Yun-Ho Ko

Chungnam National University

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Co-Authors

Si-Woong Lee

Hanbat National University

Hyun‐Soo Kang

Chungbuk National University

Jin-Hyung Kim

Korea Aerospace Research Institute

Jihong Lee

Chungnam National University

Byoung‐Ju Yun

Kyungpook National University

Jae-Soo Cho

Korea University of Technology and Education

Jae‐Won Suh

Chungbuk National University

Jae Wan Kwon

Kyungpook National University

Young‐Woo Park

Chungnam National University

Jeonghong Park

Korea Research Institute of Ships and Ocean Engineering

Cooperative Institutions

Korea Advanced Institute of Science and Technology

Chungnam National University

Yonsei University

Seoul National University

Korea University

Electronics and Telecommunications Research Institute

Samsung (South Korea)

Sungkyunkwan University

Chungbuk National University

Chonnam National University

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Experimental study on the frequency characteristics of cloud cavitation on a full-spade rudder of a ship

Ocean Engineering (2022)

Bu-Geun Paik Jong-Woo Ahn Hongseok Jeong Hanshin Seol Jaeyeol Song

Rudder

10.1016/j.oceaneng.2022.111157

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Citations (2)

Color Analysis Based on Multivariate Gaussian Mixture Models for Froth Flotation Monitoring

Journal of Korea Multimedia Society (2023)

Jae-Won An Yun-Ho Ko

Froth flotation is a type of mineral processing that selectively separates useful minerals from theBRfroth produced by pulp aeration. The physical features of the froth contain information to understandBRthe status of the process of froth flotation. In particular, by obtaining the color feature of the froth, itBRis possible to predict not only the type of useful mineral but also the grade of the mineral. Therefore,BRit is very important to obtain high-precision color analysis results in froth flotation monitoring. In thisBRpaper, we propose a color analysis method based on multivariate Gaussian mixture models to guaranteeBRthe cyclicity with a period of 360 degrees in hue component of color. In order to verify the proposedBRmethod, we present the color analysis results of images which contain around 0º (360º ) of hue andBRimages obtained by froth flotation. Through the experimental results, it shows that the color analysisBRresults obtained by the proposed method are more precise.BR

Hue

Froth flotation

Color analysis

10.9717/kmms.2023.26.3.457

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Multi-baseline based texture adaptive belief propagation stereo matching technique for dense depth-map acquisition

2016 International Conference on Electronics, Information, and Communications (ICEIC) (2014)

Jin-Hyung Kim Jae Wan Kwon Yun-Ho Ko

In this paper a new multi-baseline stereo matching framework based on a modified belief propagation algorithm is presented to acquire dense depth-map. We propose a new matching cost, Extended Mean of Absolute Differences as local evidence in order to consider all possible disparity candidates and obtain dense depth-map. Also we propose a method that decides the weight parameter λ in belief propagation algorithm adaptively to local texture activity.

Belief Propagation

Baseline (sea)

Depth map

Texture (cosmology)

Propagation of uncertainty

10.1109/elinfocom.2014.6914405

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Citations (2)

Comments on “Superconducting Microstrip Antennas: An Experimental Comparison of Two Feeding Methods”

IEEE Transactions on Antennas and Propagation (2004)

Dong Chul Chung Su Y. Choi Yun-Ho Ko Beom-Soo Han

For original paper see Richard et al. (IEEE Trans. Antennas Propag., vol.41, p.967-74, 1993 July).

10.1109/tap.2004.825161

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Citations (1)

Polar co-ordinates shape adaptive discrete transform-based watermarking scheme for arbitrarily-shaped object

Electronics Letters (2001)

Yun-Ho Ko Seong Dae Kim

A new watermarking scheme for arbitrarily-shaped image is proposed. Using co-ordinates conversion to log-polar and polar co-ordinates shape adaptive discrete transform (PSADT), the proposed watermarking method can be applied to any arbitrarily-shaped image such as MPEG-4 VOP and is much more robust to geometrical attacks than conventional ones.

Polar coordinate system

10.1049/el:20010920

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Novel Flash Memory Cell with a Channel Multi-Gate Transistor

International Semiconductor Device Research Symposium (2006)

W.-C. Wang Yun-Ho Ko Ming-Ru Tang Sungnam Chang

Flash Memory

Non-Volatile Memory

10.1109/isdrs.2005.1595998

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A New Vertex Adjustment Method for Polygon-Based Shape Coding

IEICE Transactions on Information and Systems (2006)

Byung-Ju Yun Jae-Soo Cho Yun-Ho Ko

In this paper, we propose a new vertex adjustment method which is based on the size ratio of an object and that of a polygon. In the conventional polygonal approximation methods, the sizes of an object and an approximating polygon are quite different, therefore there are so many error pixels between them. The proposed method reduces the size of error regions by adjusting the size of the polygon to that of an object. Simulation results show outstanding performance of the proposed method.

Polygon (computer graphics)

10.1093/ietisy/e89-d.10.2693

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Citations (2)

Improved 3D Shape Measurement Scheme for White Light Phase Shifting Interferometry

Journal of the Institute of Electronics Engineers of Korea (2010)

Kyoung-Il Kim Dong-Yeol Lee Yun-Ho Ko

This paper proposes a new scheme to obtain enhanced 3D shape information rapidly for WLPSI(White Light Phase Shifting Interferometry). WLPSI is a convenient method to measure the height of the micro products. First we propose an effective method of limiting search interval for detecting the peak of the visibility function in order to obtain 3D shpae information rapidly. Second we propose an automatic base level decision method basad on image processing and a correction algorithm using the least square approximation method to overcome the global tilt problem of the conventional WLPSI algorithms. Third we propose an adaptive filtering method to remove the distortion known as bat-wing effect which appears near the step discontinuity. Experimental results show that the proposed overall technique is fast and provides more enhanced 3D shape information compared with the conventional WLPSI algorithms.

Visibility

Distortion (music)

Discontinuity (linguistics)

Source

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Belief propagation stereo matching technique using 2D laser range finder

Journal of Korea Multimedia Society (2014)

Jin-Hyung Kim Yun-Ho Ko

스테레오 카메라는 거리정보의 획득 이외에 대상의 부가적인 정보를 획득할 수 있는 장점이 있어 향후 지능 로봇 시스템에 필수적인 센서로 각광받고 있다. 하지만 건물의 벽면과 같이 대상 표면에 반복적인 무늬가 있는 영역, 질감도가 낮은 영역 등에서는 기존의 기법으로는 정합이 불가능하다. 이러한 한계를 극복하기 위해 본 논문에서는 2D 레이저 거리 측정기를 활용해 국소적으로 획득된 거리정보를 신뢰도 전파스테레오 정합 기법에 융합하여 정합 성능을 향상시키는 기법을 제안한다. 제안된 기법은 기존의 신뢰도 전파 스테레오 정합 기법의 국부-명백함수에 Quad-tree 기반 영상분할 정보를 참조하여 레이저 측정 정보를 추가하고, 영상의 과분할 정보를 참조하여 국부-적합성 함수를 계산한다. 제안한 기법을 모의 실험영상과 실영상에 적용한 결과 질감도가 낮은 영역에서도 부분적으로 거리정보를 획득할 수 있었으며, 영역분할 정보의 사용으로 깊이 정보의 불연속성이 유지되는 것을 관찰할 수 있었다. Stereo camera is drawing attention as an essential sensor for future intelligence robot system since it has the advantage of acquiring not only distance but also other additive information for an object. However, it cannot match correlated point on target image for low textured region or periodic patterned region such as wall of building or room. In this paper, we propose a stereo matching technique that increase the matching performance by fusing belief propagation stereo matching algorithm and local distance measurements of 2D-laser range finder in order to overcome this kind of limitation. The proposed technique adds laser measurements by referring quad-tree based segment information on to the local-evidence of belief propagation stereo matching algorithm, and calculates compatibility function by reflecting over-segmented information. Experimental results of the proposed method using simulation and real test images show that the distance information for some low textured region can be acquired and the discontinuity of depth information is preserved by using segmentation information.

Belief Propagation

Discontinuity (linguistics)

10.9717/kmms.2014.17.2.132

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Progressive Side Information Refinement Algorithm for Wyner-Ziv Codec

IEICE Transactions on Information and Systems (2011)

Chanhee Han Si-Woong Lee Hamid GholamHosseini Yun-Ho Ko

In this paper, side information refinement methods for Wyner-Ziv video codec are presented. In the proposed method, each block of a Wyner-Ziv frame is separated into a predefined number of groups, and these groups are interleaved to be coded. The side information for the first group is generated by the motion compensated temporal interpolation using adjacent key frames only. Then, the side information for remaining groups is gradually refined using the knowledge of the already decoded signal of the current Wyner-Ziv frame. Based on this basic concept, two progressive side information refinement methods are proposed. One is the band-wise side information refinement (BW-SIR) method which is based on transform domain interleaving, while the other is the field-wise side information refinement (FW-SIR) method which is based on pixel domain interleaving. Simulation results show that the proposed methods improve the quality of the side information and rate-distortion performance compared to the conventional side information refinement methods.

Codec

Interleaving

Distortion (music)

Interpolation

10.1587/transinf.e94.d.1641

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