Convergence — where it appears
Named by 2 essays across one field — each of them below, with the objects they name alongside it.
Also named here as levenberg–marquardt — the same set of essays touches all of them, so they are one junction rather than several.
Where the adjustment stops
Given exact marks the reprojection error falls to a hundredth of a billionth of a pixel, which is arithmetic. Given the same marks read to a whole pixel it falls to a third of a pixel and stays there, and a solver that reached zero on those would be fitting the rounding.
A start needs the sign of its depths, not their size
Started part of the way from a courtyard toward its inside-out twin, a bundle adjustment returns to the truth from every start less than 42 per cent of the way — a start with a sixth of the true relief, the right way round — and falls into the twin from every start past 56. Between, neighbouring starts settle in different answers. The band sits in the same place at a 3° field, where the twin misfits by under a pixel, and at 25°, where it misfits by seven and a half.
Named alongside it
The objects these essays reach for when they reach for this one.
bundle adjustmentLevenberg–MarquardtReprojection errorCorrespondenceDepth reversalfield of viewOrthographicOverfittingResidualstructure from motion