Turning a flat sensor into a semi-spherical one

[crackwitz]

that paper, Fig 5, uses an equirectangular projection. axes are linear in degrees.

@Dom_Newman

does it calculate how much ‘movement’ (d(tan)/dx) on a flat sensor each degree produces, then uses that to compensate the pixel size?

assuming I understand your question, that’s a yes, but I feel an urge to split hairs.