Challa Subrahmanya Sastry


Department of Mathematics, IIT Hyderabad

csastry (AT) iith (DOT) ac (DOT) in
Office: 503, C-Block
Phone (Office): +91 40 2301 6072


Wavelets, Sparse Representation Theory and Inverse Problems






Journal Publications:


  • “A Novel Low-complexity Compressed Data Aggregation Method for Energy-constrained IoT Networks,” To appear in IEEE Transactions on Green Communications and Networking, 2020, (with M. Amaralingam, P. K. Mishra, P Rajalakshmi, S. S. Channappayya).


  • “Ternary matrices compliant with Restricted Isometry Property: Construction and Application to image retrieval,” To appear in Journal of Combinatorics, Information and System Sciences, 2020 (with R. Naidu and M. Srinivas)


  • “Construction of highly redundant incoherent unit norm tight frames as a union of orthonormal bases,” Journal of Complexity, Vol. 54, Oct, 2019 (with P. Sasmal and P. Jampana).


  • “Reconstruction of sparse-view tomography via preconditioned Radon sensing matrix,”  J. of Applied Maths & Comp. Vol. 58, 91-104, 2019 (with P. Theeda, P. Kumar and P. Jampana).


  •  “Robust heartbeat detection from multimodal data via CNN-based generalizable information fusion” IEEE Transactions on Biomedical Engineering, Vol. 66, 710 – 717, 2019. (with S. Chandra and S. Jana).


  • “Novel light weight compressed data aggregation using sparse measurements for IoT networks,” Journal of Networks and Computer Applications, Vol. 121, 119-134, 2018 (with M. Amaralingam, P. K. Mishra, P Rajalakshmi, S. S. Channappayya).


  • “Dictionary-based monitoring of premature ventricular contractions: An ultra-low-cost point-of-care service,”  Artificial Intelligence in Medicine, Vol. 87, 91-104, 2018 (with B.S. Chandra, L. Anumandla and S. Jana).


  • "Composition of binary compressed sensing matrices," IEEE Signal Processing Letters, Vol. 23, 1096-1100, August 2016, (with P. Sasmal, R. Naidu, P.V. Jampana)


  • "Deterministic Compressed Sensing matrices: Construction via Euler squares and applications," IEEE Transactions on Signal Processing, Vol. 64, 3566-3575, July 2016, (with R. Naidu, P.V. Jampana)


  • "Reliable resource-constrained Telecardiology via Compressive detection of anomalous ECG signals," Computers in Biology and Medicine, Volume 66, 144-153, 2015 (with S. Chandra and S. Jana).


  • "Content based medical image retrieval using dictionary learning, " Neurocomputing, Vol. 168, 880-895, 2015 (with M. Srinivas, R. Naidu and C. K. Mohan)


  • "In-plane rotation and scale invariant simultaneous dictionary learning and clustering,"  IEEE Trans. on Image Processing, 22(6), 2013, (with Y. Chen, V. Patel, J.   Philips and R. Chellappa)


  • "Spectral dynamics and regularization of incompletely and irregularly measured data," Differential Equations and Dynamical Systems, Vol.  19(3), pp: 181-197, 2011.



Conference Proceedings:


  • “Minimally scaled and incoherent frames,” In Proc. of IEEE-ICSIP, 2018, China (with P. Theeda, P. Sasmal and P. Jampana).


  • “Reconstruction of sparse-view tomography via banded matrices, In LNCS, Vol. 10481, In proc. of ICVGIP, IIT Guwahati, 2016 (with P. Theeda, Praveen Kumar and P. Jampana).


  • "On the existence of equivalence class of RIP compliant matrices, " (In proc. of 11th SampTA, Washington, May 2015, with P. Sasmal and P. Jampana).


  • "Optimization of low-dose tomography via binary sensing matrices, " In Proc. of 17th IWCIA, ISI Calcutta, [Volume 9448, 337-351, Lecture Notes in Computer Science] (with T. Prasad, P. Kumar and P. Jampana).


  • "Reliable Low-Cost Telecardiology: High-Sensitivity Detection of Ventricular Beats using Dictionaries, " In Proc. 16th IEEE Healthcom, Natal, Brazil, 2014.," (with B. Chandra and S. Jana)


  • "Multivariable polynomials for the construction of binary sensing matrices," In Proc. of CMCGS, Singapore, February 2014 (with R. Naidu and P.V.Jampana)


  • "Telecardiology: Hurst exponent based anomaly detection in compressively sampled ECG Signals," In Proc. of 15th  IEEE HealthCom, Lisbon, Portugal, 2013 (with S. Chandra and S. Jana)


  • "Reconstruction from divergent ray projections," (In Proc. of SPIE Imaging, San Francisco, USA, 2012, with S. Singh)


  • "Rotation invariant simultaneous clustering and dictionary learning for image retrieval," In Proc. of IEEE-ICASSP, Kyoto, Japan, 2012 (with Y.Chen, V.Patel, J. Philips, R.Chellappa).


  • "Characterization of ECG signals using multiscale approach," In Proc. of IEEE-SPCOM, 2012, IISc Bangalore, (with K.S. Veena, P.Gupta, M. Amarnath)




Recent developments at the intersection of algebra and optimization theory -- by the name of Compressed Sensing/Compressive Sampling Theory -- aim at providing linear systems with sparse descriptions. These developments are found to have potential for several applications. My current research interests lie in Frame theory, Sparsity promoting optimization techniques and their applications in Machine Learning. My previous research, nevertheless, was directed toward Wavelets, Reconstruction problems in tomography and the Analysis of data networks.






             Dr. Ramu Naidu

             Dr. P. Sasmal

             Dr. Prasad Theeda

             Mr. Munnu Sonkar (Pursuing),

             Ms. K. Z. Najiya (Pursuing)

             Mr. Shantam Gulati (Pursuing)

             Dr. Praveen Kumar (Post Doc Fellow, June/2014 to March/2017),

             Dr. M. Priya Ranjan (PostDoc Fellow, Pursuing)






 Mathematical Methods

 Mathematics Behind Machine Learning

 Wavelets & Applications

 Theory of Frames

 Probability Theory

 Linear Algebra

 Numerical  Linear Algebra

 Numerical Analysis

 Image Processing,

 Digital Signal Processing

 Sparse Repesentaion Theory (partly)

 Several UG (B.Tech) level core Math Courses.