In this paper we present a model-based approach for real-time camera pose estimation in industrial scenarios. The line model which is used for tracking is generated by rendering a polygonal model and extracting contours out of the rendered scene. By un-projecting a point on the contour with the depth value stored in the z-buffer, the 3D coordinates of the contour can be calculated. For establis...

We present in this paper an iterative algorithm for the simultaneous registration of multiple 3D medical images. The proposed algorithm is a point-based registration method and is based on global registration techniques rather than the traditional pair-wise registration methods. Corresponding feature points, known as extremal points, are first automatically extracted from the 3D images and are ...

This paper presents a novel method to extract skeletons of complex articulated objects from 3D point cloud sequences collected by the Kinect. Our approach is more robust than the traditional video-based and stereobased approaches, as the Kinect directly provides 3D information without any markers, 2D-to-3D-transition assumptions, and feature point extraction. We track all the raw 3D points on t...

This paper presents the 3D reconstruction of planar objects using the normal vector of plane and vanishing points from a single panoramic image. We get the geometric information of plane or line with feature points which use the constraints of coplanarity, perpendicularity and parallelism of planes or lines. We describe the 3D reconstruction about any features using the properties of vanishing ...

We evaluated our algorithm on the Benchmark for 3D Interest Point Detection Algorithms [2], whose goal is to provide quantitative evaluation for detecting interest points vs. human-marked points. The benchmark contains 43 models organized in two data sets. Data-set A includes 24 of the models for which 23 human subjects have marked the interest points. Dataset B contains all the 43 models marke...

A novel registration method is presented for 3D point clouds, acquired from a multi-view camera, for scene reconstruction. In general, conventional registration methods require a high computational complexity, and are not robust for 3D point clouds with a low precision. To remedy these drawbacks, a projection-based registration is proposed. Firstly, depth images are refined based on temporal pr...

PURPOSE To develop a procedure for the optimum patient positioning and immobilization during boron neutron capture therapy (BNCT) of glioblastoma multiforme (GBM) at the Brookhaven medical research reactor (BMRR). METHODS A replica of the treatment room in the BMRR was constructed to simulate patient position. A unique feature is a transparent opening in wall to simulate the location of the b...

GNSS community has developed a series of GPS-based techniques for clock measurements and comparisons including time dissemination with the standard GPS point positioning method, clock synchronization using the codebased differential GPS positioning technique and using precise point positioning (PPP) for clock comparison. In the mean time, significant advances have been made towards real time ki...

We present an interface for 3D object manipulation in which standard transformation tools are replaced with transient 3D widgets invoked by sketching context-dependent strokes. The widgets are automatically aligned to axes and planes determined by the user’s stroke. Sketched pivot-points further expand the interaction vocabulary. Using gestural commands, these basic elements can be assembled in...