Description. From several images of a scene and the coordinates of corresponding points identified in the different images, it is possible to construct a 3-dimensional point-cloud model of the scene, and compute the camera locations. From uncalibrated images the model can be reconstructed up to an unknown projective transformation, which can be upgraded to a Euclidean model by adding or computi...

We study the configuration space of rectangulations and convex subdivisions of n points in the plane. It is shown that a sequence of O(n log n) elementary flip and rotate operations can transform any rectangulation to any other rectangulation on the same set of n points. This bound is the best possible for some point sets, while Θ(n) operations are sufficient and necessary for others. Some of o...

We present a system for detection of joint positions in scans of articulated models. Our method is based purely on skeletons extracted from scanned point clouds of input models. First, skeletons are extracted from scans and then an estimation of possible matches between skeletons is performed. The matches are evaluated and sorted out. The whole matching process is fully automatic, but some user...

Light Detection and Ranging (LIDAR) can be used for collecting spatial data of power (transmission) lines providing more accurate geometric information of the power lines and vegetation/object near power electric network. However problem with this kind of data is extraction and classification of raw point cloud data. There is no perfect automatic classification of points, so it is necessary to ...

In this paper we present “Touching the Cloud”, a bi-manual user interface for the interaction, selection and annotation of immersive point cloud data. With minimal instrumentation, the setup allows a user in an immersive head-mounted display (HMD) environment to naturally interact with point clouds. By tracking the user’s hands using an OpenNI sensor and displaying them in the virtual environme...

2-(3- indolyl) – 4,5 di phynyl imidazole.(IDPI) was used as a complexing agent in cloud point extraction for the first time and applied for selective pre-concentration of trace amounts of cadmium. The method is based on the extraction of cadmium at pH= 7.0 by using non-ionic surfactant Triton-X114 and 2-(3- indolyl) – 4,5 di phynyl imidazole. (IDPI) as a chelating agent. The adopted concentrati...

To assess if a given manufactured artifact conform to a template CAD model, the artifact is measured by a coordinate measuring system to obtain a point cloud. The point cloud is compared to the CAD model by fitting the point cloud to the CAD model. One of approaches is based on a method required to determine footpoint parameters. The footpoints are the projection of the points in the point clou...

We present a new method for extracting features of a 3D object targeted to CAD modeling directly from the point cloud of its surface scan. The objective is to obtain an editable CAD model that is manufacturable and describes accurately the structure and topology of the point cloud. The entire process is carried out with the least human intervention possible. First, the point cloud is sliced int...

Most solar radiation models implemented in Geographical Information Systems (GIS) operate on 2.5D raster data. There are only a few models using the full 3D information of a point cloud obtained by e.g. Airborne Laser Scanning (ALS) systems. However, models performing point cloud based solar radiation modeling are not suitable for large study areas because the huge amount of point cloud data ca...

With the development of computer hardware, the 3D scanner is cheaper, and more and more 3D data can be got from 3D scanner. The data can access as the point cloud data. So, the processing for large-scale point data has been as the new branch of computer graphics. This paper provided a new algorithm for point cloud organization based on improved Kmeans. The point cloud can be store as a tree. At...