Biography

Ouk Choi received his B.Sc., M.Sc., and Ph.D. degrees from KAIST, Republic of Korea, in 2001, 2003, and 2009, respectively. During his studies at KAIST, he made contributions in computer vision and robotics problems such as image matching, segmentation and registration, which were applied to object recognition and visual navigation. In 2009, he joined SAIT, Samsung Electronics, and carried out extensive research projects ranging from ToF sensing architecture to depth image processing. He especially devoted on phase unwrapping, depth map upsampling, and stereo matching. In 2015, he joined the Department of Electronics Engineering, Incheon National University, Republic of Korea, as an assistant professor. In 2019, he became an associate professor. His current research interest includes deep learning and 3D computer vision.

Academic

• Visiting Scholar, Scientific Computing and Imaging Institute, University of Utah, 2021.9-present.

• Associate Professor, Dept. of Electronics Engineering, Incheon National University, Republic of Korea, 2019.3-present.

• Assistant Professor, Dept. of Electronics Engineering, Incheon National University, Republic of Korea, 2015.2-2019.2.

• Ph.D. Electrical Engineering (Robotics and Computer Vision Lab.), KAIST, Republic of Korea, 2009.

• M.Sc. Electrical Engineering (Robotics and Computer Vision Lab.), KAIST, Republic of Korea, 2003.

• B.Sc. Electrical Engineering, KAIST, Republic of Korea, 2001.

• Incheon Science High School, Republic of Korea, 1995-1997.

Industrial

• Research Scientist, SAIT, Republic of Korea, 2009-2015.2.

Talks, Tutorials, and Lectures

• Seungkyu Lee, Hyunjung Shim, and Ouk Choi, "Time-of-flight depth image enhancement," in Tutorials of IEEE International Conference on Image Processing, 2012.

Academic/Industrial Honors and Awards

• Bronze Prize - Young-Jun Son, Ouk Choi, Hwasup Lim, Sang Chul Ahn, "Depth-based fingertip detection for human-projector interaction on tabletop surfaces," in IEEE/IEIE ICCE-Asia Best Paper Award, 2016.

• Bronze Prize - Ouk Choi, Hwasup Lim, Sang Chul Ahn "Robust binarization of gray-coded pattern images for smart projectors," in ICEIC Best Paper Award, 2016.

• Gold Prize - Ouk Choi, Byongmin Kang, Seung-Won Jung, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "Beyond the time-of-flight principle: Reduction of systematic errors in time-of-flight depth measurements," in Samsung Best Paper Award, 2012.

• Bronze Prize - Seong-Jin Kim, Byongmin Kang, Ouk Choi, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "FHD time-division color/depth capturing architecture: from sensor design, 3D image processing, to multi-view generation," in Samsung Best Paper Award, 2011.

• Gold Prize - Ouk Choi, "Robust feature point matching by preserving local geometric consistency," in the 15th Samsung Humantech Thesis Award, 2009.

Publication

Books

Miles Hansard, Seungkyu Lee, Ouk Choi, and Radu Horaud, "Time-of-flight cameras: principles, algorithms and applications," Springer, 2012.

International Journal

Ouk Choi and Wonjun Hwang, "Colored point cloud registration by depth filtering," Sensors, vol. 21, no. 21, p. 7023, 2021.

Youngbin Kim, Ouk Choi, and Wonjun Hwang, "Low bit-based convolutional neural network for one-class object detection," Electronics Letters, vol. 57, no. 6, pp. 255-257, 2021.

Ouk Choi, Min-Gyu Park, and Youngbae Hwang, "Iterative K-closest point algorithms for colored point cloud registration," Sensors, vol. 20, no. 8, p. 5331, 2020.

Ouk Choi, Jongwun Choi, Namkeun Kim, and Min Chul Lee, "Combustion instability monitoring through deep-learning-based classification of sequential high-speed flame images," Electronics, vol. 9, no. 5, p. 848, 2020.

Jongwun Choi, Ouk Choi, Min Chul Lee, and Namkeun Kim, "On the observation of the transient behavior of gas turbine combustion instability using the entropy analysis of dynamic pressure," Experimental Thermal and Fluid Science, vol. 115, p. 110099, 2020.

Young Chan Kwon, Jae Won Jang, Hwasup Lim, and Ouk Choi*, "Feasibility analysis of deep learning-based reality assessment of human back-view images," Electronics, vol. 9, no. 4, p. 656, 2020.

Jae Won Jang, Young Chan Kwon, Hwasup Lim, and Ouk Choi*, "CNN-based denoising, completion, and prediction of whole-body human-depth images," IEEE Access, vol. 7, no. 1, pp. 175842-175856, 2019.

Jae Won Jang, Young Chan Kwon, Wonjun Hwang, and Ouk Choi*, "Robust alternating optimisation for extrinsic calibration of RGB-D cameras," Electronics Letters, vol. 55, no. 18, pp. 992-994, 2019 (interviewed article).

Ouk Choi*, Young-Jun Son, Hwasup Lim, and Sang Chul Ahn, "Co-recognition of multiple fingertips for tabletop human-projector interaction," IEEE Transactions on Multimedia, vol. 21, no. 6, pp. 1487-1498, 2019.

Young Chan Kwon, Jae Won Jang, Youngbae Hwang, and Ouk Choi*, "Multi-cue-based circle detection and its application to robust extrinsic calibration of RGB-D cameras," Sensors, vol. 19, no. 7, p. 1539, 2019.

Hyunsuk Ko, Han Suk Shim, Ouk Choi and C.-C. Jay Kuo, "Robust uncalibrated stereo rectification with constrained geometric distortions (USR-CGD)," Image and Vision Computing, vol. 60, no. 4, pp. 98-114, 2017.

Ouk Choi and Min Chul Lee, "Investigation into the combustion instability of synthetic natural gases using high speed flame images and their proper orthogonal decomposition," International Journal of Hydrogen Energy, vol. 41, no. 45, pp. 20731-20743, 2016.

Ouk Choi and Hyun Sung Chang, "Yet another cost aggregation over models," IEEE Transactions on Image Processing, vol. 25, no. 11, pp. 5397-5410, 2016.

Jaehyuk Choi and Ouk Choi*, "Integrated visual sensor with 2D/3D imaging and in situ proximity sensing for mobile devices," Electronics Letters, vol. 52, no. 16, pp. 1377-1379, 2016.

Seung-Won Jung and Ouk Choi*, "Learning-based filter selection scheme for depth image super resolution," IEEE Transactions on Circuits and Systems for Video Technology, vol. 24, no. 10, pp. 1641-1650, 2014.

Ouk Choi and Seung-Won Jung, "A consensus-driven approach for structure and texture aware depth map upsampling," IEEE Transactions on Image Processing, vol. 23, no. 8, pp. 3321-3335, 2014.

Sun Kwon Kim, Byongmin Kang, Jingu Heo, Seung-Won Jung, and Ouk Choi, "A photometric stereo based single time-of-flight camera," Optics Letters, vol. 39, no. 1, pp. 166-169, 2014.

Seung-Won Jung and Ouk Choi, "Color image enhancement using depth and intensity measurements of a Time-of-Flight camera," Optical Engineering, vol. 52, no. 10, pp. 103104-1-11, 2013.

Ouk Choi, Seungkyu Lee, and Hwasup Lim, "Inter-frame consistent multi-frequency phase unwrapping for Time-of-Flight cameras," Optical Engineering, vol. 52, no. 5, pp. 057005-1-12, 2013.

Byongmin Kang, Ouk Choi, James D. K. Kim, and Dosik Hwang, "Noise reduction in magnetic resonance images using adaptive non-local means filtering," Electronics Letters, vol. 49, no. 5, pp. 324-326, 2013.

Ouk Choi and In-So Kweon, "Robust feature point matching by preserving local geometric consistency," Computer Vision and Image Understanding, vol. 113, no. 6, pp. 726-742, 2009.

International Conference

Surojit Saha, Ouk Choi, Ross Whitaker, "Few-shot Segmentation of Microscopy Images using Gaussian Process," 1st International Workshop on Medical Optical Imaging and Virtual Microscopy Image Analysis (MICCAI Workshops), 2022 (best paper award).

Kunliang Liu, Ouk Choi, Jianming Wang, and Wonjun Hwang, "CDGNet: Class Distribution Guided Network for Human Parsing," IEEE/CVF Conference on Computer Vision and Pattern Recognition, pp. 4473-4482, 2022.

Hyungho Kim, Hyeon Cho, Ouk Choi, Wonjun Hwang, "D-ALICE: Domain Adaptation-based Labeling the human In Cartoon imagE," International Conference on Robot Intellignce Technology and Applications, pp. 78-82, 2019.

Young Chan Kwon, Jae Won Jang, and Ouk Choi, "Automatic sphere detection for extrinsic calibration of multiple RGBD cameras," in International Conference on Control, Automation and Systems, pp. 1451-1454, 2018.

Ouk Choi, Young-Jun Son, Hwasup Lim, and Sang Chul Ahn, "Cascaded fingertip detection and classification for human-projector interaction on tabletop surfaces," in International Conference on Electronics, Information, and Communication, pp. 1275-1278, 2018.

Young-Jun Son, Ouk Choi, "Image-based hand pose classification using Faster R-CNN," in International Conference on Control, Automation and Systems, pp. 1569-1573, 2017, oral presentation.

Young-Jun Son, Ouk Choi, Hwasup Lim, and Sang Chul Ahn, "Depth-based fingertip detection for human-projector interaction on tabletop surfaces," in IEEE/IEIE International Conference on Consumer Electronics Asia, pp. 189-192, 2016, oral presentation.

Ouk Choi, Hwasup Lim, Sang Chul Ahn, "Robust binarization of gray-coded pattern images for smart projectors," in International Conference on Electronics, Information, and Communication, pp. 86-89, 2016, oral presentation.

Ouk Choi and Byongmin Kang, "Denoising of time-of-flight depth data via iteratively reweighted least squares minimization," in IEEE International Conference on Image Processing, pp. 1075-1079, 2013.

Ouk Choi, "Wide range time-of-flight camera: design, analysis, and simulation," in IS&T/SPIE Electronic Imaging, 2013, oral presentation.

Sun Kwon Kim, Ouk Choi, Byongmin Kang, James D. K. Kim, Chang-Yeong Kim, "Time-of-flight depth image enhancement using variable integration time," in IS&T/SPIE Electronic Imaging, 2013.

Ouk Choi and Seungkyu Lee, "Fusion of time-of-flight and stereo for disambiguation of depth measurements," in Asian Conference on Computer Vision, pp. 640-653, 2012.

Ouk Choi, Byongmin Kang, Seung-Won Jung, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "Beyond the time-of-flight principle: Reduction of systematic errors in time-of-flight depth measurements," in Samsung Best Paper Award, 2012.

Ouk Choi and Seungkyu Lee, "Wide range stereo time-of-flight camera," in IEEE International Conference on Image Processing, pp. 557-560, 2012, oral presentation.

Ouk Choi, Hwasup Lim, Byongmin Kang, Yong Sun Kim, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "Discrete and continuous optimizations for depth image super-resolution," in IS&T/SPIE Electronic Imaging, 2012, oral presentation.

Yong Sun Kim, Byongmin Kang, Hwasup Lim, Ouk Choi, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "Parametric model-based noise reduction for ToF depth sensors," in IS&T/SPIE Electronic Imaging, 2012.

Seong-Jin Kim, Byongmin Kang, Ouk Choi, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "FHD time-division color/depth capturing architecture: from sensor design, 3D image processing, to multi-view generation," in Samsung Best Paper Award, 2011.

Hwasup Lim, Yong Sun Kim, Seungkyu Lee, Ouk Choi, James D. K. Kim, and Chang-Yeong Kim, "Bilayer inpainting for novel view synthesis," in IEEE International Conference on Image Processing, pp. 1113-1116, 2011.

Yong Sun Kim, Hwasup Lim, Ouk Choi, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "Separable bilateral nonlocal means," in IEEE International Conference on Image Processing, pp. 1545-1548, 2011.

Ouk Choi, Hwasup Lim, Byongmin Kang, Yong Sun Kim, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "Range unfolding for time-of-flight depth cameras," in IEEE International Conference on Image Processing, pp. 4189-4192, 2010, oral presentation.

Yong Sun Kim, Hwasup Lim, Byongmin Kang, Ouk Choi, Keechang Lee, James D. K. Kim, and Chang-Yeong Kim, "Realistic 3D face modeling using feature-preserving surface registration," in IEEE International Conference on Image Processing, pp. 1821-1824, 2010.

Ouk Choi, "Robust feature point matching by preserving local geometric consistency," in the 15th Samsung Humantech Thesis Award, 2009.

Jungho Kim, Ouk Choi, and In-So Kweon, "Efficient feature tracking for scene recognition using angular and scale constraints," in IEEE/RSJ International Conference on Intelligent Robots and Systems, pp. 4086-4091, 2008.

Ouk Choi and In-So Kweon, "Reducing ambiguity in feature point matching by preserving local geometric consistency," in IEEE International Conference on Image Processing, pp. 293-296, 2008.

Ouk Choi, Hyeongwoo Kim, and In-So Kweon, "Simultaneous plane extraction and 2D homography estimation using local feature transformations," in Asian Conference on Computer Vision, vol. 2, pp. 269-278, 2007, oral presentation.

Ouk Choi and In-So Kweon, "Cosegmentation as a generalized correspondence problem - a motion model driven approach," in International Conference on Ubiquitous Robots and Ambient Intelligence, p. 167, 2007.

Ouk Choi, Kuk-Jin Yoon, and In-So Kweon, "A hierarchical window based approach for correspondence problem in vision," in the International Conference on Mechatronics and Information Technology, pp. 590-594, 2003, oral presentation.

Domestic Conference

Ouk Choi, Young Chan Kwon, Jae Won Jang, Sejin Ji, "A study on extrinsic calibration of multiple RGB-D cameras for guidance of the escape route in a disaster situation," in KICS Winter Conference, 2019.

Jun-Pil Ko, Su-Bin Bea, Ouk Choi, "Korean character-level writer identification using CNN," in IEIE Fall Conference, pp. 842-845, 2017.

So-Yeon Kang and Ouk Choi, "Speech emotion recognition using random forest," in KICS Winter Conference, pp. 950-951, 2017.

So-Yeon Kang and Ouk Choi, "A survey on classifiers for speech emotion recognition," in IEIE Summer Conference, pp. 756-759, 2016.

Young-Jun Son, Ouk Choi, Hwasup Lim, and Sang Chul Ahn, "Depth-based fingertip detection for human-projector interaction on tabletop surfaces," in IEIE Summer Conference, pp. 682-685, 2016.

Theses

Ph.D. Thesis, KAIST, 2009, Robust correspondence search using local and global constraints.

M.Sc. Thesis, KAIST, 2003, A new feature based stereo matching algorithm.