In this work, we present a novel Panoramic Fringe Projection system (PFP) to retrieve the three-dimensional topography of quasi-cylindrical objects along their full length and around the entire circumference. The proposed procedure uses a 45° concave conical mirror to project a circular sinusoidal fringe pattern onto a specimen placed coaxially to the mirror and at the same time to image the modulated fringe pattern diffused from the object surface. In order to obtain the required sensitivity, an axicon is used to create a divergent fringe pattern with constant pitch. By processing the phase map, information on the radius over the full 360° surface of the sample can be obtained by using a single-view series of images captured from a single camera. To verify the feasibility of the PFP technique, a tubular sample with shape discontinuities has been tested. The proposed method demonstrated to be able to retrieve the accurate topography of quasi-axial-symmetric samples with complex geometries for a large variety of applications.
Stereo Vision is a powerful tool used to make a 360° scan of an object in order to obtain topography details
or getting the spatial position of interest points, but the process could be slow due to the computing time. In this
work we present the alternative of using high reflective markers, which are used as reference points to track an
object movement. The advantage of these markers is that their detection is faster than a full scene correlation and it
is done by comparing the position of the centroids of each marker without using pixel-pixel analysis.