Publications
157 results found
Moutsopoulos KN, Gillies DF, 1997, Defomable Models for Laparoscopic Surgery Simulation, Journal of Computer Networks and ISDN Systems, Vol: 29, Pages: 1675-1683
Kwoh CK, Gillies DF, 1996, Using hidden nodes in Bayesian networks, ARTIFICIAL INTELLIGENCE, Vol: 88, Pages: 1-38, ISSN: 0004-3702
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- Citations: 28
Khan GN, Gillies DF, 1996, A vision based Navigation System for an Endoscope, Image and Vision Computing, Vol: 14, Pages: 763-772
Gillies DF, Rodrigues MAF, Charters P, et al., 1996, Predicting Difficult Anaesthesia, J.Anaesthesia
Rodrigues MAF, Gillies DF, Charters P, et al., 1996, Computer Aided Pre-Operative Laryngoscopy, Fifth International Conference on Computational Graphics and Visualisation Techniques (COMPUGRAPHICS96), Portugal
Gillies DF, Ismaili IA, Shackleton RA, et al., 1996, Computer Vision and Interactive Graphic Art in the Nature of History Exhibition, Machine Graphics and Vision, Vol: 5, Pages: 317-326
Moutsopoulos KN, Gillies DF, 1996, Defomable Models for Laparoscopic Surgery Simulation, Proceedings of the Fifth International Conference on Computational Graphics and Visualisation Techniques (COMPUGRAPHICS96), Portugal, Pages: 134-142
Riaz MS, Gillies DF, 1996, Analysis of Facial Features using one Dimensional Fourier Transform, Machine Graphics and Vision, Vol: 5, Pages: 35-50
GESSNER CE, JOWELL PS, GILLIES DF, et al., 1995, SIMULATED ENDOSCOPIC SKILLS - HOW REAL IS AN ENDOSCOPY SIMULATOR, GASTROINTESTINAL ENDOSCOPY, Vol: 41, Pages: 321-321, ISSN: 0016-5107
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- Citations: 4
Kwoh CK, Gillies DF, 1995, Estimating the initial values of unobservable variables in visual probabilistic networks, Pages: 326-333, ISSN: 0302-9743
In the construction of a probabilistic network from observed data, the fundamental assumption that the variables starting from the same parent are conditionally independent can be met by introduction of hidden node. The conditional probability matrices for the hidden node, linking observed nodes, can be determined by the gradient descent method. In our previous work in the field of medical diagnosis based on computer vision, we demonstrated that this technique does yield improved results, however the success depends on the choice of initial values for the conditional probabilities. In this paper we introduce methods that provide a good initial estimation of the hidden variables and improve our learning algorithm. With these improvements, we have found that the first solution obtained by the training algorithm is a near optimal solution, and we have eliminated the need for multiple restarts.
Huang CC, Gillies D, 1995, The determination of an autonomous vehicle's position by matching the road curvature, Conference on Mobile Robots X, Publisher: SPIE - INT SOC OPTICAL ENGINEERING, Pages: 14-24
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- Citations: 2
Huang CC, Gillies DF, 1995, Using road image to determine the pose information of an ALV, European Chinese Automation Conference (ECAC95) London
SUCAR LE, GILLIES DF, 1994, PROBABILISTIC REASONING IN HIGH-LEVEL VISION, IMAGE AND VISION COMPUTING, Vol: 12, Pages: 42-60, ISSN: 0262-8856
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- Citations: 8
Huang CC, Gillies DF, 1994, An intelligent road following system controlled by the Global Position System (GPS) and an error least square method, SPIE Ninth conference on mobile robots, Boston
KWOH CK, GILLIES DF, 1994, USING FOURIER INFORMATION FOR THE DETECTION OF THE LUMEN IN ENDOSCOPE IMAGES, 1994 Annual International Conference of the IEEE Region-10 - Frontiers of Computer Technology, Publisher: I E E E, Pages: 981-985
Guy C, Gillies DF, Burger P, et al., 1994, Realistic Computer Based Endoscopy Training, Proc ASGE (New Orleans) Gastrointestinal Endoscopy
Ismaili IA, Gillies DF, 1994, Colour Image Segmentation Using regression analysis in RGB space, Machine Graphics and Vision, Vol: 3, Pages: 373-384
SUCAR LE, GILLIES DF, GILLIES DA, 1993, OBJECTIVE PROBABILITIES IN EXPERT SYSTEMS, ARTIFICIAL INTELLIGENCE, Vol: 61, Pages: 187-208, ISSN: 0004-3702
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- Citations: 16
HARITSIS A, GILLIES DF, GUY CN, et al., 1993, TEACHING PARADOXICAL COLONOSCOPE BEHAVIOR BY COMPUTER-SIMULATION, GASTROENTEROLOGY, Vol: 104, Pages: A11-A11, ISSN: 0016-5085
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- Citations: 1
WILLIAMS C, GUY C, GILLIES D, et al., 1993, ELECTRONIC 3-DIMENSIONAL IMAGING OF INTESTINAL ENDOSCOPY, LANCET, Vol: 341, Pages: 724-725, ISSN: 0140-6736
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- Citations: 34
GILLIES D, HARITSIS A, WILLIAMS C, 1992, COMPUTER-SIMULATION FOR TEACHING ENDOSCOPIC PROCEDURES, ENDOSCOPY, Vol: 24, Pages: 544-548, ISSN: 0013-726X
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- Citations: 16
KHAN GN, GILLIES DF, 1992, EXTRACTING CONTOURS BY PERCEPTUAL GROUPING, IMAGE AND VISION COMPUTING, Vol: 10, Pages: 77-88, ISSN: 0262-8856
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- Citations: 14
Gillies DG, Matthews SJ, Sutcliffe LH, 1992, Variable temperature, frequency and high pressure carbon-13 NMR relaxation studies of a traction fluid and some of its analogues, Journal of Molecular Liquids, Vol: 54, Pages: 181-191, ISSN: 0167-7322
Haritsis A, Gillies D, Williams C, 1992, Realistic Generation and Real Time Animation of Images of the Human Colon, Computer Graphics Forum, Vol: 11, Pages: 367-379, ISSN: 0167-7055
A simulator has been built to teach doctors the skill of handling a flexible endoscope for gastrointestinal investigations. Trainees use a dummy endoscope in which the control actions are transduced into voltages and sensed by the computer. The simulator computes the position and viewing direction of the endoscope within an internal model of the human colon. Then a renderer draws the view, reproducing as far as possible what would be seen during a real colonoscopy. Since the system must generate at least ten frames per second for realistic animation, standard rendering techniques, such as ray tracing, could not be used. Consequently a new method was devised, based on identifying coherent regions along each scan line which can be rendered by table lookup. The method allows shaded Lambertian surfaces to be drawn at a frame rate of 15 per second, using modest computing resources. Although several approximations were required in the analysis, the computer images of the internal surfaces of the human colon present a high degree of visual realism. © 1992 Eurographics Association
WILLIAMS CB, GILLIES DF, HARITSIS A, 1991, AN ENDOSCOPY SIMULATOR FOR TEACHING COLONOSCOPY, GUT, Vol: 32, Pages: A1232-A1232, ISSN: 0017-5749
GILLIES D, 1991, COMPUTER-GRAPHICS SIMULATION FOR TEACHING, ENDOSCOPY, Vol: 23, Pages: 305-305, ISSN: 0013-726X
SUCAR LE, GILLIES DF, GILLIES DA, 1991, HANDLING UNCERTAINTY IN KNOWLEDGE-BASED COMPUTER VISION, LECTURE NOTES IN COMPUTER SCIENCE, Vol: 548, Pages: 328-332, ISSN: 0302-9743
SUCAR LE, GILLIES DF, GILLIES DA, 1991, HANDLING UNCERTAINTY IN KNOWLEDGE-BASED COMPUTER VISION, EUROPEAN CONF ON SYMBOLIC AND QUANTITATIVE APPROACHES TO UNCERTAINTY, Publisher: SPRINGER-VERLAG BERLIN, Pages: 328-332, ISSN: 0302-9743
Khan GN, Gillies DF, 1990, A parallel-hierarchical method for grouping line segments into contours, Proceedings of SPIE - The International Society for Optical Engineering, Vol: 1153, Pages: 237-246, ISSN: 0277-786X
A highly parallel technique for linking line segments into curved contours or boundaries has been developed. This bottom-up organization of the line segments utilizes information in the line data itself and perceptual organization rules which are domain independent. The line segments can be detected on a local basis and are amenable to parallel computation.1 A line pyramid structure is employed where the two bottom levels of the pyramid hold the line segments extracted from predefined image windows (e.g. 4 × 4 and 8 × 8). The pyramid is based on a 4 × 4 overlapping neighbourhood and each processing element is connected to four parents and sixteen children. Starting from the lower level, each processing element performs grouping on the line data supplied by all of its children but it only keeps the grouped line segments supplied by its central 2 × 2 children for passing on to the parents. The main grouping criteria employed to achieve the aggregation of line segments are proximity, Mares theta-aggregation,2 curvilinearity, continuity and similarity in line contrast. By the time the root processor of the pyramid is reached, all the groups of line segments are formed and they are then replaced by contours. The main features of the method are its parallel implementation on a pyramid architecture computer and use of domain independent perceptual grouping principles. © 1990 SPIE.
WILLIAMS CB, BAILLIE J, GILLIES DF, et al., 1990, TEACHING GASTROINTESTINAL ENDOSCOPY BY COMPUTER-SIMULATION - A PROTOTYPE FOR COLONOSCOPY AND ERCP, GASTROINTESTINAL ENDOSCOPY, Vol: 36, Pages: 49-54, ISSN: 0016-5107
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- Citations: 49
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