• 한국통신학회논문지
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• 제38C권9호
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• pp.802-812
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• 2013

캡슐 내시경 시스템은 최소 침습적 방법으로 의료진이 환자의 소화기관 검사를 수행할 수 있는 혁신적 기술로 최근 주목 받는 융합 기술이다. 일단 환자가 비타민 알약 크기의 캡슐을 삼키면, 캡슐 내 무선 또는 인체통신 모듈에 의해 전송된 영상정보를 바탕으로 의료진은 캡슐 내시경 진단 시스템을 통해 혈액 이상, 용종, 궤양, 크론병 등 다양한 질환을 진단할 수 있다. 캡슐 내시경은 기존의 케이블 내시경을 대신할 수 있는 혁신 기술이지만 정확한 병증 진단 및 분석 소요 시간 측면에서 단점을 가지고 있다. 즉, 캡슐 내시경은 캡슐내의 소형 카메라를 이용하여 6~12만 프레임의 방대한 양의 정지 영상을 촬영하기 때문에 촬영된 영상을 의료진이 확인하고 정확한 병변을 분석하는데 오랜 시간이 걸린다. 따라서 캡슐 내시경 시스템은 빠른 병변 진단을 위한 도구 및 정확한 병변 진단을 위한 의료 이미지 영상 처리가 필수 요소이다. 본 논문에서는 캡슐 내시경 시스템의 주요 제조사들을 중심으로 거의 알려져 있지 않은 소화기 영상의 빠른 병변 진단 도구에 대한 최근 경향과 정확한 병변 검출을 위한 의료 영상 처리 기술의 최신 동향을 분석하였다.

• 정보처리학회논문지B
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• 제11B권6호
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• pp.633-644
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• 2004

본 논문에서는 기존 NTSS 알고리즘을 다중해상도(MR : Multiple Resolution)기법을 이용하여 NTSS-3 레벨 알고리즘으로 제안하였다. 고속 블록정합 알고리즘은 패턴 방식에 따라 속도에 많은 영향을 미치는데 본 논문에서는 기존 NTSS의 패턴 방식과 다른 다중해상도 기법을 이용한 레벨에 따른 블록정합 알고리즘을 제안하였다. 블록 정합알고리즘에서 국부최소화 문제(Local minima problem)로 발생하는 화질 저하를 개선하기 위해 MC(Multiple Candidate)라는 다중후보를 이용하였다. 실험 결과 제안한 기법을 FS와 비교하면 16배의 탐색 속도론 나타내었고 기존 고속 블록 정합 알고리즘인 NTSS 방식에 비교 할 때 PSNR값에 있어서는 0.11-0.12(dB) 화질이 개선되었으며 속도 면에서도 0.1배 향상되었고 탐색점 대비 화질개선이 우수함을 나타내었다.

• Journal of the Optical Society of Korea
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• 제16권4호
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• pp.457-461
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• 2012

A real-time method to measure full field retardation near quarter wavelength is proposed. The circularly polarized beam passes through a sample with a large aperture. The measuring beam then goes through a quarter-wave plate and is then split by a Wollaston prism. An image with two sub-images is then detected by a high-speed image sensor. The full field retardation near quarter wavelength can be obtained in real time by processing the image. The measured retardation is independent of the fast axis angle of the sample and the fluctuation of the initial intensity. In experiments, a wedge waveplate is measured with different fast axis angle and initial intensity, and the full field retardations are acquired. The maximum and standard deviation of the full field retardation is $1.5^{\circ}$ and $0.4^{\circ}$. The validity of the method is verified.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.454-457
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• 2004

AGV for FMS must be detected an obstacle. Therefore, many studies have been advanced, and recently, the ultra sonic sensor is used for this. However, the new method has to be developed because the ultra-sonic-sensor has many problems as a noise in factory, an directional error and detection of the obstacle size. So, we study the fast stereo vision system that can give more information to obstacles for intelligent AGV system. For this, the simulated AGV system was made with two CCD cameras in front to get the stereo images, and the threshold process by color information (intensity and chromaticity) and structure stereo matching method were constructed.

• 전자공학회논문지B
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• 제31B권12호
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• pp.81-90
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• 1994

This paper proposes a motphological fast reconstructive filter (FRF) using up/down sampling techniques for reconstructive opening and closing, and a parallel structure for fast multiresolution decomposition. Compuer simulation shows that, compared with the conventional RF, the proposed FRF can reduce the processing time up to 8 times while it maintains a similar performance in reconstructed shapes. Further reduction in the decomposition time achieved by the paralellized algorithm combined with the FRF, which can be applied in areas such as defect detection, image segmentation, pattern recognition, etc.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권2호
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• pp.117-137
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• 2010

Iris recognition is a biometric technique which uses unique iris patterns between the pupil and sclera. The advantage of iris recognition lies in high recognition accuracy; however, for good performance, it requires the diameter of the iris to be greater than 200 pixels in an input image. So, a conventional iris system uses a camera with a costly and bulky zoom lens. To overcome this problem, we propose a new method to restore a low resolution iris image into a high resolution image using a single image. This study has three novelties compared to previous works: (i) To obtain a high resolution iris image, we only use a single iris image. This can solve the problems of conventional restoration methods with multiple images, which need considerable processing time for image capturing and registration. (ii) By using bilinear interpolation and a constrained least squares (CLS) filter based on the degradation model, we obtain a high resolution iris image with high recognition performance at fast speed. (iii) We select the optimized parameters of the CLS filter and degradation model according to the zoom factor of the image in terms of recognition accuracy. Experimental results showed that the accuracy of iris recognition was enhanced using the proposed method.

• 정보통신설비학회논문지
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• 제11권1호
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• pp.23-28
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• 2012

In this paper, we proposed and developed a fast and efficient real time face detection and recognition which can be run on embedded system instead of high performance desktop. In the face detection process, we detect a face by finding eye part which is one of the most salient facial features after applying various image processing methods, then in the face recognition, we finally recognize the face by comparing the current face with the prepared face database using a template matching algorithm. Also we optimized the algorithm in our system to be successfully used in the embedded system, and performed the face detection and recognition experiments on the embedded board to verify the performance. The developed method can be applied to automatic door, mobile computing environment and various robot.

• 한국정보처리학회논문지
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• 제7권6호
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• pp.1956-1963
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• 2000

In this paper, a wavelet image coding scheme exploiting the correlation of neighboring VQ indices in eh wavelet domain is proposed. the codewords in each sub-codebook are re-ordered in terms of their energies in order to increase the correlation of he indices. Then, the generated indices after VQ can be further encoded by non-adaptive DPCM/Huffman method. LBG algorithm and a fast-PNN algorithm using k-d trees are used for generating a multiresolution codebook. Experimental results show that or scheme outperforms the ordinary wavelet VQ and JPEG at low bit rates.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.486-488
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• 2004

The SRI (Super Resolution Imager) uses the CCD (Charge coupled device) detector that is used to convert the light into electronic data. The purpose of the SRI is to obtain data for high resolution images by converting incoming light into digital stream of pixel data. The SRI has a high resolution, so this electronic system needs more fast imaging data processing, detector control and data transmission systems. This report describes the required system specification and manufactured electronic system for satellite.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.685-691
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• 1993

This paper introduces a PC-based image data processing unit that is composed of preprocessor board and main processor board; The preprocessor contains Inmos A110 processor and efficient H/W architecture for fast mask/logic operations at the speed of video signal rate. It is controlled by the main processor which communicates with the host PC. The main processor board contains TI TMS320C31 digital signal processor, and can access the frame memory of the processor for extra S/W tasks. We test 3*3, 5*5 masks and logic operations on 386/486/DSP and compare the result with that of the proposed unit. The result shows ours are extremely faster than conventional CPU based approach, that is, over several hundred times faster than even DSP.