Dynamic calibration of an active stereo head
Crowley, J.L.; Bobet, P.; Schmid, C.
Computer Vision, 1993. Proceedings., Fourth International Conference on
Volume , Issue , 11-14 May 1993 Page(s):734 - 739
Digital Object Identifier 10.1109/ICCV.1993.378141
Summary:The authors present a method for using objects in a scene to
define the reference frame for 3-D reconstruction. They first present a
simple technique to calibrate an orthographic projection from four
non-coplanar reference points. It is then shown that the observation of
two additional known scene points can provide the complete perspective
projection. When used with a known object, this technique permits a
calibration of the full projective transformation matrix. For an
arbitrary non-coplanar set of four points, this calibration provides an
affine basis for the reconstruction of local scene structure. When the
four points define three orthogonal vectors, the basis is orthogonal,
with a metric defined by the lengths of the three vectors. This
technique is demonstrated for the case of a cube. Results are presented
in which five and a half points on the cube are sufficient to compute
the projective transformation for an orthogonal basis by direct
observation without matrix inversion. Experiments are outlined for
reducing the imprecision due to pixel quantization and noise
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