• Journal of Korea Multimedia Society
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• v.12 no.5
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• pp.699-707
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• 2009

Recently, while 3D sports game increases, the research that it recognizes the operation of the real user actively progresses. Most of all, the research about the golf is active. In this paper, the camera acquiring in a high-speed multi-exposure image measures the flight data of the golf ball through the image processing. While photographing, the high-speed camera, using this system, exposes an image at regular intervals. And line scan camera checks whether the golf ball passed or not. After the location information of the calculated golf ball calculates a speed and a direction by using the physical formula, it applies the golf simulation. After, this system is possible the measurement of the physical element of the spherical object.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.102-105
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• 2015

본 논문에서는 멀티미디어 및 수학 관련 알고리즘 분야에서 각광 받고 있는 CUDA(Compute Unified Device Architecture) 기법을 실시간 동영상 자막 처리에 이용 한다. 실시간 고화질 동영상 자막 처리의 낮은 속도를 개선하기 위한 방법 제안으로 써, 이의 함수 구성을 제안한다. 기존의 자막 처리 방식에서는 하나의 코어만을 이용하였다. 이 방법 대신에 CUDA 를 적용 함으로써, 더 많은 코어를 이용해 실시간 자막 처리의 지각적인 성능을 향상하였다. 삽입하고자 하는 자막에 대해 비트맵 이미지를 형성하고, 이의 정보를 처리한다. Intel $Core^{TM}$ i7-4710 MQ, GTX870 환경에서 실험하였으며, 실험 결과 C code 만으로 연산을 한 것 보다 CUDA code 가 약 88% 정도의 속도 향상이 있음을 보였다.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.168-172
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• 2009

Recently, while 3D sports game increases, the research that it recognizes the operation of the real user actively progresses. Most of all, the research about the golf is active. In this paper, the image acquiring in a high-speed CCD camera measures the flight data of the golf ball through the image processing. While photographing, the high-speed camera, using this system, exposes an image at regular intervals. And line scan camera checks whether the golf ball passed or not. After the location information of the calculated golf ball calculates a speed and a direction by using the physical formula, it applies the golf simulation.

• Proceedings of the Optical Society of Korea Conference
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• 2000.02a
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• pp.60-61
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• 2000

홀로그래픽 데이터 저장 장치(holographic data storage)는 1960년대에 이미 아이디어가 출현하였고, 1990년대에 들어서 SLM(spatial light modulator)과 CCD(charge coupled device) 등 관련 기술의 발달과 함께 향후 늘어날 대용량 저장 장치 시장에 대한 전망 등에 힘입어 주목받기 시작하였다. 홀로그래픽 데이터 저장 장치의 중요한 장점은 대용량의 정보를 고속으로 처리할 수 있고, 특히 페이지 단위로는 병렬 접근이 가능하다는 것인데, 이를 위해서 반드시 해결되어야 할 것이 픽셀 매치(pixel-match)이다. (중략)

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.628-631
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• 2017

An experimental study of the combustion characteristics according to the equivalence ratio of hydrocarbon fuel/air premixture excited by ultrasonic standing wave are presented. The image of the propagating flame was acquired using a high-speed camera, and the combustion characteristics of each fuel were closely observed through image processing. it was conformed that ultrasonic standing wave has been found to stimulate the combustion reaction in the stoichiometric ratio.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.12 no.3
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• pp.186-191
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• 2019

In this paper, we propose a implementation approach of the high-speed feature extraction algorithm. The proposed method is based on the block type classification algorithm which reduces the computation time when target macro block is divided to smooth block type that has no image features. It is quantitatively identified that occurs at 29.5% of the total image using 200 standard test images with $64{\times}64$ macro block size. This means that within a standard test image containing various image information, 29.5% can reduce the complexity of the operation. When the proposed approach is applied to the Canny edge detection, the required latency of the edge detection can be completely eliminated, such as 2D derivative filter, gradient magnitude/direction computation, non-maximal suppression, adaptive threshold calculation, hysteresis thresholding. Also, it is expected that operation time of the feature detection can be reduced by applying block type classification algorithm to various feature extraction algorithms in this way.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11a
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• pp.41-44
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• 2003

본 논문에서는 저작권 보호를 위하여 칼라 영상에서의 하다마드 변환을 이용한 워터마킹 기법을 제안한다. 하다마드 변환은 간단한 행렬값으로 사용할 수 있고, 고속변환이 가능하여 영상적용에 용이한 변환이다. 제안한 알고리즘은 RGB 영상을 YIQ 영역으로 전환한 후, Y 영상을 $8{\times}8$의 크기를 갖는 블록으로 나누어서 $H_{3}$ 행렬값을 사용하여 하다마드 변환을 한 후, PN-Code를 이용하여 좌표를 결정하여 워터마킹 알고리즘에 의하여 워터마크를 삽입한다. 실험결과 압축이나 이미지 영상처리 공격에 대해서 강인하게 워터마크가 추출되었고, 추출된 워터마크의 왜곡정도가 양호하여 시각적으로인지가 가능하였다.

• Journal of IKEEE
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• v.20 no.3
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• pp.209-219
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• 2016

SVM is a machine learning method used for image processing. It is well known for its high classification performance. We have to perform multiple MAC operations in order to use SVM for image classification. However, if the resolution of the target image or the number of classification cases increases, the execution time of SVM also increases, which makes it difficult to be performed in real-time applications. In this paper, we propose an hardware architecture which enables real-time applications using SVM classification. We used parallel architecture to simultaneously calculate MAC operations, and also designed the system for several feature extractors for compatibility. RBF kernel was used for hardware implemenation, and the exponent calculation formular included in the kernel was modified to enable fixed point modelling. Experimental results for the system, when implemented in Xilinx ZC-706 evaluation board, show that it can process 60.46 fps for $1360{\times}800$ resolution at 100MHz clock frequency.

• Journal of Convergence for Information Technology
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• v.10 no.2
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• pp.32-38
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• 2020

In this paper, we analyze the modulation scheme for high speed transmission in visible light communication system, and study non-orthogonal multiplexing, dimming level and transmission power ratio. Conventional visible light communication has a disadvantage in that it is difficult to multi-transmit to increase the transmission speed. Multi-transmission technique is necessary for high-speed transmission at the transmitter. Since general visible light communication has a limitation in multiple transmission, various researches for high-speed transmission have been conducted. In order to solve this problem, this paper proposes a multiple modulation scheme for high-speed visible light communication using non-orthogonal multiplex transmission scheme and a future research direction.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.4
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• pp.454-460
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• 2016

Unlike conventional visible light communications (VLC) adopting photo detectors (PD), optical camera communications (OCC) employs cameras in detecting the transmitted data. Especially, the data rate of OCC can be enhanced by using the principle of rolling-shutter, which is the operating scheme of a CMOS image sensor. In this study, we consider a novel OCC system for high-speed real time video processing to transmit high speed data from LED and to acquire image utilizing rolling-shutter effect of CMOS image sensor. Also, we demonstrate the improved performance of proposed system using a test-bed.