Lourakis,M., Argyros,A.
Abstract:
Intrinsic camera calibration using a single image is possible provided
that certain geometric objects such as orthogonal vanishing points and
metric homographies can be estimated from the image and give rise to
adequate constraints on the sought calibration parameters. In doing so,
however, any additional metric information that might be available for
the imaged scene is not always straightforward to accommodate. This paper
puts forward a method for incorporating into the calibration procedure
metric scene information expressed in the form of known segment 3D angles,
equal but unknown 3D angles and known 3D length ratios. Assuming
the availability of an initial calibration estimate, the proposed method
refines the former by numerically minimizing an error term corresponding
to the discrepancy between the scene's known metric properties and the
values measured with the aid of the calibration estimate. Sample
experimental results demonstrate the improvements in the intrinsic
calibration estimates that are achieved by the proposed method.