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Rigid structure-from-motion (RSfM) and non-rigid structure-from-motion (NRSfM) have long been treated in the literature as separate (different) problems. Inspired by a previous work which solved directly for 3D scene structure by factoring the relative camera poses out, we revisit the principle of “maximizing rigidity” in structure-from-motion literature, and develop a unified theory which is applicable...
The erosion of contact material is one of the critical failure mechanisms in switch devices. Thus it is important to study the characteristics of contact erosion. In this paper, a two-dimensional magnetic hydrodynamics (MHD) is established to get physical characteristics of the molten pool in cathode. Gas dynamics and statistical methods are then used for the calculation of the vaporization rates...
Used to describe the propagation of the electrical potential in heterogeneous cardiac tissue, the FitzHugh-Nagumo monodomain model has attracted numerous attentions to be analyzed. Due to the irregular profile of the cardiac tissue, there has been limitations for the numerical solution on the considered regular domains or approximate irregular domains, where the analytic solution could not be obtained...
Artists who create 3D models usually rely on the traditional method of direct mesh manipulation using basic operations such as translation, rotation, scaling, and extrusion. In some cases, creating a model in this manner requires performing many repetitive and precise actions, which makes a fully manual approach suboptimal. This paper explores an alternative concept of 3D modeling using scripts, which...
This paper addresses the problem of grasping unknown objects with a humanoid robot. Conventional approaches fail when the shape, dimension or pose of the objects are missing. We propose a novel approach in which the grasping problem is solved by modeling the object and the volume graspable by the hand with superquadric functions. The object model is computed in real-time using stereo vision. Pose...
A de-cubing process are important in the Laminated Object Manufacturing (LOM) technique, creates a physical model directly from 3D CAD model without mold and dies by using laminated material. The de-cubing process is to assign shape of waste material into generally small square shape that can be easily remove in order to reduce time and avoid prototype damages. The adaptive de-cubing process applies...
In the era of modern computing based environment, the process of design is conceptualized, implemented and tested in a close loop integrating different modules of design, manufacturing and usages. In this regard, this paper presents a computing based design model for the design of a ‘Pneumatic Driven Variable Buoyancy System (PDVBS)’ for ‘Autonomous Underwater Vehicles (AUVs)’. The presented design...
With the emergence of a large number of 3D models, retrieving 3D models is becoming more and more important. It is well known that 3D shape features suffer from sparse sampling and view-based features have the ambiguity of different views for a 3D model. In this paper we present a method which combines 3D shape features with view-based features of 3D model to retrieve models. Moreover, according to...
Soft tissue deformation is an important part of virtual surgery simulation systems. Real-time and realistic simulation of soft tissue deformation in humans is crucial for virtual surgery simulation systems. Soft tissue deformation simulation mainly applies a linear and viscoelastic biomechanical model, however, this model loses numerous properties of soft tissue. As a consequence, a realistic representation...
Geometric accuracy control is crucial to fulfill the promise of additive manufacturing (AM). The control of the out-of-plane deformation has been a challenge task for AM due to its complex underlying physics. We have been establishing a generic and prescriptive methodology to represent, predict and compensate 3D geometric deformation of AM built products based on a limited number of test cases. Built...
The study of oil droplet spreading behaviors after oblique collision with wall is a foundation work for better understanding the complex two-phase flow in an aero engine bearing chamber. Considering the limitations in the present study, a three dimension symmetrical numerical calculation model using Volume of Fluid(VOF)method and an experimental setup about oil droplet-solid surface oblique collision...
In this work, we exploit 3D Constrained Local Model (CLM) for facial landmark detection. Our approach integrates the geometric information of 3D face scans. The fast increase demand of 3D data invite to develop 3D image processing methods for many applications and especially for automatic landmark detection. The new step in this paper is the introduction of mesh histogram of gradients (meshHOG) as...
In early stage of the design process, modelling is a crucial phase because it allows the designer estimating the device performance before fabrication. Very often, this phase is performed with use of FEM simulator that is usually time consuming. In many cases, especially when simple structures are used, the use of analytical model is more convenient. In this paper we present an analytical model of...
In virtual reality, particularly in gaming applications, the hands used are generic representations that move using a controller. An individualized hand representation can create a more immersive experience. If the hands being controlled by the user are similar with his, the interaction with the virtual world is more effective and meaningful. We present a parametric 3D human hand model from Leap Motion...
In this paper, an approach for matching of primitive shapes detected from point clouds, to boundary representations of primitive shapes contained in CAD models of objects/workpieces is presented. The primary target application is object detection and pose estimation from noisy RGBD sensor data. This approach can also be used to determine incomplete object poses, including those of symmetrical objects...
A challenge of current research concerning eye motion estimation is to estimate motion of a three-dimensional (3D) eye model from a two-dimensional (2D) eye image. This paper proposed a new method to estimate rotation angle of 3D eye model from a 2D eye image by angular orientation identification technique. Real eye movement is captured from a camera mounting on a side of a binocular. A camera focuses...
Madeup is a programming language for making things up-literally. Programmers write sequences of commands to move and turn through space, tracing out shapes with algorithms and mathematical operations. The language is designed to teach computation from a tangible, first-person perspective and help students integrate computation back into the physical world. We describe the language in general and reflect...
The present paper is concerned with study of the effects of different characteristics of the corneoscleral shell of the human eye on intraocular pressure (IOP) changes after intravitreal injections. Sensitivity analysis was performed to quantify the relative importance of material and geometrical parameters of the eyeball on the IOP elevation.
In this paper, we present a control technique to editing the fire motion with the geometry goal shape, which is designed without connection to physical parameters and physical equation solving. To fulfill this, controlling elements are extracted from the input curves conveying the target shape of fire animation. Then a force field is obtained according to these controlling elements, which would drive...
Buffer structures inside hydraulic cylinder can greatly reduce hazards of hydraulic shock, such as vibration, noise and temperature rise of oil. And they are widely used in various industries, especially when the hydraulic system has high pressure and high speed. General buffer structure is column-shape, taper-shape, inclined-shape, parabola-shape or sidestep-shape plunger piston, the shape of which...
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