Research Interests

My research interests are in multimedia security, digital watermarking, steganalysis, image forensics, satellite remote sensing, image processing and UWB radar target detection and identification. I coordinate the research activities of the Watermarking and Multimedia Security Group (WMSG)  in the Department. Please refer to the group website on the individual research topics. I was the recipient of the IET Innovation in Engineering Award on Security for my research on digital watermarking in 2006.

The Department and WMSG will be hosting the International Workshop on Digital Watermarking (IWDW09), 24-26 August 2009, University of Surrey. For more information about IWDW09 and on Call for Papers, please refer to this link: www.iwdw.org.uk

Research Activities

Publications

Books/Chapters

• Ho, A.T.S., Rao, S., Cheng, L.M., Editors, SPIE Proceedings on Automatic Inspection and Novel Instrumentation (Vol 3185) ISBN: 0-8194-2612-1, 178 pages Published 1997
• Liao, B.Y., Pan, J.S., Jain, L.C., Noda, H.,  Ho, A.T.S., Editors, IEEE Proceedings on Intelligent Information Hiding and Multimedia Signal Processing, IEEE Computer Society, Vol. I and Vol. II, 2007, ISBN 0-7695-2994-1, 1329 pages
• Kim, H.J., Katzenbeisser, S., Ho, A.T.S., Editors, Springer Varlag, Pre-Proceedings of IWDW08, November 2008, 453 pages
• Izquierdo, E., Ho, A.T.S., Kim, H.J., Editors, "Special Issue on Video Retrieval," Journal of Multimedia, Academy Publisher, 2009
• Zhao, X., Ho, A.T.S., "Semi-fragile Watermarking, Authentication and Localisation Techniques for Law Enforcement Applications," Book Chapter accepted with minor revision, Handbook of Research on Computational Forensics, Digital Crime and Investigation: Methods and Solutions, 2009

Refereed Journal and Conference Papers (Submitted and Under Review)

• Duan, G., Ho, A.T.S., Zhao, X., "A Novel Non-Redundant Wavelet-Based Contourlet Transform for Image Content Authentication and Localization," Submitted to IEEE Transactions on Information Forensics and Security, August 2008
• Bateman, P., Ho, A.T.S., Woodward, A.., "Image Forensics of Digital Cameras by Analysing Image Variations Using Statistical Process Control," Submitted to IEEE International Workshop on Multimedia Signal Processing (MMSP'09), 5-7 October 2009, Rio de Janeiro, Brazil

Refereed Journal and Conference Papers (Accepted)

2009

• Puhan, N.B., Ho, A.T.S., Sattar, F., "High Capacity Data Hiding in Binary Document Images," Accepted with revisions, 8th International Workshop on Digital Watermarking (IWDW'09), 24-26 August 2009, Guildford, UK
• Zhao, X., Ho, A.T.S., Shi, Y.Q., "Image Forensics using Generalized Benford's Law for Accurate Detection of Unknown JPEG Compression in Watermarked Images," Accepted with minor revisions, 16th International Conference on Digital Signal Processing (DSP2009), 5-7 July 2009, Santorini, Greece 
• Wahab, A.W.A., Briffa, J., Schaathun, H.G., Ho, A.T.S., "Conditional Probability Based Steganalysis for JPEG Steganography," 2009 International Conference on Signal Processing Systems (ICSPS09), 15-17 May 2009, Singapore
• Wahab, A.W.A., Schaathun, H.G., Ho, A.T.S,, "Markov Process Based Steganalysis by Using Second-Step Transition Probability Matrix," 8th European Conference on Information Warfare and Security, 6-7 July 2009, Braga, Portugal
• Jiang, W., Ho, A.T.S., Treharne, H., "A Novel Least Distortion Linear Gain Model for Halftone Image Watermarking Incorporating Perceptual Quality Metrics,"  LNCS Transactions on Data Hiding and Multimedia Security, to appear in the 4th issue, 2009
• Puhan, N.B., Ho, A.T.S., Sattar, F., "Localization and Restoration Using Noise Pixels in Binary Document Image Watermarking," Accepted for publication in Journal of Electronic Imaging (JEI), 2009

2008

• Williams, D.M, Treharne, H., Ho, A.T.S., Waller, A., "Formal Analysis of Two Buyer-Seller Watermarking Protocols," 7th International Workshop on Digital Watermarking (IWDW08), Springer-Varleg, Pre-Proceedings, pp289-303, 10-12 November 2008, Busan, Korea 
• Williams, D.M, Treharne, H., Ho, A.T.S., Culnane, C., "Using a Formal Analysis Technique to Identify an Unbinding Attack on a Buyer-Seller Watermarking Protocol," Accepted for 10th ACM Workshop on Multimedia and Security, September 22-23, 2008, Oxford, UK
• Ho, A.T.S., Zhu, X., Shen, J., Marziliano, P. "Fragile Watermarking Based on Encoding of the Zeros of the z-Transform,"  IEEE Transactions on Information Forensics and Security (TIFS), Vol. 3, No. 5, 567-579, September 2008
• Duan, G., Ho, A.T.S., Zhao, X, " ANovel Non-Redundant Contourlet Transform for Robust Image Watermarking Against Non-Geometrical and Geometrical Attacks," Proceeding  IET 5th International Conference on Visual Information Engineering (VIE08), Xi'an, China, 29 July - 1 August 2008, p124-129, ISBN: 9780863419140
• Huang, W., Ho, A.T.S., Pankajakshan, V., "Watermarking-based Content Authentication of Motion-JPEG Sequences," Proceeding IET 5th International Conference on Visual Information Engineering (VIE08), Xi'an, China, 29 July - 1 August 2008, p813-818, ISBN: 9780863419140

2007

• Culnane, C., Treharne, H., Ho, A.T.S., "Authenticating Binary Text Documents Using a Localising OMAC Watermark Robust to Printing and Scanning," International Workshop for Digital Watermarking (IWDW07), Guangzhou, China, 3-5 December 2007
• Jiang, W., Ho, A.T.S., Treharne, H., "Least Distortion Halftone Image Data Hiding Watermarking by Optimizing an Iterative Linear Gain Model," LNCS Springer-Verlag, Vol 5041, pp 423-439, 2008, International Workshop for Digital Watermarking (IWDW07), Guangzhou, China, 3-5 December 2007
• Pankajakshan, V., Ho, A.T.S., "Improving Video Steganalysis using Temporal Correlation," IEEE 3rd International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP07), Kaohsiung, Taiwan, 26-28 November 2007
• Zhao, X., Ho, A.T.S., Treharne, H., Pankajakshan, V., Culnane, C., Jiang, W., "A Novel Semi-Fragile Image Watermarking, Authentication and Self-restoration Technique Using the Slant Transform," IEEE 3rd International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP07), Kaohsiung, Taiwan, 26-28 November 2007
• Zhang, J., Ho, A.T.S., Qiu, G., Marziliano, P., "Robust Video Watermarking of H.264/AVC," IEEE Transactions on Circuits and Systems (TCAS), Part II, Vol. 54, Issue 2, p205-209, February 2007
• Zhu, X., Ho, A.T.S., Marziliano, P., "A New Semi-fragile Image Watermarking With Robust Tampering Restoration Using Irregular Sampling,"  Elsevier Signal Processing: Image Communication, Vol. 22, Issue 5, p515-528, June 2007
• Ho, A.T.S., Zhu, X., Tang, L. "Digital Watermarking Authentication and Restoration for Chinese Calligraphy Images," Accepted for IEEE 15th International Conference on Digital Signal Processing, DSP2007, Cardiff, UK, July 2007
• Ho, A.T.S. "Semi-fragile Watermarking and Authentication for Law Enforcement Applications," IEEE International Conference on Innovative Computing, Information and Control (ICICIC-07), Kumamoto, Japan,  5 - 7 September 2007
• Niladri B, Puhan, Ho, A.T.S., Sattar, F., "Erasable Authentication Watermarking in Binary Document Images," IEEE International Conference on Innovative Computing, Information and Control (ICICIC-07), Kumamoto, Japan,  5 - 7 September 2007
• Culnane, C., Treharne, H., Ho, A.T.S., "Improving Multi-set Formatted Binary Text Watermarking Using Continuous Line Embedding," IEEE International Conference on Innovative Computing, Information and Control (ICICIC-07), Kumamoto, Japan,  5 - 7 September 2007
• Niladri B, Puhan, Ho, A.T.S., "Secure Authentication Watermarking for Localization Against the Holliman-Memon Attack," ACM Multimedia Systems, Vol. 12, No. 6, pp521-532, May 2007

2006

• Zhu, X., Ho, A.T.S., Marziliano, P., "Image Authentication and Restoration Using Irregular Sampling for Traffic Enforcement Applications," IEEE International Conference on Innovative Computing, Information and Control (ICICIC-06), Beijing, China, 30 August - 1 September 2006
• Zhang, J., Ho, A.T.S., "Efficient Video Authentication for H.264/AVC,", IEEE International Conference on Innovative Computing, Information and Control (ICICIC-06), Beijing, China, 30 August - 1 September 2006
• Ho, A.T.S., Zhu, X., Vrusias, B., Armstrong, J., "Digital Watermarking and Authentication for Crime Scene Analysis," IET International Conference on Crime and Security, p479-485, ISBN: 0-86341-647-0, 13-14 June 2006, London UK
• Niladri B, Puhan, Ho, A.T.S., "Secure Exact Authentication in Binary Document Image Watermarking," IET Visual Information Engineering (VIE2006), CP522, p29-34, ISBN: 0 86341 671 3, Bangalore, India, 26-28 September 2006
• Culnane, C., Treharne, H., Ho, A.T.S., "A New Multi-Set Modulation Technique for Increasing Hiding Capacity of Binary Watermark for Print and Scan Processes," Lecture Notes in Computer Science, Digital Watermarking, Vol. 4283/2006, p96-110, ISBN: 978-3-540-48825-5, 2006

2005

• Niladri B, Puhan, Ho A.T.S..,"Binary Document Image Watermarking for Secure Authentication Using Perceptual Modeling," 5th IEEE International Symposium on Signal Processing and Information Technology, Athens , Greece , 18-20 December 2005
• Niladri B, Puhan, Ho A.T.S.., "Restoration in Secure Text Document Image Authentication Using Erasable Watermarks," IEEE International Conference on Computational Intelligence and Security, December 15-19 Xi'an, China 2005, Springer-Verlag in Lecture Notes in AI as part of the LNCS/LNAI Series
• Niladri B, Puhan, Ho A.T.S.., "Public Key Authentication of Binary Document Images Using Perceptual Watermarking ," IEEE International Conference on Computational Intelligence and Security, December 15-19 Xi'an, China 2005
• Niladri B, Puhan, Ho, A.T.S., "Secure Tamper Localization in Binary Document Image Authentication," Multimedia Authentication and Watermarking Applications, Springer-Verlag in Lecture Notes in AI as part of the LNCS/LNAI Series, ISSN: 0302-9743, vol. 3684, p263-271, 2005
• Ho, A.T.S., Zhu, X., “Traffic Image Authentication Based on Pinned Sine Transform,” IEE International Symposium on Imaging for Crime Detection and Prevention (ICDP 2005), 7-8 June, 2005, London, UK
• Ho, A.T.S., Zhu, X., Woon, W.M., "A Semi-Fragile Pinned Sine Transform Watermarking System For Content Authentication of Satellite Images," IEEE International Geoscience and Remote Sensing Symposium (IGARSS) 2005, 25-29 July 2005, Seoul, South Korea
• Ho, A.T.S., Tham, W.H., Low, K.S., "Improving Classification Accuracy in Through-Wall Radar Imaging Using Hybrid Prony’s and Singular Value Decomposition Method," IEEE International Geoscience and Remote Sensing Symposium (IGARSS) 2005, 25-29 July 2005, Seoul, South Korea
• Ho, A.T.S., Tham, W.H., Low, K.S., "Through-Wall Radar Image Reconstruction Based on Time-Domain Transient Signals in the Presence of Noise," IEEE International Geoscience and Remote Sensing Symposium (IGARSS) 2005, 25-29 July 2005, Seoul, South Korea
• Zhang, J., Ho, A.T.S., "Efficient Robust Watermarking of Compressed 2-D Grayscale Patterns for H.264/AVC," IEEE International Workshop on Multimedia Signal Processing, Shanghai, China, October 2005
• Zhang, J., Ho, A.T.S., "Robust Digital Image-in-video Watermarking for the Emerging H.264/AVC Standard," IEEE 2005 Workshop on Signal Processing Systems (SIPS’05), Athens, Greece, November 2-4, 2005
• Zhang, J., Ho, A.T.S., "An Efficient Authentication Method for H.264/AVC," 2nd European Workshop on the Integration of Knowledge, Semantic and Digital Media Technologies (EWIMT 2005), IEE Savoy Place, London, November 30- December 1, 2005

2004

• Ho, A.T.S., Zhu, X., Guan, Y.L., “Image Content Authentication Using Pinned Sine Transform,” EURASIP Journal on Applied Signal processing (JASP), Special Issue on Multimedia Security and Rights Management, No. 14, Vol 2004, pp2174-2184, October 2004
• Yuan, X.C., Tao, S.H., Chen, Y.W., Lim, M.S., Cheong, W.C., Moh, K.J., Ho, A.T.S., "Hybrid Encryption and Decryption Technique using Microfabricated Diffractive Optical Elements," Optical Engineering Letters, Vol 43, 11, Nov 20o4
• Ho, A.T.S., Zhu, X., Guan, Y.L., Marziliano, P., “Slant Transform Watermarking for Textured Images,” Invited Session on Information Assurance and Data Hiding II, IEEE International Symposium on Circuits and Systems (ISCAS) 2004, Vancouver, Canada, 23-26 May, 2004
• Ho, A.T.S., Niladri B, Puhan, Marziliano, P., Makur, A., Guan, Y.L., “Perception Based Binary Image Watermarking,” Invited Session on Multimedia Watermarking and Data Hiding, IEEE International Symposium on Circuits and Systems (ISCAS) 2004, Vancouver, Canada, 23-26 May 2004
• Qiu, G., Marziliano, P., Ho, A.T.S., He, D., Sun, Q., "A Hybrid Watermarking Scheme for H.264/AVC Video," International Conference on Pattern Recognition (ICPR) 2004, Cambridge, UK, August 23-26 2004
• Ho, A.T.S., Zhu, X., Guan, Y.L., "Dual-Field Image Content Authentication,", EEE Research Journal, NTU, January 2004
• Ho, A.T.S., Zhu, X., Shen, J., "Authentication of Biomedical Images Based on Zero Location Watermarking," Eight International Conference on Control, Automation, Robotics and Vision (ICARCV) 2004, Kunming, China, December 6-9, 2004
• Ho, A.T.S., Niladri B, Puhan., Marziliano, P., Makur, A., Guan, Y.L., "Imperceptible Data Embedding in Sharply-Contrasted Binary Images," Eight International Conference on Control, Automation, Robotics and Vision (ICARCV) 2004, Kunming, China, December 6-9, 2004
• Ho, A.T.S., Shu, F., "A Robust Spread-Spectrum Watermarking Method Using Two-Level Quantization," IEEE International Conference on Image Processing (ICIP 2004), Singapore, October 24-27 2004

2003

• Zhang, J., Ho, A.T.S., “An Efficient Digital Image-in-Image Watermarking Algorithm Using the Integer Discrete Cosine Transform (IntDCT),” Watermarking and Security II, Proceedings of the Fourth International Conference on Information, Communications & Signal Processing and Fourth IEEE Pacific-Rim Conference on Multimedia, ICICS-PCM2003, 15-18 December 2003, Singapore, Vol. 2, page(s): 1163 - 1167
• Zhu, X.,Ho, A.T.S., "Slant Transform Watermarking for Copyright Protection of Satellite Images,” Watermarking and Security II, Proceedings of the Fourth International Conference on Information, Communications & Signal Processing and Fourth IEEE Pacific-Rim Conference on Multimedia, ICICS-PCM2003, 15-18 December 2003, Singapore, Pages:1178 - 1181, Vol. 2, Dec 15-18, 2003
• Ho, A.T.S., Shu, F., “A Print-and-scan Resilient Digital Watermark for Card Authentication,” Watermarking and Security II, Proceedings of the Fourth International Conference on Information, Communications & Signal Processing and Fourth IEEE Pacific-Rim Conference on Multimedia, ICICS-PCM2003, 15-18 December 2003, Singapore, pages: 1149 - 1152, Vol.2, Dec 15-18, 2003
• Ho, A.T.S., Niladri B, Puhan, Marzilano, P., Guan, Y.L., “A Novel Curvature-Weighted Distance Difference (CWDD) Perceptual Model for Binary Image Data Hiding,” ICAPR03, Calcutta, India, Dec. 10-13, 2003
• Shu, F., Ho, A.T.S., Shen, J., ,"Digital Watermarking Techniques Using Polarity of Transform Coefficients," 9th IASTED International Conference on Signal and Image Processing , August 13-15, 2003 Honolulu, Hawaii, USA
• Ho, A.T.S., Zhu, X., Shen, J., “Slant Transform Watermarking for Digital Images,” Visual Communications and Image Processing (VCIP'03), SPIE, Session on Image and Video Security and Watermarking I, Volume 5150, pp. 1912-1920, 8-11, July 2003, Lugano, Switzerland
• Ho, A.T.S., J. Shen, A. K.K. Chow, J. Woon, “Robust Digital Image-in-Image Watermarking Algorithm Using the Fast Hadamard Transform,” Invited Session on Security and Data Hiding II, IEEE International Symposium on Circuits and Systems (ISCAS) 2003, page(s): III-826 - III-829 vol.3, 25 - 28 May 2003, Bangkok, Thailand
• Ho, A.T.S., J. Shen, H.P Tan, J. Woon, “Security-Printing Authentication Using Digital Watermarking," SPIE International Technical Group Newsletter on Electronic Imaging, January 2003, Vol. 13, 1
• Ho, A.T.S., J. Shen, “ Digital Image-in-Image Watermarking for Copyright Protection of Satellite Images Using the Fast Hadamard Transform,” NTU EEE Research Bulletin, January 2003

2002

• Ho, A.T.S., J. Shen, S. H. Tan, “Character-embedded watermarking algorithm using the fast Hadamard transform for satellite images,” SPIE’s 47th Annual Meeting on Optical Science and Technology, Volume 4793, pp. 156-167, 7-11 July, 2002, Seattle, USA
• Ho, A.T.S., J. Shen, S. H. Tan, “Robust digital image-in-image watermarking algorithm using the fast Hadamard transform,” SPIE’s 47th Annual Meeting on Optical Science and Technology, Volume 4793, pp. 76-85, 7-11 July, 2002, Seattle, USA
• Ho, A.T.S., J. Shen, S. H. Tan, A.C. Kot, “Digital Image-in-Image Watermarking Technique for Copyright Protection of Satellite Images Using the Fast Hadamard Transform”, IEEE IGARSS02’, Pages:3311 - 3313 vol.6, June 24-16, 2002, Toronto, Canada
• Ho, A.T.S., J. Shen, S. H. Tan, A.C. Kot, “A novel hybrid Digital image-in-image watermarking algorithm using the fast Hadamard transform,” SPPRA’02, 25-28 June, 2002, Crete, Greece

2001

• Ho, A.T.S., J. Shen, S. H. Tan, "A Robust Digital Image-in-Image Watermarking Technique for Satellite Images," Proceedings of the Third International Conference on Information, Communications & Signal Processing and Third IEEE Pacific-Rim Conference on Multimedia, ICICS-PCM2001, 15-18 October, 2001, Singapore
• Ho, A.T.S., "Robust Copyright Protection of Satellite Images Using a Novel Digital Image-In-Image Watermarking Algorithm", IEEE IGARSS'01, page(s): 1194 - 1196 vol.3, 9-13 July 2001, Sydney, Australia
• Xia, Y., Ho, A.T.S., Ji, Y., "A Novel Wavelet Stereo Matching Method to Improve DEM Accuracy Generated from SPOT Stereo Image Pairs", IEEE IGARSS'01, page(s): 3277 - 3279 vol.7, 9-13 July 2001, Sydney, Australia
• Xia, Y., Ho, A.T.S., "Improving Data Mining of Multi-dimension Objects Using the Hybrid of Database and Visualization System", SPIE's 15th Annual International Symposium on Aerospace/Defense Sensing, Simulation, and Controls, Volume 4368, pp. 90-95, 16-20 April, 2001, Orlando, Florida, USA
• Ji, Y., Ho, A.T.S., "Efficient Multi-resolution Wavelet Hybrid Matching Method for Satellite Images", SPIE's 15th Annual International Symposium on Aerospace/Defense Sensing, Simulation, and Controls, Volume 4391, pp. 291-302, 16-20 April, 2001, Orlando, Florida, USA
• Tam, S.C., Neo, W. P., Foong, S.C., Chan, C.H., Ho, A.T.S., Chua, H.C., Lee, S., "Fuzzy Logic Control of a Nitrogen Laser ", Optical Engineering, Volume 40, Issue 2, pp. 237-244, Feb 2001

2000

• L.Y. Zhang, B.H. Soong, Ho A.T.S., and J.T. Ong, "Using RBF Algorithm for Landcover or Clutter classification In Mobile Planning", Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st, page(s): 465 - 467 vol.1, Japan 2000
• Xia, Y., Ho, A.T.S., YuCheng Zhang, "CIMO - Component Integration Model", Proceeding of Seventh Asia - Pacific Software Engineering Conference (APSEC 2000), 2000, page(s): 344 - 348
• Xia, Y., Ho, A.T.S., "3D Vector Topology Model in the Visualization System", IEEE IGARSS'00, 3000 - 3002 vol.7, 24-28 July, 2000, Hawaii, USA
• Woon, W.M., Ho, A.T.S., Yu, T., Tam, S.C., Tan, S.C., Yap, L.T., "Achieving High Data Compression of Self-Similar Satellite Images Using Fractals", IEEE IGARSS'00, pages 609 - 611 vol.2, 24-28 July, 2000, Hawaii, USA
• Ji, Y., Ho, A.T.S., Yu, T., "Using a Novel Multi-resolution Hybrid Matching Method to Improve Stereo Matching Accuracy of Satellite Images", SPIE Visual Communication and Image Processing, Volume 4067, pp. 1024-1032, 20-23 June, 2000, Perth, Australia

1983-1999

• Yu, T., Ho, A.T.S., Tam, S.C., Tan, S.C., Yap, L.T., "A Novel Hybrid Bi-orthogonal Wavelets/DPCM Algorithm for Very Low Bit Rate Satellite Image Compression", IEEE IGARSS'99, page(s): 2051 - 2053 vol.4, 28 June-2 July, 1999, Hamburg, Germany
• Ho, A.T.S., Yu, T., Tam, S.C., Tan, S.C., Yap, L.T., "Improving Vector Quantization of Satellite Images Through the Application of Bi-orthogonal Wavelets", IEEE IGARSS'99, page(s): 1171 - 1173 vol.2, 28 June-2 July, 1999, Hamburg, Germany
• Ho, A.T.S., Tam, S.C., Neo, K.B., Thia, S.P., "Using Digital Steganography for Information Security", Internet Business 99, CommunicAsia’99, Singapore, June 1999
• Tam, S.C., Neo, W. P., Chua, H.C., Ho, A.T.S., Lee, S., "A Novel Technique for Measuring the Pulse Width of Nanosecond Laser Pulses", IEEE Transactions Instrumentation and Measurement, Aug 1998, Vol. 47, 4, 997-1000
• Ho, A.T.S., Seumahu, E.S., Tam, S.C., Chin, T.W., Lim, H.S. "Improving SAR Image Classification in Tropical Region Through Fusion with SPOT Data", IEEE IGARSS'98, page(s): 1596 - 1598 vol.3, 6-10 July, 1998, Seattle, USA
• Ho, A.T.S., Seumahu, E.S., Tam, S.C., Lim, H.S., Chin, T.W. "Data Compression of Remotely Sensed Imagery Using an Adaptive Asteroid Zonal Filter", IEEE IGARSS'98, page(s): 1754 - 1756 vol.4, 6-10 July, 1998, Seattle, USA
• Ho, A.T.S., Lam, Y.L., Yang, M.C. "Dynamic Image Analysis of Crowd Density and Motion Estimation", Workshop on Signal Processing Applications (WOSPA'97), 4-5, December 1997, Brisbane, Australia
• Ma, K.K, Huang, L., Zhu, S., Ho, A.T.S., "SPOT Image Compression using Block Truncation Coding Techniques", IEEE International Geoscience and Remote Sensing Symposium, IGARSS’97, 1996-1998, 3-8 August 1997, Singapore
• Ho, A.T.S., "Detecting Clouds and Cloud Shadows in Multispectral Satellite Images for Tropical Areas", IEE Sixth International Conference on Image Processing and its Applications, IPA'97, Pages:848 - 851 vol.2, 14-17 July, 1997, Dublin, Ireland
• Tam, S.C., Chua, H., Ho, A.T.S., Low, B., "Phase-shifting Interferometer for Surface Inspection", SPIE Proceedings on Automatic Inspection and Novel Instrumentation (Vol 3185), 23-27 June 1997, Singapore
• Ho, A.T.S., Cai, Z., "Removing Clouds to Improve Classification Accuracy in Satellite Images for Tropical Regions", IEEE International Conference on Image Processing (ICIP), 16-19 September 1996, Lausanne, Switzerland
• Ho, A.T.S., Cai, Z., "Cloud Detection in Satellite Images for Tropical Regions", International Symposium on Optical Science, Engineering, and Instrumentation, Proceedings of  SPIE Volume: 2818, Multispectral Imaging for Terrestrial Applications, 4-9 August 1996, Denver, Colorado, USA, p167-171
• Cai, Z., Ho, A.T.S., "Cloud Detection and Removal in Satellite Images for Tropical Regions", IEEE 3rd International Conference on Signal Processing (ICSP), Volume: 2 , 14-18 Oct. 1996 Pages:1174 - 1177 vol.2
• Cai, Z., Ho, A.T.S., "A Cloud Detection Technique for Satellite Images of Tropical Regions", The EEE Journal, NTU, July, 1996, Vol. 8, No. 1
• Ho, A.T.S., "Applying SPC and Data Analysis Techniques to Continuous Processes in Pulp and Paper," AIChE 1994 Spring National Meeting, April 17-21, 1994, Atlanta, Georgia, USA
• Ho, A.T.S., Henriksson, C., "Improvement of Product Uniformity Using Statistical Process Control (SPC) in a BCTMP Mill", Pulp and Paper Canada, Vol. 95, 1, January, 1994, p37-40
• Ho, A.T.S., Smith, W., "Applying Digital Image Technology to Pulp and Paper", IEEE 1993 Canadian Conference on Electrical and Computer Engineering, Vancouver, September 14-17, 1993, p953-957
• Ho, A.T.S., Henriksson, C., "Improving Product Quality in a Pulp Mill Using Statistical Process Control (SPC)", IEEE 1993 Canadian Conference on Electrical and Computer Engineering, Vancouver, Canada, September 14-17, 1993, p1139-1143
• Ho, A.T.S., "Digital Image Processing for Paper Reel Property Analysis at Alberta Newsprint", Guest Speaker, First Intelligent Engineering Conference, University of Alberta , Edmonton, Canada, June 23-24, 1993
• Ho, A.T.S., Olofsson, J., Smith, W., Waithe, M., "Using Digital Image Technology to Analyse Paper Reel Properties", 79th Annual Meeting of the Canadian Pulp and Paper Association (CPPA) Technical Meeting, Montreal, Canada, January, 1993, p1-5
• Ho, A.T.S., Olofsson, J., "Using a Colour Image Display for Analysing Paper Property Profiles," Technical Association of Pulp and Paper Industry (TAPPI) Journal, Vol. 75, 11, November, 1992, p175-178
• Henriksson, C., Ho, A.T.S., "Statistical Process Control (SPC) and its Applications in a CTMP Mill," TAPPI Journal, Vol.75, 11, November, 1992, p252-254
• Ho, A.T.S., Henriksson, C., Olofsson, J., "Improvement of Product Uniformity Using Statistical Process Control (SPC) in a BCTMP Mill", Control Systems’92 Conference, Whistler, Canada, September, 1992, p311-315
• Daniels, D., Ho, A.T.S., "Report on Investigation of Sub-Surface Radar Techniques as a Method for Assessing the Integrity of Concrete Structures," ERA Report No. 35-01-0088, February 1987 
• Daniels, D., Ho, A.T.S., "High Resolution Radar Imaging of Subsurface Anomalies", NO-DIG Conference Proceedings, London, U.K., 1987
• Chignell, R. J., Jackson, P.A., Cheng, L.M., Madani, K., Ho, A.T.S., "The Feasibility of Using Radar and EMP Analysis Techniques for Plastic Mine Detection," ERA Report No. 86-0180, September 1986
• Cheng, L.M., Ho, A.T.S., Burge, R.E., "An Adaptive Asteroid Zonal Filter for Data Compression", Computer Graphics, Vision and Image Processing, 34, 1986, p292-301
• Ho, A.T.S., Cheng, L.M., Burge, R.E., "An adaptive asteroid zonal filter for digital image processing", Acta Polytechnica Scandinavia - Applied Physics Series, Vol. 149, pp86-90, June 1985.
• Cheng, L.M., Ho, A.T.S., Burge, R.E., "Use of Prior Knowledge in Image Restoration", Journal of Optical Science of America (JOSA) A, Vol. 1, 1984, p386-391
• Ho, A.T.S., "Image Information Coding, Compression and Restoration Incorporating Prior Knowledge," PhD Thesis, University of London 1983 (Supervisors: Prof RE  Burge and Prof Trevor J. Hall)
• Ho, A.T.S. "Design and Construction of a Pulsed Molecular Nitrogen Laser," MSc Thesis, Imperial College, University of London 1980 (Supervisor: Prof Wilson Sibbett)

Patents (1987 - Present)

Granted

• Ho, A.T.S., Tam, S.C., Tan, Siong Chai, Yap Lian Teck, "Methods of Digital Steganography for Multimedia Data", Singapore Patent Grant Number: P-No.79880, 30 June 2004
• Ho, A.T.S., Tam, S.C., "Methods for Embedding Image, Audio and Video Watermarks in Digital Data," Singapore Patent Grant Number: 0077474, 12 April, 2002
• Ho, A.T.S., Tam, S.C., "Methods for Embedding Image, Audio and Video Watermarks in Digital Data," Taiwan Patent Grant Number: N1-145900, 28 March, 2002
• Ho, A.T.S., "Method and Apparatus for Camouflaging Data," Singapore Patent Grant Number: 0074495, 18 June 2001
• Ho, A.T.S., Tam, S.C., "Methods for Embedding Image, Audio and Video Watermarks in Digital Data," US Patent Application Number: US 6,983,057 B1, Granted January 3, 2006

• Ho, A.T.S., Shen,J., Chow, A.K.K., Woon, J.W.M., "A Watermarking Method and Apparatus, " Singapore Patent Grant Number: 114351, March 2007

Pending and Filed

• Chow, A..K.K., Ho, A.T.S., Tan, C.T.P., Shen, J., Woon, J.W.M., "A Secure Media Storage Device and Method of Securing Media Storage Devices," PCT Application PCT/SG2007/000152, May 2007
• Ho, A.T.S., Shen,J., Chow, A.K.K., Woon, J.W.M., "A Watermarking Method and Apparatus, " PCT Application PCT/SG03/00072,  April 2003 (National Phase for US and Japan)
• Ho, A.T.S., "Method and Apparatus for Camouflaging Data," US Patent Application Number: 09/622,470, 17 August 2000 
• Chignell, R., Madani, K., Cheng, L.M., Ho, A.T.S., "A Method and Apparatus for Detecting Buried Articles," UK No. 8629420, Filed 1987

Teaching

My teaching activities include the MSc module on Introduction to Multimedia Security (CSM24) which covers topics such as cryptography, steganography, watermarking and biometrics, and  the module on Digital Watermarking and Authentication. I am also the Programme Director for the  MSc course on Security Technologies and Applications.  Please kindly contact me if you are interested (a.ho@surrey.ac.uk). 

Departmental Duties

My Department duties include the following responsibilities:

• Deputy Head of Department
• Director for Postgraduate Studies
• Faculty Member, University Senate
• MSc Programme Director, Security Technologies and Applications
• Member, Senior Management Committee
• Member, Research Management Committee
• Member, University's Academic Staff Development Committee

My other duties include the following:

• Served as external assessor for academic promotion:
  • Information and Communications University, Korea, 2009 (Tenured Professorship)
  • Nanyang Technological University, Singapore, 2007 (Associate Professorship) 
  • City University Hong Kong, China, 2008  (Associate Professorship)
• External MSc Validation Panel Member 
  • South Bank University, 2008
• External and Internal PhD Examiner
  • A. Vassiliou, "Film Content Analysis: A Text-Based Approach," PhD supervised by Dr Andrew Salway, Department of Computing, University of Surrey 2006
  • Qiao Li, "Using Perceptual Models to Improve QIM Based Watermarking Schemes," PhD supervised by Professor Ingemar Cox, University College London, December 2007 
  • Y.K. Sek, "Design and Study of Image Hiding Schemes," MPhil supervised by Professor LM Cheng, City University of Hong Kong, China, January 2009
  • Geong Sen Poh, "Design and Analysis of Fair Content Tracing Protocol," PhD supervised by Professor Keith Martin, Royal Holloway, University of London, March 2009
  • Rajeswari B. Matam, "Watermarking Biomedical Time Series Data," PhD supervised by Professor David Lowe, Aston University, May 2009
  • Guoxia YU,  "An on-board real-time image compression system for remote sensing satellites," PhD supervised by Dr Tanya Vladimirova, Surrey Space Centre, University of Surrey, May 2009
• Current and Past PhD Students (Main and Co-Supervisor) 
  • Weina Jiang - Halftone image watermarking
  • Zhao Xi - Robust and Semi-fragile Image watermarking and Authentication
  • David Williams (PhD CASE Award with Thales Research and Technology) - Formal Methods for Watermaking Security Protocols
  • Phiip Bateman (PhD CASE Award with Charteris Plc) - Text and Image Forensics
  • Chris Culnane (co-supervisor) - Binary Image Watermarking
  • Ainuddin Wahid Abdul Wahab (co-supervisor) - Image Steganalysis
• Graduated PhDs
  • Fan zhang (graduated 2009 - co-supervisor) - Fingerprint Image Detection and Classification
  • Jing Zhang (graduated 2008 - NTU) - Video Watermarking and Authentication Based on H.264L Format
  • Xunzhan Zhu (graduated 2007 - Nanyang Technological University (NTU)) - Digital Image Watermarking and Authentication techniques
  • Puhan B Niladri (graduated 2007 - NTU) - Perceptual and Distortion Modelling for Binary Image Watermarking