917 research outputs found
Assisting to Sketch Unskilled People with Fixed and Interactive Virtual Templates
No full textThis work presents a study of performance improvement of unskilled people to drawn simple sketches. We have assisted the unskilled people when drawn using a haptic interface which acts as a virtual guide taking advantage of its force feedback capabilities. In the first part of the study, an application has been developed to extract fixed templates from image files; the application extract the principal edges in the images to build output trajectories (templates) that are used by haptic interface controller, after that, the user can "fill" the virtual templates with the assistance of the force feedback capabilities of the interface. Based on the obtained results for fixed templates, a second application was developed; the user can generate interactive templates indicating where he/she desires to put a geometrical template (circle, line or arc) inside the haptic interface's workplace; once that the position of the template is defined, the interface shows its position graphically and then user can fill it assisted by the haptic interface force feedback
Autonomous System of Inspection and Control for Aluminium Fuel Injectors
No full text10th International Conference on Mechatronics Technolog
Real-Time Gesture Recognition, Evaluation and Feed-Forward Correction of a Multimodal Tai-Chi Platform
No full textThis paper presents a multimodal system capable to understand and correct in real-time the movements of Tai-Chi students through the integration of audio-visual-tactile technologies. This platform acts like a virtual teacher that transfers the knowledge of five Tai-Chi movements using feed-back stimuli to compensate the errors committed by a user during the performance of the gesture. The fundamental components of this multimodal interface are the gesture recognition system (using k-means clustering, Probabilistic Neural Networks (PNN) and Finite State Machines (FSM)) and the real-time descriptor of motion which is used to compute and qualify the actual movements performed by the student respect to the movements performed by the master, obtaining several feedbacks and compensating this movement in real-time varying audio-visualtactile parameters of different devices. The experiments of this multimodal platform have confirmed that the quality of the movements performed by the students is improved significantly
A wireless Bluetooth Dataglove based on a novel goniometric sensors
No full textIn this paper the design and construction of a novel wireless Dataglove based on new flexible goniometric sensor technology is described. The device is characterized by a low cost and rugged construction and no requires calibration before its use. Indeed, the sensors used are purely goniometric, so they are not sensible to dimensions of the user's hand. The Dataglove can measure the angular displacement of the fingers hand using 11 sensors, each sensor has a resolution of 0.2 degrees, with 3 degree of accuracy in the worst case. The communication between the Dataglove and its computer Host is carried out using a 2,4 gigahertz wireless Bluetooth radio protocol, in a guaranteed range up to 10 meters with a refresh rate of 100 Hz
Haptic Rendering of Sharp Objects Using Lateral Forces
No full textAchieving realistic rendering of thin and spatially sharp objects (needles, for example) is an important open problem in computer haptics. Intrinsic mechanical properties of users, such as limb inertia, as well as mechanical and bandwidth limitations in haptic interfaces make this a very challenging problem. A successful rendering algorithm should also provide stable contact with a haptic virtual object. Here, perceptual illusions have been used to overcome some of these limitations to render objects with perceived sharp features. The feasibility of the approach was tested using a haptics-to-vision matching task. Results suggest that lateral-force-based illusory shapes can be used to render sharp objects, while also providing stable contact during virtual object exploratio
The Haptic Desktop: a novel 2D multimodal device
No full textAs computing gets embedded into our everyday lives and moves from PCs to wide varieties of devices, we need new and flexible ways to interact with technology. Recently, the appearance of multimodal systems has been recognized to offer richer user experiences by combining different natural input modes, i.e., speech, touch, pen, hand gestures, etc.. in a coordinated manner with multimedia system outputs. As a new generation of multimodal systems begins to define itself, one dominant theme is the integration and synchronization requirements for combining different modes strategically into whole systems; where we can distinguish basically three modalities: visual, auditive, and tactile (physiology of senses). In order to provide a broader range of signal integrations, actually limited by the conventional input devices of computers, it becomes necessary to ensure that these interfaces interact in a manner akin to the way human interacts in real environments. Therefore, The design and integration of a novel multimodal device developed at PERCRO is described. This multimodal device, named Haptic Desktop, has been designed to replace the conventional input devices used for accessing the resources of computers. Furthermore, to assure the usability of the interface so that operators can extract efficiently the principal features of each perceptual channel from the device, the graphical visualization has been integrated to the haptic system on a single desktop to satisfy the coherence and co-location designing issues
Haptic Desktop: The Virtual Designer
No full textThe present paper describes the conceptual and technical design of a new multimodal device named Haptic Desktop System (HDS), which can assist the user in designing/sketching tasks and act as a virtual guide through its force feedback capabilities. The Haptic Desktop System fully integrates proprioceptive, visual, audio and haptic functionalities, into a desk minimizing the visual interference of the physical components. In the proposed approach classic input devices (i.e. keyboard and mouse) have been replaced by new features integrated within audio and haptic. Such features allow commanding and rendering natural force stimuli in a manner, which is completely coherent and co-located with respect to the visual information. The new features of the HDS are designed to reduce considerably the mental load from users during interaction operation
Development of a 3D Real Time Gesture Recognition Methodology for Virtual Environment Control
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