Browsing by Author "Chen, Chien-Yue"

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A Creative 3D Game Platform Interacted with Laser Beam
(2013)
Chang, Sheng-Hsiung
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Chen, Chien-Yue
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Lin, Bor-Shyh
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Wu, Pei-Jung
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光電工程學系
In this study, a 3D display and interactive laser technology are integrated to develop an interface system with virtual touch and to build up a laser interactive 3D game platform.
A hybrid temporal and spatial speckle-suppression method for laser displays
(2013-12-16)
Deng, Qing-Long
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Lin, Bor-Shyh
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Wu, Pei-Jung
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Chiu, Kuan-Yao
;
Fan, Ping-Lin
We propose a system that reduces laser display speckles by vibrating the light pipe. A small displacement of the light pipe appears to allow the total reflection of the laser, thereby resulting in a homogenized speckle field that changes with time. In this case, the speckle interference generated by the pattern projected by the laser through the light pipe destroys the spatial homogenization of the laser beams when the light pipe is vibrated. Moreover, when the light pipe begins the sequential vibration, the phases and paths of the beams are changed after the beams traverse the light pipe. Consequently, temporal speckle wavefront superposition can homogenize the luminous intensity distribution of the speckle pattern. This process reduces the speckle contrast to less than 4% while maintaining a luminous intensity of greater than 70%. (C) 2013 Optical Society of America
Binary blazed grating based on autostereoscopic display mechanism
(2012-03-01)
Chen, Chien-Yue
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Deng, Qing-Long
;
Chiang, Donyau
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Chang, Yao-Ru
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光電系統研究所
The diffractive optical element blazed grating is proposed as the beam splitter for autostereoscopic displays in this study. With Lithographie Galvanoformung Abformung and inductively coupled plasma reactive-ion etching, a four-level blazed grating structure is produced. Moreover, highly translucent polydimethylsiloxane is transformed into symmetrical four-level blazed grating films. The experimental results show that the film can successfully transmit the left and the right images to the accurate positions, and the diffraction efficiency is 70.4% and the contrast ratio is above 80%, presenting the original stereoscopic image without it being affected by brightness and crosstalk. In the experiment of stereoscopic imaging, both the left and the right images could be clearly acquired, which proves the feasibility of blazed gratings as practical for the beam splitter of autostereoscopic displays. (C) 2012 Optical Society of America
Design of a finger base-type pulse oximeter
(2016-01-01)
Lin, Bor-Shyh
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Huang, Cheng-Yang
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Chen, Chien-Yue
;
Lin, Jiun-Hung
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影像與生醫光電研究所
A pulse oximeter is a common medical instrument used for noninvasively monitoring arterial oxygen saturation (SpO(2)). Currently, the fingertip-type pulse oximeter is the prevalent type of pulse oximeter used. However, it is inconvenient for long-term monitoring, such as that under motion. In this study, a wearable and wireless finger base-type pulse oximeter was designed and implemented using the tissue optical simulation technique and the Monte Carlo method. The results revealed that a design involving placing the light source at 135 degrees-165 degrees and placing the detector at 75 degrees-90 degrees or 90 degrees-105 degrees yields the optimal conditions for measuring SpO(2). Finally, the wearable and wireless finger base-type pulse oximeter was implemented and compared with the commercial fingertip-type pulse oximeter. The experimental results showed that the proposed optimal finger base-type pulse oximeter design can facilitate precise SpO(2) measurement. (C) 2016 AIP Publishing LLC.
Design of a finger base-type pulse oximeter
(2016-01)
Lin, Bor-Shyh
;
Huang, Cheng-Yang
;
Chen, Chien-Yue
;
Lin, Jiun-Hung
;
影像與生醫光電研究所
A pulse oximeter is a common medical instrument used for noninvasively monitoring arterial oxygen saturation (SpO(2)). Currently, the fingertip-type pulse oximeter is the prevalent type of pulse oximeter used. However, it is inconvenient for long-term monitoring, such as that under motion. In this study, a wearable and wireless finger base-type pulse oximeter was designed and implemented using the tissue optical simulation technique and the Monte Carlo method. The results revealed that a design involving placing the light source at 135 degrees-165 degrees and placing the detector at 75 degrees-90 degrees or 90 degrees-105 degrees yields the optimal conditions for measuring SpO(2). Finally, the wearable and wireless finger base-type pulse oximeter was implemented and compared with the commercial fingertip-type pulse oximeter. The experimental results showed that the proposed optimal finger base-type pulse oximeter design can facilitate precise SpO(2) measurement. (C) 2016 AIP Publishing LLC.
Design of a symmetric blazed grating sheet embedded in an autostereoscopic display
(2011-09-01)
Chen, Chien-Yue
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Deng, Qing-Long
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Lin, Hui-Hsiung
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光電系統研究所
;
Institute of Photonic System
This study proposes a diffractive autostereoscopic display technology that utilizes blazed grating embedded in the liquid crystal panel to deliver a stereo image pair to both eyes. Having the diffractive red green blue beams as the color source of the panel, color filters are no longer required in this system. From the simulation analyses, not only could the brightness achieve 77.90%, but no serious chromatic aberration or cross talk appeared. (C) 2011 Optical Society of America
Design of head-mounted-display eyepiece system of liquid crystal on silicon
(2012-04-01)
Chen, Chien-Yue
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Ke, Ming-Da
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Deng, Qing-Long
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Chang, Yang-Hua
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Fan, Ping-Lin
The research is aimed at designing an optimized head-mounted-display (HMD) system equipped with two 0.26-inch Liquid Crystal on Silicon display elements for imaging. In order to form an image at a distinct-vision distance of 250 mm, the eyepiece system features 17-times magnification, a 15.63-mm focal length and a 15 degrees field of view. Using the resolution of the human eye as the evaluation standard, we analyze the diminution of aberration and the increase of modulation transfer function, giving the HMD system high resolution as the finishing touches.
Full Color Image Splitter Based on Holographic Optical Elements for Stereogram Application
(2013-08-01)
Deng, Qing-Long
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Su, Wei-Chia
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Chen, Chien-Yue
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Lin, Bor-Shyh
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Ho, Hsin-Wei
A color holographic beam splitter (CHBS) applied to an autostereoscopic display is proposed in this study. With high-stability polymer-dispersed-liquid-crystals (PDLC) being the holographic materials, holographic grating is utilized as a full-color beam splitter to split left and right field of views (FOVs) of a stereoscopic display. When CHBS is attached, the experimental results show that the correct left/right FOVs images could be successfully obtained at the preset observing distance of 25 cm. Moreover, the diffraction efficiency of the red, green and blue (RGB) left/right FOVs of the PDLC materials remained at 30.0% on average. Apparently, the brightness efficiency of the proposed CHBS stereo-displays is better than the traditional stereo-displays with a parallax barrier (22.4%). In addition, a crosstalk contrast with 95.0% indicates the crosstalk problem is almost avoided in the proposed technique.
Integral computer-generated hologram via a modified Gerchberg-Saxton algorithm
(2015-01-01)
Wu, Pei-Jung
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Chen, Chien-Yue
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Deng, Qing-Long
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Chang, Hsuan T.
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Lin, Bor-Shyh
An integral computer-generated hologram, which modulates the phase function of an object based on a modified Gerchberg-Saxton algorithm and compiles a digital cryptographic diagram with phase synthesis, is proposed in this study. When the diagram completes position demultiplexing decipherment, multi-angle elemental images can be reconstructed. Furthermore, an integral CGH with a depth of 225 mm and a visual angle of +/- 11 degrees is projected through the lens array.
MGSA-Type Computer-Generated Holography for Vision Training With Head-Mounted Display
(2014-06-01)
Deng, Qing-Long
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Lin, Bor-Shyh
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Chang, Hsuan T.
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Huang, Guan-Syun
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Chen, Chien-Yue
A computer-generated holography head-mounted display (HMD) for vision training is proposed in this study. Based on modified Gerchberg-Saxton algorithm (MGSA) to calculate the phase distribution of light wave and the position multiplexing, the images with fixation disparity or changed disparity are successfully coded as phase only function. After decryption and reconstruction, the left and the right images are transmitted to HMD for a trainee viewing the images with disparity changes and moderating the stereoacuity of both eyes, ranging from 32.24 arcsec to 2.14 arcmin. The images reconstructed with MGSA-type CGH present the relative diffraction efficiency about 86% and visibility 94%, which not only provide high-contrast image quality, and the changing disparity allows achieving the training effect.
Micro-prism type single-lens 3D aircraft telescope system
(2012-11-01)
Deng, Qing-Long
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Chen, Chien-Yue
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Cheng, Shun-Wen
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Sun, Wen-Shing
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Lin, Bor-Shyh
Based on the image payload on an Unmanned Aircraft System, this study utilizes a micro-prism array and single-lens remote camera to assess the feasibility of having two virtual cameras shoot terrain image pairs with inclined +/- 10 degrees. The software, LightTools, is applied for simulating and verifying the feasibility of the optical system. In comparison with traditional frame-type remote cameras, this study not only could acquire highly overlapped stereoscopic image pairs from different viewing angles, but could also increase the stereoscopic image pairs by two times. The system we propose obtains more stereoscopic digital terrain information than do traditional systems. (C) 2012 Elsevier B.V. All rights reserved.
Novel Noninvasive Approach for Detecting Arteriovenous Fistula Stenosis
(2014-06-01)
Wang, Hsien-Yi
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Wu, Cho-Han
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Chen, Chien-Yue
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Lin, Bor-Shyh
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影像與生醫光電研究所
Hemodialysis is the most common treatment for patients with end-stage renal disease. For hemodialysis, consistently functional vascular access must be surgically created with an anastomosis of artery and vein, referred to as an arteriovenous fistula (AVF). However, AVF dysfunction may occur over time. Angiography and Doppler ultrasound are usually used to detect the flow or the diameter of the AVF. But they require well-trained operators and are expensive, and even angiography is invasive. In this study, a noninvasive approach based on stethoscope auscultation for monitoring AVF stenosis was proposed. Here, a wireless blood flow sound recorder was designed to record blood flow sounds wirelessly. In order to effectively extract the varying feature of blood flow sounds for AVF stenosis, the 2-D feature pattern built from S-transform was also proposed as the feature in the AVF stenosis detecting algorithm. Different from other frequency-related coefficients, the feature pattern can contain the information of blood flow sounds in time and frequency domains simultaneously. Preliminary findings showed that the proposed approach can provide high-quality estimation of AVF stenosis (positive predictive value=87.84% and sensitivity = 89.24%).
Novel Wearable and Wireless Ring-Type Pulse Oximeter with Multi-Detectors
(2014-09-01)
Huang, Cheng-Yang
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Chan, Ming-Che
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Chen, Chien-Yue
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Lin, Bor-Shyh
;
影像與生醫光電研究所
The pulse oximeter is a popular instrument to monitor the arterial oxygen saturation (SPO2). Although a fingertip-type pulse oximeter is the mainstream one on the market at present, it is still inconvenient for long-term monitoring, in particular, with respect to motion. Therefore, the development of a wearable pulse oximeter, such as a finger base-type pulse oximeter, can effectively solve the above issue. However, the tissue structure of the finger base is complex, and there is lack of detailed information on the effect of the light source and detector placement on measuring SPO2. In this study, the practicability of a ring-type pulse oximeter with a multi-detector was investigated by optical human tissue simulation. The optimal design of a ring-type pulse oximeter that can provide the best efficiency of measuring SPO2 was discussed. The efficiency of ring-type pulse oximeters with a single detector and a multi-detector was also discussed. Finally, a wearable and wireless ring-type pulse oximeter was also implemented to validate the simulation results and was compared with the commercial fingertip-type pulse oximeter.
Panoramic stereo photography based on single-lens with a double-symmetric prism
(2013-04-08)
Chen, Chien-Yue
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Deng, Qing-Long
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Sun, Wen-Shing
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Cheng, Qiao-Yao
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Lin, Bor-Shyh
Different from traditional panorama stereo acquisition technique shooting with numerous cameras, this study equips a double-symmetric prism in front of a single-lens camera to acquire images from four different angles of view, and the images acquired from the cameras every 20 degrees complete a pair of panorama stereo images with vertical angle of view (+/- 16 degrees) by image-based rendering. The panorama stereo acquisition technique reduces the number of cameras by three-fourth, and the acquired images contain vertical angles of view. Moreover, the image resolution is enhanced several times of the resolution of integral photography without moire effect. (C)2013 Optical Society of America
Pulfrich autostereo display with micro-prism array
(2013-09-09)
Chen, Chien-Yue
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Ke, Ming-Da
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Deng, Qing-Long
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Siao, Jhih-Kai
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光電系統研究所
A micro-prism film, with spectral characteristics, is attached on a display panel to show images appearing with + 10 degrees similar to + 50 degrees and -10 degrees similar to-50 degrees bright regions and with a + 10 degrees similar to-10 degrees dark region. When both eyes separately receive the bright region and the dark region of an image, interocular delay would appear to generate a stereo perception. With the optical simulation software, LightTools 7.3.0, to simulate the brightness change, the light with lower brightness appears on the 0 degrees region and the light with the highest brightness appears on the +/- 10 degrees region. The optimal viewing distance of 25cm could accurately deliver the image with shading parallax to both eyes. The actual measurement of brightness presents the shading distribution, achieving the condition of binocular retinal illumination, and the angle of visibility appears on the +/- 50 degrees region, causing interocular delay so that the viewer generates the stereo perception. (C)2013 Optical Society of America
Quartz-Blazed Grating Applied on Autostereoscopic Display
(2012-08-01)
Chen, Chien-Yue
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Deng, Qing-Long
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Lin, Bor-Shyh
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Hung, Wen-Cheng
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光電系統研究所
By applying reactive ion etching (RIE) to a blazed grating on quartz substrates, the grating can be utilized as a splitter in autostereoscopic displays. Furthermore, a solution for the pattern alignment on transparent substrates is also proposed. By measuring the diffraction efficiency and crosstalk between the left and right fields of view (FOV), the capability of the element to deliver stereoscopic images is demonstrated.
Reconstruction of dynamic digital holographic image using Modified Gerchberg-Saxton Algorithm
(2012-01-01)
Huang, Guan-Syun
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Deng, Qing-Long
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Chang, Hsuan-Ting
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Hwang, Hone-Ene
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Chen, Chien-Yue
The display system of dynamic grayscale holographic movie was projected by using Modified Gerchberg-Saxton Algorithm with the original three-dimensional images. After the analysis of image quality, the output image of visibility was about 0.91 in visual area, the diffraction efficiency was about 54% and the speckle contrast was about 10%.
Reduction of speckles and distortion in projection system by using a rotating diffuser
(2012-11-01)
Chen, Chien-Yue
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Su, Wei-Chia
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Lin, Ching-Huang
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Ke, Ming-De
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Deng, Qing-Long
A head up display (HUD) with laser backlight unit has two principle problems; one is laser speckles and the other is distortion. In this study, we propose that a rotating diffuser set at the intermediate image plane of the HUD projection system can simultaneously solve these problems. The conditions of speckle reduction and de-distortion are also estimated in this paper.
Speckle reduction by combination of digital filter and optical suppression in a modified Gerchberg-Saxton algorithm computer-generated hologram
(2014-09-20)
Chen, Chien-Yue
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Deng, Qing-Long
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Wu, Pei-Jung
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Lin, Bor-Shyh
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Chang, Hsuan T.
A speckleless illuminated modified-Gerchberg-Saxton-algorithm-type computer-generated hologram, which adopts a lower frequency of the iterative algorithm and calculation time, is proposed to code a hologram with two signals and position a multiplexing phase-only function, which can reconstruct the left and the right viewing holograms on the pupillary-distance position after the decryption and still maintain the content with high contrast and definition. The reconstructed image quality presents root mean square error of 0.03, with a diffraction efficiency of 87%, and signal-to-noise ratio of 8 dB after the analysis. Furthermore, two denoising techniques for the digital filter and optical suppression are combined, in which the speckle suppression with pseudorandom phase modulation and a rotating diffuser are utilized for successfully reducing the speckle contrast, which was reduced to below 4%. The goal was to reduce visual fatigue for the viewers. (C) 2014 Optical Society of America
Study on corsstalk improvement of TN-LC parallax barrier type autostereoscopic display
(2012-01-01)
Chen, Chien-Yue
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Lin, Bor-Shyh
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Deng, Qing-Long
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Siao, Jhih-Kai
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Lin, Hao-Wei
The twisted nematic liquid crystal to replace the conventional grating on an autostereoscopic panel. This study analyzes the crosstalk effect with different widths of slit pitch of grating at different viewing distances from 30cm to 150cm. From the simulation results, the crosstalk reduces down to 3.5% at each position.