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Group Member

	Yao-Jen Chang Research Scientist Personal Homepage:  http://www.andrew.cmu.edu/~yaojen Email: kevinchang at cmu.edu
	Office: Porter Hall B23 Lab: Porter Hall B6 Phone: 412-268-4464 Fax: 412-268-3890	Mailing Address: Department of ECE, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213-3890

[Research Interests]        [Project]      [Publications] 

Research Focus:

• 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.

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	Active Image-based Rendering with Robot-based Imaging Testbed The Robot-based Imaging Test-bed (RIT) is an open source toolkit designed to be used with a network of wireless robots with imaging cameras. The toolkit will provide the infrastructure for wireless networking, overhead camera localization, path planning, path following and image processing. Developers can install various high level applications to use the base classes provided by the toolkit for test purposes. The focus is to construct a robust and well documented system that is easy to manipulate and expand upon while providing a wide range of image processing and distributed robotics capability. Please refer to the Robot-based Imaging Test-bed page for more information.
	Software Development Toolkit for Video Surveillance As computers become more powerful, they facilitate the possibility of more sophisticated and more powerful tracking algorithms. The knowledge gap between the novice and the expert continues to widen. Even for experts, there can be a significant time cost to instantiate an algorithm - even if it is for comparison purposes only. Enter ICTrack. Our goal is two fold. For the novice, we create a flexible interface that the novice can use to manipulate advanced algorithms without having to know the sometimes pedantic details. For the expert, we provide a framework for developing new algorithms and testing them verus existing techniques. Please refer to the ICTrack project page for more information.
	Algorithms for Key Generation based on Biometrics  Instead of using PINs and passwords as cryptographic keys that are either easy to forget or vulnerable to dictionary attacks, easy-to-carry and difficult-to-transfer keys can be generated based on user-specific biometric information. In this paper, a framework is proposed to generate stable cryptographic keys from biometric data that is unstable in nature. The proposed framework differs from prior work in that user-dependent transforms are utilized to generate more compact and distinguishable features. Thereby, a longer and more stable bitstream can be generated as the cryptographic key. Please refer to the Key generation based on biometrics project page for more information.

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Journal Papers:

• 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.

• 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.

• 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.  

Conference Papers: 

• Ching-Chun Huang, Sheng-Jyh Wang, Yao-Jen Chang, and Tsuhan Chen, " A Bayesian Hierarchical Detection Framework for Parking Space Detection," accepted by 2008 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP-2008), Las Vegas, NV, USA, Mar. 30-Apr. 4, 2008.

• 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 2007 First 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'05), Los Angeles, CA, USA, July 29-31, 2005. (Abstract, PDF, and Video)

• 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. 

• 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.

• 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 Int. 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.

• 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 ISCE98, pp.WAA2-17~20, Taipei, Taiwan, Oct. 19-21, 1998.

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