• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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• pp.119-124
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• 1999

This paper presents new approach to technology pattern recognition of camera back cover and test of soldering. In real-time implementing of pattern recognition camera back cover and test of soldering, the MVB-03 vision board has been used. Image can be captured from standard CCD monochrome camera in resolutions up to 640$\times$480 pixels. Various options re available for color cameras, a synchronous camera reset, and linescan cameras. Image processing os performed using Texas Instruments TMS320C31 digital signal processors. Image display is via a standard composite video monitor and supports non-destructive color overlay. System processing is possible using c30 machine code. Application software can be written in Borland C++ or Visual C++

• Journal of Korea Multimedia Society
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• 제20권2호
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• pp.234-243
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• 2017

With the development of smartphone technologies enable photoplethysmogram (PPG) acquisition by camera and heart rate (HR) measurement. This papers presents improved algorithm to extract HR from PPG signal recorded by smartphone camera and to develop real-time PPG signal processing Android application. 400 video samples recorded by Samsung smartphone camera are imported as input data for further processing and evaluating algorithm on MATLAB. An optimized algorithm is developed and tested on Android platform with different kind of Samsung smartphones. To assess algorithm's performance, medical device Beurer BC08 is used as reference. According to related works, accuracy parameters includes 90% number of samples that has relative errors less than 5%, Person correlation (r) more than 0.9, and standard estimated error (SEE) less than 5 beats-per-minutes (bpm).

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 한국신호처리시스템학회 2001년도 하계 학술대회 논문집(KISPS SUMMER CONFERENCE 2001
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• pp.61-64
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• 2001

초저속 고압축 비디오는 고압축 부호화를 위해 주로 P-픽쳐 부호화 방법을 사용한다. P-픽쳐는 현재 프레임과 이전 프레임간의 데이터 의존성이 높기 때문에 전송시 패킷 손실이 발생할 경우 복원 영상에 심각한 화질 열화를 야기할 수가 있다. 따라서 본 논문에서 초저속 고압축 비디오 데이터에 대한 미디어내 동기화를 위해 TCP 기반 멀티스트림 생성 기법을 제안한다. 제안한 기법은 TCP 기반으로 신뢰성 있는 전송이 가능하며, 멀티 스트립을 통해 병렬 전송이 가능하므로, TCP 기반에서 네트워크 트랙픽에 의해 발생하는 지터에 민감하지 않아 최선의 서비스를 제공할 수 있다.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 한국신호처리시스템학회 2003년도 하계학술대회 논문집
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• pp.118-121
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• 2003

본 논문은 동영상 압축 부호화에 대한 표준안인 MPEG기반의 압축 비디오 stream에서［1, 2］, 질의 영상에 대한 효율적인 검색 기법을 제안한다. 비디오 검색은 높은 차원의 색인 정보를 이용하는데, 높은 차원의 data set을 색인 정보로 하여 효율적인 검색 능력을 보여주는 KD-Trees(K Dimensional-Trees)알고리즘［3］을 비디오 검색기법에 적용하고자 한다. 먼저, key frame에 PCA (Principal Component Analysis) 알고리즘［4］을 이용하여 색인 정보를 추출한 다음, 추출된 색인 정보를 KD-Trees에 적용하여 효율적인 검색을 가능하게 한다. 실험 결과, 기존의 검색 기법보다 상당한 양의 처리 시간과 메모리 공간을 줄일 수 있음을 보였다.

• IEIE Transactions on Smart Processing and Computing
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• 제6권3호
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• pp.158-167
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• 2017

Internet-based social and interactive video applications have become major constituents of the envisaged applications for next-generation multimedia networks. However, inherently dynamic network conditions, together with varying user expectations, pose many challenges for resource allocation mechanisms for such applications. Yet, in addition to addressing these challenges, service providers must also consider how to mitigate their operational costs (e.g., energy costs, equipment costs) while satisfying the end-user quality of service (QoS) expectations. This paper proposes a heuristic solution to the problem, where the energy incurred by the applications, and the monetary costs associated with the service infrastructure, are minimized while simultaneously maximizing the average end-user QoS. We evaluate the performance of the proposed solution in terms of serving probability, i.e., the likelihood of being able to allocate resources to groups of users, the computation time of the resource allocation process, and the adaptability and sensitivity to dynamic network conditions. The proposed method demonstrates improvements in serving probability of up to 27%, in comparison with greedy resource allocation schemes, and a several-orders-of-magnitude reduction in computation time, compared to the linear programming approach, which significantly reduces the service-interrupted user percentage when operating under variable network conditions.

• Journal of the Institute of Electronics Engineers of Korea CI
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• 제44권5호
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• pp.12-19
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• 2007

This paper presents an ASIP(Application Specific Instruction Set Processor) for implementation of H.264/AVC, called VSIP(Video Specific Instruction-set Processor). The proposed VSIP has novel instructions and optimized hardware architectures for specific applications, such as intra prediction, in-loop deblocking filter, integer transform, etc. Moreover, VSIP has hardware accelerators for computation intensive parts in video signal processing, such as inter prediction and entropy coding. The VSIP has much smaller area and can dramatically reduce the number of memory access compared with commercial DSP chips, which result in low power consumption. The proposed VSIP can efficiently perform in real-time video processing and it can support various profiles and standards.

• The Journal of Korean Institute of Communications and Information Sciences
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• 제24권8A호
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• pp.1259-1264
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• 1999

In this paper, the High-speed, Low-power Analog-Digital Conversion Archecture is porposed using the Pipelined archecture for High-speed conversion rate and the Successive-Approximation archecture for Low-power consumption. This archecture is the Successive-Approximation archecture using Pipelined Comparator array to change reference voltage during Holding Time. The Analog-to-Digital Converter for video processing is designed using 0.8${\mu}{\textrm}{m}$ CMOS tchnology. When an 6-bit 10MS/s Analog-to-Digital Converter is simulatined, the INL/DNL errors are $\pm$0.5/$\pm$1, respectively. The SNR is 37dB at a sampling rate of 10MHz with 100KHz sine input signal. The power consumption is 1.46mW at 10MS/s. When an 8-bit 10MS/s Analog-to Digital Converter is simulatined, the INL/DNL errors are $\pm$0.5/$\pm$1, respectively. The SNR is 41dB at a sampling rate of 100MHz with 100KHz sine input signal. The power consumption is 4.14m W at 10MS/s.

• Journal of the Institute of Convergence Signal Processing
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• 제12권1호
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• pp.33-37
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• 2011

This paper presents the frequency spectral analysis based on FFT of the infrared ray fire thermal image, it is an object to deduce the conditions for determining fire alarm through the image processing with the frequency domain. After the candidate regions are separated by using pre-defined brightness value, the fast fourier transform is performed for consecutive infrared thermal images, the frequency spectral analysis of the thermal image analyzed DC and AC frequency distribution. The fire criterion of the thermal image was presented based on the analyzed result and a practicality was confirmed through the computer simulation.

• Proceedings of the IEEK Conference
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.241-244
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• 2003

Nowadays image processing is very useful for some field of traffic applications. The one reason is we can construct the system in a low price, the other is the improvement of hardware processing power, it can be more fast to processing the data. In this study, I propose the traffic monitoring system that implement on the embedded system environment. The whole system consists of two main part, one is host controller board, the other is image processing board. The part of host controller board take charge of control the total system, interface of external environment. and OSD(On screen display). The part of image processing board takes charge of image input and output using video encoder and decoder, image classification and memory control of using FPGA, control of mouse signal. And finally, fer stable operation of host controller board, uC/OS-II operating system is ported on the board.

• Journal of the Institute of Convergence Signal Processing
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• 제5권2호
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• pp.126-131
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• 2004

Full search algorithm(FA) provides the best performance but this is usually impractical because of the large number of computations required for large search region. Fast search and conventional Boolean matching algorithms reduce computational complexity and data processing time but this algorithms have disadvantages that is difficult of implementation of hardware because of high control overhead and that is less performance than FA. This paper presents new Boolean matching algorithm, called BCBM(Bit Converted Boolean Matching). Proposed algorithm has performance closed to the FA by Boolean only block matching that may be very efficiently implemented in hardware for real time video communication. Simulation results show that the PSNR of the proposed algorithm is about 0.08㏈ loss than FA but is about 0.96∼2.02㏈ gain than fast search algorithm and conventional Boolean matching algorithm.