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This paper mainly discusses the sensing and measuring system for a hand rehabilitation robot. Through analyzing the whole system structure and rehabilitation strategies of hand rehabilitation robot, a sensing and measuring system scheme is designed. By integrating joint position sensors and force sensors, the robot can perceive the joint angle information of patient's finger and the interaction force...
Learning and then recognizing a path is a challenging task for state of the art algorithms in computer vision and robotics. In this paper, we present a new approach to visual localization along a path. Classically visual paths have been described using keyframes, single images taken at specific locations. Our method uses all the images of a path segment, Gabor-Gist and, principal component analysis...
The popularization of service robots requires that robots are not expensive and can work very well in human daily living environment. Due to lighting condition and/or cluttered background, there are false detections occasionally for landmark-based robot localization with low-cost color camera or infrared sensors. However, traditional frequently used methods, such as Extended Kalman Filter (EKF) and...
Unstructured domestic environments present a substantial challenge to effective robotic operation. Domestic environment requires service robots to deal with unexpected environment changes, novel objects, and user manipulations. We present an approach to enable service robots to actively learn high-level skills in an unstructured environment. This involves using a combination of processing environment...
In this paper, we study distributed rendezvous strategies for multiple nonholonomic wheeled mobile robots with the aim of testing their practicality on real robots. Control strategies using just bearings-only or range-only measurements are investigated. For the bearings-only case, we recall two control laws presented in our previous study. For the range-only case, we first propose rendezvous control...
It is significant to have accurate localization of surgical instruments in navigated minimally invasive surgery. Moreover, instrument tracking modules are essential for cognitive surgical robotic systems. Commercial optical trackers have been developed with sub-millimeter accuracy, but typically work only at single spectrum — either visible spectrum or infrared spectrum, which limits the sensing and...
This paper design of a state-action map for an omni-directional mobile walking support robot. The robot realizes the omni-directional movement through a differential drive control mode. The moving direction of the robot is according to the intention of the elderly. We define a state-action map to improve the control efficiency. We defined state space, action space and state transition matrix of the...
Human Machine Interaction (HMI) plays a very important role in intelligent service robot research. Traditional HMI methods such as keyboard and mouse cannot satisfy the high demands in some environments. To solve this problem, many researchers pay attention to vision-based gesture recognition research recently. This paper proposes a simple method to control the movement of a robot based on Kinect...
This paper deals with walking balance control of biped robot inspired by biological concept of sensory integration. The control system is proposed with a trajectory generator and a walking balance controller. The inverted pendulum model is used to generate a more natural and energy efficient biped gait. The walking balance controller, which includes Kalman filter and fuzzy controller, is designed...
A simple, efficient and practical obstacle avoidance strategy for miniature mobile robot in the unknown environment is presented. In this paper, a series of virtual circles are approximated and gradually form the influence region based on the information of the unknown obstacle detected by the local sensing of robot. Then the limit cycle differential equations are used to define the robot's transitional...
Human safety plays a crucial role for the symbiosis between humans and robots. Moreover, it is also important to maintain the robot's efficiency while keeping the human unharmed. With this purpose, we previously developed Asymmetric Velocity Moderation (AVM) as a reactive strategy for human safety. Nevertheless, this original AVM only considers the end-effector's movement. This may lead to overrestrictions...
Localization is one of the fundamental problems for mobile robots. Hence, there are several related works carried out for both metric and topological localization. In this paper, we present a lightweight technique for on-line robot topological localization in a known indoor environment. This approach is based on the Generalized Voronoi Diagram (GVD). The core task is to build local GVD to match against...
A frequent method for taking into account the partially observable nature of an environment in which robots interact lies in formulating the problem domain as a Partially Observable Markov Decision Process (POMDP). By having humans demonstrate how to act in this partially observable context we can leverage their prior knowledge, experience and intuition, which is difficult to encode directly in a...
Accurate force/torque (F/T) information is essentially important for a robot manipulator to regulate the contact forces and torques exerted on its tool (end-effector). For a manipulator with mounted F/T sensor, the tool and the F/T sensor are connected to the manipulator via some components, of which many parameters such as mounting errors and component's weight are unknown. As a result, the forces...
Six-axis force/torque sensor plays an important role in many fields. A novel six-axis force/torque sensor based on strain gauge was designed and optimized with design of experiments (DOE) approach and response surface methodology. In order to reduce the errors bonding strain gauges, we adopted strain distribution analysis to acquire the accurately positions. The strain compliance matrix was attained...
This paper presents a design and development of Veress Needle Insertion Force Sensing System, and a Veress Needle Insertion Robotic System for acquiring force data for soft tissue insertion. The study reports force data from veress needle insertions, measured to use in our Robot-Assisted Surgical System. The main goal of this work is to develop a virtual reality robotic surgical system which can provide...
A general framework of robot manipulation planning for door opening task is proposed in this paper. First grasp pattern, including grasp point and method for various door handles, is defined. Second door-opening pattern, including task planning and trajectory planning, is also proposed. This paper utilizes Kinect as a vision sensor to collect point cloud data of the environment. Viewpoint Feature...
The implementation of context-bound tasks at a higher level of abstraction often demands a semantic representation of the environment and the enclosed objects. A fundamental step towards the creation of rich semantic models is the abstraction of information from the raw and oftentimes unordered sensor data. In this work, we introduce a novel method for the abstraction of indoor environments as polyhedral...
Recognition of human actions using a vision based approach is a challenging task. To improve the action recognition performance, we proposed a hierarchical probabilistic model based framework which not only models the dynamics of the actions but also considers contextual constraints in terms of object/action correlation and action sequential constraints. By considering the action/object correlation,...
Focusing on the development of flexible robots for industrial and household environments, we identify intuitive teaching as the key feature and direct physical interaction and guidance as the most important interface. In the current work we introduce a multi redundant robotic assistant equipped with a touch sensitive skin around the upper- and the forearm, in order to incorporate contact forces into...
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