Concept
Camera matrix — where it appears
2 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.
The image of the other eye
Two photographs of one courtyard, and in each of them a point that is the other camera. It is computed from forty-four matched marks and nothing else, and it lands on the projection of the other eye to about a billionth of a pixel.
Four cameras fit, and one of them can see
The essential matrix does not determine a camera pair. It determines four, all of which reproject every correspondence exactly, and the thing that picks one is not more algebra — it is the assumption that the photographer could see what was photographed.
Named alongside it
The objects these essays reach for when they reach for this one.
BaselineCorrespondenceFundamental matrixCheiralityEpipolar geometryEpipoleEssential matrixFocal lengthreconstruction ambiguityRelative pose