Browsing by Author "Su, Yu-Jie"

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Compact and High Resolution Virtual Mouse Using Lens Array and Light Sensor
(2016-01-01)
Qin, Zong
;
Chang, Yu-Cheng
;
Su, Yu-Jie
;
Huang, Yi-Pai
;
Shieh, Han-Ping David
Virtual mouse based on IR source, lens array and light sensor was designed and implemented. Optical architecture including lens amount, lens pitch, baseline length, sensor length, lens-sensor gap, focal length etc. was carefully designed to achieve low detective error, high resolution, and simultaneously, compact system volume. System volume is 3.1mm (thickness) x 4.5mm (length) x 2, which is much smaller than that of camera-based device. Relative detective error of 0.41mm and minimum resolution of 26ppi were verified in experiments, so that it can replace conventional touchpad/touchscreen. If system thickness is eased to 20mm, resolution higher than 200ppi can be achieved to replace real mouse.
High-resolution and compact virtual mouse using lens arrays to capture finger images on light sensors
(2017-11-01)
Qin, Zong
;
Chang, Yu-Cheng
;
Su, Yu-Jie
;
Huang, Yi-Pai
;
Shieh, Han-Ping D.
To realize a finger positioning device, as called "virtual mouse," to replace a touchpad, touchscreen, or even real mouse, current positioning technologies cannot achieve a sufficient resolution, a compact volume, and a simple detection algorithm simultaneously. For this problem, using a light-emitting diode source, two lens arrays, and two light sensors, we design and implement a virtual mouse prototype. The optical architecture is carefully determined for a compact volume, a sufficient resolution, and a high detection accuracy. Corresponding to a compact system volume of 3.1 mm (thickness) x 4.5 mm (length) x 2, a theoretical resolution higher than 25 pixels per inch (ppi) can be obtained over a working area of 10 cm x 10 cm. Experiments are also implemented, in which a mean detection error of 0.24 cm that corresponds to approximately two distinguishable points, and a minimal resolution of 26 ppi over the whole working area are verified. If the system thickness is relaxed to 25 mm, a resolution higher than 200 ppi can be achieved. The proposed virtual mouse, which is simple enough and potential to be extended for three-dimensional position detection, can be integrated with a flat panel display to achieve a compact display application that can interact with users.