This paper introduces a family of 4 4 4 tensors, referred to as “join tensors” or Jtensors for short, which perform “3D to 3D” alignment between coordinate systems of sets of dynamic 3D points. 3D Configurations of points are obtained by a 3D measuring device (such as a structured light or laser range sensor, or a stereo rig) at times t1; t2; t3 from different viewing positions in addition to t...

Accurate 3D measuring systems thrive in the past few years. Most of them are based on laser scanners because these laser scanners are able to acquire 3D information directly and precisely in real time. However, comparing to the conventional cameras, these kinds of equipment are usually expensive and they are not commonly available to customers. Moreover, laser scanners interfere easily with eac...

In this paper, we present an easy method for automatic 3D garment pre-positioning. Given a digital 3D mannequin and a set of 2D patterns, the problem consists in sewing automatically the patterns around the mannequin and give an initial position of the garment that the mannequin has to wear. Our method is based upon the use of a figurine. A figurine of a virtual garment, which is always present...

Extensive wind tunnel tests are conducted to evaluate surface pressure distribution of a semi span swept wing. The wing section has a laminar flow airfoil similar to NACA 6-series airfoils. The investigations are conducted at various speeds and angles of attack. Surface pressure distribution over the wing upper surface is measured for both chordwise and spanwise sections. Statistical analyses a...

This paper describes a simple low-cost 2D and 3D positioning system for mobile robots. The system makes use of both ultrasound and radio frequency signals to achieve positional accuracies better than 1% of the tracked volume. Furthermore, we have integrated the positioning system into the simulation tools Player/Stage, in order to combine simulated robots with real robots in a ‘hybrid’ embodied...

The perspective-n-point (PnP) problem, which estimates 3D rotation and translation of a calibrated camera from n pairs of known 3D points and corresponding 2D image points, is a classical problem but still fundamental in the computer vision community. It is well studied that the PnP problem can be solved by at least three points [1]. If n ≥ 4, the PnP problem becomes a nonlinear problem where t...

Being able to efficiently compare as-built against as-planned 3D states is critical for performing efficient building and infrastructure construction, maintenance, and management. Threedimensional (3D) laser scanners have the potential to be successfully applied to these tasks. Recent commercial products allow the comparison of 3D scanned and 3D CAD data based on CAD forms. Their current use is...

3D face recognition technique has gained much more attention recently, and it is widely used in security system, identification system, and access control system, etc. The core technique in 3D face recognition is to find out the corresponding points in different 3D face images. The classic partial Iterative Closest Point (ICP) method is iteratively align the two point sets based on repetitively...

Assume that only partial knowledge about a non-rigid registration is given so that certain points, curves, or surfaces in one 3D image map to certain certain points, curves, or surfaces in another 3D image. We are facing the aperture problem because along the curves and surfaces, point correspondences are not given. We will advocate the viewpoint that the aperture and the 3D interpolation probl...