• Title/Summary/Keyword: Image Sensor Module

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A Study on the Development of Zigbee Wireless Image Transmission and Monitoring System (지그비 무선 이미지 전송 및 모니터링 시스템 개발에 대한 연구)

  • Roh, Jae-sung;Kim, Sang-il;Oh, Kyu-tae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.05a
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    • pp.631-634
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    • 2009
  • Recent advances in wireless communication, electronics, MEMS device, sensor and battery technology have made it possible to manufacture low-cost, low-power, multi-function tiny sensor nodes. A large number of tiny sensor nodes form sensor network through wireless communication. Sensor networks represent a significant improvement over traditional sensors, research on Zigbee wireless image transmission has been a topic in industrial and scientific fields. In this paper, we design a Zigbee wireless image sensor node and multimedia monitoring server system. It consists of embedded processor, memory, CMOS image sensor, image acquisition and processing unit, Zigbee RF module, power supply unit and remote monitoring server system. In the future, we will further improve our Zigbee wireless image sensor node and monitoring server system. Besides, energy-efficient Zigbee wireless image transmission protocol and interworking with mobile network will be our work focus.

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Performance Analysis of Spatial Multiplexing in MIMO Based Visible Light Communication System

  • Mondal, Ratan Kumar;Saha, Nirzhar;Jang, Yeong Min
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38C no.9
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    • pp.797-801
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    • 2013
  • Visible light communication (VLC) is a rapidly growing area of research and applications, due to the potential and predicted high efficiency of bandwidth. One of the key challenges in VLC technology is the choice of devices which are going to be deployed VLC features. Smartphone rationally uses the most widely deployed visible light sensor i.e. image sensor in camera, which could be used to receive the intensity modulated data. Image sensor based VLC system would be the most deployable scenario but initially the capacity was not much attractive compared with photodetector based VLC system. Here, the spatial multiplexing is proposed in MIMO based VLC system to increase the system capacity by utilizing the property of spatial separation of optical light sources in smartphone's camera module. The active pixels of imaging plane act as the multiple receivers which could be able to use on MIMO spatial multiplexing to enhance the system performance.

The Developement of Small 360° Oral Scanner Lens Module (소형 360° 구강 스캐너 렌즈 모듈 개발)

  • Kwak, Dong-Hoon;Lee, Sun-Gu;Lee, Seung-Ho
    • Journal of IKEEE
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    • v.22 no.3
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    • pp.858-861
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    • 2018
  • In this paper, we propose the development of a small $360^{\circ}$ oral scanner lens module. The proposed small $360^{\circ}$ oral scanner lens module consists of a small $360^{\circ}$ high resolution(4MegaPixel) lens optical system, a 15mm image sensor unit, and a small $360^{\circ}$ mouth scanner lens external shape. A small $360^{\circ}$ high resolution lens optical system produces a total of nine lenses, the outer diameter of the lens not less than 15mm for use by children through the ages of adulthood. Light drawn by a small $360^{\circ}$ high resolution lens optical system is $90^{\circ}$ flexion so that image images are delivered to image sensors. The 15mm image sensor unit sends the converted value to the ISP(Image Signal Processor) of the embedded board after an image array through the column and the row address of the image sensor. The small $360^{\circ}$ mouth scanner lens outer shape was designed to fix the race to the developed lens. Results from authorized testing agencies to assess the performance of proposed small $360^{\circ}$ oral scanner lens modules, The optical resolving power of $360^{\circ}$ lens was more than 30% at 150 cycles/mm, $360^{\circ}$ lens angle was $360^{\circ}$ in vertical direction, $42^{\circ}{\sim}85^{\circ}$ in vertical direction, and lens distortion rate was 5% or less. It produced the same result as the world's highest level.

Design of Automatic Assembly & Evaluation System for Phone Camera Module (폰 카메라 모듈 자동 조립.평가시스템 설계)

  • Song J.Y.;Lee C.W.;Ha T.W.;Jung Y.W.;Kim Y.G.;Lee M.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.71-72
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    • 2006
  • In this study, automatic assembly and evaluation system fer phone camera module is conceptually designed. The designed core(Auto focus & UV curing, Image Test) equipments adopts a clustering mechanism and compactible structure using index table for minimum tact time. Using a ball screw actuator and absolute encoder in each axis, we can verifies the repeatability and position accuracy of system within ${\pm}3{\mu}m$. In result of simulation test, the proposed system is expected up to 30% in productivity than manual operation.

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Development of a Satellite Image Preprocessing System for Obtaining 3-D Positional Information -Focused on KOMPSAT and SPOT Imagery- (3차원 위치정보를 취득하기 위한 위성영상처리 시스템 개발 - KOMPSAT 및 SPOT영상을 중심으로 -)

  • 유환희;김동규;진경혁;우해인
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.19 no.3
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    • pp.291-300
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    • 2001
  • In this paper, we developed a Satellite Image Processing System for obtaining 3-D positional information which is composed of five process modules. As a procedure of them, the Data Process module is the procedure that reads and processes the header file to generate data files. and then calculates orbital parameters and sensor attitudes for obtaining of 3-D positional information with them. The 3D Process module is to calculate 3-D positional information and the Dialog Process module is to correct the time of image frame center using the single image or stereo images for implementing the 3D Process module. We expect to obtain 3-D positional information with the header file and minimum GCPs(1∼2 points) using this system efficiently and economically in comparison with existing commercial software packages.

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Design of Ball Bearing Type OIS Actuator for Mobile Camera Module (모바일 카메라 모듈용 볼베어링 방식 OIS 액추에이터 설계)

  • Song, Myeong-Gyu;Son, Dong-Hun;Park, No-Cheol;Park, Kyoung-Su;Park, Young-Pil;Lim, Soo-Cheol
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.4
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    • pp.361-372
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    • 2010
  • Optical image stabilization is a technique to compensate the image blurring caused by some vibrations of camera at the exposure time. Pitching and yawing of camera are sensitive to the image quality so they are usually compensated by optical image stabilization. Corresponding pitching and yawing of a camera, a lens or the image sensor is translated in two-axis direction and then the optical path of camera is adjusted. In this paper, two-axis OIS actuator for mobile camera module is suggested and designed. The actuator is a voice-coil actuator that uses the electromagnetic force of voice-coil to make compensation motions. And ball bearing is used to reduce friction force. Magnetic attractive force between magnets and yokes acts as a preload and magnet springs. Prototype actuator is fabricated to measure the friction force and to verify the feasibility of the OIS actuator with ball bearing. At last, the actuator is improved in consideration of driving force and friction force. Design of experiments is used for designing the actuator.

RT-WISN(Real Time-Wireless Image Sensor Network) based on 802.15.4 (802.15.4기반의 RT-WISN(Real Time-Wireless Image Sensor Network))

  • Lim, Hee-sung;Lee, Kang-whan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.05a
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    • pp.287-290
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    • 2009
  • 무선 통신 기술과 하드웨어의 발전으로 인해 무선 센서 네트워크를 위한 센서 노드들은 저전력화 및 소형화되었고, 사용 목적에 따라 많은 연구가 진행되고 있다. 최근 들어서는 온도나 가속도 등의 간단한 정보뿐만 아니라 이미지를 센싱할 수 있는 초소형 카메라 등을 이용한 멀티미디어 센서 네트워크에 대한 연구도 활발히 이루어지고 있다. 이미지 센싱에 있어서는 CCD Sensor에 비해 적은 전력을 소모하고 빠른 전송에 적합한 CMOS Sensor가 최근의 연구에 이용되고 있다. 이러한 추세에서 실시간의 데이터 검출을 위한 센서와 네트워크의 기능이 통합된 프로세서 구조의 기능이 요구되고 있다. 기존의 무선 이미지 전송 기술을 살펴보면 범용성 제어의 사용으로 데이터의 전송 처리를 위한 대역폭이 제한되고, 내부 메모리 또한 적은 용량으로 제한되어 있다. 한 예로 JPEG으로 압축된 이미지라도 데이터의 크기가 수 Kbytes에 이르기 때문에 전체 데이터를 한 번에 전송받지 못해 전송 속도나 패킷 정확도에 있어 효율이 떨어지게 된다. 따라서 실시간의 데이터의 전송에는 부족한 면이 있다. 본 논문에서는 CMOS Sensor Module을 이용하여 RT-WISN을 구성하였다. 구성된 센서 네트워크를 통하여 Peer to Peer에서 이미지의 데이터 크기에 따른 전송 시간을 측정하고 RT-WISN이 실시간 전송에 적합함을 보인다.

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A Study on the Design of IoT-based Thermal Sensor and Video Sensor Integrated Surveillance Equipment (IoT 기반 열상 센서와 영상 센서 일체형 감시 장비 설계에 관한 연구)

  • Lee, Yun-Min;Shin, Jin-Seob
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.19 no.6
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    • pp.9-13
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    • 2019
  • In this paper, IoT based thermal sensor data and image sensor integrated environmental monitoring system for ship, and it is the monitoring system which can process and transmit the Full HD IP camera image and thermal data transmitted from the thermal module for processing and transmitting, and the viewer S/W is to be developed which provides in real time the information for actual surrounding temperature together with the image, and enables fire prediction which was impossible in the case of the existing equipment by estimating the temperature change as the thermal image is added to the image camera, and saves and analyzes all data while receiving the temperature data and image signal transmitted from the integrated thermal sensor environmental monitoring equipment for ship and displaying them as 2D on the monitoring system.

Design of an Efficient VLSI Architecture and Verification using FPGA-implementation for HMM(Hidden Markov Model)-based Robust and Real-time Lip Reading (HMM(Hidden Markov Model) 기반의 견고한 실시간 립리딩을 위한 효율적인 VLSI 구조 설계 및 FPGA 구현을 이용한 검증)

  • Lee Chi-Geun;Kim Myung-Hun;Lee Sang-Seol;Jung Sung-Tae
    • Journal of the Korea Society of Computer and Information
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    • v.11 no.2 s.40
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    • pp.159-167
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    • 2006
  • Lipreading has been suggested as one of the methods to improve the performance of speech recognition in noisy environment. However, existing methods are developed and implemented only in software. This paper suggests a hardware design for real-time lipreading. For real-time processing and feasible implementation, we decompose the lipreading system into three parts; image acquisition module, feature vector extraction module, and recognition module. Image acquisition module capture input image by using CMOS image sensor. The feature vector extraction module extracts feature vector from the input image by using parallel block matching algorithm. The parallel block matching algorithm is coded and simulated for FPGA circuit. Recognition module uses HMM based recognition algorithm. The recognition algorithm is coded and simulated by using DSP chip. The simulation results show that a real-time lipreading system can be implemented in hardware.

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