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Biography
Dr. Yao-Jen (Kevin) Chang has been with the Siemens
Healthineers as
a senior key expert scientist since 2011, where he conducts research
on 3D computer vision and machine learning. From 2009 to 2011, he
was with the School
of Electrical and Computer Engineering, Cornell University as
a research associate focusing on multi-view computer vision and
content-based information retrieval. From 2007 to 2009, he was with
the Department
of Electrical and Computer Engineering, Carnegie Mellon University as
a research scientist focusing on image-based synthesis and modeling.
From 2003 to 2007, he served as a researcher and the
vision team group leader at the Advanced Technology Center,
Information & Communications Research Labs, Industrial
Technology Research Institute, where he led research on
real-time video-realistic speech animation and video surveillance.
His research interests include computer vision, computer graphics,
machine learning, and computational photography. Dr. Chang received
his Ph.D. degree from the Department
of Electrical Engineering, National
Tsing Hua University, Hsinchu, Taiwan in 2002.
Research
Reformulate the structure from motion framework to incorporate the
refractive distortion model for multi-view 3D scene reconstruction
under the refractive plane.
Apply the active learning framework widely adopted in CBIR to the
interactive 3D scene reconstruction. By quantifying the uncertainty
of each region’s geometry inferred by the energy minimization, our
algorithm requests feedbacks from a user to provide intuitive
geometric cues on the most informative regions; thereby effectively
reducing human's efforts for interactive 3D reconstruction.
Active Image-based Rendering with Robot-based Imaging Testbed:
Design mobile robots for active capturing and rendering of
environments.
Embedded Video Surveillance:
Investigate distributed video surveillance networks based on
miniaturized smart cameras capable of performing on-board visual
analysis and video streaming.
Software Development Toolkit for Video Surveillance:
Investigate a video surveillance architecture and framework for
rapid development of video surveillance applications for home care,
home security, and parking lot services.
Image-based Videorealistic Speech Animation:
Investigate a user adaptation method for creation of image-based
speech animation of a novel person with limited video corpus.
Algorithms for Key Generation based on Biometrics:
Develop a biometrics-based cryptographic key generation mechanism
for generating cryptographic keys on resource-constrained handheld
devices.
Publications
- Vivek Singh, Kai Ma, Birgi
Tamersoy, Yao-Jen
Chang,
Andreas Wimmer, Thomas O’Donnell and Terrence Chen, "DARWIN:
Deformable Patient Avatar Representation With Deep Image Network," Proceedings
of the 20th Annual International Conference on Medical Image
Computing and Computer Assisted Intervention (MICCAI
2017),
Quebec City, Quebec, Canada, Sept. 10-14, 2017.
- Kai Ma, Jiangping Wang, Vivek
Singh, Birgi Tamersoy, Yao-Jen Chang, Andreas
Wimmer and Terrence Chen, "Multimodal Image Registration with Deep
Context Reinforcement Learning," Proceedings of the 20th Annual
International Conference on Medical Image Computing and Computer
Assisted Intervention (MICCAI 2017), Quebec City, Quebec,
Canada, Sept. 10-14, 2017.
-
B.
Pollack, Y. Chang and T. Chen, "Optimized
Handling of Every Tube through Machine-vision-guided Automation," 68th
AACC Annual Scientific Meeting & Clinical Lab Expo,
Philadelphia, PA, USA, July 31-Aug. 4, 2016.
-
Vivek
Singh, Yao-Jen
Chang,
Kai Ma, Michael Wels, Grzegorz Soza and Terrence Chen, "Estimating
Patient Surface Model for Optimizing Medical Scanning Workflow," Proceedings
of the 17th Annual International Conference on Medical Image
Computing and Computer Assisted Intervention (MICCAI-2014),
Boston, MA, USA, Sept. 14-18, 2014.
-
Adarsh
Kowdle, Yao-Jen
Chang, Andrew Gallagher, Dhruv Batra and Tsuhan
Chen. "Putting the User in the Loop for Image-Based Modeling", International
Journal of Computer Vision,
Vol. 108, No. 1-2, pp. 30-48, May 2014.
-
Yao-Jen Chang and
Tsuhan Chen, "Image-based Rendering," Book Chapter in Academic
Press Library in Signal Processing, Volume 4: Image, Video
Processing and Analysis, Hardware, Audio, Acoustic and Speech
Processing, Academic Press, 2013.
-
Zhaoyin Jia, Andrew Gallagher, Yao-Jen
Chang and
Tsuhan Chen, "A Learning Based Framework for Depth Ordering," Proceedings
of 2012 International Conference on Computer Vision and Patter
Recognition (CVPR-2012),
Providence, Rhode Island, USA, June 16-21, 2012.
-
Yao-Jen Chang and
Tsuhan Chen, "Multi-View
3D Reconstruction for Scenes under the Refractive Plane with Known
Vertical Direction," Proceedings of 2011
International Conference on Computer Vision (ICCV-2011),
Barcelona, Spain, Nov. 6-13, 2011.
-
Adarsh
Kowdle, Yao-Jen
Chang,
Andrew Gallagher and Tsuhan Chen. "Active
Learning for Piecewise Planar 3D Reconstruction", Proceedings
of 2011 International Conference on Computer Vision and Pattern
Recognition (CVPR-2011),
Colorado Springs, USA, June 21-23, 2011. (Oral)
-
Yao-Jen Chang and
Tsuhan Chen, "Semi-supervised Learning with Kernel
Locality-constrained Linear Coding," Proceedings of
2011 International Conference on Image Processing (ICIP-2011),
Brussels, Belgium, Sept. 11-14, 2011.
-
Adarsh
Kowdle, Yao-Jen
Chang,
Dhruv Batra, and Tsuhan Chen, "Scribble Based Interactive 3D
Reconstruction via Scene Co-segmentation," Proceedings
of 2011 International Conference on Image Processing (ICIP-2011),
Brussels, Belgium, Sept. 11-14, 2011.
-
Zhaoyin Jia, Yao-Jen
Chang,
and Tsuhan Chen, "Dense Interpolation of 3D Points Based on Surface
and Color," Proceedings
of 2011 International Conference on Image Processing (ICIP-2011),
Brussels, Belgium, Sept. 11-14, 2011.
-
Yao-Jen Chang,
Hung-Hsun Liu, and Tsuhan Chen, "Improving Subpixel Stereo Matching
with Segment Evolution," Proceedings of 2010
International Conference on Image Processing (ICIP-2010),
Hong Kong, Sept. 26-29, 2010.
-
Wei
Yu, Ahmed Bilal Ashraf, Yao-Jen
Chang,
and Tsuhan Chen, "3D Augmented Markov Random Field for Object
Recognition," Proceedings
of 2010 International Conference on Image Processing (ICIP-2010),
Hong Kong, Sept. 26-29, 2010.
-
Wei
Yu, Franz Franchetti, Yao-Jen
Chang,
and Tsuhan Chen, "Fast and Robust Active Contours for Image
Segmentation," Proceedings
of 2010 International Conference on Image Processing (ICIP-2010),
Hong Kong, Sept. 26-29, 2010.
-
Wei
Yu, Franz Franchetti, James C. Hoe, Yao-Jen
Chang,
and Tsuhan Chen, "Fast Bilateral Filtering by Adapting Block Size," Proceedings
of 2010 International Conference on Image Processing (ICIP-2010),
Hong Kong, Sept. 26-29, 2010.
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Yao-Jen Chang,
Keisuke Kamataki, and Tsuhan Chen, "Mean Shift Feature Space Warping
for Relevance Feedback," Proceedings of 2009
International Conference on Image Processing (ICIP-2009),
pp. 1849-1852, Cairo, Egypt, Nov. 7-11, 2009.
-
Zhaoyin Jia, Yao-Jen
Chang,
and Tsuhan Chen, "Active View Selection for Object and Pose
Recognition," Workshop
on 3D Representation for Recognition (3dRR-09), in
conjunction with the 2009 International Conference on Computer
Vision (ICCV-2009),
Kyoto, Japan, Sept. 27-Oct. 4, 2009.
-
Zhaoyin Jia, Yao-Jen
Chang,
Tzung-Han Lin, and Tsuhan Chen, "Dense 3D-Point Estimation Based on
Surface Fitting and Color Information," 2009
Western New York Image Processing Workshop (WNYIP-2009),
Henrietta, NY, USA, Sept. 25, 2009.
-
Adarsh
Kowdle, Yao-Jen
Chang,
and Tsuhan Chen, "i3D: Interactive Planar Reconstruction of Objects
and Scenes," 2009
Western New York Image Processing Workshop (WNYIP-2009),
Henrietta, NY, USA, Sept. 25, 2009.
-
Ching-Chun Huang, Sheng-Jyh Wang, Yao-Jen
Chang,
and Tsuhan Chen, "A Bayesian Hierarchical Detection Framework for
Parking Space Detection," Proceedings
of 2008 IEEE International Conference on Acoustics, Speech, and
Signal Processing (ICASSP-2008),
Las Vegas, NV, USA, Mar. 30-Apr. 4, 2008.
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Ming-Yu Shih, Yao-Jen
Chang,
Bwo-Chau Fu, and Ching-Chun Huang, "Motion-based Background Modeling
for Moving Object Detection on Moving Platforms," Proceedings
of the 1st International Workshop on Multimedia Analysis and
Processing (IMAP-2007), in
conjunction with the 16th International Conference on Computer
Communications and Networking (ICCCN-2007),
Honolulu, Hawaii, USA, Aug. 15-16, 2007.
-
Ke-Zhao Chen, Yao-Jen
Chang,
and Chia-Wen Lin "Video-based Authentication Using Appearance Models
and HMMs," Proceedings
of IEEE International Symposium of Circuits and Systems (ISCAS-2006),
Island of Kos, Greece, May 21-24, 2006.
-
Yao-Jen
Chang and
Tony Ezzat, "Transferable Videorealistic Speech Animation," Proceedings
of ACM SIGGRAPH/Eurographics Symposium on Computer Animation (SCA-2005),
Los Angeles, CA, USA, July 29-31, 2005.
-
Wende
Zhang, Yao-Jen
Chang,
Tsuhan Chen, "Optimal Thresholding for Key Generation based on
Biometrics," Proceedings
of 2004 IEEE International Conference on Image Processing (ICIP-2004),
Vol. 5, pp. 3451-3454, Singapore, Oct. 24-27, 2004.
-
Yao-Jen Chang,
Wende Zhang, Tsuhan Chen, "Biometrics-based Cryptographic Key
Generation," Proceedings of 2004 IEEE International
Conference on Multimedia and Expo (ICME-2004),
Vol. 3, pp. 2203-2206, Taipei, Taiwan, June 27-30, 2004.
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Pei-Wei Hsu, Yao-Jen
Chang,
Chao-Kuei Hsieh, and Yung-Chang Chen, "Facial Expression Cloning:
Using Expressive Ratio Image and FAP to Texture Conversion," Proceedings
of 2003 IEEE Pacific-Rim Conf. on Multimedia (ICICS-PCM2003),
Singapore, Dec. 15-18, 2003.
-
Yao-Jen Chang,
Chao-Kuei Hsieh, Pei-Wei Hsu, and Yung-Chang Chen, "Speech-Assisted
Facial Expression Analysis and Synthesis for Virtual Conferencing
Systems," Proceedings of 2003 IEEE International
Conference on Multimedia and Expo (ICME-2003),
Vol. 3, pp. 529-532, Bultimore, MD, USA, July 6-9, 2003.
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Chia-Wen Lin, Yao-Jen
Chang,
and Yung-Chang Chen, "A Low-Complexity Face Detection Scheme for Low
Bit-Rate Video Telephony," IEICE
Transactions on Information and Systems,
Vol. E86-D, No.1, pp.101-108, Jan. 2003.
-
Chien-Chia Chien, Yao-Jen
Chang,
and Y.C. Chen, "Facial Expression Analysis Under Various Head
Poses," Proceedings
of 3rd IEEE Pacific-Rim Conf. on Multimedia (PCM-2002),
Hsinchu, Taiwan, Dec. 16-18, 2002.
-
Chia-Wen Lin, Chih-Ming Wang, Yao-Jen
Chang,
and Yung-Chang Chen, “Realtime Object Extraction and Tracking using
an Active Camera with Image Mosaics,” Proceedings
of IEEE International Workshop on Multimedia Signal Processing (MMSP-2002),
pp. 149-152, Virgin Islands, USA, Dec. 9-11, 2002.
-
Yao-Jen Chang,
Chien-Chia Chien, and Yung-Chang Chen, "Video Realistic Avatar for
Virtual Face-to-Face Conferencing," Proceedings
of 2002 IEEE International Conference on Multimedia and Expo (ICME-2002),
Vol. 2, pp. 1-4, Lausanne, Switzerland, Aug. 26-29, 2002.
-
Chia-Wen Lin, Yao-Jen
Chang,
Chih-Ming Wang, Yung-Chang Chen, and Ming-Ting Sun, "A Standard
Compliant Virtual Meeting System with Active Video Object Tracking," Eurasip
Journal on Applied Signal Processing,
Vol. 2002, No. 6, pp. 622-634, June 2002.
-
Yao-Jen Chang and
Yung-Chang Chen, "Facial Model Adaptation from a Monocular Image
Sequence Using a Textured Polygonal Model," Signal
Processing: Image Communication, Vol. 17,
No. 5, pp. 373-392, May 2002.
-
Yao-Jen Chang and
Yung-Chang Chen, "Development of a Video Realistic Virtual
Conferencing System," Proceedings of 2001
International Symposium on Communications (ISCOM-01),
Tainan, Taiwan, Nov. 13-16, 2001.
-
Yao-Jen Chang and
Yung-Chang Chen, "Robust Head Pose Estimation Using Textured
Polygonal Model with Local Correlation Measure," Proceedings
of the Second IEEE Pacific-Rim Conference on Multimedia (PCM-2001),
pp. 245-252, Beijing, China, Oct. 24-26, 2001.
-
Yao-Jen Chang and
Yung-Chang Chen, "Textured Polygonal Model Assisted Facial Model
Estimation from Image Sequence," Proceedings of 2001
IEEE International Conference on Image Processing (ICIP-2001),
Vol. 3, pp. 106-109, Thessaloniki, Greece, Oct. 7-10, 2001.
-
Chia-Wen Lin, Yao-Jen
Chang,
Yung-Chang Chen, and Ming-Ting Sun, "Implementation of a Real-time
Object-Based Virtual Meeting System," Proceedings
of 2001 IEEE International Conference on Multimedia and Expo (ICME-2001),
pp. 565-568, Tokyo, Japan, Aug. 22-25, 2001.
-
Jen-Chung Chou, Yao-Jen
Chang,
and Yung-Chang Chen, "Facial Feature Point Tracking and Expression
Analysis for Virtual Conferencing Systems," Proceedings
of 2001 IEEE International Conference on Multimedia and Expo (ICME-2001),
pp.415-418, Tokyo Japan, Aug. 22-25, 2001.
-
Yao-Jen Chang,
Chih-Chung Chen, Jen-Chung Chou, and Yung-Chang Chen, "Development
of a Multi-user Virtual Conference System Using a Layered
Audio-Visual Integration," Proceedings of the First
IEEE Pacific-Rim Conference on Multimedia (PCM-2000),
pp.50-53, University of Sydney, Australia, Dec. 13-15, 2000.
-
Chia-Wen Lin, Yao-Jen
Chang,
and Yung-Chang Chen, "Low-complexity Face-assisted Video Coding," Proceedings
of 2000 IEEE International Conference on Image Processing (ICIP-2000),
Vol. 2, pp.207-210, Vancouver, British Columbia, Canada, Sept.
10-13, 2000.
-
Yao-Jen Chang,
Chih-Chung Chen, Jen-Chung Chou, and Yung-Chang Chen, "Virtual Talk:
A Model-Based Virtual Phone Using a Layered Audio-Visual
Integration," Proceedings of 2000 IEEE International
Conference on Multimedia and Expo (ICME-2000),
pp. 415-418, New York City, NY, USA, July 30 - Aug. 2, 2000.
-
Yao-Jen Chang,
Chih-Chung Chen, Jen-Chung Chou, and Yung-Chang Chen,
"Implementation of a Virtual Chat Room for Multimedia
Communications," Proceedings of IEEE Signal
Processing Society 1999 Workshop on Multimedia Signal Processing (MMSP99),
pp. 599-604, Copenhagen, Denmark, Sept.13-15, 1999.
-
Chia-Wen Lin, Yao-Jen
Chang,
Eryin Fei, and Yung-Chang Chen, "Efficient Video Coding with R-D
Constrained Quadtree Segmentation," Proceedings
of Picture Coding Symposium (PCS99),
pp. 57-60, Portland, Oregon, April 21-23, 1999.
-
Chia-Wen Lin, Yao-Jen
Chang,
and Yung-Chang Chen, "Hierarchical Motion Estimation Algorithm Based
on Pyramidal Successive Elimination," Proceedings
of International Computer Symposium (ICS98),
Workshop on Image Processing and Character Recognition, pp. 41-44,
Tainan, Taiwan, Dec. 17-19, 1998.
-
Yao-Jen Chang,
Yun-Chin Li, and Yung-Chang Chen, "An MPEG-4 SNHC Compatible
Implementation of a Virtual Chat Room," Proceedings
of IEEE International Symposium on Consumer Electronics (ISCE98),
pp.WAA2-17~20, Taipei, Taiwan, Oct. 19-21, 1998.
Patents
- Stefan Kluckner, Yao-Jen Chang, Wen Wu, Benjamin S. Pollack, Terrence Chen, “Barcode tag detection in side view sample tube images for laboratory automation,” US Patent #10,824,832.
- Stefan Kluckner, Yao-Jen Chang, Terrence Chen, Benjamin S. Pollack, Patrick Wissmann, “Methods and apparatus for detecting an interferent in a specimen,” US Patent #10,816,538.
- Zhuokai Zhao, Yao-Jen Chang, Ruhan Sa, Kai Ma, Jiangping Wang, Vivek Kumar Singh, Terrence CHen, Andreas Wimmer, Birgi Tamersoy, “System and method for assisted patient positioning,” US Patent #10,783,655.
- Rui Wang, Yao-Jen Chang, Vivek Kumar Singh, Birgi Tamersoy, “X-ray detector pose estimation in medical imaging,” US Patent #10,779,793.
- Vivek Kumar Singh, Klaus J. Kirchberg, Kai Ma, Yao-Jen Chang, Terrence Chen, “Method and system for learning to obtain medical scans of patients,” US Patent #10,748,034.
- Stefan Kluckner, Yao-Jen Chang, Terrence Chen, Benjamin S. Pollack, “Methods and apparatus for multi-view characterization,” US Patent #10,746,753.
- Stefan Kluckner, Yao-Jen Chang, Terrence Chen, Benjamin S. Pollack, “Methods and apparatus for classifying an artifact in a specimen,” US Patent #10,746,665.
- Yao-Jen Chang, Patrick Wissmann, Wen Wu, Guillaume Dumont, Benjamin S. Pollack, Terrence Chen, “Image-based tray alignment and tube slot localization in a vision system,” US Patent #10,725,060.
- Yao-Jen Chang, Birgi Tamersoy,Susanne Oepping, Ralf Ranke, Terrence Chen, “Method and system of automated X-ray positioning and collimation control on hand and foot scan,” US Patent #10,716,530.
- Yao-Jen Chang, Terrence Chen, Birgi Tamersoy, Vivek Kumar Singh, Susanne Oepping, Ralf Nanke, “Medical imaging device and method controlling one or more parameters of a medical imaging device,” US Patent #10,624,602.
- Vivek Kumar Singh, Yao-Jen Chang, Birgi Tamersoy, Susanne Dornberger, Ralf Nanke, Terrence Chen, “X-Ray system and method for standing subject,” US Patent #10.507,002.
- Birgi Tamersoy, Vivek Kumar Singh, Yao-Jen Chang, Susanne Dornberger, Ralf Nanke, Terrence Chen, “Method of automatically positioning an X-ray source of an X-ray system and an X-ray system,” US Patent #10,478,149.
- Jiangping Wang, Kai Ma, Vivek Singh, Mingqing Chen, Yao-Jen Chang, Shaohua Kevin Zhou, Terrence Chen, Andreas Krauss, “Scan data retrieval with depth sensor data,” US Patent #10,430,551.
- Vivek Kumar Singh, Stefan Kluckner, Yao-Jen Chang, Kai Ma, Terrence Chen, “System for dense registration of two-dimensional depth images,” US Patent #10,425,629.
- Vivek Kumar Singh, Yao-Jen Chang, Kai Ma, Terrence Chen, Michael Wels, Grzegorz Soza, “Estimating body surface models of patients,” US Patent #10,331,850.
- Khurram Soomro, Yao-Jen Chang, Stefan Kluckner, Wen Wu, Benjamin Pollack, Terrence Chen, “Classification of barcode tag conditions from top view sample tube images for laboratory automation,” US Patent #10,325,182.
- Wen Wu, Benjamin Pollack, Yao-Jen Chang, Guillaume Dumont, Terrence Chen, “Locality-based detection of tray slot types and tube types in a vision system,” US Patent #10,319,092.
- Yao-Jen Chang, Wen Wu, Guillaume Dumont, Benjamin Pollack, Terrence Chen, “Image-based tube slot circle detection for a vision system,” US Patent #10,290,090.
- Wen Wu, Yao-Jen Chang, David Liu, Benjamin Pollack, Terrence Chen, "Drawer Vision System", US Patent #10,140,705.
- Birgi Tamersoy, Kai Ma, Vivek Kumar Singh, Yao-jen Chang, Ziyan Wu, Terrence Chen, Andreas Wimmer, "Human body representation with non-rigid parts in an imaging system," US Patent #9,898,858
- Yao-Jen Chang, Vivek Kumar Singh, Kai Ma, Ralf Nanke, Susanne Dornberger, Terrence Chen, "Method and System of Scanner Automation for X-Ray Tube with 3D Camera," US Patent #9,895,131.
- Stefan Kluckner, Vivek Kumar Singh, Kai Ma, Yao-Jen Chang, Terrence Chen, Daphne Yu, John Paulus, Jr. "Systems and Methods for See-through Views of Patients," US Patent #9,665,936.
- Kai Ma, Yao-Jen Chang, Vivek Kumar Singh, Thomas O'Donnell, Michael Wels, Tobias Betz, Andreas Wimmer, Terrence Chen, "Calibrating RGB-D sensors to medical image scanners," US Patent #9,633,435.
- Kai Ma, Terrence Chen, Vivek Kumar Singh, Yao-Jen Chang, Michael Wels, Grzegorz Soza, "Method and system for constructing personalized avatars using a parameterized deformable mesh," US Patent #9,524,582
- Yao-Jen Chang and Ronny Bismark, "Image-based 3D panorama," US Patent #9,269,187.
- Ching-Chun Huang and Yao-Jen Chang, "Method and System for Object Detection and Tracking," ROC Patent #I348659 (filed in Oct. 2007; awarded in Sept. 2011), US Patent #7929730 (filed in Dec. 2007; awarded in Apr. 2011).
- Ching-Chun Huang, Yao-Jen Chang, Ruei-Cheng Wu, and Cheng-Peng Kuan, "System and Method of Image-based Space Detection," ROC Patent pending (filed in Sept. 2007), US Patent #8059864 (filed in Apr. 2008; awarded in Nov. 2011).
- Yao-Jen Chang, "Learning and Assessment Method and Device using a Virtual Tutor," ROC Patent #I286717(filed in Aug. 2006; awarded in Sept. 2007), US Patent #8021160 (filed in Oct. 2006; awarded in Sept. 2011).
- Yao-Jen Chang, Wende Zhang, and Tsuhan Chen, "Biometrics-based Cryptographic Key Generation System and Method," ROC Patent #I249314 (filed in Oct. 2004; awarded in Feb. 2006), US Patent #7804956 (filed in Mar. 2005; awarded in Sept. 2010).
- Chia-Wen Lin, Yao-Jen Chang, and Yung-Chang Chen, "Face Assisted Video Coding and Video Transcoding," ROC Patent #178082 (filed in Aug. 2001; awarded in May 2003).
- Yao-Jen Chang, Chia-Wen Lin, and Yung-Chang Chen, "Automatic Face Detector and Tracker in Color Video Sequences," ROC Patent #127588 (filed in Jun. 1999; awarded in Feb. 2001).
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