Micro-optical system based 3D imaging for full HD depth image capturing

Park, Yong-Hwa; Cho, Yong Chul; You, Jong-Bum; Park, Chang-Young; Yoon, Hee-Sun; Lee, Sang-Hun; Kwon, Jiseok; Lee, Seung-Wan

doi:10.1117/12.905946

Cited by 10 publications

(17 citation statements)

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“…Extraction of phase delay is the key process to identify TOF of each pixel. The phase delay of each pixel can be identified with the homodyne mixing technique developed by this group [1][2][3][16][17][18].…”

Section: Time Of Flight Principlementioning

confidence: 99%

“…As the continuation of this group's works [1][2][3], this paper's approach stems from the high speed modulation of IR light [12][13][14][15]. High resolution of depth image up to full HD is obtained utilizing suggested novel image modulator that has small form factor compared to other technologies.…”

Section: Introductionmentioning

confidence: 98%

“…In this paper, a novel TOF method using a MOEMS-based high speed light modulator so called 'optical shutter' is presented for high resolution depth image capturing. Based on the previous works [1][2][3], this paper focuses on the robustness of the shutter operation in terms of ambient temperature variation and interference of external light such as sunlight at the outdoor condition.…”

Section: Introductionmentioning

confidence: 99%

“…Since variety of depth sensors have been introduced [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], the depth sensing becomes one of highly interested technology to differentiate future IT devices targeting to 3-dimentional detection of users and 3D modeling of interested objects. Among existing depth sensing technologies, structured light method recently well known as 'Kinect' [4][5] and TOF (Time-Of-Flight) sensors based on the silicon image sensor (CCD, CIS) technology [6][7][8][9][10][11] are *yongh.park@samsung.com; phone 82 10 3326 7337; fax 82 31 280 9459; www.sait.samsung.co.kr released or close to market release.…”

Section: Introductionmentioning

confidence: 99%

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A robust design and fabrication of micromachined electro-absorptive optical modulator for 3D imaging

et al. 2014

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A time-of-flight (TOF) based three dimensional (3D) image capturing system and its enhanced optical modulating device are presented. The 3D image capturing system includes 850nm IR emitter (typically compact Laser diodes) and high speed image modulator, so called optical shutter. The optical shutter consists of multi-layered optical resonance cavity and electro-absorptive layers. The optical shutter is a solid-state controllable filter which modulates the IR image to extract the phase delay due to TOF of the emitting IR light. This presentation especially addresses robustness issues and solutions when operated under practical environments such as ambient temperature variation and existence of strong ambient light (e.g. outdoors). The wavelength of laser diode varies substantially depending on the ambient temperature, which degrades the modulation efficiency. To get a robust operation, the bandwidth of transmittance of the optical shutter is drastically improved with a novel coupled Fabry-Perot resonance cavity design to come up with the wavelength variation of the laser diode. Also, to suppress the interference of solar irradiance to IR source signal, a novel driving scheme is applied, in which IR light and optical shutter modulation duties are timely localized, i. e. 'bursted'.Suggested novel optical shutter design and burst driving scheme enable capturing of a full HD resolution of depth image under the realistic usage environments, which so far tackle the commercialization of TOF cameras. Design, fabrication, and evaluation of the optical shutter; and, 3D capturing system prototype, image test results are presented.

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Section: Time Of Flight Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A robust design and fabrication of micromachined electro-absorptive optical modulator for 3D imaging

et al. 2014

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Among the existing depth-capturing technologies, structured light method (recently well known as Kinect) 2,3 and TOF (time of flight) sensors based on the silicon image sensor [charge-couple device (CCD), complementary metal oxide semiconductor (CMOS) image sensor (CIS)] technology [4][5][6][7][8][9] are commercialized or close to market release. The structured light method basically utilizes the well-known triangulation principle: depth is calculated by analyzing the image of a particular pattern on the object projected from the projector.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional imaging using fast micromachined electro-absorptive shutter

Park

Cho

You

et al. 2013

J. Micro/Nanolith. MEMS MOEMS

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Abstract. A 20-MHz switching high-speed light-modulating device for three-dimensional (3-D) image capturing and its system prototype are presented. For 3-D image capturing, the system utilizes a time-of-flight (TOF) principle by means of a 20-MHz high-speed micromachined electroabsorptive modulator, the so-called optical shutter. The high-speed modulation is obtained by utilizing the electro-absorption mechanism of the multilayer structure, which has an optical resonance cavity and lightabsorption epilayers grown by metal organic chemical vapor deposition process. The optical shutter device is specially designed to have small resistor-capacitor-time constant to get the high-speed modulation. The optical shutter is positioned in front of a standard high-resolution complementary metal oxide semiconductor image sensor. The optical shutter modulates the incoming infrared image to acquire the depth image. The suggested novel optical shutter device enables capturing of a full high resolution-depth image, which has been limited to video graphics array (VGA) by previous depth-capturing technologies. The suggested 3-D image sensing device can have a crucial impact on 3-D-related business such as 3-D cameras, gesture recognition, user interfaces, and 3-D displays. This paper presents micro-opto-electro-mechanical systemsbased optical shutter design, fabrication, characterization, 3-D camera system prototype, and image evaluation. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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