I am working as an Assistant Professor at the Department of Computer Science & Engineering at the Indian Institute of Technology (Banaras Hindu University), Varanasi.  Prior to this, I did my post-doctoral studies for one year at the School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore, and for six months at the Electronics and Communication Sciences Unit, Indian Statistical Institute, Kolkata, India. I completed my PhD from Indian Institute of Technology, Kharagpur, India in 2015. The broad area of my PhD research was Image and Video Processing.

I received Master degree (MCSE) in Computer Science & Engineering from Jadavpur University, Kolkata, India in 2011, and B Tech degree in Computer Science & Engineering from West Bengal University of Technology, India in 2009. My present research interests include application of machine learning, image processing and pattern recognition.  My hobbies are painting, and playing musical instruments. Please click here for further details.

Presently I am focusing on the following research topics:
1. Gait Recognition 
2. Person Re-identification and Recognition
3. Image and Video De-fencing
4. Face De-identification
5. Insider Threat Detection
6. Style Transfer and Image to Image Translation using Deep Learning
7. Content-based Image Retrieval

Publications:

Journals

Utkarsh Tripathi, Akshat Agrawal, Josephine Crystal R Mathew, Rajesh Pandey, and Pratik Chattopadhyay, An Efficient Approach for Image De-fencing Based on Conditional Generative Adversarial Network,  Springer Signal, Image and Video Processing (accepted in 2022).

Nirbhay Kumar Tagore and Pratik Chattopadhyay, A Bi-Network Architecture for Occlusion Handling in Person Re-Identification, Springer Signal, Image and Video Processing (accepted in 2021).

Sanjay Kumar Gupta and Pratik Chattopadhyay, Gait Recognition in the Presence of Co-variate Conditions, Elsevier Neurocomputing, 454: 76-87, 2021.

Nirbhay Kumar Tagore, Ayushman Singh, Manche Sumanth, Pratik Chattopadhyay, Person Re-identification from Appearance Cues and Deep Siamese Features, Journal of Visual Communication and Image Representation, 75, Article No. 103029, 2021.

Ayush Agarwal, Pratik Chattopadhyay, Lipo Wang, Privacy Preservation through Facial De-identification with Simultaneous Emotion Preservation, Signal, Image and Video Processing (accepted in 2020). DOI: https://doi.org/10.1007/s11760-020-01819-9

Sanjay Kumar Gupta and Pratik Chattopadhyay, Exploiting Pose Dynamics for Human Recognition from their Gait Signatures, Multimedia Tools and Applications (accepted in 2020). DOI: https://doi.org/10.1007/s11042-020-10071-9

Nirbhay Kumar, Pratik Chattopadhyay, Lipo Wang, T-MAN: A Neural Ensemble Approach for Person Re-Identification using Spatio-temporal Information, Multimedia Tools and Applications, 79(37), 28393–28409, 2020.

Divyanshu Gupta, Shorya Jain, Utkarsh Tripathi, Pratik Chattopadhyay, and Lipo Wang, A Robust and Efficient Image De-fencing Approach using Conditional Generative Adversarial Networks, Signal, Image and Video Processing, 15(2), 297-305, 2021.

Pratik Chattopadhyay, Lipo Wang, Yap-Peng Tan, Scenario-Based Insider Threat Detection From Cyber Activities, IEEE Transactions on Computational Social Systems, 5(3), 1-16, 2018. 

Aditi Roy, Pratik Chattopadhyay, Shamik Sural, Jayanta Mukherjee and Gerhard Rigoll, Modeling, Synthesis and Characterization of Occlusion in Videos, IET Computer Vision, 9(6): 821-830, 2015.

Pratik Chattopadhyay, Shamik Sural, and Jayanta Mukherjee, Information Fusion from Multiple Cameras for Gait-based Re-identification and Recognition, IET Image Processing, 9(11): 969-976, 2015.

Pratik Chattopadhyay, Shamik Sural, and Jayanta Mukherjee, Frontal Gait Recognition from Occluded Scenes, Elsevier Pattern Recognition Letters, 63(1): 9-15, 2015. 

Pratik Chattopadhyay, Shamik Sural, and Jayanta Mukherjee, Frontal Gait Recognition from Incomplete Sequences using RGB-D Camera, IEEE Transactions on Information Forensics and Security, 9(11): 1843-1856, 2014.

Pratik Chattopadhyay, Aditi Roy, Shamik Sural, and Jayanta Mukhopadhyay, Pose Depth Volume Extraction from RGB-D Streams for Frontal Gait Recognition, Elsevier Journal of Visual Communication and Image Representation, 25(1): 53–63, 2014.

Conferences/Workshops

Dhritimaan Das, Ayush Agarwal, and Pratik Chattopadhyay, Gait Recognition from Occluded Sequences in Surveillance Sites, Real-World Surveillance: Applications and Challenges, Workshop in Conjunction with European Conference on Computer Vision (accepted in 2022).

Ankit Sinha, Soham Banerjee, and Pratik Chattopadhyay, Effective Stacking of Deep Neural Models for Automated Object Recognition in Retail Stores, International Conference on Image Analysis and Processing (accepted in 2022).

Alakh Aggarwal, Rishika Rathore, Pratik Chattopadhyay, and Lipo Wang, EPD-Net: A GAN-based Architecture for Face De-identification from Images, IEEE International Conference on IOT, Electronics and Mechatronics Conference (IEMTRONICS), 1-7, 2020.

Nirbhay Tagore and Pratik Chattopadhyay. SMSNet: A Novel Multi-Scale Siamese Model for Person Re-Identification, 17th International Conference on Signal Processing and Multimedia Applications. (accepted in 2020).

Krishnan, Utsav, Ayush Agarwal, Avinash Senthil, and Pratik Chattopadhyay. Image Enhancement and Denoising in Extreme Low-Light Conditions. (accepted in 2019).

Shailesh Shrivastava, Alakh Aggarwal, Pratik Chattopadhyay, Broad Neural Network for Change Detection in Aerial Images, 1st International Conference on Emerging Technology in Modelling and Graphics, Springer Singapore, 327-339, 2019.

Sanjay Kumar Gupta, Gaurav Mahesh Sultaniya, Pratik Chattopadhyay, An Efficient Descriptor for Gait Recognition using Spatio-Temporal Cues, International Conference on Emerging Technology in Modelling and Graphics, Springer Singapore, 85-97, 2019.

Utsav Krishnan, Akshal Sharma, Pratik Chattopadhyay, Feature Fusion from Multiple Paintings for Generalized Artistic Style Transfer, International Conference on Advances in Engineering Science Management & Technology, SSRN 3387817, 2019. 

David Lorenzi, Pratik Chattopadhyay, Emre Uzun, Jaideep Vaidya, Shamik Sural, Vijayalakshmi Atluri, Generating Secure Images for CAPTCHAs through Noise Addition, ACM Symposium on Access Control Models and Technologies, 169-172, 2015. (demo paper)

Pratik Chattopadhyay, Shamik Sural and Jayanta Mukherjee, Exploiting Pose Information for Gait Recognition from Depth Streams, 4th IEEE Workshop on Consumer Depth Cameras for Computer Vision in conjunction with European Conference on Computer Vision, Lecture Notes in Computer Science, Springer International Publishing, 341-355, 2014.

Pratik Chattopadhyay, Shamik Sural, and Jayanta Mukherjee, Gait Recognition from Front and Back View Sequences captured using Kinect, 5th International Conference on Pattern Recognition and Machine Intelligence, Lecture Notes in Computer Science, Springer Berlin Heidelberg, 196–203, 2013.

Patent
Surveillance using Partial Gait Sequences, Pratik Chattopadhyay, Shamik Sural, Jayanta Mukhopadhyay. Status: Filed (Ref: 615/KOL/2014)

Books
Co-authored a book on Video Analytics- A Machine Intelligence Approach to Springer, Singapore. Other authors are Dr. Debi Prosad Dogra (IIT Bhubaneswar) and Dr. Shamik Sural (IIT Kharagpur). The first draft is submitted in January 2019 and is presently under review.