by Yeung Siu Wai. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 59-[62]). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Background --- p.4 / Chapter 2.1 --- Properties of a digital watermarking system --- p.5 / Chapter 2.2 --- Digital watermarking in still images: Spatial-domain vs Frequency- domain --- p.7 / Chapter 2.3 --- Capacity in digital watermarking --- p.8 / Chapter 3 --- A watermarking system --- p.10 / Chapter 3.1 --- Implementation of a watermarking system --- p.10 / Chapter 3.1.1 --- Embedding watermark --- p.11 / Chapter 3.1.2 --- Detecting watermark --- p.14 / Chapter 3.2 --- Robustness testing on the watermarking system --- p.18 / Chapter 3.3 --- Geometric attacks to the watermark system --- p.18 / Chapter 3.3.1 --- "The three distortions: Translation, Dilation and Rotation" --- p.19 / Chapter 3.3.2 --- The commutative property of rotation and dilation --- p.25 / Chapter 3.3.3 --- Implementation of geometric transform --- p.25 / Chapter 4 --- General Defense on Geometric Distortions --- p.28 / Chapter 4.1 --- Special designed watermark --- p.29 / Chapter 4.1.1 --- Ring-shaped watermark --- p.29 / Chapter 4.1.2 --- Phase Taylor invariance --- p.30 / Chapter 4.1.3 --- "Rotation, dilation and translation invariant watermark" --- p.31 / Chapter 4.2 --- Distortion detection --- p.34 / Chapter 4.2.1 --- Brute-force method --- p.35 / Chapter 4.2.2 --- Interactive method --- p.37 / Chapter 5 --- Specific Defense in Geometric Distortions - Phase angle com- parison --- p.43 / Chapter 5.1 --- Translation Detection --- p.44 / Chapter 5.2 --- Dilation Detection --- p.46 / Chapter 5.3 --- Rotation Detection --- p.49 / Chapter 6 --- Further work --- p.54 / Chapter 6.1 --- Large scale distortion detection --- p.54 / Chapter 6.2 --- Mixed geometric distortions --- p.55 / Chapter 7 --- Conclusion --- p.57 / Bibliography --- p.59

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Thesis (D. Mus. Arts)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 104-110).

Thesis (Ph.D.)--University of Wollongong, 2004. / Typescript. Includes bibliographical references: leaf 195-202.

Το πεδίο έρευνας της παρούσας διδακτορικής διατριβής είναι η ευφυής διαχείριση ιατρικών δεδομένων και πιο συγκεκριμένα ιατρικό βίντεο που επιτυγχάνεται κυρίως με την ενσωμάτωση κλινικών δεδομένων με τη χρήση ψηφιακής υδατογραφίας στο ιατρικό βίντεο. Η ψηφιακή υδατογραφία είναι το ερευνητικό πεδίο που ασχολείται με τη διαδικασία ενσωμάτωσης κρυφών πληροφοριών σε ένα σήμα. Η συγκεκριμένη ερευνητική εργασία επικεντρώνεται σε ένα μη ορατό και εύρωστο υδατογραφικό σχήμα για ιατρικό βίντεο. Μια συχνή απαίτηση για τα υδατογραφικά σχήματα είναι η ικανότητα τυφλής αποκωδικοποίησης, η αποκωδικοποίηση δηλαδή χωρίς το αρχικό σήμα. Στην ερευνητική εργασία σχεδιάστηκε και υλοποιήθηκε ένα υδατογραφικό σχήμα που σκοπό έχει τη χρήση του από ιατρικούς οργανισμούς για την προστασία των ιατρικών δεδομένων που παρέχουν τα ιατρικά βίντεο καθώς και την ευφυή διαχείριση των κλινικά χρήσιμων δεδομένων για διαγνωστικούς και εκπαιδευτικούς σκοπούς. Πιο συγκεκριμένα το σύστημα εφαρμόζει τρισδιάστατο μετασχηματισμό κυματιδίων σε ιατρικά βίντεο και ενσωματώνει πολλαπλά υδατογραφήματα, με διαφορετικές ανάγκες σε απαιτήσεις για ακεραιότητα και αδιορατότητα, χωρίς ωστόσο να αλλοιώνει τη διαγνωστική αξία των ιατρικών εξετάσεων. Καθώς η χρησιμότητα της εφαρμογής υδατογραφικών σχημάτων στις ιατρικές εικόνες είναι διεθνώς αναγνωρισμένη, ενώ αντίθετα δεν έχει γίνει μέχρι στιγμής καμία προσέγγιση για ιατρικά βίντεο, η παρούσα ερευνητική εργασία αποτελεί μια καινοτόμα προσέγγιση στην εισαγωγή υδατογραφίας και στα ιατρικά βίντεο, η οποία παράλληλα διαχειρίζεται ευφυώς τις κλινικές διαγνώσεις που προκύπτουν από αυτά. / The research field of this Ph.D thesis is the intelligent management of medical data, and more specifically medical video which is achieved based on the embedding of clinical data through the use of digital watermarking, on the medical video. Digital watermarking is the research field that uses a process to embed hidden information into a signal. The Ph.D thesis focuses on a non visible and robust watermarking scheme for medical videos. A common requirement of watermarking schemes is the ability to blindly decode a message without the use of the original signal. On the current work, a watermarking scheme was designed and implemented aiming to be used by medical organizations to protect medical data and to intelligent manage clinical useful data for diagnostic and educational purposes. In particular the system performs a three dimensional discrete wavelet transform into medical videos and embeds multiple watermarks with different requirements for integrity and imperceptibility without degradation of the diagnostic value of the medical examinations. The use of watermarking schemes on medical images is well established by the international literature. The use of a watermarking scheme for medical videos has not been achieved until today. The present scientific works proposes an innovative approach for medical video watermarking, that intelligently manages at the same time clinical diagnosis from the examinations.

Reliable communication is an important part of everyday living. When transmitting a message over a physical channel, noise is introduced that causes errors in the message. These errors can be inversion errors or synchronization errors. The aim of this thesis is to investigate coding techniques to minimise the effect of synchronization errors that occurred in a transmitted message. Watermarks are inserted into the encoded sequence. A neural network system is implemented before the decoder to detect the watermark and regain synchronization. / Prof. H. C. Ferreira

This work positions itself within the field of non-woven material design in a light and interior context. The aim of KNIT-NET is to design watermarks for papermaking through knitted textile structures. Watermarks are conventionally produced by creating a variation in the thickness of the paper fibres during the wet-paper phase of papermaking. This design is clearly visible when the paper is held up to a light source. Usually weaving techniques are used in order to filter out the water from the cellulosic pulp. Prior knowledge of plant fibre papermaking and traditional watermarking techniques was during the summer 2020. Subsequently, the ideas to explore the project further were raised during this degree project. The primary motive is to find other ways to produce water markings and texturizing to non-woven materials, by investigating knitted surfaces and yarns that will be functional in a wet process in papermaking. The material should provide organic structure and shaded pattern to the non-woven cellulosic textiles. Several cellulosic fibres were explored during this study; long staple cotton and sisal hemp fibres were the final materials of choice. The fibres were boiled and beaten into pulp, then applied on top of the knitted net designs in order to shape the paper sheets. The various knitted structures guided the choice of fibres, since the textiles affected the material properties and aesthetics of the final paper designs. The result is a collection of paper artefacts that visualise the value of non-woven paper material in an interior and light context. The muted colours becomes more visible and stronger when light is shining through. The knitted structures, in combination with the opaque and transparent cellulosic fibres, are perceived differently depending on the source of light, the direction of the light, as well as what time in the day. KNIT-NET is also a contribution to the method of utilising knitted textile structures to design watermarks for papermaking

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002. / Includes bibliographical references (leaves 65-68). Also available in electronic version. Access restricted to campus users.

With more and more ICs being used in sectors requiring confidentiality and integrity like payment systems, military, finance and health, there is a lot of concern in the security and privacy of ICs. The widespread adoption of Intellectual Property (IP) based designs for modern systems like system on chips has reduced the time to market and saved a lot of money for many companies. But this has also opened the gates for problems like product piracy, IP theft and fraud. It is estimated that billions of dollars are lost annually to illegal manufacturing of Integrated Circuits. A possible solution to this problem of IP theft is to insert small circuits which are like unique IDs that only the owner or the registered verifier will know and detect in case of any conflict. The circuits that are inserted are called watermarks and are in some cases kept very small so as to be hidden. In such cases, we would need detection schemes that work well even with very small watermarks. In this work, we use Electro-Magnetic (EM) based side-channels for the detection of watermarks. Since the 90s, Side-channel Analyses have attracted significant attention within the cryptographic community as they are able to obtain secret information from smart cards and ICs. The power side-channel analysis is a very powerful method but EM side-channels are very useful as they will not need a resistor in series to the power supply and just needs passive observation of the EM radiations emanated by the IC. This passive monitoring will be a big advantage in the case of automated watermark detection used by a verifier. In this work, we start with EM side-channel analysis on FPGA for smaller designs. We insert watermarks on a Micro-controller, Smartcard and an FPGA and detect these watermarks using EM side-channel information emanated from the Design under Test. We used environments with different levels of noise interference. We compare the watermarking application using EM side-channels and Power side-channels in these different setups. These watermarks are very small and are hard to attack or remove by an attacker through reverse engineering or side-channel information. Due to the robustness against such attacks and the easy access of EM side-channels when compared to power side-channels, the EM side-channel based watermarks will be a very good solution for the IP theft problem. EM side-channel based watermark detection supports automation which companies of IP cores can make use of. We also extended this work to EM Side-channel Trojans as the concepts are similar

Surface sealing and hardpans in loam soils are problematic in the Mid-South U.S. because of intense tillage. Two experiments quantified the effects of soil management practices on infiltration and maize yield in loam soils. The first study measured the impacts of in-row subsoiling frequency × furrow irrigation frequency. In-row subsoiling significantly improved the infiltration of irrigation but not the infiltration of precipitation. In-row subsoiling with low irrigation frequency is optimal to achieve profitable maize yields while encouraging groundwater conservation. In the second study, six soil management treatments were imposed. For single-ring infiltrometer tests, infiltration rates were different between the two measurement dates but not between measured treatments. In 2022, neutron attenuation data indicated no differences in soil water content between measured treatments. Based on both studies, in-row subsoiling was proven to be an economically viable option in comparison to other Mississippi Delta on-farm conservation practices in the short term.