Augmented reality in spine surgery: critical appraisal and status of development.

In spinal surgery, computer assistance in the operating room is gaining fast-paced acceptance, but it would be simplistic to imagine that added technology is systematically beneficial to the patient. As surgeons are not experts in computer technology, there is a tendency to abandon the evaluation to the market and say the best will emerge. Based on our experience with the development of our own system and confronted with the emergence of new systems adopting solutions we had rejected, we propose a framework to compare various systems between them.

SYDESCO: a laser-video scanner for 3D scoliosis evaluations.

SYDESCO is a new 3D vision system developed for trunk surface topography. This structured light surface scanner uses the principle of triangulation-based range sensing to infer 3D shape. The complete trunk acquisition is fast (2 seconds).

Camera virtual equivalent model 0.01 pixel detectors.

In computer vision, a standard approach to eliminate spatial distortion is to use a calibrated grid. We developed an original method using such a grid to establish an equivalence between any camera with inherent technical limitations (optic, solid-state sensor, digitizer) and a perfect virtual pinhole camera model. This bijection based on interpolation concepts takes all the deformations generated by the optical and electronical equipment into account (distortion, decentration, scale, and affinity ratios) without the need for their explicit determination.