Inverse projection — where it appears
Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.
Dividing depth by eye
Three methods for spacing a receding row, all of them taught, all of them wrong. Read back as distances, the best misplaces a post by 3.5 metres in a row that is supposed to be spaced 1.4. And the obvious way of checking them gives one of the three a perfect score.
The render is distorted on purpose
A headset renders a bent picture so its lens can straighten it, which is the lens field's polynomial run backwards and the one place on this site where distortion is introduced deliberately. The round trip closes to a thousandth of a millionth of a pixel, and the price is that one rendered pixel becomes 0.646 delivered pixels at the edge of the field and one at the centre.
Named alongside it
The objects these essays reach for when they reach for this one.
AnisotropyBarrel distortionBrown–ConradyCamera calibrationCross ratio testDemonstrationDepth divisionDiminutionfield of viewHorizoninstrument limitMeasuring point