The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Object part segmentation is a challenging and fundamental problem in computer vision. Its difficulties may be caused by the varying viewpoints, poses, and topological structures, which can be attributed to an essential reason, i.e., a specific object is a 3D model rather than a 2D figure. Therefore, we conjecture that not only 2D appearance features but also 3D geometric features could be helpful...
Binocular stereo vision calibration is a hot research issue in the field of computer vision. In this paper, by means of 2D planar checkerboard calibration plate, essential matrix combined with calibration method of Zhang Zhengyou is used for a stereo vision calibration experiment. Firstly, corners of checkerboard is extracted by Harris algorithm. Calibration method of Zhang Zhengyou is used to calculate...
Detailed 3D modeling of indoor scene has become an important topic in many research fields. It can provide extensive information about the environment and boost various location based services, such as interactive gaming and indoor navigation. This paper presents an indoor scene construction approach using 2D line-scan LiDAR and entry-level digital camera. Both devices are mounted rigidly on a robotic...
The 6-DOF (Degrees Of Freedom) image localization, which aims to calculate the spatial position and rotation of a camera, is a challenging task for location-based services. In existing approaches, this problem is often tackled by finding the matches between 2D image points and 3D structure points so as to derive the location information using direct linear transformation (DLT). However, these approaches...
Here an accurate automated method based on fast marching approach for detecting visi-coil fiducial markers by using kV imaging is presented. Visi-coil segmentation in each kV image is performed on one marker at a time via fast marching method which requires user input of the endpoints. Initially, a 3D model was extracted by thresholding CT images and is used here as reference. The reference 3D model...
For the limits of the symmetrical structure and uncontrollability in current cranial microstructure modeling, a biomimetic modeling approach based on micro-CT technology is proposed in this paper. At the beginning, the natural cranial sample is scanned by micro-CT technology and reconstructed using reverse engineering. Then through the study of the reconstructed sample, it is found that the cranial...
The two phase numerical models applied for resolving turbid density current have developed recently, while the inter phase forces of the usual two-fluid model only include the viscous drag. Based on the analysis of the motion and forces of a small single particle (dp=0.01mm∼0.09mm) in the uniform flow field obtained from the dynamic equation, it was found that the proportion of the Basset force was...
A kinds of feature using in content-based 3D model retrieval is ray-based feature. There is much ray/mesh intersection. A fast method combining with space distribution is proposed in this paper, and experiments show the improving effective.
A virtual experiment system for metal creep performance testing is built by virtual reality modeling language (VRML). The structure, function and design principles of the system are described and its implementation procedure is also discussed. The key development process, including object modeling, 3D scene building, VRML connecting to the real-time database, design of interactive virtual 3D scene...
A virtual lab system for material mechanical performance testing is developed by virtual reality modeling language (VRML). The structure, function and design principles of the system are described and its implementation procedure is also discussed. Taking the tensile test for example, the authors provide a feasible solution to realize a platform of complex interactive actions by Visual Basic 2005...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.