The Vice President and founding life member of the Indian Unit for Pattern Recognition & Artificial Intelligence (IUPRAI), the Indian associate (organization) of the International Association of Pattern Recognition (IAPR).

A member of the Scientific Board for the International Consortium for Interdisciplinary Science(ICIS) .

A Member of the first editorial board as Corresponding editor of the journal Resonance: a journal on science education published by the Indian Academy of Sciences (IASc), Bangalore.

The Technical Program Committee Co-Chair of the 1st Indo-Japan Conference on Perception and Machine Intelligence (PerMIn'12) to be held Kolkata, India, January 12- 13, 2012.

The Technical Program Committee Co-Chair of the 4th International Conference on Pattern Recognition and Machine Intelligence (PReMI'11) was held at the Higher School of Economics(HSE), Moscow, Russia, June 26- 30, 2011.

A Member of the technical program Committee for 2nd International conference on Emerging Applications and Information Technology(EAIT 2011), organised by CSI, Kolkata, India, February 2011, 9th International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR 2011), Guilin, Guangxi, China,July 2011, 9th International Workshop on Fuzzy Logic and Applications (WILF 2011), Bari, Italy, August 2011 and 4th International Conference on Imaging for Crime Detection and Prevention (ICDP2011), London, U.K, November 2011.

A Member of the Steering Committee for 7th International Workshop for Data Analysis in Astronomy on Science: Image in Action(DAA 2011), Erice, Italy, July 2011.

A Member of the technical program Committee for the for the 8th International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR 2010), Qingdao, Shangdong China,July 2010 and 7th Indian Conference on Computer Vision, Graphics and Image Processing (ICVGIP'10) held at IIT Madras,Chennai, India, December, 2010.

A Member of the technical program Committee for the for the 7th International Conference on Advances in Pattern Recognition(ICAPR 2009), ISI, Kolkata, India,February 2009, 8th International Workshop on Fuzzy Logic and Applications (WILF 2009), Palermo, Italy, June 2009, 7th International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR 2009), Baoding, Hebei, China,July 2009, 3rd International Conference on Pattern Recognition & Machine Intelligence (PReMI 2009), New Delhi, India, December 2009 and  3rd International Conference on Imaging for Crime Detection and Prevention (ICDP2009), London, U.K, December 2009 respectively.

A Member of the National Advisory Committee for the 2nd National Seminar on Recent Advances on Information Technology (RAIT2009), ISMU, Dhanbad, India,February 2009, & IEEE International Conference on Advance Computing (ICAC2009), TU, Patiala,India, March 2009 and 3nd International Conference on Computer and Devices (CODEC-2009), Organized by the Department of Radio Physics & Electronics, University of Calcutta, Kolkata, India, December, 2009 respectively.

A Member of the technical program Committee for the 6th International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR 2008), Hong Kong, China, August 2008.

A Member of the National Advisory Committee for the 1st National Conference on Computer Vision, Pattern Recognition, Image Processing and Graphics (NCVPRIPG-08) ; Second National Conference on Mathematical Techniques: Emerging Paradigms for Electronics and IT Industries (MATEIT-2008) & 1st Indian Conference on Trends of Modern Engineering Systems (IConTiMES-08) Analysis and Pattern Recognition, Gandhinagar, New Delhi and Kalyani, India respectively in 2008.

A Member of the technical program Committee for the 15th International Conference on Advanced Computing and Communication(ADCOM 2007), IIT, Guwahati, India, December 2007 & for the 6th International Conference on Advances in Pattern Recognition(ICAPR 2007), ISI, Kolkata, India, January 2007 respectively.

The General Chair of the International Conference on Computing : Theory and Application (ICCTA 2007) held at the Indian Statistical Institute, Calcutta, India, as part of the Platinum Jubilee Celebration of the Institute, March, 2007.

The General Chair of the 2nd International Conference on Information Systems Security (ICISS 2006) held at the Indian Statistical Institute, Calcutta, India, December, 2006.

A Member of the  technical program Committee for the IEE International Conference Visual Information Engineering (VIE 2006) held at Hotel Leela Palace, Bangalore,India, September, 2006 & for the 5th Indian Conference on Computer Vision, Graphics and Image Processing (ICVGIP'06) held at Madurai, India, December, 2006 respectively.

A Member of the National Advisory Committee for the 2nd International Conference on Computer and Devices (CODEC-2006), Organized by the Department of Radio Physics & Electronics, University of Calcutta, Kolkata, India. Januany, 2006.

The Organizing Chair & Member of the technical program Committee for the 4th Indian Conference on Computer Vision, Graphics and Image Processing (ICVGIP'04) held at  Calcutta, India, during December, 2004.

The Chairman of the Local Organizing Committee and the Member of the Scientific Committee  for the CIMPA-UNESCO-INDIA International School on Soft Computing Approach to Pattern recognition and Image Processing held at Calcutta, during December, 2002.

A member of the technical program committee for the 13th International Conference on VLSI Design (VLSI 2000) held at Calcutta,January, 2000.

A member of the Ph.D committee in Radio Physics and Electronics, Calcutta University, Kolkata.

A member of the Academic Council of the Indian School of Mines University, Dhanbad.

A member of the Senate of the National Institute of Technology, Durgapur (Deemed University), Durgapur, West Bengal (till 2007).

A member (external) of the Board of Course Studies(BOCS) for the department of Computer Science & Engineering & the department of Applied  Mathematics at the Indian School of Mines University, Dhanbad.

A guest faculty and a member of the board of examination of the Department of Computer Science,Calcutta University from 1992 to 1995.

A member of the panel of examiners for Ph.D.degree at the department of Applied Physics, Calcutta University from 1995 to 2002.

Delivered  Invited lecture on Content based Image retrieval: An Important Tool for the Development of Efficient Visual Information Seaqrch Engine in the special guest lecture series organized by the Society of Applied Mathematics, Indian School of Mines University, Dhanbad, Jharkhand, India, April, 2011.

Delivered an invited tutorial lectures on Introduction to Digital image processing: An approach for visual information extraction & manipulation at the DST Sponsored Winter School on DSP Algorithms, Architecture & Applications organized by the Institute of Radio Physics and Electronics, University of Calcutta, Kolkata, India, January, 2010.

Delivered Keynote lecture on Relevance and application of soft computing paradigm in digital image processing  at the National seminar on Soft Computing Applications in Engineering (NSSCAE-2010) organized by the Trident Academy of technology, Bhubneswar, India, January, 2010.

Delivered an invited lecture on Digital image enhancement, compression and human visual response: are there any relations? at the 9th International Photographic Conference in the session on Digital imaging technology organized by the Photographic Association of Dum Dum, Kolkata, India, January, 2010.

Delivered an invited lecture on Image Processing & analysis using Fuzzy Sets and Genetic Algorithms at the DST Sponsored Workshop on Soft Computing organized by the Center for Soft Computing Research: A National Facility at the Indian Statistical Institute, Kolkata, India, July, 2009.

Delivered an invited tutorial lecture on  Image analysis using fuzzy sets genetic algorithms and their integration at the 8th International Workshop of Fuzzy Logic and Applications 2009 (WILF 2009) organized by the Universita` degli Studi di Palermo, Terrasini, Italy, June, 2009.

Delivered an invited lecture on Image processing and analysis using Soft computing paradigm at the IEEE International Workshop on Recent Trends In Image and Video Processing organized by the West Bengal University of Technology(WBUT), Kolkata, India, December, 2008.

Delivered an invited lecture on Content Based Image Retrieval: Mining of information from unstructured data at the DST Sponsored Workshop on Data Mining and Data Warehousing organized by the Center for Soft Computing Research: A National Facility at the Indian Statistical Institute, Kolkata, India, September, 2008.

Delivered an invited lecture on Soft computing methodologies: Applications in image processing and analysis at the First Indian Conference on Trends in Modern Engineering Systems organized by the JIS College of Engineering, Kalyani, India, February, 2008.

Delivered an invited lectures on Visual Information Extraction & Manipulation Using Digital Image Processing Techniques and Soft Computing Paradigm: Relevance & Applications in image analysis at the National workshop on Digital Image Processing and its application organized by the National Institute of Technology Durgapur, Durgapur,India, December, 2007.

Delivered an invited lecture on Wavelets: A powerful tool for Image analysis  in the Colloquium on Modern trends of Image processing, Pattern Recognition and Image Processing Architectures organized by the Bengal Engineering & Science University at Shibpur, Howrah, India, November, 2007. 

Delivered  an invited lecture on  Soft Computing Based approach for Real Life Image Analysis  at the TCS Innovation Lab, TCS tower, Gurgaon,Delhi in the workshop on Multimedia Applications for Enterprises organized by  the TCS Innovation Lab, Delhi, India, May, 2007.

Delivered an invited lecture on Wavelets: Fundamentals and its applications  at the Spring School on Soft Computing : Advances and Applications organized by the Center for Soft Computing Research: A National Facility at the Indian Statistical Institute, Kolkata, India, March, 2007.

Delivered  Keynote address on  Image Processing in Soft Computing Paradigm at the National conference on  Recent Advances in Information Technology (RAIT-2007) organized by  the Indian School of Mines University, Dhanbad, Jharkhand, India, February, 2007.

Delivered  lecture as an invited panelist in the Special Session on Industry-Academia Collaboration for Innovation in the INFOCOM-2006 Conference organized jointly by the NASSCOM & ABP group at the Hotel ITC Sonar Bangla, Kolkata, India, December, 2006.

Delivered  invited lectures on Image Processing & Analysis: Fundamentals and Application at the TEQIP sponsored workshop on Pattern Recognition & Image Processing organized by the Asansol Engineering College, Asansol, West Bengal, India, June, 2006.

Delivered  Keynote   address on Relevance of Soft Computing Methodologies in image analysis at the National conference on  Soft Computing Techniques for the Engineering Applications (SCT-2006) organized by the National Institute of Technology, Rourkela, Orissa, India, March, 2006.

Delivered  invited lectures on Biometric Image Analysis at the Winter School on Pattern Recognition for the Forensic Sciences organized by  the Applied Statistics Unit of the Indian Statistical Institute, Kolkata, India, January, 2006.

Delivered invited lectures on Wavelets: Fundamentals & Applications at the Winter School on Soft Computing Tools, Simulation & Applications organized by  the Center for Soft Computing Research: A National Facility at the Indian Statistical Institute, Kolkata, India, January, 2006.

Delivered an invited lecture on Computational Intelligence & Multiresolution signal processing tool for image analysis at the National workshop on Computational Intelligence and its application organized by the National Institute of Technology Durgapur, Durgapur, India, May, 2005.

Delivered  lecture as an invited panelist in the Special Session on Industry-Academia Interface in the INFOCOM-2005 Conference organized jointly by the NASSCOM & ABP group at the Hotel Hyatt Regency, Kolkata, India, December, 2005.

Delivered an invited lecture on Wavelets: Applications in analysis of real life images with texture  in the International conference on Number theory and Fourier techniques organized by  the  Srinivas Ramanujan Centre, SASTRA (Deemed )University , Kumbakonam, India, December, 2004.

Delivered an invited lecture on Digital Watermarking and Steganography in the Seminar titled Brainstorming Session on Steganography organized by  the CDAC, Kolkata, India, October, 2004.

Delivered an invited lecture on Collaborative Research & Education: A personal view in the Special Seminar on Industry-Academia Partnership for Global Challenges organized by  the Confederation of Indian Industries (CII), as a part of the CII-AICTE Technical Education Meet at the ITC Sonar Bangla Hotel, Kolkata, September, 2004.

Delivered an invited lecture on Wavelets and its Application in Image Analysis in  the Special Seminar  on Methods for Image Understanding organized by GE Research Lab, India at the GE John F. Welch Technology Center, Bangalore, India, July, 2004.

Delivered two invited lectures on Wavelets in Signal Processing: Fundamentals & Application of wavelets in Image Analysis in the National Workshop on Wavelet Analysis and Application organized jointly by the Institute of Mathematics and Application & the Institute of Physics, Bhubneswar at the Institute of Physics, Bhubneswar, India, February, 2004.

Delivered an  invited lecture on Wavelets: Application to Texture Based Image Analysis, in the Special Seminar organized on the occasion of the celebration of the Silver Jubilee year of the IEEE Calcutta Section at the Hotel Hyatt Regency, Kolkata, India, November, 2003.

Delivered an  invited lecture on Digital Information Security and Data Hiding, in  the  Special Seminar organized on the occasion of opening a new ACM Student Chapter at the Indian School of Mines(ISM), Dhanbad, India, March, 2003.

Delivered an  invited lecture on Information hiding, Steganography and Digital Watermarking  in the Conference  on  Horizons of Telecommunication (HOT 2003) organized by  the  Institute of Radio  Physics & Electronics, University of Calcutta, Kolkata, India, February, 2003.

Delivered an invited lecture on Digital Image Processing: An Introduction with Examples at the CIMPA-UNESCO-INDIA International School on Soft Computing Approach to Pattern recognition and Image Processing held at  Kolkata, India, December, 2002.  

Delivered an invited lecture on Digital Imaging Processing, Storage and secured access:  in the seminer on Information Technology organised by the Bengal Engineering & Science University at Shibpur, Howrah, India, January, 2002.        

  Delivered an  invited lecture on Pattern Recognition & Image Processing in the Symposium on  Space Science and Technology organized by the    Indian Physics Association(Calcutta chapter) & Physics Department of the  Presidendency College, Kolkata, India, May, 2000.   

Delivered an invited lecture on Digital Image Processing : Present Status and Future Challenges in the National Seminar on Information Technology : Opportunities & Challenges in the Millennium organized by the Institution of Engineers(India), Computer Engineering Division,West Bengal State Center, Kolkata, India, March, 2000.      

Delivered an invited lecture on Soft Computing and Digital Image Processing in the workshop on Frontiers of Electronics organized by the Institute of Radio Physics and Electronics, University of Calcutta, India, March 1999.

Delivered a series of invited lectures on Genetic Algorithms and Digital  Image Processing in the workshop on Neuro-computing, Pattern Recognition and Computer Vision organized jointly by E.R.D.C and I.S.I, Kolkata at E.R.D.C, Kolkata, India,December,1993.

Delivered a series of invited lectures on Digital image processing in the colloquium on Introduction to Pattern recognition and Image processing organized by The Indian Association for the Cultivation of Sciences(IACS), Jadavpur, Kolkata, India, October, 1992.

  Delivered a tutorial lecture series on the selected topics of Computer Vision ( Shape from -shading, motion & texture, photometric stereo, etc.) in a  workshop on  Image processing and Computer Vision organized by K.B.C.S nodal center, I.S.I, Kolkata, India, August 1990.

Delivered a series of tutorial lectures on Image Analysis Using Soft Computing Tools Like Fuzzy Sets & Genetic Algorithms and Wavelets: Fundamentals & Applications image at the ISI- TU Assam University Winter School on Soft Computing , organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata  &  Department of Computer Science & Engineering, Tezpur University,at Napaam, Tezpur, Assam, India  between December 20-23, 2010.

Delivered a series of tutorial lectures on Digital image watermarking and content based image retrieval at the ISI- SMIT Winter School on Image Processing and Machine Vision, organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata  &  Department of Information technology, Sikim Manipal Institute of Technology,at Majitar, Rangpo, Sikim, India  between March 9-14, 2009.

Delivered a series of tutorial lectures on Digital image watermarking, Fingerprint image analysis and advanced techniques of content based image retrieval at the ISI- AU Winter School on Image Processing and Analysis: Recent Advances, organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata  &  Department of Mathematics, Assam University, at Sichar, Assam, India  between January 18-22, 2007.

Delivered tutorial lectures on Content based image retrieval: an introduction with applications at the ISI- TU Winter School on Pattern Recognition and Machine Intelligence: Recent Advances, organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata  &  Computer Center, Tripura University, at Agartala, Tripura, India  between January 17-21, 2006.

Delivered tutorial lectures on Wavelet for image analysis, mining & bioinformatics at the ISI-NERIST Winter School on  Soft Computing, Data Mining and Bio Informatics organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata  &  North Eastern Regional Institute of Technology, at Nirjuli, Arunachal Pradesh, India  between February 14-18, 2005.

Delivered tutorial lectures on Content Based Image Retrieval & Image Information Mining at the ISI-NEHU Autumn School on  Pattern Recognition and Data Mining With Application to Web and Biological data  organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata &  North Eastern Hill University, at Umshing, Shillong, India  between September 23-27, 2003. 

Delivered tutorial lectures on Basics of Digital Image Processing at the ISI-MU Winter School on  Soft Computing, Pattern Recognition, Image Processing and Data Mining  organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata  &  Mizoram University, at Aizawl, India  between November 20-24, 2001.

Delivered tutorial lectures on Image Processing with conventional and Soft Computing Tools  at the ISI-GU Spring School on  Soft Computing Image Processing and Data Mining  organized by  the  Machine Intelligence Unit of the  Indian  Statistical Institute, Kolkata  &  Gauhati University, at Guwahati  between March 12-16, 2001 .