Gouenou COATRIEUX

One of our latest results consists in a watermarking psychovisual mask for radiographic images. Our reversible or lossless scheme, based on dynamic histogram shifting modulation, still provides a PSNR of about 1-2 dB better than any other approaches for the same embedding capacity.

• W. Pan, D. Bouslimi, M. Karasad, M. Cozic, G. Coatrieux, Imperceptible reversible watermarking of radiographic images based on quantum noise masking, Computer Methods and Programs in Biomedicine, 160 (2018), pp. 119-128.
• G. Coatrieux, W. Pan, N. Cuppens-Boulahia, F. Cuppens, Ch.Roux: Reversible Watermarking Based on Invariant Image Classification and Dynamic Histogram Shifting. IEEE Transactions on Information Forensics and Security 8(1): 111-120 (2013)
• Pan, W.; Coatrieux, G.; Cuppens, N.; Cuppens, F.; Roux, C., "An additive and lossless watermarking method based on invariant image approximation and Haar wavelet transform," Engineering in Medicine and Biology Society (EMBC), 2010 Annual International Conference of the IEEE, vol., no., pp 4740,4743, Aug. 31 2010-Sept. 4 2010.

We proposed watermarking schemes that are robust to affine transformations. They are based on image invariants (e.g. legendre invariants) and are adapted to color images.

• J. Ouyang, G. Coatrieux, B. Chen, H. Shu, "Color Image Watermarking based on Quaternion Fourier Transform and Improved Uniform Log-Polar Mapping", Computers & Electrical Engineering 46:419-432 (2015).
• H. Zhang, H. Shu ; G. Coatrieux, J. Zhu, Q.M.J. Wu, Y. Zhang ; H. Zhu, L. Luo: Affine Legendre Moment Invariants for Image Watermarking Robust to Geometric Distortions, IEEE Transactions on Image Processing, Vol. 20, no. 8, 2011, pp. 2189 – 2199.

We work on verifying the integrity of medical images blindly (blind forensics) or with the help of image signatures and watermarking. We also study how to prove the origin of scanner and radiographic images. We recently started developing solutions for flatbed scanners.

• C. Ben Rabah, G. Coatrieux, R. Abdelfattah, "Scanner model identification of official documents using noise parameters estimation in the wavelet domain", Advanced Concepts for Intelligent Vision Systems, Springer International Publishing, 2018, pp. 598-608.
• Y. Duan, D. Bouslimi, G. Yang, H. Shu, G. Coatrieux, "Computed Tomography Image Origin Identification Based on Original Sensor Noise and 3D Image Reconstruction Algorithm Footprints", IEEE J. Biomedical and Health Informatics (2016)
• J. Ouyang, G. Coatrieux, H. Shu, "Robust hashing for image authentication using quaternion discrete Fourier transform and log-polar transform", Digital Signal Processing, Vol.41, June 2015, pp. 98-109,
• Y. Duan; G. Coatrieux, H. Shu, "Identification of Digital Radiography Image Source Based on Digital Radiography Pattern Noise Recognition", 2014 IEEE Int. Conf. on Image Processing (ICIP), 2014, pp. 5372-5376.
• G. Coatrieux, H. Huang, H. Shu, L. Luo, Ch. Roux: A Watermarking based Medical Image Integrity Control and an Image Moment Signature for Tampering Characterization, IEEE J. Biomedical and Health Informatics 17(6):111-120 (2013)
• H. Huang, G. Coatrieux, H. Shu, L. Luo, Ch. Roux: Blind Integrity Verification of Medical Images. IEEE Transactions on Information Technology in Biomedicine 16(6): 1122-1126 (2012)

Joint Watermarking-Encryption, Watermarking of Encrypted Data and joint watermarking-compression of images - We suggest combining both technologies so as to allow verifying the integrity of an image even if this one is encrypted or compressed. We are now focusing on how to take into account image compression.

• S. Haddad, G. Coatrieux, M. Cozic, "A new joint watermarking-encryption-jpeg-ls compression method for a priori & a posteriori image protection", International Conference on Image processing, ICIP, 2018, pp. 1688-1692.
• S. Haddad, G. Coatrieux, M. Cozic, D. Bouslimi, Joint watermarking and lossless jpeg-ls compression for medical image security, IRBM, 38 (2017), pp. 198-206.
• D. Bouslimi, G. Coatrieux, M. Cozic, Ch. Roux: Data Hiding in Encrypted Images based on Predefined Watermark Embedding before Encryption Process.  Sig. Proc. Image Comm, 47:263-270 (2016).
• D. Bouslimi, G. Coatrieux: A Crypto-Watermarking System for Ensuring Reliability Control and Traceability of Medical Images. Sig. Proc. Image Comm, 47:160-169 (2016).
• D. Bouslimi, G. Coatrieux, M. Cozic, Ch. Roux: A Joint Encryption/Watermarking System for Verifying the Reliability of Medical Images. IEEE Transactions on Information Technology in Biomedicine 16(5): 891-899 (2012)

We started to work on the processing of encrypted data outsourced and mutualized into the cloud. We recently proposed a proxy re-encryption solution that allows sharing homomorphically encrypted data as well as the first secure perceptron  able to learn on encrypted data.

• R. Bellafqira, G. Coatrieux, M. Cozic, "Secure multilayer perceptron based on homomorphic encryption", 17th International Workshop on Digital-forensics and Watermarking, IWDW, vol. LNCS 11378, 2018, pp. 1-15.
• R. Bellafqira, G. Coatrieux, D. Bouslimi, G. Quellec and M. Cozic, "Proxy Re-Encryption Based on Homomorphic Encryption", Proceedings of the 33rd Annual Computer Security Applications Conference, ACSAC 2017, 2017, pp. 154—161.
• D. Bouslimi, R. Bellafqira, G. Coatrieux, "Data Hiding in Homorphically Encrypted Medical Images for Verifying thir Reliability in both encrypted and Spatial Domains", EMBC 2016: 2496-2499.
• R. Bellafqira, G. Coatrieux, D. Bouslimi, G. Quellec, "An End to End Secure CBIR Over Encrypted Medical Database", EMBC 2016: 2537-2540.
• R. Bellafqira, G. Coatrieux, D. Bouslimi, G. Quellec, "Content-Based Image Retrieval in Homomorphic Encryption Domain", EMBC 2015:2944-2947.

Since several years we have been working on database watermarking. Among our major results, we proposed the first lossless watermarking method for categorical data and the first ontology based semantic masking strategy for hiding a watermark. We recently introduced a joint watermarking-homomorphic encryption solution that a cloud can use so as to protect data.

• D. Niyitegeka, G. Coatrieux, R. Bellafqira, E. Genin, J. Franco-Contreras, "Dynamic watermarking-based integrity protection of homomorphically encrypted databases - application to outsourced genetic data", 17th International Workshop on Digital-forensics and Watermarking - IWDW, 2018, vol. LNCS 11378, 2018, pp.
• J. Franco-Contreras, G. Coatrieux, "Protection of Relational Databases by Means of Watermarking: -Recent Advances and Challenge", Chapter 5, Advances in Security in Computing and Communications, J. Sen, ed., InTech, Rijeka, 2017, pp. 101-121.
• J. Franco-Contreras, G. Coatrieux, "Databases traceability by means of watermarking with optimized detection", 15th International Workshop on Digital-forensics and Watermarking - IWDW, 2016, pp. 343-357.
• J. Franco-Contreras, G. Coatrieux, "Robust Lossless Watermarking of Relational Databases with Ontology-Guided Distortion Control," Information Forensics and Security, IEEE Transactions on , vol.10, no.9, pp.1939,1952, Sept. 2015.
• J. Franco-Contreras, G. Coatrieux, F. Cuppens, N. Cuppens-Boulahia, C. Roux, "Robust Lossless Watermarking of Relational Databases Based on Circular Histogram Modulation," Information Forensics and Security, IEEE Transactions on , vol.9, no.3, pp.397,410, March 2014. 
• G. Coatrieux, E. Chazard, R. Beuscart, C. Roux, "Lossless watermarking of categorical attributes for verifying medical data base integrity”, IEEE-EMBC 2011: 33th IEEE Annual International Conference of the Engineering in Medicine and Biology Society, 2011, pp. 8195-8198.

In this work we embed an image knowledge digest that describes the image content and specifies how to compare images. We also reversibly watermark JPEG compressed images.

• G. Coatrieux, C.Le Guillou, J.-M. Cauvin, Ch. Roux, "Reversible Watermarking for Knowledge Digest Embedding and Reliability Control in Medical Images," Information Technology in Biomedicine, IEEE Transactions on , vol.13, no.2, pp.158-165, March 2009 doi: 10.1109/TITB.2008.2007199

A new a posteriori access control and security control framework is proposed; it has been implemented considering ATNA Logs defined by IHE.

• H. Azkia, N. Cuppens-Boulahia, F. Cuppens, G. Coatrieux: Ontology based log content extraction engine for a posteriori security control. Stud. Health Technol. Inform. 2012; 180:746-50.