My interests lie in marrying physical systems with the right underlying mathematics. This has led me to pursue several application areas. I’m always willing (though not always available) to investigate new problems esp. on topics listed under “Theory”, so if you feel I can keep company or help in your research endeavors, feel free to drop me a note.

• Multi-dimensional and statistical signal processing: lattice theory, detection-estimation theory
• Applied linear algebra: dimensionality-reduction; signal representation, wavelets
• Optimization theory, convex analysis

• Multimedia security: robust signal hashing; data hiding; signal processing in the presence of adversaries
• Signal processing for statistical learning: algorithms for multi-dimensional regression and interpolation, genomic signal processing
• Color image processing: non-separable color transformations, lattice design for color look-up tables
• Image halftoning: Modeling and analysis of error-diffusion, printer-modeling

• Awarded 2007 RES Young Engineer of the Year
• Hashing and Watermarking in Wireless Data in Bits and Bytes Magazine, July 2005
• Clustering Algorithms for Perceptual Image Hashing, amongst selected tutorials on Research Channel.org
• “2-D color calibration technology” R&D Magazine Newsletter, Oct 2003.

1. O. Bulan, G. Sharma and V. Monga, “Halftone data hiding via dot orientation modulation”, submitted to IEEE Transactions on Information, Forensics and Security, Sep 2008.
2. V. Monga, B. Coskun, and M. Kivanc Mihcak, “Watermark detection under geometric attacks: A new synchronization paradigm via randomized perceptual hashing”, submitted to IEEE Transactions on Information Forensics and Security, Nov. 2008
3. Y. Altug, K. Mihcak, , Onur Ozyesil and V. Monga, “Reliable Communications with Asymmetric Codebooks: An Information Theoretic Analysis of signal hashing” under review, submitted to IEEE Transactions on Information Theory, Sep 2008
4. V. Monga and K. Mihcak “Robust and Secure Image Hashing Via Non-negative Matrix Approximations”, IEEE Transactions on Information Forensics and Security, volume 2, issue 3, pp. 376-390, Sep. 2007.
5. V. Monga and B. L. Evans, ``Perceptual Hashing via Image Feature Points: Performance Evaluation and Trade-offs'', IEEE Transactions on Image Processing, vol. 15, no. 11, pp. 3452-3465, Nov. 2006.
6. V. Monga, A. Banerjee, and B. L. Evans, ``A Clustering Based Approach to Perceptual Image Hashing'', IEEE Transactions on Information Forensics and Security, vol. 1, no. 1, pp. 68-79, March 2006.
7. N. Damera-Venkata, J.Yen, V. Monga, and B. L. Evans, ``Hardcopy Image Barcodes Via Block Error Diffusion'', IEEE Transactions on Image Processing, vol. 14, no. 12, pp. 1977-1989, Dec. 2005
Conference
8. O. Bulan, V. Monga and G. Sharma, “High capacity color barcodes via dot orientation and color separability”, in Proc. SPIE Electronic Imaging, Multimedia Security Session, Jan 2009, San Jose, CA.
9. O. Bulan, G. Sharma, and V. Monga, “Image Adaptive Decoding for Halftone Orientation Modulation Data Hiding”, IEEE Int. Conf. on Image Processing, San Diego, Oct 2008
10. O. Bulan, V. Monga and G. Sharma, “On the Capacity of Orientation Modulation Halftone Channels”, IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Las Vegas, March 2008.
11. O. Bulan, V. Monga, G. Sharma, and B. Oztan, “Data Hiding in Hardcopy Images Via Halftone Dot Orientation Modulation” in Proc. SPIE Annual Electronic Imaging Symposium, Multimedia Security Session, Jan 2008, San Jose, CA.
12. O. Harmanci, V. Monga and K. Mihcak, “Geometrically Invariant Watermarking via Robust Perceptual Hashes”, Proc. IEEE Int. Conf. on Image Processing, Oct 8-11th, Atlanta, Georgia, 2006.
13. V. Monga and K. Mihcak, “Robust Image Hashing Via Non-negative Matrix Factorizations”, Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Proc., May 15th-19th, Toulouse, France 2006
14. V. Monga, D. Vats and B. L. Evans, ``Image Authentication Under Geometric Attacks Via Structure Matching'', Proc. IEEE Int. Conf. on Multimedia and Expo, pp. 200-203, Netherlands, 2005.
15. V. Monga and B. L. Evans, ``Robust Perceptual Image Hashing Using Feature Points'', Proc. IEEE Int. Conf. on Image Processing, Oct. 24-27, 2004, Singapore.
Color Image Processing: Image Halftoning and Computational Color
Journal
16. M. Parmar , J. McElvain, V. Monga, and C. Hains, “Macro to Micro: A New Paradigm for estimating printer misregistration” IEEE Transactions on Image Processing, submitted.
17. V. Monga, S. Wang and R. Bala, “Channel-separable halftone independent methods for color drift correction”, SPIE Journal of Electronic Imaging, vol. 17, issue 1, p. 013003, 2008.
18. V. Monga, N. Damera-Venkata, and B. L. Evans, ``Design of Tone Dependent Color Error Diffusion Halftoning Systems'', IEEE Transactions on Image Processing, vol. 16, no. 1, pp. 198-211, Jan. 2007.
19. N. Damera-Venkata, B. L. Evans, and V. Monga, ``Color Error Diffusion Halftoning'', IEEE Signal Processing Magazine, invited paper in Special Issue on Digital Halftoning, vol. 20, no. 4, pp. 51-58, July 2003.
20. V. Monga , W. S. Geisler, and B. L. Evans, ''Linear, Color Separable, Human Visual System Models for Vector Error Diffusion Halftoning'', IEEE Signal Processing Letters, vol. 10, no. 4, pp. 93-97, Apr. 2003
21. R. Bala, G. Sharma, V. Monga and J. P. V. Capelle, “Two-dimensional transforms for device color-correction and calibration”, IEEE Transactions on Image Processing, vol. 14, no. 8, pp. 1172-1186, Aug 2005.
Conference
22. V. Monga, S. Wang and R. Bala, “Halftone Independent Methods for Color Drift Correction” SPIE Annu. Symposium on Electronic Imaging, Color Imaging: Processing, Hardcopy, and Applications, Jan 2007, San Jose, CA.
23. V. Monga and B. L. Evans, ``Tone Dependent Color Error Diffusion'', Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Proc., May 17-21, 2004, Montreal, Canada
24. V. Monga, N. Damera-Venkata, and B. L. Evans, ``An Input-Level Dependent Approach to Color Error Diffusion'', Proc. IS&T/SPIE Conf. on Color Imaging: Processing, Hardcopy, and Applications IX, Jan. 18-22, 2004, Santa Clara, CA USA
25. B. L. Evans, V. Monga, and N. Damera-Venkata, ``Variations on Error Diffusion: Retrospectives and Future Trends'', SPIE/IS&T Int. Conf. on Color Imaging: Processing, Hardcopy, and Applications, Jan. 20-24, 2003, Santa Clara, CA, invited paper
26. J. McElvain, V. Monga, M. Parmar, and C. Hains, “Estimating Printer Misregistration from Color Shifts: A New Paradigm” Proc. SPIE Annual Electronic Imaging Symposium, Color Imaging: Hardcopy and Applications, Jan 2008.
27. V. Monga and R. Bala, “Two-dimensional color correction: Recent Advances” Proc. IS&T/SID 14th Color Imaging Conference, Nov. 5th-8th, 2007.
28. V. Monga, R. Bala and G. Sharma, ``Two-dimensional transforms for device color calibration'', Proc. SPIE/IS&T Int. Conf. On Color Imaging: Processing, Hardcopy, and Applications IX, Jan. 18-22, 2004, Santa Clara, CA USA
29. R. Bala, G. Sharma and V. Monga, ``Two-dimensional color-correction transforms'', IS&T/SID Eleventh Color Imaging Conference, November 4-7, 2003
Statistical Learning and Applications
30. S. Chen, V. Monga and P. Moulin, “Meta-classifiers for multi-modal document classification”, IEEE Int. Workshop on Multimedia Signal Processing, 2009 accepted.
31. V. Monga, “Shaped local regression with application in approximating color transforms”, IS&T Color Imaging Conference, 2009 accepted for publication.
32. V. Monga, K. Mihcak “Distortion matched signal hashing via Bregman optimal matrix approximations”, IEEE Transactions on Signal Processing, submitted Sep 2008.
33. V. Monga and R. Bala, “Sort-Select-Damp (SSD): An efficient strategy for look-up table (LUT) lattice design” Proc. IS&T Color Imaging Conference, Nov. 2008.
34. V. Monga, A. Banerjee, and B. L. Evans, ``Clustering Algorithms for Perceptual Image Hashing'', Proc. IEEE Int. Digital Signal Processing Workshop, Aug. 1-4, 2004, Taos, NM

1. Perceptual Signal Hashing: Theory and Applications, Queens University, Ontario, Canada, Oct 2008.
2. “Perceptual Image Hashing: Methods and Applications”, invited talk at the IEEE Aerospace and Communications Joint Chapter Meeting,, co-sponsored by the Center for Electronic Imaging Systems, July 2007, Rochester, NY.
3. “Matrix valued filters for color image processing”, invited talk at Texas Instruments, Dallas, Texas, June 2005
4. “Robust Image Hashing: Search, Identification and Beyond”, invited talk at HP Labs, May 2005, Palo Alto, CA.
5. “Clustering Algorithms for Perceptual Image Hashing”, invited talk at Microsoft Research, Feb 2005, Redmond, WA.
6. “Variations on Error Diffusion: Retrospectives and Future Trends” delivered jointly with Prof. Brian L. Evans, SPIE Electronic Imaging Annual Meeting, Jan 2003, San Jose, CA.

1. V. Monga, “A method for identifying images under distortion via noise characterization and bregman optimal matrix approximations”, Xerox Corporation filed with US patent office in August 2007.
2. J. McElvain, V. Monga “Mis-registration estimation via a broadband multi-channel scanning device” Xerox Corporation filed with US patent office in May 2007.
3. V. Monga, “A method for identifying images in a database after cropping”, Xerox Corporation filed with US patent office in April 2007.
4. V. Monga and R. Bala, “Device Calibration with accurate planar control”, Xerox Corporation filed with the US patent office in Feb. 2007
5. V. Monga and R. Bala, “Device Calibration Incorporating Grey Component Replacement Strategies” Xerox Corporation filed with the US patent office in Dec. 2006
6. V. Monga, S. Wang and R. Bala, “Halftone Independent Color Drift Correction”, Xerox corporation no. 20041163, filed with the US patent office in Dec 2005.
7. V. Monga and K. Mihcak, “A Method for Digital Goods Representation and Protection Via Non-negative Matrix Factorizations”, Microsoft Corporation no. 314318, filed with the US patent office in Oct 2005.
8. O. Harmanci, V. Monga and K. Mihcak, “Digital Fingerprinting Using Synchronization Marks and Watermarks”, Microsoft Corporation no. 314867, filed with the US patent office in Nov. 2005.

Over 15 other applications filed and pending.

1. Vishal Monga, Niranjan Damera-Venkata, and Brian L. Evans, “Matlab Halftoning Toolbox”, copyright? 1999-2002 The University of Texas. Collection of forward grayscale and color image halftoning methods for printing and displaying images, and figures of merit for evaluation of the methods. Version 1.1 is available at http://www.ece.utexas.edu/~bevans/projects/halftoning/toolbox/index.html
2. Vishal Monga, Divyanshu Vats, and Brian L. Evans, "Image Hashing Toolbox, Version 0.1 beta, released June 18, 2006.