afs/cs/academic/class/15462-f09/www/lec/lec8.pdf
Also, Wikipedia offers quite good explanation: Reflectance - Wikipedia
However, I wasn't able to find some online trustworthy database of reflectance of various materials.
Thanks David! The two links you posted explained what reflectance is pretty well. It sounds like the white target is probably something opaque and with a smooth surface finish. And the dark target is probably something with a rougher finish?
I found this chart on Google. I don't know how trustworthy this is but I thought it was interesting enough.
I've found this sentence from the VL53L0X datasheet (under "Performance" -> "Measurement Conditions"):
Reflectance targets are standard ones (Grey 17% N4.74 and White 88% N9.5 Munsell charts).
So it seems like the targets are Munsell color cards. Now the problem becomes how to get those color cards... A quick search online only reveals small pocket sized color cards, which is probably not big enough...
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