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For able-bodied people within the art and design discipline, access to Computer Aided Design (CAD) and visual graphic interface is a well-defined iterative process. However for non-sighted people or people with impaired vision, this is a difficult process to facilitate. Often this issue excludes and/or limits access for people with vision impairments to fully utilise CAD systems, web interface, and...
Palpation is a physical examination technique where objects, e.g., organs or body parts, are touched with fingers to determine their size, shape, consistency and location. Many medical procedures utilize palpation as a supplementary interaction technique and it can be therefore considered as an essential basic method. However, palpation is mostly neglected in medical training simulators, with the...
Soft tissue palpation plays an important role in diagnosing various diseases. Palpating skills are tedious to learn due to the difficulty of describing the sense of touch. Because of its interactive nature, a virtual reality (VR) training system embedding with real-time soft-tissue models may be helpful to teach such skills to medical residents. Studies show that such a VR system impacts human perception...
During the recording of a haptic interaction session both position and force-feedback data have to be saved. This work proposes two novel methods for haptic data compression which allow to keep the reconstruction errors during playback below human perception thresholds. Supported by well-known results from psychophysics, the first proposed non-iterative method determines the least amount of samples...
In the present paper, we describe a virtual reality application developed for the study of unilateral spatial neglect, a post-stroke neurological disorder that results in failure to respond to stimuli presented contralaterally to the damaged hemisphere. Recently, it has been proposed that patients with unilateral spatial neglect experience sensorimotor decorrelation in the affected space. Consequently,...
Touch sensation called ??haptic?? interface attracts increasing attentions from many researchers as a way for providing a new interaction modality. Integrating the haptic interface with traditional audio-visual communication channels has a potential ability to create more sophisticated human computer interaction (HCI) method and application systems. One big hurdle for utilizing the haptic interface...
In this paper, a haptically guided teleoperation system which is based on virtual attractive force is introduced. It is well known that haptic feedback can be used to enhance performance of teleoperation systems. When the end-effector is in contact with environment, force/torque sensors can be used to provide real haptic information to operators. Although it is not necessary to provide haptic information...
We present an approach to realize an e-learning system targeted at teaching handwritten characters. In addition to realistic 3D graphics rendering of written characters, our system provides a haptic channel to intuitively learn an instructorpsilas fine motor skills through the sense of touch. We utilize a commercially available haptic device called PHANTOM. The proposed system implements a function...
We propose a haptic feedback system for an arm in order to obtain the sensation of stiffness and the boundary of virtual objects. Powerful haptic displays are large and heavy, interfering with movement in the virtual environment. Here, we focus on an illusion called pseudo-haptic feedback, which provides the results of haptic feedback using only visual impressions. Since pseudo-haptic feedback is...
This paper presents a novel method of contour reconstruction from dexel data solving the shape anomalies for the complex geometry in virtual sculpting. Grouping and traversing processes are developed to find connectivity between dexels along every two adjacent rays. After traveling through all the rays on one slice, sub-boundaries are connected into full boundaries which are desired contours. The...
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