In this paper, we describe a novel uncalibrated active stereo system using coded structured light. Structured-light-based active stereo systems generally consist of a camera and projector that require precise precalibration. Therefore, if we can eliminate the precalibration process from the system, the user can merely place the equipment arbitrarily and directly begin scanning the objects. This...

A scalable multi-projector calibration method for arbitrary surrounded projection surface is proposed. The method is based on the viewing parameter based principle, which ensures that at each view point and in each direction, the image observed by the camera is the image rendered in these viewing parameters. The principle also ensures that multi-projector can be well aligned. Coded structured l...

We consider quantum spin systems defined on finite sets V equipped with a metric. In typical examples, V is a large, but finite subset of Z. For finite range Hamiltonians with uniformly bounded interaction terms and a unique, gapped ground state, we demonstrate a locality property of the corresponding ground state projector. In such systems, this ground state projector can be approximated by th...

Creation of accurate surface models of abdominal organs is essential for many developing technologies in medicine and surgery. One application we are working towards is augmented reality (AR) visualization for laparoscopic surgery. Our current system meets some, but not all, of the requirements. We use two custom built laparoscopes, a custom built miniature projector, a standard camera, and a s...

In computed tomography (CT), reconstructions from conebeam (CB) data acquired with a polychromatic X-ray device show so called beam hardening artifacts. Beam hardening artifacts are highly undesirable for a medical diagnosis, because details in the reconstructed image are severely disturbed or completely lost. In this work, we demonstrate the significant reduction of beam hardening artifacts by...

Recently, though a lot of information is generated in various fields, it is difficult for the users to access necessary information easily. In this study, a portable AR projection system that projects the information directly on the object using the portable projector based on the location information and the AR marker was developed. Particularly, this system can represent the three-dimensional...

Beam projector is popularly used for presentation. In order to pay attention to local area of the beam projector display, a laser pointer is used together with a pointing device(Mouse). Simple wireless presenter has limited functions of a pointing device such as “go to next slide” or “back to previous slide” in a specific application(Microsoft PowerPoint) through wireless channel; thus, there i...

Augmenting or annotating physical objects using steerable video projector and camera combinations works well in the range of the projection system. However, since these systems are usually mounted in fixed locations, users have to stay within a certain radius around that location. By using several of these AR-Projection systems, we can make the application roam these systems and thus follow the...