V. Chandrasekhar - Research Areas

I have grouped my research work into different topics here. Over the years, I have had the opportunity to work with a lot of wonderful people on a wide range of topics.

For a complete list of publications in chronological order, please go to the Publications tab.

Research Topics

  1. Deep Learning

  2. Egocentric Vision

  3. Compact Descriptors for Visual Search

  4. Image and Video Retrieval

  5. Streaming Augmented Reality

  6. Audio Classification and Retrieval

  7. Sensor Networks

Deep Learning

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List of Publications

  1. G. Manek, L. Jie, V. Chandrasekhar(joint), L. Duan, T. Poggio, "Pruning Convolutional Neural Networks for Image Instance Retrieval". In review for Signal Processing Letters, 2017.

  2. J. Lin, S. Wang, Y. Bai, Y. Lou, V. Chandrasekhar, L. Duan, T. Huang, A. C. Kot, W. Gao, "HNIP: Compact Deep Invariant Representations for Video Matching, Localization and Retrieval", Transactions on Multimedia, 2017 (Paper)

  3. Z. Wang, K. Kuan, M. Ravaut, G. Manek, S. Song, F. Yuan, K. Seokhwan, N. Chen, L. F. D. Enriquez, L. A. Tuan, H. Zhu, Z. Zeng, N. M. Cheung, G. Piliouras, J. Lin, V. Chandrasekhar, " Truly Multi-modal YouTube-8M Video Classification with Video, Audio, and Text", In submission. (Paper)

  4. K. Kuan, M. Ravaut, G. Manek, H. Chen, J. Lin, B. Nazir, C. Chen, T. C. Howe, Z. Zeng, V. Chandrasekhar, "Deep Learning for Lung Cancer Detection: Tackling the Kaggle Data Science Bowl 2017 Challenge", In submission. (Paper)

  5. A. G. Molino, B. Mandal, L. Jie, J. H. Lim, V. Subbaraju, V. Chandrasekhar, "VC-I2R@ImageCLEF2017: Ensemble of Deep Learned Features for Lifelog Video Summarization", In submission.

  6. Y. Bai, L. Jie, V. Chandrasekhar, Y. Lou, S. Wang, L. Duan, T. Huang, A. Kot, "Deep Regional Feature Pooling for Video Matching", Proceedings of the IEEE Conference on Image Processing 2017, Beijing, China. (Paper)

  7. K. Kuan, G. Manek, L. Jie, F. Yuan, V. Chandrasekhar, "Region Average Pooling for Context-aware Object Detection". Proceedings of the IEEE Conference on Image Processing 2017, Beijing, China. (Paper)

  8. F. Yuan, K. Kuan, L. Jie, C. Tan, V. Chandrasekhar, "Object Detection Meets Knowledge Graphs", Proceedings of International Joint Conference on Artifical Intelligence (IJCAI), Australia. (Paper)

  9. O. Morere, L. Jie, A. Veillard, L.Duan, V. Chandrasekhar, T. Poggio, "Nested Invariance Pooling and RBM Hashing for Image Instance Retrieval", Proceedings of ACM International Conference on Multimedia Retrieval (ICMR), Bucharest, Romania, 2017. Oral Presentation. (Paper)

  10. J. Lin, O. Morere, A. Veillard, L. Duan, H. Goh, V. Chandrasekhar, “Deep Hash: Getting Depth, Reguarlization and Fine Tuning Right”, Proceedings of ACM International Conference on Multimedia Retrieval (ICMR), Bucharest, Romania, 2017. Oral Presentation. (Paper)

  11. V. Chandrasekhar, J. Lin, Q. Liao, O. Morere, A. Veillard, L. Duan, T. Poggio, "Compression of Deep Neural Networks for Image Instance Retrieval", Proceedings of Data Compression Conference, Snowbird, Utah, 2017. (Paper)

  12. Y. Lou, Y. Bai, J. Lin, S. Wang, J. Chen, V. Chandrasekhar, L. Duan, T. Huang, A. C. Kot, W. Gao, "Compact Deep Invariant Descriptors for Video Retrieval", Proceedings of Data Compression Conference, Snowbird, Utah, 2017. (Paper)

  13. O. Morere, A. Veillard, J. Lin, J. Petta, V. Chandrasekhar, T. Poggio, "Group Invariant Deep Representations for Image Instance Retrieval", Proceedings of AAAI Symposium on Science of Intelligence, Stanford, CA, 2017. (Paper)

  14. V. Chandrasekhar, L. Jie, O. Morere, H. Goh, A. Veillard "A Practical Guide to CNNs and Fisher Vectors for Image Instance Retrieval", Proceedings of Signal Processing, 2016. (Paper)

  15. S. Song, V. Chandrasekhar, B. Mandal, L. Li, J. H. Lim, G. S. Babu, P. P. San, N. M. Cheung, "Multimodal Multi-Stream Deep Learning for Egocentric Activity Recognition", Proceedings of CVPR Workshop on Egocentric Vision 2016. (Paper)

  16. L. Jie, O. Morere, V. Chandrasekhar, A. Veillard, H. Goh, "Co-Sparsity Regularized Deep Hashing for Image Instance Retrieval", Proceedings of ICIP 2016. (Paper)

  17. O. Morere, A. Veillard, L. Jie, J. Petta, V. Chandrasekhar, T. Poggio, "Group Invariant Deep Representations for Image Instance Retrieval", Center for Brains, Minds and Machines, MIT (CBMM) Report 2016. (Paper)

  18. J. Lin, J. Petta, O. Morere, V. Chandrasekhar,, A. Veillard, “Tiny Descriptors for Image Retrieval with Unsupervised Triplet Hashing”, Proceedings of DCC 2016. (Paper)

  19. J. Lin, O. Morere, V. Chandrasekhar,, A. Veillard, H. Goh, “Deep Hash: Getting Depth, Reguarlization and Fine Tuning Right”, Arxiv 2015 (Paper)

  20. O. Morere, H. Goh, A. Veillard, V. Chandrasekhar,, J. Lin, “Co Regularized Deep Representations for Video Summarization”, Proceedings of ICIP 2015 (Paper)

  21. Vijay Chandrasekhar, Jie Lin, Olivier Morere, Antoine Veillard, Hanlin Goh, "Compact Global Descriptors for Visual Search", Proceedings of Data Compression Conference, Snowbird, Utah, March 2015. (Paper)

  22. O. Morere, H. Goh, A. Viellard, V. Chandrasekhar, "Large Scale Image Classification on a Shoe String" (ImageNets 2014 Submission), ImageNet Large Scale Visual Recognition Challenge, European Conference on Computer Vision, Zurich, Switzerland, September 2014. (Paper)

Egocentric Vision

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List of Publications

  1. G. Tian, Y. Wong, B. Mandal, V. Chandrasekhar, Liyuan Li, J. H. Lim and M. Kankanhalli, "Recovering Social Interaction Spatial Structure from Multiple First-person Views", Proceedings of 3rd International Workshop on Socially Aware Multimedia, ACM Multimedia Conference, Orlando, Florida, November 2014. (Paper)

  2. Bappaditya Mandal, Chia Shue Ching, Liyuan Li, Vijay Chandrasekhar, Cheston Tan Yin Chet, Lim Joo Hwee, "A Wearable Face Recognition System on Google Glass for Assisting Social Interactions", 3rd International Workshop on Mobile and Egocentric Vision, Asian Conference on Computer Vision, Singapore, December 2014. (Paper)

  3. Sibo Song, Vijay Chandrasekhar, Ngai-Man Cheung, Sanath Narayan, Liyuan Li, Joo-Hwee Lim, "Activity Recognition in Egocentric Life-logging Videos", 3rd International Workshop on Mobile and Egocentric Vision, Asian Conference on Computer Vision, Singapore, December 2014. (Paper)

  4. V. Chandrasekhar, W. Min, L. Xiaoli, C. Tan, L. Liyuan and Joo-Hwee Lim, "Incremental Graph Clustering for Efficient Retrieval from Streaming Egocentric Video Data", Proceedings of International Conference on Pattern Recognition, Stockholm, Sweden, August, 2014. (Paper)

  5. C. Tan, H. Goh, V. Chandrasekhar, L. Liyuan, Joo-Hwee Lim, "Understanding the Nature of First Person Videos: Characterization and Classification Using Low Level Features", Proceedings of CVPR Workshop on Egocentric Vision, Columbus, OH, June 2014. (Paper)

  6. V. Chandrasekhar, Wu Min, Xiao Li, Cheston Tan, Bappaditya Mandal, Liyuan Li, Joo Hwee Lim , "Efficient Retrieval from Large-Scale Egocentric Visual Data Using a Sparse Graph Representation", Proceedings of CVPR Workshop on Egocentric Vision, Columbus, OH, June 2014. (Paper)

Compact Descriptors for Visual Search

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List of Publications

  1. Vijay Chandrasekhar, Jie Lin, Olivier Morere, Antoine Veillard, Hanlin Goh, "Compact Global Descriptors for Visual Search", Proceedings of Data Compression Conference, Snowbird, Utah, March 2015. (Paper)

  2. V. Chandrasekhar, D. Chen, M. Makar, S. Tsai, G. Takacs, B. Girod, "Feature Matching Performance of Compact Descriptors for Visual Search", Proceedings of Data Compression Conference (DCC), Snowbird, Utah, March 2014. (Paper)

  3. B. Girod, V. Chandrasekhar, R. Grzeszczuk, and Y. Reznik, "Mobile Visual Search: architectures, technologies, and emerging MPEG standard," IEEE Multimedia, vol. 18, no. 3, pp. 86-94, 2011. (Paper)

  4. V. Chandrasekhar, G. Takacs, D. M. Chen, S. S. Tsai, R. Grzeszczuk, Y. Reznik, and B. Girod, "Compressed Histogram of Gradients: A low bitrate descriptor", Proceedings of Special Issue on Mobile Vision, International Journal on Computer Vision, 2011. (Paper)

  5. S. S. Tsai, D. Chen, V. Chandrasekhar, G. Takacs, M. Makar, R. Grzeszczuk, and B. Girod, "Improved coding for image feature location information", Proceedings of SPIE Applications of Digital Image Processing (ADIP), San Diego, CA, August 2012. (Paper)

  6. V. Chandrasekhar, Y. Reznik, G. Takacs, D. M. Chen, S. S. Tsai, R. Grzeszczuk, and B. Girod, "Compressing Feature Sets with Digital Search Trees", Proceedings of Mobile Vision Workshop, International Conference on Computer Vision (ICCV), Barcelona, Spain, November 2011. (Paper)

  7. V. Chandrasekhar, S. S. Tsai, Y. Reznik, G. Takacs, D. M. Chen, and B. Girod, "Compressing a set of CHoG features", Proceedings of SPIE Workshop on Applications of Digital Image Processing (ADIP), San Diego, August 2011. (Paper)

  8. V. Chandrasekhar, S. S. Tsai, G. Takacs, D. M. Chen, N. M. Cheung, Y. Reznik, R. Vedantham, R. Grzeszczuk and B. Girod, "Low Latency Image Retrieval with Progressive Transmission of CHoG Descriptors", Proceedings of Mobile Cloud Media Computing, ACM Multimedia Conference,Florence, Italy, October 2010. (Paper)

  9. V. Chandrasekhar, D. M. Chen, A. Lin, G. Takacs, S. S. Tsai, N. M. Cheung, Y. Reznik and B. Girod, "Comparison of Local Feature Descriptors for Mobile Visual Search", Proceedings of International Conference on Image Processing (ICIP), Hong Kong, Sep 2010. (Paper)

  10. V. Chandrasekhar, M. Makar, G. Takacs, D. M. Chen, S. S. Tsai, R. Grzeszczuk and B. Girod, "Survey of SIFT compression schemes", Proceedings of International Conference on Pattern Recognition (ICPR), Istanbul, Turkey, August 2010. (Paper)

  11. Y. Reznik, V. Chandrasekhar, G. Takacs, D. M. Chen, S. S. Tsai and B. Girod, "Fast Quantization and Matching of Histogram-based Image Feature Descriptors", Proceedings of SPIE Applications of Digital Image Processing Conference, San Diego, August 2010. (Paper)

  12. V. Chandrasekhar, Y. Reznik, G. Takacs, D. M. Chen, S. S. Tsai, R. Grzeszczuk and B. Girod, "Quantization Schemes for the Compressed Histogram of Gradients descriptor", Proceedings of International Workshop on Mobile Vision, Computer Vision and Pattern Recognition (CVPR), San Francisco, June 2010. (Paper)

  13. S. Tsai, D. Chen, Gabriel Takacs, V. Chandrasekhar, Jatinder Singh, B. Girod, "Location Coding for Mobile Image Retrieval Systems", Proceedings of Mobimedia, London, UK, September 2009. (Paper)

  14. V. Chandrasekhar, D. Chen, Zhi Li, Gabriel Takacs, Sam S. Tsai, Radek Grzeszczuk, B. Girod, "Low-Rate Image Retrieval with Tree Histogram Coding", Proceedings of Mobimedia, London, UK, September 2009. (Paper)

  15. V. Chandrasekhar, Gabriel Takacs, D. Chen, S. Tsai, R. Grzeszczuk, B. Girod, "CHoG: Compressed Histogram of Gradients - A low bit rate descriptor", Proceedings of IEEE Conference on Computer Vision and Pattern Recognition, Miami, June 2009. . Oral Presentation (4% acceptance). (Paper)

  16. V. Chandrasekhar, Gabriel Takacs, B. Girod, et. al, "Transform Coding of Feature Descriptors", Proceedings of Visual Communication and Image Processing, San Jose, January 2009. (Paper)

Image and Video Retrieval

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List of Publications

  1. Y. Wu, L. Duan. Z. Wang, L. Yang, Y. Huang, J. Lie, V. Chandrasekhar, J. Yuan, W. Gao, "A Compact Binary Descriptor via Dual Selection for Visual Search". Submitted to Transactions on Image Processing (TIP), 2017.

  2. L. Duan, V. Chandrasekhar, S. Wang, Y. Lou, J. Lin, Y. Ban, T. Huang, A. C. Kot, W. Gao, "Compact Descriptor for Video Analysis: the Emerging MPEG Standard", In review for IEEE Multimedia Magazine, 2017. (Paper)

  3. Y. Huang, L. Duan, Z. Wang, L. Jie, V. Chandrasekhar, T. Huang, "A Multi-Block N-ary Trie Structure for Exact R-neighbor Search in Hamming Space", Proceedings of the IEEE Conference on Image Processing 2017, Beijing, China. (Paper)

  4. A. Araujo, M. Makar, V. Chandrasekhar, D. Chen, S. Tsai, H. Chen, R. Angst, B. Girod, "Efficient Video Search Using Image Queries", Proceedings of International Conference on Image Processing, France, October, 2014. (Paper)

  5. G. Takacs, V. Chandrasekhar, S. S. Tsai, D. M. Chen, R. Grzeszczuk, B. Girod, "Fast computation of rotation-invariant image features by an approximate radial gradient transform", IEEE Transactions on Image Processing, Vol. 22, No. 8, August 2013. (Paper)

  6. G. Takacs, V. Chandrasekhar, S. S. Tsai, D. M. Chen, R. Grzeszczuk, B. Girod, "Rotation Invariant Fast Features for Large Scale Recognition and Real-time Tracking", Signal Processing: Image Communication, Vol. 28, No. 4, April 2013. (Paper)

  7. D. Chen, S. S. Tsai, V. Chandrasekhar, R. Vedantham, R. Grzeszczuk, B. Girod, "Residual enhanced visual vector as a compact signature for mobile visual search", Signal Processing, Vol. 93, No. 8, August 2013 (Paper)

  8. B. Girod, V. Chandrasekhar, D. M. Chen, N. M. Cheung, R. Grzeszczuk, Y. Reznik, G. Takacs, S. S. Tsai and R. Vedantham, "Mobile Visual Search", Proceedings of Special Issue: Mobile Media Search, IEEE Signal Processing Magazine, 2011. (Paper)

  9. G. Takacs, V. Chandrasekhar, S. S. Tsai, D. M. Chen, R. Grzeszczuk, B. Girod, "Rotation Invariant Fast Features for Large Scale Recognition and Real-time Tracking", Proceedings of SPIE Applications of Digital Image Processing, San Diego, CA, August 2012. (Paper)

  10. D. M. Chen, S. S. Tsai, V. Chandrasekhar, G. Takacs, H. Chen, R. Vedantham, R. Grzeszczuk, and B. Girod, "Residual enhanced visual vectors for on-device image matching", Proceedings of Asilomar Conference, Pacific Grove, CA, November 2011. (Paper)

  11. S. S. Tsai, D. M. Chen, V. Chandrasekhar, G. Takacs, N. M. Cheung, R. Vedantham, R. Grzeszczuk and B. Girod, "Mobile Product Recognition", Proceedings of ACM Multimedia Conference,Florence, Italy, Sep 2010. (Paper)

  12. S.S.Tsai, D. M. Chen,G.Takacs, V. Chandrasekhar, R. Vedantham, R. Grzeszczuk, and B. Girod, "Fast Geometric Reranking for Image based Retrieval", Proceedings of International Conference on Image Processing (ICIP), Hong Kong, Sep 2010. (Paper)

  13. D. M. Chen, N. M. Cheung, S. S. Tsai, V. Chandrasekhar, G. Takacs, R. Vedantham, R. Grzeszczuk and B. Girod, "Dynamic Selection of a Feature Rich Query Frame for Accurate and Low-latency Mobile Video Search", Proceedings of International Conference on Image Processing (ICIP), Hong Kong, Sep 2010. (Paper)

  14. G. Takacs, V. Chandrasekhar, Huizhong Chen, D. M. Chen, S. S. Tsai, R. Grzeszczuk and B. Girod, "Permutable Descriptors for Orientation-Invariant Matching", Proceedings of SPIE Applications of Digital Image Processing Conference, San Diego, August 2010. (Paper)

  15. D. M. Chen, S. S. Tsai, V. Chandrasekhar, G. Takacs, R. Vedantham, R. Grzeszczuk and B. Girod, "Inverted Index Compression for Scalable Image Matching", Proceedings of Data Compression Conference (DCC), Snowbird, Utah, March 2010. (Paper)

  16. D. Chen, S. Tsai, V. Chandrasekhar, Gabriel Takacs, Jatinder Singh, B. Girod, "Tree Histogram Coding for Mobile Image Matching", Proceedings of Data Compression Conference (DCC), Snowbird, Utah, March 2009. (Paper)

  17. D. Chen, S. Tsai, V. Chandrasekhar, G. Takacs, J.Singh, B.Girod, "Robust image retrieval using multi-view scalable vocabulary trees", Proceedings of Visual Communication and Image Processing, San Jose, January 2009. (Paper)

Streaming Augmented Reality

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List of Publications

  1. M. Makar, S. Tsai, V. Chandrasekhar, D. M. Chen, B. Girod, "Interframe Coding of Canonical Patches for Low Bitrate Mobile Augmented Reality", International Journal of Semantic Computing, Vol. 7, No. 1, March 2013. (Paper)

  2. M. Makar, S. S. Tsai, V. Chandrasekhar, D. M. Chen, B. Girod, "Inter-frame Coding of Canonical Patches for Mobile Augmented Reality", Proceedings of IEEE International Symposium on Multimedia (ISM), Irvine, CA, December 2012 (Top 5 Papers). (Paper)

  3. G. Takacs, V. Chandrasekhar, D. M. Chen, S. S. Tsai, R. Grzeszczuk and B. Girod, "Unified Real-Time Tracking and Recognition with Rotation-Invariant Fast Features", Proceedings of Computer Vision and Pattern Recognition (CVPR) Conference, San Francisco, June 2010. (Paper)

  4. Gabriel Takacs, V. Chandrasekhar, B.Girod et. al, "Outdoors Augmented Reality on Mobile Phone using Loxel based Visual Feature Organization", Proceedings of ACM Multimedia Information Retrieval (MIR), Vancouver, Canada, October 2008. Oral Presentation (20% acceptance). (Paper)

  5. V. Chandrasekhar, Gabriel Takacs, B. Girod, R. Grzeszczuk, "Feature Tracking for Mobile Augmented Reality using Video Coder Motion Vectors", Proceedings of the Sixth IEEE and ACM International Symposium on Mixed and Augmented Reality (ISMAR 07), Nara, Japan, November 13-16 2007. (Paper)

Audio Classification and Retrieval

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List of Publications

  1. V. Chandrasekhar, M. Sharifi, D. Ross, "Survey and evaluation of audio fingerprinting schemes for mobile audio search", Proceedings of International Symposium on Music and Information Retrieval (ISMIR), Miami, Florida, October 2011. (Paper)

  2. V. Chandrasekhar, E. Sargin, D. Ross, "Automatic Language Identification in Music Videos", Proceedings of International Conference on Acoustic and Signal Processing (ICASP), Prague, Czechoslovakia, May 2011. (Paper)

Sensor Networks

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List of Publications

  1. V. Chandrasekhar, Winston KG Seah, Yoo Sang Choo, How Voon Ee, "Localization in Underwater Sensor Networks: Survey and challenges", Proceedings of the ACM Workshop on Underwater Networks (WUWNETS),ACM MobiCom, Los Angeles, CA, Sep 25-29, 2006. (Paper)

  2. Vijay R. Chandrasekhar, Zhi Ang Eu, Winston KG Seah, Venkatesh Pillai, "Experimental Analysis of Area Localization Scheme for Sensor Networks", Proceedings of IEEE Wireless Communications and Networking Conference (WCNC), Hong Kong, March 11-15, 2007. (Paper)

  3. V. Chandrasekhar, Winston KG Seah, "Area Localization Scheme for Sensor Networks", Proceedings of IEEE OCEANS Asia Pacific Conference, Singapore, May 16-19, 2006. (Paper)

  4. Jeffrey HS Tay, V. Chandrasekhar and Winston KG Seah, "Selective Iterative Multilateration for Hop Count-Based Localization in Wireless Sensor Networks", Proceedings of the Workshop on Mobile Location-Aware Sensor Networks (MDM), Nara, Japan, May 9-13, 2006. (Paper)

  5. Jeffrey HS Tay, V. Chandrasekhar and Winston KG Seah, "Range-free Localization Using Dynamic Hop Size Computation in Wireless Sensor Networks", Proceedings of the IEEE Conference on Industrial Informatics (INDIN), Singapore, August 16-18, 2006. (Paper)