Single image de-raining:

H. Zhang, V. Sindagi, and V. M. Patel, and R. Chellappa, "Image de-raining using a conditional generative adversarial network," arXiv:1701.05957. (pdf)(Project page)

H. Zhang and V. M. Patel, "Convolutional sparse and low-rank coding-based rain streak removal," IEEE Winter Conference on Applications of Computer Vision (WACV), Santa Rosa, CA, 2017. (pdf).


                
         
Sparse Fourier transform:

S. Wang, V. M. Patel and A. Petropulu, "A robust sparse Fourier transform and its application in radar signal processing," IEEE Transactions on Aerospace and Electronic Systems, accepted for publication, May 2017. (pdf)

S. Wang, V. M. Patel and A. Petropulu, "A practical high dimensional sparse Fourier transform," IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), New Orleans, LA, 2017. (pdf)

S. Wang, V. M. Patel and A. Petropulu, "RSFT: A realistic high dimensional sparse Fourier transform and its application in radar signal processing,"  IEEE Military Communications Conference (MILCOM), Baltimore, MD, 2016. (pdf)



Face detection:

S. Sarkar, V. M. Patel, and R. Chellappa, "Deep feature-based face detection on mobile devices," IEEE International Conference on Identity, Security and Behavior Analysis (ISBA), Sendai, Japan, 2016. (pdf)

 R. Ranjan, V. M. Patel, and R. Chellappa, "A deep pyramid deformable part model for face detection," International Conference on Biometrics Theory, Applications and Systems (BTAS), Arlington, VA, 2015. (pdf) [Best Poster Award]







Unconstrained face recognition:

J-C. Chen, V. M. Patel, and R. Chellappa, "Unconstrained face verification using deep CNN features," IEEE Winter conference on Applications of Computer Vision (WACV), Lake Placid, NY, 2016. (pdf)

S. Sengupta, J-C. Chen, C. Castillo, V. M. Patel, R. Chellappa, and  D. Jacobs, "Frontal to profile face verification in the wild," IEEE Winter conference on Applications of Computer Vision (WACV), Lake Placid, NY, 2016. (pdf)

J-C. Chen, R. Ranjan, A. Kumar, C-H. Chen, V. M. Patel, and R. Chellappa, "An end- to-end system for unconstrained face verification with deep convolutional neural networks," IEEE International Conference on Computer Vision (ICCV) workshop on ChaLearn Looking at People (ChaLearn LaP), Santiago, Chile, 2015. (pdf)






Attribute-based user authentication:

P. Samangouei, V. M. Patel, and R. Chellappa, "Continuous user authentication on mobile devices based on facial attributes," submitted Oct. 2015. (pdf)

P. Samangouei, V. M. Patel, and R. Chellappa, "Attribute-based continuous user authentication on mobile devices," International Conference on Biometrics Theory, Applications and Systems (BTAS), Arlington, VA, 2015. (pdf) [Best Paper Award (Bronze)]







Automatic railway track inspection:

X. Gibert-Serra, V. M. Patel, and R. Chellappa, "Deep multi-task learning for railway track inspection," submitted Oct. 2015. (pdf)

X. Gibert-Serra, V. M. Patel, and R. Chellappa, "Sequential score adaptation with extreme value theory for robust railway track inspection," IEEE International Conference on Computer Vision (ICCV) workshop on Computer Vision for Road Scene Understanding and Autonomous Driving (CVRSUAD), Santiago, Chile, 2015. (pdf)

X. Gibert-Serra, V. M. Patel, and R. Chellappa, "Material classification and semantic segmentation of railway track images with deep convolutional neural networks," IEEE International Conference on Image Processing (ICIP), Quebec city, Canada, 2015. (pdf)

X. Gibert-Serra, V. M. Patel and R. Chellappa, "Robust fastener detection for autonomous visual railway track inspection," IEEE Winter conference on Applications of Computer Vision (WACV), Waikoloa Beach, HI, 2015. (pdf)




 

Visual domain adaptation:

V. M. Patel, R. Gopalan, R. Li and R. Chellappa, "Visual domain adaptation: a survey of recent advances," IEEE Signal Processing Magazine, vol. 32, no. 3, pp. 53 - 69, May 2015. (pdf)

A. Shrivastava, S. Shekhar, and V. M. Patel, "Unsupervised domain adaptation using parallel transport on Grasmann manifold," IEEE Winter conference on Applications of Computer Vision (WACV), Steamboat Springs, CO, 2014. (pdf)

 


Multiple instance learning:

A. Shrivastava, V. M. Patel, J. K. Pillai, and R. Chellappa, "Generalized dictionaries for multiple instance learning," International Journal of Computer Vision: Special Issue on Sparse Coding, vol. 114, no. 2, pp. 288-305, Sept. 2015. (pdf)

A. Shrivastava, J. K. Pillai, and V. M. Patel, "Multiple kernel-based dictionary learning for weakly supervised classification," Pattern Recognition, vol. 48, no. 8, pp. 2667-2675, Aug. 2015. (pdf)


Analysis sparse coding models:

S. Shekhar, V. M. Patel, and R. Chellappa, "Analysis sparse coding models for image-based classification," IEEE International Conference on Image Processing (ICIP), Paris, France, 2014. (pdf)


Dictionary learning from ambiguously labeled data:

Y-C. Chen, V. M. Patel, J. K. Pillai, R. Chellappa, and P. J. Phillips, "Ambiguously labeled learning using dictionaries," IEEE Transactions on Information Forensics and Security: Special Issue on Facial Biometrics in the Wild, vol. 9, no. 12, pp. 2076-2088, Dec. 2014.  (pdf)

Y-C. Chen, V. M. Patel, J. K. Pillai, R. Chellappa and P. J. Phillips, "Dictionary learning from ambiguously labeled data," IEEE conference on Computer Vision and Pattern Recognition (CVPR), Portland, Oregon, 2013. (pdf)


Sparse and low-rank subspace clustering:

V. M. Patel, H. V. Nguyen and R. Vidal, IEEE Journal of Selected Topics in Signal Processing: Special Issue on Signal Processing for Big Data, vol. 9, no. 4, pp. 691-701, June 2015. (pdf)

V. M. Patel, H. V. Nguyen and R. Vidal, "Latent space sparse subspace clustering," International Conference on Computer Vision (ICCV), Sydney, Australia, 2013. (pdf)




Active authentication:


V. M. Patel, T. Yeh, M. E. Fathy, Y. Zhang, Y. Chen, R. Chellappa, and L. Davis, "Screen fingerprints: a novel modality for active authentication," IEEE IT Professional Magazine: Special Issue on Security, vol. 15, no. 4, pp. 38-42, July 2013. (pdf

M. E. Fathy, V. M. Patel, T. Yeh, Y. Zhang, R. Chellappa, and L. Davis, "Screen-based active user authentication," Pattern Recognition Letters, vol. 42, pp. 122-127, June 2014. (pdf)




Joint face and expression recognition:

S. Taheri, V. M. Patel, and R. Chellappa, "Component-based recognition of faces and facial expressions," IEEE Transactions on Affective Computing, vol. 4, no. 4, pp. 360-371, Oct. 2013. (pdf)





Dictionary learning with partially labeled data:

A. Shrivastava, V. M. Patel, and R. Chellappa, "Non-linear dictionary learning with partially labeled data," Pattern Recognition, vol. 48, no. 11, pp. 283-3292, Nov. 2015.. (pdf)

A. Shrivastava, J. K. Pillai, V. M. Patel, R. Chellappa, "Learning discriminative dictionaries with partially labeled data," IEEE International Conference on Image Processing (ICIP), Orlando, FL, 2012. (pdf)




Sparsity-based robust multimodal biometrics fusion:

S. Shekhar, V. M. Patel, N. M. Nasrabadi and R. Chellappa, "Joint sparsity-based robust multimodal biometrics recognition," European Conference on Computer Vision (ECCV) Workshop on Information Fusion in Computer Vision for Concept Recognition (IFCVCR), Florence, Italy, 2012. (pdf)

S. Shekhar, V. M. Patel, N. M. Nasrabadi and R. Chellappa, "Joint sparse representation for robust multimodal biometrics recognition," IEEE Transactions on Pattern Analysis and Machine Intelligence, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 36, no. 1, pp. 113-126, Jan. 2014. (pdf)







Dictionary-based face recognition from video:

Y-C. Chen, V. M. Patel, S. Shekhar, R. Chellappa and P. J. Phillips, "Video-based face recognition via joint sparse representation," IEEE International Conference on Automatic Face and Gesture Recognition (FG), Shanghai, China, 2013. (pdf)

Y-C. Chen, V. M. Patel, P. J. Phillips and R. Chellappa, "Dictionary-based face and person recognition from unconstrained video,"  IEEE Access: Special Issue on 4D’s of Machine Learn- ing for Biometrics: Deep Learning, Dictionary Learning, Domain Adaptation, and Distance Metric Learning, vol. 3, pp. 1783 - 1798, Oct. 2015. (pdf)

Y-C. Chen, V. M. Patel, P. J. Phillips and R. Chellappa, "Dictionary-based face recognition from video," European Conference on Computer Vision (ECCV), Florence, Italy, 2012. (pdf)

V. M. Patel, Y-C Chen, R. Chellappa, and P. J. Phillips, "Dictionaries for image and video-based face recognition,"  Journal of the Optical Society of America A, vol. 31, no. 5, pp. 1090-1103, May 2014. (pdf)







Non-linear kernel dictionary learning:

H. V. Nguyen, V. M. Patel, N. M. Nasrabadi, and R. Chellappa, "Kernel dictionary learning," IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Kyoto, Japan, 2012. (pdf)

H. V. Nguyen, V. M. Patel, N. M. Nasrabadi, and R. Chellappa, "Sparse embedding: a framework for sparsity promoting dimensionality reduction," European Conference on Computer Vision (ECCV), Florence, Italy, 2012. (pdf)

A. Shrivastava, H. V. Nguyen, V. M. Patel, and R. Chellappa, "Design of non-linear discriminative dictionaries for image classification," Asian Conference on Computer Vision (ACCV), Daejeon, Korea, 2012. (pdf)

H. V. Nguyen, V. M. Patel, N. M. Nasrabadi, and R. Chellappa, "Design of non-linear kernel dictionaries for object recognition," IEEE Transactions on Image Processing, vol. 22, no. 12, pp. 5123-5135, Dec. 2013. (pdf)






Domain adaptive dictionary learning:

S. Shekhar, V. M. Patel, H. V. Nguyen and R. Chellappa, "Generalized domain adaptive dictionaries," IEEE conference on Computer Vision and Pattern Recognition (CVPR), Portland, Oregon, 2013. (pdf)

Q. Qiu, V. M. Patel, P. Turaga, R. Chellappa, "Domain adaptive dictionary learning," European Conference on Computer Vision (ECCV), Florence, Italy, 2012. (pdf)




Millimeter wave (mmW) imaging:

V. M. Patel and J. N. Mait, "Compressive passive millimeter-wave imaging with extended depth of field," Optical Engineering: Special Issue on Terahertz and Millimeter Wave Imagingvol. 51, no. 9, Sept. 2012. (pdf)

V. M. Patel and J. N. Mait, "Passive millimeter-wave imaging with extended depth of  field and sparse data," IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Kyoto, Japan, 2012. (pdf)

                         





Compressive Synthetic Aperture Radar (SAR) imaging:

V. M. Patel, G. R. Easley, D. M. Healy, Jr. and R. Chellappa, "Compressed synthetic aperture radar," IEEE Journal of Selected Topics in Signal Processing: Special Issue on Compressive Sensing, vol. 4, no. 2, pp. 244-254, April 2010. (pdf)

V. M. Patel, G. R. Easley, D. M. Healy, Jr., and R. Chellappa, "Compressed sensing for synthetic aperture radar imaging," IEEE International Conference on Image Processing (ICIP), Cairo, Egypt, 2009. (pdf)

V. M. Patel, G. R. Easley, and R. Chellappa, "Multilayered Image representation-based compressive SAR imaging," IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, Spokane , WA, 2011. (Invited)




Recognition of humans from iris images and videos:

J. K. Pillai, V. M. Patel, R. Chellappa and N. K. Ratha, "Random projections and sparse representations for secure and robust iris recognition," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 33, no. 9, pp. 1877-1893, Sept. 2011. (pdf)

J. Pillai, V. M. Patel and R. Chellappa, "Sparsity inspired selection and recognition of iris images," IEEE International Conference on Biometrics: Theory, Applications and Systems (BTAS), Washington, DC, 2009. (pdf)

J. Pillai, V. M. Patel, R. Chellappa and N. K. Ratha, "Sectored random projections for cancelable iris biometrics," IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Dallas, TX, 2010. (pdf)








Remote identification of faces:

V. M. Patel, T. Wu, S. Biswas, P. J. Phillips, and R. Chellappa, "Dictionary-based face recognition under variable lighting and pose," IEEE Transactions on Information Forensics and Security, vol. 7, no. 3, pp. 954-965, June 2012. (pdf)

R. Chellappa, J. Ni, and V. M. Patel, "Remote identification of faces: problems, prospects, and progress," Pattern Recognition Letters: Special Issue on Novel Pattern Recognition-based Methods for Reidentification in Biometric Context, vol. 33, no. 15, pp. 1849-1859, Oct. 2012. (Invited) (link)

Image recovery methods from partial Fourier measurements:

V. M. Patel, R. Maleh, A. C. Gilbert, and R. Chellappa, "Gradient-based image recovery methods from incomplete Fourier measurements," IEEE Transactions on Image Processing, vol. 21, no. 1, pp. 94-105, Jan. 2012. (pdf)

V. M. Patel, G. R. Easley, R. Chellappa and D. M. Healy, Jr., "Enhancing sparsity using gradients for compressive sensing," IEEE International Conference on Image Processing (ICIP), Cairo, Egypt, 2009. (pdf)






Geometric and manifold approaches for blur compensation:

J. Ni, P. Turaga, V. M. Patel and, R. Chellappa, "Example-driven manifold priors for image deconvolution," IEEE Transactions on Image Processing, vol. 20, no. 11,  pp. 3086-3096, Nov. 2011. (pdf)

J. Ni, P. Turaga, V. M. Patel, and R. Chellappa, "Object dependent manifold priors for image deconvolution," Digital Image Processing and Analysis (DIPA), Tucson, AZ, 2010. (pdf)






Wavelets with composite dilations:

G. R. Easley, D. Labate, and V. M. Patel, "Directional multiscale processing of images using wavelets with composite dilations," Journal of Mathematical Imaging and Vision, vol. 48, no. 1, pp. 13-34, Jan. 2014. (pdf)

G. R. Easley, D. Labate and V. M. Patel, "Hyperbolic shearlets," IEEE International Conference on Image Processing (ICIP), Orlando, FL, 2012. (pdf)

V. M. Patel, G. R. Easley and D. M. Healy, Jr., "Shearlet-based deconvolution," IEEE Transactions on Image Processing, vol. 18, no. 12, pp. 2673-2685, Dec. 2009. (pdf)

V. M. Patel, G. R. Easley, and D. M. Healy, Jr., "A new multiresolution generalized directional filter bank design and application in image enhancement," IEEE International Conference on Image Processing (ICIP), San Diego, CA, 2008. (pdf)