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Expansion of Smartwatch Touch Interface from Touchscreen to Around Device Interface Using Infrared Line Image Sensors.

Lim SC, Shin J, Kim SC, Park J - Sensors (Basel) (2015)

Bottom Line: However, the small form factor of a smartwatch limits the available interactive surface area.For complete touch-sensing solution, a gyroscope installed in the smartwatch is used to read the wrist gestures.Our system not only affords a novel experience for smartwatch users, but also provides a basis for developing other useful interfaces.

View Article: PubMed Central - PubMed

Affiliation: Device & System Research Center, Samsung Advanced Institute of Technology, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Korea. soochul.lim@samsung.com.

ABSTRACT
Touchscreen interaction has become a fundamental means of controlling mobile phones and smartwatches. However, the small form factor of a smartwatch limits the available interactive surface area. To overcome this limitation, we propose the expansion of the touch region of the screen to the back of the user's hand. We developed a touch module for sensing the touched finger position on the back of the hand using infrared (IR) line image sensors, based on the calibrated IR intensity and the maximum intensity region of an IR array. For complete touch-sensing solution, a gyroscope installed in the smartwatch is used to read the wrist gestures. The gyroscope incorporates a dynamic time warping gesture recognition algorithm for eliminating unintended touch inputs during the free motion of the wrist while wearing the smartwatch. The prototype of the developed sensing module was implemented in a commercial smartwatch, and it was confirmed that the sensed positional information of the finger when it was used to touch the back of the hand could be used to control the smartwatch graphical user interface. Our system not only affords a novel experience for smartwatch users, but also provides a basis for developing other useful interfaces.

No MeSH data available.


(a) Prototype smartwatch; (b) side view of prototype smartwatch showing the line image sensor and IR emitter; (c) components of the prototype sensor module, including IR line image sensor and emitter.
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sensors-15-16642-f002: (a) Prototype smartwatch; (b) side view of prototype smartwatch showing the line image sensor and IR emitter; (c) components of the prototype sensor module, including IR line image sensor and emitter.

Mentions: Figure 1 illustrates the interaction method, wherein a finger is used to touch the back of the hand. Two IR emitters and sensors located on one side of the smartwatch are used to sense the position touched by the finger. We integrated an IR emitter and optical sensor in the side of a Samsung Galaxy Gear smartwatch. Figure 2 shows the prototype smartwatch and the module used to sense the finger-touched position on the back of the hand. Sensors with lenses were placed in the middle of one side of the smartwatch, and two emitters were placed on the right and left of the lens, respectively, to cover the back of the hand (Figure 2b). Figure 2c shows the components of the prototype sensor module. Two commercially available IR line image sensors and a 128 × 1 array photo detector (TSL 1401, AMS, Unterpremstaetten, Austria) are used to measure the position of the finger and its gesture by detecting the light emitted from two IR light-emitting diodes (LED, SFH-4250, OSRAM, Munich, Germany) and that reflected by the finger. We used wide-angle IR LEDs to cover a large interaction area within a short distance. The short-distance interaction reduces the LED power consumption compared to typical middle- or long-range time-of-flight measurement devices. To eliminate external light, we used an IR band-pass filter with a range of 850 ± 10 nm. An aspheric lens was installed and focused on the object to widen the viewing angle within a short distance. A gyro sensor embedded in the Samsung Galaxy Gear is used.


Expansion of Smartwatch Touch Interface from Touchscreen to Around Device Interface Using Infrared Line Image Sensors.

Lim SC, Shin J, Kim SC, Park J - Sensors (Basel) (2015)

(a) Prototype smartwatch; (b) side view of prototype smartwatch showing the line image sensor and IR emitter; (c) components of the prototype sensor module, including IR line image sensor and emitter.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541898&req=5

sensors-15-16642-f002: (a) Prototype smartwatch; (b) side view of prototype smartwatch showing the line image sensor and IR emitter; (c) components of the prototype sensor module, including IR line image sensor and emitter.
Mentions: Figure 1 illustrates the interaction method, wherein a finger is used to touch the back of the hand. Two IR emitters and sensors located on one side of the smartwatch are used to sense the position touched by the finger. We integrated an IR emitter and optical sensor in the side of a Samsung Galaxy Gear smartwatch. Figure 2 shows the prototype smartwatch and the module used to sense the finger-touched position on the back of the hand. Sensors with lenses were placed in the middle of one side of the smartwatch, and two emitters were placed on the right and left of the lens, respectively, to cover the back of the hand (Figure 2b). Figure 2c shows the components of the prototype sensor module. Two commercially available IR line image sensors and a 128 × 1 array photo detector (TSL 1401, AMS, Unterpremstaetten, Austria) are used to measure the position of the finger and its gesture by detecting the light emitted from two IR light-emitting diodes (LED, SFH-4250, OSRAM, Munich, Germany) and that reflected by the finger. We used wide-angle IR LEDs to cover a large interaction area within a short distance. The short-distance interaction reduces the LED power consumption compared to typical middle- or long-range time-of-flight measurement devices. To eliminate external light, we used an IR band-pass filter with a range of 850 ± 10 nm. An aspheric lens was installed and focused on the object to widen the viewing angle within a short distance. A gyro sensor embedded in the Samsung Galaxy Gear is used.

Bottom Line: However, the small form factor of a smartwatch limits the available interactive surface area.For complete touch-sensing solution, a gyroscope installed in the smartwatch is used to read the wrist gestures.Our system not only affords a novel experience for smartwatch users, but also provides a basis for developing other useful interfaces.

View Article: PubMed Central - PubMed

Affiliation: Device & System Research Center, Samsung Advanced Institute of Technology, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Korea. soochul.lim@samsung.com.

ABSTRACT
Touchscreen interaction has become a fundamental means of controlling mobile phones and smartwatches. However, the small form factor of a smartwatch limits the available interactive surface area. To overcome this limitation, we propose the expansion of the touch region of the screen to the back of the user's hand. We developed a touch module for sensing the touched finger position on the back of the hand using infrared (IR) line image sensors, based on the calibrated IR intensity and the maximum intensity region of an IR array. For complete touch-sensing solution, a gyroscope installed in the smartwatch is used to read the wrist gestures. The gyroscope incorporates a dynamic time warping gesture recognition algorithm for eliminating unintended touch inputs during the free motion of the wrist while wearing the smartwatch. The prototype of the developed sensing module was implemented in a commercial smartwatch, and it was confirmed that the sensed positional information of the finger when it was used to touch the back of the hand could be used to control the smartwatch graphical user interface. Our system not only affords a novel experience for smartwatch users, but also provides a basis for developing other useful interfaces.

No MeSH data available.