My background is in Computer Science so I know that my question may be trivial/stupid...

I am developing a system with an Hyperspectral camera that makes images of some food on a background. I would like to have a background that has a spectrum with a reflectance close to zero for all the wavelengths (400-1000nm) in order to easily segment the objects that lie on it.

Should I use a specific material or rather a calibration procedure to achieve this goal?

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