Development of a Fingertip Position-Sensing System using LC Resonated Markers

Yabukami, S.; Ogasawara, Katsuhiko; Saitoh, H.; Hashi, S.; Toyoda, M.; Okazaki, Y.; Arai, Ken Ichi

doi:10.3379/jmsjmag.31.439

Cited by 4 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yakukami et al built a large driving coil and an array of pickup coils to track five LC-resonated markers worn on the fingertips [29,30]. Liang et al used an array of 192 Hall effect sensors to track the 2D positions of permanent magnets [21].…”

Section: Magnetic Field Sensingmentioning

confidence: 99%

Finexus

Chen

Patel

Keller

2016

Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems

129

View full text Add to dashboard Cite

With the resurgence of head-mounted displays for virtual reality, users need new input devices that can accurately track their hands and fingers in motion. We introduce Finexus, a multipoint tracking system using magnetic field sensing. By instrumenting the fingertips with electromagnets, the system can track fine fingertip movements in real time using only four magnetic sensors. To keep the system robust to noise, we operate each electromagnet at a different frequency and leverage bandpass filters to distinguish signals attributed to individual sensing points. We develop a novel algorithm to efficiently calculate the 3D positions of multiple electromagnets from corresponding field strengths. In our evaluation, we report an average accuracy of 1.33 mm, as compared to results from an optical tracker. Our real-time implementation shows Finexus is applicable to a wide variety of human input tasks, such as writing in the air.

show abstract

Section: Magnetic Field Sensingmentioning

confidence: 99%

Finexus

Chen

Patel

Keller

2016

Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems

129

View full text Add to dashboard Cite

show abstract

“…However, it provides only incomplete 5-DOF tracking, since its inherent dead-angle problem (discussed in detail later) makes tracking reliability uncertain; consequently, its usage remains quite limited. [Yabukami et al 2007] achieved a speed of 20 fps for a single LC coil; however, the prototype has to use one computer for each LC coil. Therefore, we designed a system based on this principle to provide high performance for dexterous 3D motion tracking and interaction sensing, with reasonable hardware.…”

Section: Magnetic Systemsmentioning

confidence: 99%

“…We also propose an improved algorithm for the inverse problem. In [Yabukami et al 2007], 5-DOF of each LC coil is computed, where the initial value in the inverse problem is first set as the origin, and the computation result of each time instant becomes the initial value of the next time instant. Since this iteration is not corrupted as soon as the LC coil becomes unavailable, our approach focuses on how to get a better initial value.…”

Section: Parallel Computation Structurementioning

confidence: 99%

“…Since the most critical feature of our system is stability, we compared our approach and the single LC coil approach of [Yabukami et al 2007]. We measured the flux of the three coils in a marker in real time when a user moves a marker spatially by hand and then computed their positions with both our approach and that of [Yabukami et al 2004] (i.e., only inverse problem computation).…”

Section: Reliabilitymentioning

confidence: 99%

See 1 more Smart Citation

Im6d

et al. 2015

View full text Add to dashboard Cite

We propose IM6D, a novel real-time magnetic motion-tracking system using multiple identifiable, tiny, lightweight, wireless and occlusion-free markers. It provides reasonable accuracy and update rates and an appropriate working space for dexterous 3D interaction. Our system follows a novel electromagnetic induction principle to externally excite wireless LC coils and uses an externally located pickup coil array to track each of the LC coils with 5-DOF. We apply this principle to design a practical motion-tracking system using multiple markers with 6-DOF and to achieve reliable tracking with reasonable speed. We also solved the principle's inherent dead-angle problem. Based on this method, we simulated the configuration of parameters for designing a system with scalability for dexterous 3D motion. We implemented an actual system and applied a parallel computation structure to increase the tracking speed. We also built some examples to show how well our system works for actual situations.

show abstract

Position Sensing System of Nasogastric Tube Using Long LC Resonated Marker

Sato¹,

Hayasaka²,

Yabukami³

et al. 2011

J. Magn. Soc. Jpn.

View full text Add to dashboard Cite

A position-detecting system made up of a nasogastric tube using a wireless LC resonated magnetic marker has been developed. The marker, consisting of an inductor and a capacitor without battery or electric wires, was installed inside a commercial nasogastric tube. A positioning accuracy within 7.1mm was obtained when the marker inside the tube was parallel translation to 100mm. The marker inside the tube was roughly tracked in the esophagus and trachea of a human model.

show abstract

Development of a Fingertip Position-Sensing System using LC Resonated Markers

Cited by 4 publications

References 5 publications

Finexus

Finexus

Im6d

Position Sensing System of Nasogastric Tube Using Long LC Resonated Marker

Contact Info

Product

Resources

About