• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.287-289
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• 2014

자동차와 IT간 융합에 대한 연구가 진행되면서 운전자에게 친숙한 자동차 시스템에 대한 많은 솔루션 및 기술들이 개발되고 있다. 운전자의 졸음 및 상태를 측정하기 위한 영상 및 다양한 센서정보 획득 기술은 운전자로 하여금 보다 더 안전한 운전 지침을 제공할 수 있으며, 자동차의 상태를 확인할 수 있는 CAN 정보를 통해 현재 주행 중인 차량의 상태를 실시간으로 점검할 수 있는 연구도 진행되고 있다. 본 논문에서는 운전자의 상태 정보(MJPEG 영상 데이터)와 차량 정보(CAN 정보)를 융합하여 전송할 수 있는 모듈을 설계 해본다.

• Journal of Korea Multimedia Society
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• v.8 no.12
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• pp.1649-1657
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• 2005

In this paper, a fast implementation of JPEG is discussed and its application to multimedia service is presented for mobile wireless internet. A fast JPEG player is developed based on several fast algorithms for mobile handset. In the color transformation, RCT is adopted instead of ICT for JPEG source. For the most time-consuming DCT part, the binDCT can reduce the decoding time. In upsampling and RGB conversion, the transformation from YCbCr to RGB 16 bit is made at one time. In some parts, assembly language is applied for high-speed. Also, an implementation of multimedia in mobile handset is described using MJPEG (Motion JPEG) and QCELP(Qualcomm Code Excited Linear Prediction Coding). MJPEG and QCELP are used for video and sound, which are synchronized in handset. For the play of MJPEG, the decoder is implemented as a S/W upon the MSM 5500 baseband chip using the fast JPEG decoder. For the play of QCELP, the embedded QCELP player in handset is used. The implemented multimedia player has a fast speed preserving the image quality.

• Journal of Institute of Control, Robotics and Systems
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• v.19 no.1
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• pp.65-71
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• 2013

In this work, new smart phone based moving target detection is proposed. In order to implement the task, methods of real time image transmission from network camera, motion detecting algorithm and its effective implementation are also addressed. The network camera transfers image data by MJPEG format which contains various information such as data and IP address, and the smart phone separates the image data received through a WiFi module. Later, the image data is converted to a Bitmap image format, and with the help of the embedded OpenCV library on a smart phone and algorithm, it was found that the moving object was identified effectively in terms of real time monitoring and detection.

• Journal of Internet Computing and Services
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• v.12 no.4
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• pp.45-50
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• 2011

In this paper, the encoding time delay of FH/TDD(Frequency Hopping/Time Division Duplex) based Motion JPEG image compression CODEC is analyzed for radio video transmissions of multi-camera systems in a vehicle. And, Synchronized connection of minimum channel collision is designed with synchronized shift and access according to channel status for Motion JPEG based FH/TDD multiple access.

• Journal of Internet Computing and Services
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• v.16 no.1
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• pp.1-8
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• 2015

Ultra-wide-angle wireless endoscopes are demonstrated in this paper. The endoscope is composed of an ultra-wide-angle camera module and wireless transmission module. A lens unit with the ultra-wide FOV of 162 degrees is designed and manufactured. The lens, image sensor, and camera processor unit are packaged together in a $3{\times}3{\times}9-cm3$ case. The wireless transmission modules are implemented based on UWB- and WiFi-based platform, respectively. The UWB-based module can transmit HD video to a computer in resolution of $2048{\times}1536$ (QXGA) and the frame rate of 15 fps in MJPEG compression mode. The maximum data transfer rate reaches 41.2 Mbps. The FOV and the resolution of the endoscope is comparable to a medical-grade endoscope. The FOV and resolution is ~3X and 16X higher than that of a commercial high-performance WiFi endoscope, respectively. The WiFi-based module streams out video to a smart device with th maximum date transfer rate of 1.5 Mbps at the resolution of $640{\times}480$ (VGA) and the frame rate of 30 fps in MJPEG compression mode. The implemented components show the feasibility of cheap medical-grade wireless electronic endoscopes, which can be effectively used in u-healthcare, emergency treatment, home-healthcare, remote diagnosis, etc.

• Proceedings of the IEEK Conference
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• 2003.07d
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• pp.1653-1656
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• 2003

In this paper, we implemented a web-based communication system using Motion JPEG and RTP. MJPEG compression method is used for compression of the image in order to film and transmit the moving image information in the real time, and the RTP(Real-Time Transport Protocol) which differs from the existing TCP and UDP is used for the data transmission.

• Proceedings of the IEEK Conference
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• 2009.05a
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• pp.178-181
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• 2009

본 논문에서는 선박용 항해정보기록장치의 개발을 위해 필요한 요구사항을 만족할 수 있는 기능을 갖추고, 향후 여러 가지 부가 기능이 쉽게 추갇힐 수 있는 구조를 갖도록 WnCE O/S 기반 ARM embedded 시스템용 플랫폼을 설계하였고, 주요 기능 중 영상 정보 압축 및 저장 회로를 구현하여 기능을 검증하였다.

• Journal of Advanced Navigation Technology
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• v.19 no.5
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• pp.417-422
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• 2015

A service size of the IoT environment is determined by the number of sensors. The number of sensors increase means increases the amount of data generated by the IoT environment. There are studies to reliably operate a network for research and operational dynamic buffer for data when network congestion control congestion in the network environment. There are also studies of the stream data that has been processed in the connectionless network environment. In this study, we propose a sensor gateway for processing big data of the IoT environment. For this, review the RESTful for designing a sensor middleware, and apply the double-buffer algorithm to process the stream data efficiently. Finally, it generates a big data traffic using the MJpeg stream that is based on the HTTP protocol over TCP to evaluate the proposed system, with open source media player VLC using the image received and compare the throughput performance.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.397-399
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• 2002

최근 무인 감시 시스템 분야에서 리눅스 기반 DVR(Digital Video Recording)시스템의 사용이 늘어나고 있다. DVR시스템은 기존의 아날로그 비디오영상 기록을 대체하여, 카메라에서 입력받은 아날로그 신호를 디지털화(MPEG또는 MJPEG)된 영상을 하드디스크에 저장하는 방법으로 작동하는 주기적으로 빈번한 하드디스크의 쓰기 작업을 수행한다. 또 기록되는 내용의 특성상 높은 신뢰도가 요구된다. 따라서 저장장치의 신뢰도가 중요하며, 만일의 사태에 발생할 수 있는 시스템 고장에도 저장된 정보의 손실을 최소화해야 한다. 저널링 파일시스템은 이러한 요구사항에 적합한 기능을 갖추고 있으며 최근 사용범위가 넓어지고 있다. 본 논문에서는 리눅스 시스템에서 널리 사용되는 4가지 저널링 파일시스템의 상대적인 읽기, 쓰기 및 복구 성능을 비교 평가하고 이를 바탕으로 고 신뢰도의 DVR시스템에 요구되는 적절한 저널링 파일시스템을 제안한다.

• Journal of KIISE:Computer Systems and Theory
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• v.35 no.9_10
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• pp.485-496
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• 2008

As the complexity of SoC (System-on-Chip) design increases dramatically. traditional system performance analysis and verification methods based on RTL (Register Transfer Level) are no more valid for increasing time-to-market pressure. Therefore a new design methodology is desperately required for system verification in early design stages. and hardware software (HW-SW) cosimulation at TLM (Transaction Level Modeling) level has been researched widely for solving this problem. However, most of HW-SW cosimulators support few restricted ion levels only, which makes it difficult to integrate HW-SW cosimulators with different ion levels. To overcome this difficulty, this paper proposes a multipurpose framework for HW SW cosimulation to provide systematic SoC design flow starting from software application design. It supports various design techniques flexibly for each design step, and various HW-SW cosimulators. Since a platform design is possible independently of ion levels and description languages, it allows us to generate simulation models with various ion levels. We verified the proposed framework to model a commercial SoC platform based on an ARM9 processor. It was also proved that this framework could be used for the performance optimization of an MJPEG example up to 44% successfully.