When mapping photons from the spectral cube to the detector plane through Poisson sampling, the photons should first be converted to DN. That is, the weights of the resulting histogram should add in DN space while the sampling should continue to be done in photon space.
When mapping photons from the spectral cube to the detector plane through Poisson sampling, the photons should first be converted to DN. That is, the weights of the resulting histogram should add in DN space while the sampling should continue to be done in photon space.