A Haptic Interaction Technique for Volume Images Based on Gradient Diffusion

2005 ◽  
Author(s):  
E. Vidholm ◽  
I. Nystrom
Keyword(s):  
Haptic Interaction ◽  
Interaction Technique ◽  
Gradient Diffusion

Multi-mode haptic interaction technique and its application

2017 ◽  
Vol 47 (9) ◽  
pp. 1183-1197 ◽  
Author(s):  
Aiguo SONG ◽  
Huanhuan QIN ◽  
Lei TIAN ◽  
Dejing NI
Keyword(s):  
Haptic Interaction ◽  
Interaction Technique ◽  
Multi Mode

Extract of Polyphenols from Pomegranate Seed and its Antioxidant Activity in Vitro

2020 ◽  
Vol 71 (6) ◽  
pp. 492-499
Author(s):  
Le-Bin Yin ◽  
Dan Liu ◽  
Ai-Lian Yang ◽  
Cong Liao ◽  
Ping He ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Room Temperature ◽  
Dpph Radical ◽  
Interaction Technique ◽  
Alcohol Extract ◽  
Effective Components ◽  
Pomegranate Seed ◽  
Pomegranate Seeds ◽  
Scavenging Rates

In this study, the pomegranate seeds were treated by micro-cutting assisted interaction technique. The effective components were extracted from pomegranate seeds with 95% ethanol at room temperature, and their antioxidant capacity in vitro was determined. The results showed that the scavenging rates of DPPH radical, superoxide anion radical, hydroxyl radical and lipid peroxidation were 70.97, 51.95, 52.85, and 80.62%, respectively. The antioxidation ability of alcohol extract of pomegranate seed was studied in order to provide theoretical basis for developing more value of pomegranate seed in the future.

Modifying Perceived Size of a Handled Object through Hand Image Deformation

2013 ◽  
Vol 22 (3) ◽  
pp. 255-270 ◽  
Author(s):  
Yuki Ban ◽  
Takuji Narumi ◽  
Tomohiro Tanikawa ◽  
Michitaka Hirose
Keyword(s):  
Visual Representation ◽  
Shape Perception ◽  
Size Perception ◽  
Visual Object ◽  
Display System ◽  
Haptic Interaction ◽  
Image Deformation ◽  
Virtual Objects ◽  
The Difference ◽  
Hand Image

In this study, we aim to construct a perception-based shape display system to provide users with the sensation of touching virtual objects of varying shapes using only a simple mechanism. Thus far, we have proved that identified curved surface shapes or edge angles can be modified by displacing the visual representation of the user's hand. However, using this method, we cannot emulate multifinger touch, because of spatial unconformity. To solve this problem, we focus on modifying the identification of shapes using two fingers by deforming the visual representation of the user's hand. We devised a video see-through system that enables us to change the perceived shape of an object that a user is touching visually. The visual representation of the user's hand is deformed as if the user were handling a visual object; however, the user is actually handling an object of a different shape. Using this system, we conducted two experiments to investigate the effects of visuo-haptic interaction and evaluate its effectiveness. One is an investigation on the modification of size perception to confirm that the fingers did not stroke the shape but only touched it statically. The other is an investigation on the modification of shape perception for confirming that the fingers dynamically stroked the surface of the shape. The results of these experiments show that the perceived sizes of objects handled using a thumb and other finger(s) could be modified if the difference between the size of physical and visual stimuli was in the −40% to 35% range. In addition, we found that the algorithm can create an effect of shape perception modification when users stroke the shape with multiple fingers.

Bi-manual Haptic-based Periodontal Simulation with Finger Support and Vibrotactile Feedback

2021 ◽  
Vol 17 (1) ◽  
pp. 1-17
Author(s):  
Said Chehabeddine ◽  
Muhammad Hassan Jamil ◽  
Wanjoo Park ◽  
Dianne L. Sefo ◽  
Peter M. Loomer ◽  
...  
Keyword(s):  
New York ◽  
Medical Training ◽  
Dental Students ◽  
New York University ◽  
Haptic Interaction ◽  
Vibrotactile Feedback ◽  
Quantitative Evidence ◽  
Support Mechanism ◽  
Probing Depth ◽  
Group 2

The rise of virtual reality and haptic technologies has created exciting new applications in medical training and education. In a dental simulation, haptic technology can create the illusion of substances (teeth, gingiva, bone, etc.) by providing interaction forces within a simulated virtual world of the mouth. In this article, a haptic periodontal training simulation system, named Haptodont, is developed and evaluated for simulating periodontal probing. Thirty-two faculty members from New York University College of Dentistry were recruited and divided into three groups to evaluate three fundamental functionalities: Group 1 evaluated bi-manual 3 Degrees of Freedome (DoF) haptic interaction, Group 2 evaluated bi-manual 3 DoF haptic interaction with a finger support mechanism, and Group 3 evaluated bi-manual 3 DoF haptic interaction with finger support mechanism and vibrotactile feedback. The probe and mirror interactions were simulated with the Geomagic Touch haptic device whereas the finger support was implemented using the Novint Falcon device. The three groups conducted two probing tasks: healthy gingiva scenario with no pockets (2- to 3-mm depth) and periodontitis scenario with deep pockets (4- to 8-mm depth). Results demonstrated that experts performed comparably to clinical settings in terms of probing depth error (within 0.3 to 0.6 mm) and probing forces (less than 0.5 N). Furthermore, the finger support mechanism significantly improved the probing accuracy for periodontitis condition in the lingual region. The argument that probing the lingual region is more difficult than the buccal region is supported by quantitative evidence (significantly higher probing depth error and probing force). Further research is planned to improve the usability of the finger support, integrate the Haptodont system into the pre-clinical curriculum, and evaluate the Haptodont system with dental students as a learning tool.

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