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Osteoarthritis has become a very rapidly spreading disorder of bones and joints among old people and young athletes indulging in sports such as soccer, hockey, etc. Injuries of the knee like tears in the meniscus can be seen very commonly in young athletes as well as the aged people. The Computer-Aided Diagnosis (CAD) systems help to a large extent and can play a major role in their detection. In...
In this paper we introduce a large-scale hand pose dataset, collected using a novel capture method. Existing datasets are either generated synthetically or captured using depth sensors: synthetic datasets exhibit a certain level of appearance difference from real depth images, and real datasets are limited in quantity and coverage, mainly due to the difficulty to annotate them. We propose a tracking...
We present a technique for semi-automatically super-deforming 3D character models. Super deformation is a unique style of exaggeration, often seen in Japanese animation and manga, to enhance characters' cute appearances. Specifically, super-deformed (SD) characters are chubby with stubby limbs and oversized heads. Given a reference SD model with a rig and a target character model, our method automatically...
In this paper, a new approach for 3D skeleton-based human motion recognition is discussed. First, we opted to represent the movement as a set of body joints trajectories. Those trajectories are then converted into ropes histograms. The motion records are obtained using the Kinect motion sensor. The classification phase consists in comparing those histograms with ropes histograms of a set of reference...
Human action recognition is currently a hot topic research domain including a variety of applications such as human HMI, rehabilitation and surveillance. The majority of existing approaches are based on the skeleton. They utilize either the joint locations or the joint angles in order to present a human skeleton. This study introduce a novel framework, which allows compact representation, quick comparison...
A snake-like robot is a hyper-redundant robot. It has flexible movement ability and high stability with low center of gravity. It is very suitable for environment detection in the rugged road or narrow space. In this paper, a 16-DOFs snake robot is composed. It has ten 2-DOFs modular spherical-shape joints. The joints are arranged as the structure of "(Roll-Pitch)-(Roll-Pitch)-", where "(Roll-Pitch)"...
The sesamoid bones of feet are quite small but they play very important roles in regulating pressure. In this study, 9 male wrestlers from Guangdong Greco-Roman wrestling team served as the subjects. CT scanning image of feet and data have been used to reconstruct the three-dimensional structures of feet, based on which the investigation and measurements of the sesamoid bones and supernumerary bones...
Recently, the synthesis of 3D dynamic expressions has become an important concern in computer graphics, facial recognition, etc. In this study, we propose a regression based joint subspace learning method for the automatic synthesis of 3D dynamic expression images. This method synthesizes 3D dynamic expression images from a single 2D facial image. We use two subspaces (the view subspace and the frame...
Rheumatoid arthritis destroys joints of the body like erosion in bones which intern may cause deformity and ankylosis in the later stage of the disease. At the beginning of this disease mainly the joints of hand and wrist are affected making hand radiograph analysis very important. Lately manual JSW measurement in hand X-ray digital radiograph of Arthritis patients were in use but it has disadvantages...
Today, the rapid advance of additive manufacturing, namely 3D printing, gives options and capabilities to simplify the fabrication of three-dimensional complex structures. In fact, such technology brings a real rupture comparing to conventional technologies in terms of design and manufacturing. Taking those advantages, this paper presents the design and the fabrication of a monolithic pivot articulation...
Dexterous continuum manipulators (DCMs) offer great potential for increasing instrument reach in minimally-invasive surgical procedures. We previously designed and fabricated a tendon driven DCM with a large instrument channel and evenly distributed compliant joints for minimally-invasive skull base surgery and the treatment of osteolysis during hip revision surgery. The evenly distributed compliant...
Due to the weak boundary, narrow or even disappeared joint space and varying topology in challenging CT, accurate segmentation of the femur from hip joint is still a difficult task. To address this problem, the proposed method combines anatomical information of relative location of bone tissues and neighboring slices to predict a statistical model for Joint space identification. A novel idea in this...
Applications, such as construction monitoring and planning for renovations, require the accurate recovery of existing conditions of structures. Many types of infrastructure are primarily comprised of arbitrarily-shaped thin structures (e.g., Truss bridges, steel frame buildings under construction, and transmission towers), which existing automatic modeling methods are incapable of handling. To address...
We propose a method to generate animations using video-based mesh sequences of elementary movements of a shape. New motions that satisfy high-level user-specified constraints are built by recombining and interpolating the frames in the observed mesh sequences. The interest of video based meshes is to provide real full shape information and to enable therefore realistic shape animations. A resulting...
In recent times there is a prevalence in amputations in the developing world due to lack of proper medical treatment of diseases & injuries sustained in natural disasters or war; creating a need for an optimal solution that is technically sound and is affordable. This paper discusses the available solutions in the market and then proposes a new design for prosthetic hands, incorporating the morphological...
We show how time ordering effects in single photon frequency conversion (FC) can be revealed by using the fact that the joint conversion amplitude in FC is a nonlinear function of the pump electric field.
As a perhaps unintended consequence of their design, soft actuators typically store significant elastic energy as they expand under fluid pressure. Certain applications rely on a limited power budget. For example, we are interested in transmitting body power from a less impaired joint to assist in generating motions of an impaired joint. Thus stored elastic energy is not useful in our application...
With the advancement of minimally invasive surgery, there has been increasing interest from both industry and academia in developing flexible serpentine manipulators for surgical robotic systems. Due to internal friction and external disturbance when interacting with complex environment, position and shape of the flexile manipulator cannot be estimated solely by kinematic models. Hence, shape tracking...
The autonomous motor skill learning is crucial for the humanoid robot to adapt to various tasks in complex environments and develop human-like behaviors. In this paper a method of autonomously learning arm movements for target reaching is proposed. To model the dynamics of arm joint trajectories during reaching, the dynamical movement primitives (DMP) model is employed. Based on the DMP representation,...
Gravity balancing has great significance in many rehabilitation applications and one example is in minimizing the resistance of lifting a patient's upper limb due to its own weight. As compared to commonly used active method in exoskeleton, passive weight compensation offers many other advantages such as elimination of motors which reduces the overall load acting on the patient. However, the torque...
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