skew rays — where it appears
Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.
Two rays that do not meet
Triangulation is described everywhere as the intersection of two rays, and two rays in space do not intersect. Read the same two marks to a whole pixel and they miss by 2.77 mm at seven metres, which is a real length and is the part a residual will not report.
Every row is a different camera
A shutter that reads its rows one after another images each of them from wherever the camera was at that instant, so a frame is a stack of projections indexed by height — a handscroll with the roll running down the picture. Its rays miss their own best centre by the spread of the eye's track, at a ratio of 0.988, and a global shutter's meet to 2 × 10⁻¹⁶ m.
Named alongside it
The objects these essays reach for when they reach for this one.
ResidualBaselinecentre of projectionCorrespondenceDemonstrationdirect linear transformDrawing systemHandscrollleast-squares intersectionMoving viewpointPushbroomReprojection error