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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

A new approach to the generation of Gray scale Chinese fonts.

January 1993 (has links)
by Poon Chi-cheung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves 82-84). / Abstract / Acknowledgments / Preface / Chapter Chapter 1: --- Font Systems --- p.1 / Representations of Character Images --- p.1 / Characteristics of Chinese Font System --- p.3 / Large Character Set --- p.3 / Condensed Strokes --- p.4 / Low Repetition Rate --- p.5 / WYSIWYG (What You See Is What You Get) --- p.6 / Chapter Chapter 2: --- Human Visual System and Gray Scale Font --- p.9 / Human Visual System --- p.9 / Physiology --- p.9 / Spatial Frequencies --- p.10 / How much resolution is enough --- p.11 / Screen and Printer --- p.12 / Raster Display Devices --- p.13 / Printer --- p.14 / Resolution --- p.15 / Gray Scale Font --- p.15 / Generation of Gray Scale Font --- p.18 / Chapter Chapter 3: --- Digital Filtering Method for Gray Scale Font --- p.19 / Filtering Process --- p.19 / Weighted Functions --- p.21 / Generation of Gray Scale Character --- p.23 / Results --- p.24 / More Experiments --- p.24 / Problems --- p.26 / Speed and Storage --- p.26 / Impression of Strokes --- p.27 / Thin strokes in the small-size character --- p.30 / New Approach to Generate Gray Scale Font --- p.30 / Chapter Chapter 4: --- Rasterization Algorithms --- p.32 / Outline Font --- p.32 / TrueType Font --- p.33 / Scan Conversion --- p.35 / Basic Outline-to-Bitmap Conversion --- p.35 / Scan-converting Polygon --- p.36 / Rasterization of a character --- p.36 / Intersecting Points and Ranges --- p.37 / Straight Lines --- p.37 / Quadratic Bezier Curves --- p.38 / Implementation Techniques --- p.39 / Approximation of quadratic Bezier curve by straight lines --- p.39 / Simplification of the Filling Process --- p.41 / The Rasterization Algorithm --- p.45 / Chapter Chapter 5: --- Direct Rasterization with Gray Scale --- p.46 / Rasterization with Gray Scale --- p.46 / Determination of Gray Value of Boundary-pixel --- p.50 / Preliminary Results --- p.54 / Hinting --- p.56 / Rasterization with Hinting --- p.56 / Strokes Migration --- p.57 / Hints Finding --- p.59 / Chapter Chapter 6: --- Results and Conclusion --- p.62 / Quality --- p.66 / Comparison with Black-and-White Character --- p.66 / Hinted Against Unhinted --- p.71 / Generation Speeds --- p.75 / Discussion and Comments --- p.78 / Practical Font System --- p.79 / Conclusion --- p.80 / Bibliography --- p.82
82

Visualization of the multi-dimensional speech parameter space.

January 1993 (has links)
by Andrew Poon Ngai Ho. / Thesis (M.S.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves [97-98]). / ABSTRACT / ACKNOWLEDGMENTS / Chapter 1. --- INTRODUCTION / Chapter 2. --- REPRESENTATION OP SPEECH DATA --- p.4 / Chapter 2.1 --- SAMPLE DATA REPRESENTATION --- p.4 / Chapter 2.2 --- ANALOG LINEAR SYSTEM MODEL --- p.7 / Chapter 2.3 --- DISCRETE FOURIER TRANSFORM --- p.8 / Chapter 2.4 --- FILTER BAND REPRESENTATION --- p.8 / Chapter 2.5 --- LINEAR PREDICTIVE CODING (LPC) --- p.10 / Chapter 2.2 --- LPC CEPSTRAL COEFFICIENT --- p.13 / Chapter 3. --- MULTI-DIMENSIONAL ANALYSIS --- p.18 / Chapter 3.1 --- PURE GRAPHICAL TOOLS --- p.18 / Chapter 3.1.1 --- MULTI-HISTOGRAM --- p.18 / Chapter 3.1.2 --- STARS --- p.19 / Chapter 3.1.3 --- SPIKED SCATTERPLOT --- p.19 / Chapter 3.1.4 --- GLYPHS --- p.22 / Chapter 3.1.5 --- BOXES --- p.22 / Chapter 3.1.6 --- LIMITATIONS OF THE BASIC METHODS --- p.22 / Chapter 3.1.7 --- CHERNOFF FACES --- p.26 / Chapter 3.1.8 --- ANDREW'S CURVE --- p.27 / Chapter 3.1.9 --- LIMITATIONS OF CHERNOFF FACES AND ANDREW'S CURVE --- p.30 / Chapter 3.1.10 --- SCATTERED PLOT MATRIX --- p.30 / Chapter 3.1.11 --- PARALLEL-AXIS SYSTEM --- p.32 / Chapter 3.1.12 --- COMMON BASIC PITFALL --- p.33 / Chapter 3.2 --- PURE PROJECTION METHODS --- p.36 / Chapter 3.2.1 --- PRINCIPAL COMPONENTS ANALYSIS --- p.36 / Chapter 3.2.2 --- PRINCIPLE CO-ORDINATES ANALYSIS --- p.37 / Chapter 3.2.3 --- REGRESSION ANALYSIS --- p.38 / Chapter 3.3 --- SLICED INVERSE REGRESSION (SIR) --- p.41 / Chapter 4 --- DATA ANALYSIS --- p.50 / Chapter 4.1 --- PROGRAMS AND TEST DATA --- p.50 / Chapter 4.2 --- ACTUAL SPEECH DATA RESULTS --- p.63 / Chapter 4.2.1 --- "SINGLE UTTERANCE OF ""4"" BY SPEAKER A ONLY" --- p.66 / Chapter 4.2.2 --- "TWELVE UTTERANCES OF ""4"" BY SPEAKER A" --- p.72 / Chapter 4.2.3 --- "THREE UTTERANCES PER SPEAKER OF ""4"" BY SPEAKER A, B AND C" --- p.78 / Chapter 4.2.4 --- "TWO UTTERANCES PER DIGIT OF ""1"" TO ""9"" BY SPEAKER A" --- p.83 / Chapter 4.2.5 --- "ONE UTTERANCE PER DIGIT PER SPEAKER OF ""1"" TO ""9"" BY SPEAKER A,B,C" --- p.86 / CONCLUSION AND FURTHER WORKS --- p.93 / Chapter 5.1 --- CONCLUSION --- p.93 / Chapter 5.2 --- FURTHER WORKS --- p.94 / REFERENCES / APPENDIX I MATLAB PROGRAM LISTING FOR SIR / APPENDIX 2 C PROGRAM LISTING FOR ROTATIONAL VIEW / APPENDIX 3 C PROGRAM LISTING FOR LPC AND CEPSTRAL TRANSFORMS / "APPENDIX 4 ALL VIEWS, EIGENVALUES AND EIGENVECTORS FOR SINGLE UTTERANCE OF ""4"" BY SPEAKER A" / "APPENDIX 5 ALL VIEWS, EIGENVALUES AND EIGENVECTORS FOR 12 UTTERANCES OF ""4"" BY SPEAKER A" / "APPENDIX 6 ALL VIEWS, EIGENVALUES AND EIGENVECTORS FOR 5 UTTERANCES PER SPEAKER OF ""4"" BY SPEAKER A,B,C" / "APPENDIX 7 ALL VIEWS, EIGENVALUES AND EIGENVECTORS FOR 2 UTTERANCES PER DIGIT OF DIGIT ""l"" TO ""9"" BY SPEAKER A" / "APPENDIX 8 ALL VIEWS, EIGENVALUES AND EIGENVECTORS FOR 1UTTERANCE PER SPEAKER PER DIGIT OF ""1"" TO ""9"" BY SPEAKER A,B,C"
83

Three dimensional medical image visualization.

January 1994 (has links)
by Tin Pong. / Thesis (M.Sc.)--Chinese University of Hong Kong, 1994. / Includes bibliographical references (leaf 73). / Abstract --- p.2 / Acknowledgement --- p.4 / Table of Contents --- p.5 / Chapter I. --- Introduction --- p.8 / Chapter II. --- Segmentation Tools --- p.11 / Chapter 2.1. --- Segmentation of Object --- p.11 / Chapter 2.1.1. --- Segmentation algorithm --- p.11 / Chapter 2.1.2. --- Region growing algorithm --- p.16 / Chapter 2.2. --- Noise Reduction --- p.19 / Chapter 2.2.1. --- Median filtering --- p.19 / Chapter 2.2.2 --- Mean filtering --- p.20 / Chapter 2.3. --- Other functions --- p.21 / Chapter 2.3.1. --- Contrast enhancement and reduction --- p.21 / Chapter 2.3.2. --- Brightness increment and reduction --- p.22 / Chapter III. --- 3D Visualization Tools --- p.23 / Chapter 3.1. --- Interpolation --- p.23 / Chapter 3.1.1. --- Estimate distance between slices --- p.23 / Chapter 3.1.2. --- Trilinear Interpolation --- p.24 / Chapter 3.2. --- Projection --- p.26 / Chapter 3.2.1. --- Parallel projection --- p.26 / Chapter 3.2.2. --- Z-Buffers --- p.27 / Chapter 3.3. --- Rotation of 3D image --- p.29 / Chapter 3.4. --- Shading --- p.30 / Chapter IV. --- Description of the software developed --- p.32 / Chapter 4.1. --- Programming environment --- p.32 / Chapter 4.2. --- Software developed --- p.32 / Chapter 4.3. --- 2D object segmentation panel --- p.35 / Chapter 4.4. --- 3D object segmentation panel --- p.45 / Chapter V. --- Results and analysis --- p.56 / Chapter 5.1. --- Results of segmentation of object --- p.56 / Chapter 5.2. --- Results of 3D visualization tools --- p.64 / Chapter VI. --- Future Development --- p.70 / Chapter VII. --- Conclusion --- p.72 / References --- p.73
84

3D image segmentation. / Three-dimensional image segmentation

January 1994 (has links)
Wai-kin Vong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1994. / Includes bibliographical references (leaves 87-[91]). / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Three Dimensional Image --- p.1 / Chapter 1.2 --- Definition of segmentation --- p.2 / Chapter 1.3 --- 3D Image Segmentation --- p.3 / Chapter 1.4 --- Image Splitting Operation --- p.4 / Chapter 1.5 --- Region Merging Operation --- p.4 / Chapter 1.6 --- Split-and-merge Segmentation --- p.4 / Chapter 1.6.1 --- Selection of particular operators --- p.5 / Chapter 2 --- Overview of Image Segmentation Techniques --- p.6 / Chapter 2.1 --- Introduction --- p.6 / Chapter 2.2 --- Edge Based Method --- p.6 / Chapter 2.2.1 --- 3D Laplacian of Gaussian Filtering --- p.7 / Chapter 2.2.2 --- 3D Deformable Surfaces [8] --- p.11 / Chapter 2.3 --- Region Based Method --- p.14 / Chapter 2.3.1 --- 3D oct-tree split-and-merge --- p.15 / Chapter 2.3.2 --- 3D pyramid segmentation --- p.17 / Chapter 2.4 --- 2D segmentation Approaches --- p.20 / Chapter 2.4.1 --- 2D Image segmentation by shape description --- p.20 / Chapter 2.4.2 --- Morphological Watershed Transform (WT) --- p.23 / Chapter 2.5 --- Discussion --- p.34 / Chapter 3 --- Modification Of Digital Watershed Transform (DWT) --- p.36 / Chapter 3.1 --- Introduction --- p.36 / Chapter 3.2 --- Edge Detection --- p.37 / Chapter 3.2.1 --- Discrete Non-linear Edge Detectors --- p.37 / Chapter 3.2.2 --- Canny's Edge Detector --- p.40 / Chapter 3.2.3 --- Gradient of Gaussian Filter --- p.42 / Chapter 3.3 --- Digital Watershed Transform --- p.46 / Chapter 3.3.1 --- Introduction --- p.46 / Chapter 3.3.2 --- Modification of SKIZ --- p.46 / Chapter 3.3.3 --- Implementation --- p.51 / Chapter 4 --- Region Modeling --- p.55 / Chapter 4.1 --- Introduction --- p.55 / Chapter 4.2 --- Texture Definition --- p.57 / Chapter 4.3 --- Texture Modeling --- p.58 / Chapter 4.3.1 --- Markov Random Field (MRF) --- p.58 / Chapter 4.3.2 --- Simultaneous Autoregressive (SAR) Model --- p.59 / Chapter 4.3.3 --- Parameter Estimation --- p.61 / Chapter 4.3.4 --- A Simple model --- p.63 / Chapter 4.3.5 --- Combination of MRF parameters --- p.63 / Chapter 4.3.6 --- Similarity Measure --- p.66 / Chapter 4.4 --- Model Evaluation --- p.68 / Chapter 4.4.1 --- Classification of Different Materials --- p.68 / Chapter 4.4.2 --- Rotational Invariance --- p.69 / Chapter 4.5 --- Results and Observations --- p.72 / Chapter 5 --- Three-Dimensional Segmentation with Interactive Labeling --- p.73 / Chapter 5.1 --- Introduction --- p.73 / Chapter 5.2 --- Region Merging Scheme --- p.75 / Chapter 5.3 --- Interactive Labeling --- p.76 / Chapter 5.4 --- Experiment of 3D Guided Segmentation --- p.77 / Chapter 6 --- Conclusion --- p.81 / Chapter 6.1 --- Image Partitioning by Watershed Transform --- p.81 / Chapter 6.2 --- Image modeling by Markov Random Field --- p.82 / Chapter 6.3 --- 3D image segmentation --- p.82 / A --- p.84 / B --- p.86 / Bibliography --- p.87
85

Image motion estimation for 3D model based video conferencing.

January 2000 (has links)
Cheung Man-kin. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 116-120). / Abstracts in English and Chinese. / Chapter 1) --- Introduction --- p.1 / Chapter 1.1) --- Building of the 3D Wireframe and Facial Model --- p.2 / Chapter 1.2) --- Description of 3D Model Based Video Conferencing --- p.3 / Chapter 1.3) --- Wireframe Model Fitting or Conformation --- p.6 / Chapter 1.4) --- Pose Estimation --- p.8 / Chapter 1.5) --- Facial Motion Estimation and Synthesis --- p.9 / Chapter 1.6) --- Thesis Outline --- p.10 / Chapter 2) --- Wireframe model Fitting --- p.11 / Chapter 2.1) --- Algorithm of WFM Fitting --- p.12 / Chapter 2.1.1) --- Global Deformation --- p.14 / Chapter a) --- Scaling --- p.14 / Chapter b) --- Shifting --- p.15 / Chapter 2.1.2) --- Local Deformation --- p.15 / Chapter a) --- Shifting --- p.16 / Chapter b) --- Scaling --- p.17 / Chapter 2.1.3) --- Fine Updating --- p.17 / Chapter 2.2) --- Steps of Fitting --- p.18 / Chapter 2.3) --- Functions of Different Deformation --- p.18 / Chapter 2.4) --- Experimental Results --- p.19 / Chapter 2.4.1) --- Output wireframe in each step --- p.19 / Chapter 2.4.2) --- Examples of Mis-fitted wireframe with incoming image --- p.22 / Chapter 2.4.3) --- Fitted 3D facial wireframe --- p.23 / Chapter 2.4.4) --- Effect of mis-fitted wireframe after compensation of motion --- p.24 / Chapter 2.5) --- Summary --- p.26 / Chapter 3) --- Epipolar Geometry --- p.27 / Chapter 3.1) --- Pinhole Camera Model and Perspective Projection --- p.28 / Chapter 3.2) --- Concepts in Epipolar Geometry --- p.31 / Chapter 3.2.1) --- Working with normalized image coordinates --- p.33 / Chapter 3.2.2) --- Working with pixel image coordinates --- p.35 / Chapter 3.2.3) --- Summary --- p.37 / Chapter 3.3) --- 8-point Algorithm (Essential and Fundamental Matrix) --- p.38 / Chapter 3.3.1) --- Outline of the 8-point algorithm --- p.38 / Chapter 3.3.2) --- Modification on obtained Fundamental Matrix --- p.39 / Chapter 3.3.3) --- Transformation of Image Coordinates --- p.40 / Chapter a) --- Translation to mean of points --- p.40 / Chapter b) --- Normalizing transformation --- p.41 / Chapter 3.3.4) --- Summary of 8-point algorithm --- p.41 / Chapter 3.4) --- Estimation of Object Position by Decomposition of Essential Matrix --- p.43 / Chapter 3.4.1) --- Algorithm Derivation --- p.43 / Chapter 3.4.2) --- Algorithm Outline --- p.46 / Chapter 3.5) --- Noise Sensitivity --- p.48 / Chapter 3.5.1) --- Rotation vector of model --- p.48 / Chapter 3.5.2) --- The projection of rotated model --- p.49 / Chapter 3.5.3) --- Noisy image --- p.51 / Chapter 3.5.4) --- Summary --- p.51 / Chapter 4) --- Pose Estimation --- p.54 / Chapter 4.1) --- Linear Method --- p.55 / Chapter 4.1.1) --- Theory --- p.55 / Chapter 4.1.2) --- Normalization --- p.57 / Chapter 4.1.3) --- Experimental Results --- p.58 / Chapter a) --- Synthesized image by linear method without normalization --- p.58 / Chapter b) --- Performance between linear method with and without normalization --- p.60 / Chapter c) --- Performance of linear method under quantization noise with different transformation components --- p.62 / Chapter d) --- Performance of normalized case without transformation in z- component --- p.63 / Chapter 4.1.4) --- Summary --- p.64 / Chapter 4.2) --- Two Stage Algorithm --- p.66 / Chapter 4.2.1) --- Introduction --- p.66 / Chapter 4.2.2) --- The Two Stage Algorithm --- p.67 / Chapter a) --- Stage 1 (Iterative Method) --- p.68 / Chapter b) --- Stage 2 ( Non-linear Optimization) --- p.71 / Chapter 4.2.3) --- Summary of the Two Stage Algorithm --- p.72 / Chapter 4.2.4) --- Experimental Results --- p.72 / Chapter 4.2.5) --- Summary --- p.80 / Chapter 5) --- Facial Motion Estimation and Synthesis --- p.81 / Chapter 5.1) --- Facial Expression based on face muscles --- p.83 / Chapter 5.1.1) --- Review of Action Unit Approach --- p.83 / Chapter 5.1.2) --- Distribution of Motion Unit --- p.85 / Chapter 5.1.3) --- Algorithm --- p.89 / Chapter a) --- For Unidirectional Motion Unit --- p.89 / Chapter b) --- For Circular Motion Unit (eyes) --- p.90 / Chapter c) --- For Another Circular Motion Unit (mouth) --- p.90 / Chapter 5.1.4) --- Experimental Results --- p.91 / Chapter 5.1.5) --- Summary --- p.95 / Chapter 5.2) --- Detection of Facial Expression by Muscle-based Approach --- p.96 / Chapter 5.2.1) --- Theory --- p.96 / Chapter 5.2.2) --- Algorithm --- p.97 / Chapter a) --- For Sheet Muscle --- p.97 / Chapter b) --- For Circular Muscle --- p.98 / Chapter c) --- For Mouth Muscle --- p.99 / Chapter 5.2.3) --- Steps of Algorithm --- p.100 / Chapter 5.2.4) --- Experimental Results --- p.101 / Chapter 5.2.5) --- Summary --- p.103 / Chapter 6) --- Conclusion --- p.104 / Chapter 6.1) --- WFM fitting --- p.104 / Chapter 6.2) --- Pose Estimation --- p.105 / Chapter 6.3) --- Facial Estimation and Synthesis --- p.106 / Chapter 6.4) --- Discussion on Future Improvements --- p.107 / Chapter 6.4.1) --- WFM Fitting --- p.107 / Chapter 6.4.2) --- Pose Estimation --- p.109 / Chapter 6.4.3) --- Facial Motion Estimation and Synthesis --- p.110 / Chapter 7) --- Appendix --- p.111 / Chapter 7.1) --- Newton's Method or Newton-Raphson Method --- p.111 / Chapter 7.2) --- H.261 --- p.113 / Chapter 7.3) --- 3D Measurement --- p.114 / Bibliography --- p.116
86

Isosurface extraction and haptic rendering of volumetric data.

January 2000 (has links)
Kwong-Wai, Chen. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 114-118). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgments --- p.iii / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Volumetric Data --- p.1 / Chapter 1.2 --- Volume Visualization --- p.4 / Chapter 1.3 --- Thesis Contributions --- p.5 / Chapter 1.4 --- Thesis Outline --- p.6 / Chapter I --- Multi-body Surface Extraction --- p.8 / Chapter 2 --- Isosurface Extraction --- p.9 / Chapter 2.1 --- Previous Works --- p.10 / Chapter 2.1.1 --- Marching Cubes --- p.10 / Chapter 2.1.2 --- Skeleton Climbing --- p.12 / Chapter 2.1.3 --- Adaptive Skeleton Climbing --- p.14 / Chapter 2.2 --- Motivation --- p.17 / Chapter 3 --- Multi-body Surface Extraction --- p.19 / Chapter 3.1 --- Multi-body Surface --- p.19 / Chapter 3.2 --- Building 0-skeleton --- p.21 / Chapter 3.3 --- Building 1-skeleton --- p.23 / Chapter 3.3.1 --- Non-binary Faces --- p.24 / Chapter 3.3.2 --- Non-binary Cubes --- p.30 / Chapter 3.4 --- General Scheme for Messy Cubes --- p.33 / Chapter 3.4.1 --- Graph Reduction --- p.34 / Chapter 3.4.2 --- Position of the Tetrapoints --- p.36 / Chapter 3.5 --- Triangular Mesh Generation --- p.37 / Chapter 3.5.1 --- Generating the Edge Loops --- p.38 / Chapter 3.5.2 --- Triangulating the Edge Loops --- p.41 / Chapter 3.5.3 --- Incorporating with Adaptive Skeleton Climbing --- p.43 / Chapter 3.6 --- Implementation and Results --- p.45 / Chapter II --- Haptic Rendering of Volumetric Data --- p.60 / Chapter 4 --- Introduction to Haptics --- p.61 / Chapter 4.1 --- Terminology --- p.62 / Chapter 4.2 --- Haptic Rendering Process --- p.63 / Chapter 4.2.1 --- The Overall Process --- p.64 / Chapter 4.2.2 --- Force Profile --- p.65 / Chapter 4.2.3 --- Decoupling Processes --- p.66 / Chapter 4.3 --- The PHANToM´ёØ Haptic Interface --- p.67 / Chapter 4.4 --- Research Goals --- p.69 / Chapter 5 --- Haptic Rendering of Geometric Models --- p.70 / Chapter 5.1 --- Penalty Based Methods --- p.71 / Chapter 5.1.1 --- Vector Fields for Solid Objects --- p.71 / Chapter 5.1.2 --- Drawbacks of Penalty Based Methods --- p.72 / Chapter 5.2 --- Constraint Based Methods --- p.73 / Chapter 5.2.1 --- Virtual Haptic Interface Point --- p.73 / Chapter 5.2.2 --- The Constraints --- p.74 / Chapter 5.2.3 --- Location Computation --- p.78 / Chapter 5.2.4 --- Force Shading --- p.79 / Chapter 5.2.5 --- Adding Surface Properties --- p.80 / Chapter 6 --- Haptic Rendering of Volumetric Data --- p.83 / Chapter 6.1 --- Volume Haptization --- p.84 / Chapter 6.2 --- Isosurface Haptic Rendering --- p.86 / Chapter 6.3 --- Intermediate Representation Approach --- p.89 / Chapter 6.3.1 --- Introduction --- p.89 / Chapter 6.3.2 --- Intermediate Virtual Plane --- p.90 / Chapter 6.3.3 --- Updating Virtual Plane --- p.92 / Chapter 6.3.4 --- Preventing Force Discontinuity Artifacts --- p.93 / Chapter 6.3.5 --- Experiments and Results --- p.94 / Chapter 7 --- Conclusions and Future Research Directions --- p.98 / Chapter 7.1 --- Conclusions --- p.98 / Chapter 7.2 --- Future Research Directions --- p.99 / Chapter A --- Two Proofs of Multi-body Surface Extraction Algorithm --- p.101 / Chapter A.1 --- Graph Terminology and Theorems --- p.101 / Chapter A.2 --- Occurrence of Tripoints in Negative-Positive Pairs --- p.103 / Chapter A.3 --- Validity of the General Scheme --- p.103 / Chapter B --- An Example of Multi-body Surface Extraction Algorithm --- p.105 / Chapter B.1 --- Step 1: Building 0-Skeleton --- p.105 / Chapter B.2 --- Step 2: Building 1-Skeleton --- p.106 / Chapter B.2.1 --- Step 2a: Building 1-Skeleton and Tripoints on Cube Faces --- p.106 / Chapter B.2.2 --- Step 2b: Adding Tetrapoints and Tri-edges inside Cube --- p.106 / Chapter B.3 --- Step 3: Constructing Edge Loops and Triangulating --- p.109 / Bibliography --- p.114
87

Stereo vision without the scene-smoothness assumption: the homography-based approach.

January 1998 (has links)
by Andrew L. Arengo. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 65-66). / Abstract also in Chinese. / Acknowledgments --- p.ii / List Of Figures --- p.v / Abstract --- p.vii / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Motivation and Objective --- p.2 / Chapter 1.2 --- Approach of This Thesis and Contributions --- p.3 / Chapter 1.3 --- Organization of This Thesis --- p.4 / Chapter 2 --- Previous Work --- p.6 / Chapter 2.1 --- Using Grouped Features --- p.6 / Chapter 2.2 --- Applying Additional Heuristics --- p.7 / Chapter 2.3 --- Homography and Related Works --- p.9 / Chapter 3 --- Theory and Problem Formulation --- p.10 / Chapter 3.1 --- Overview of the Problems --- p.10 / Chapter 3.1.1 --- Preprocessing --- p.10 / Chapter 3.1.2 --- Establishing Correspondences --- p.11 / Chapter 3.1.3 --- Recovering 3D Depth --- p.14 / Chapter 3.2 --- Solving the Correspondence Problem --- p.15 / Chapter 3.2.1 --- Epipolar Constraint --- p.15 / Chapter 3.2.2 --- Surface-Continuity and Feature-Ordering Heuristics --- p.16 / Chapter 3.2.3 --- Using the Concept of Homography --- p.18 / Chapter 3.3 --- Concept of Homography --- p.20 / Chapter 3.3.1 --- Barycentric Coordinate System --- p.20 / Chapter 3.3.2 --- Image to Image Mapping of the Same Plane --- p.22 / Chapter 3.4 --- Problem Formulation --- p.23 / Chapter 3.4.1 --- Preliminaries --- p.23 / Chapter 3.4.2 --- Case of Single Planar Surface --- p.24 / Chapter 3.4.3 --- Case of Multiple Planar Surfaces --- p.28 / Chapter 3.5 --- Subspace Clustering --- p.28 / Chapter 3.6 --- Overview of the Approach --- p.30 / Chapter 4 --- Experimental Results --- p.33 / Chapter 4.1 --- Synthetic Images --- p.33 / Chapter 4.2 --- Aerial Images --- p.36 / Chapter 4.2.1 --- T-shape building --- p.38 / Chapter 4.2.2 --- Rectangular Building --- p.39 / Chapter 4.2.3 --- 3-layers Building --- p.40 / Chapter 4.2.4 --- Pentagon --- p.44 / Chapter 4.3 --- Indoor Scenes --- p.52 / Chapter 4.3.1 --- Stereo Motion Pair --- p.53 / Chapter 4.3.2 --- Hallway Scene --- p.56 / Chapter 5 --- Summary and Conclusions --- p.63
88

Stereo vision and motion analysis in complement.

January 1998 (has links)
by Ho Pui-Kuen, Patrick. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 57-59). / Abstract also in Chinese. / Acknowledgments --- p.ii / List Of Figures --- p.v / List Of Tables --- p.vi / Abstract --- p.vii / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Moviation of Problem --- p.1 / Chapter 1.2 --- Our Approach and Summary of Contributions --- p.3 / Chapter 1.3 --- Organization of this Thesis --- p.4 / Chapter 2 --- Previous Work --- p.5 / Chapter 3 --- Structure Recovery from Stereo-Motion Images --- p.7 / Chapter 3.1 --- Motion Model --- p.8 / Chapter 3.2 --- Stereo-Motion Model --- p.10 / Chapter 3.3 --- Inferring Stereo Correspondences --- p.13 / Chapter 3.4 --- Determining 3D Structure from One Stereo Pair --- p.17 / Chapter 3.5 --- Computational Complexity of Inference Process --- p.18 / Chapter 4 --- Experimental Results --- p.19 / Chapter 4.1 --- Synthetic Images and Statistical Results --- p.19 / Chapter 4.2 --- Real Image Sequences --- p.21 / Chapter 4.2.1 --- House Model' Image Sequences --- p.22 / Chapter 4.2.2 --- Oscilloscope and Soda Can' Image Sequences --- p.23 / Chapter 4.2.3 --- Bowl' Image Sequences --- p.24 / Chapter 4.2.4 --- Building' Image Sequences --- p.27 / Chapter 4.3 --- Computational Time of Experiments --- p.28 / Chapter 5 --- Determining Motion and Structure from All Stereo Pairs --- p.30 / Chapter 5.1 --- Determining Motion and Structure --- p.31 / Chapter 5.2 --- Identifying Incorrect Motion Correspondences --- p.33 / Chapter 6 --- More Experiments --- p.34 / Chapter 6.1 --- Synthetic Cube' Images --- p.34 / Chapter 6.2 --- Snack Bag´ة Image Sequences --- p.35 / Chapter 6.3 --- Comparison with Structure Recovered from One Stereo Pair --- p.37 / Chapter 7 --- Conclusion --- p.41 / Chapter A --- Basic Concepts in Computer Vision --- p.43 / Chapter A.1 --- Camera Projection Model --- p.43 / Chapter A.2 --- Epipolar Constraint in Stereo Vision --- p.47 / Chapter B --- Inferring Stereo Correspondences with Matrices of Rank < 4 --- p.49 / Chapter C --- Generating Image Reprojection --- p.51 / Chapter D --- Singular Value Decomposition --- p.53 / Chapter E --- Quaternion --- p.55
89

Interactive volume visualization in a virtual environment.

January 1998 (has links)
by Yu-Hang Siu. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 74-80). / Abstract also in Chinese. / Abstract --- p.iii / Acknowledgements --- p.v / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Volume Visualization --- p.2 / Chapter 1.2 --- Virtual Environment --- p.11 / Chapter 1.3 --- Approach --- p.12 / Chapter 1.4 --- Thesis Overview --- p.13 / Chapter 2 --- Contour Extraction --- p.15 / Chapter 2.1 --- Concept of Intelligent Scissors --- p.16 / Chapter 2.2 --- Dijkstra's Algorithm --- p.18 / Chapter 2.3 --- Cost Function --- p.20 / Chapter 2.4 --- Summary --- p.23 / Chapter 3 --- Volume Cutting --- p.24 / Chapter 3.1 --- Basic idea of the algorithm --- p.25 / Chapter 3.2 --- Intelligent Scissors on Surface Mesh --- p.27 / Chapter 3.3 --- Internal Cutting Surface --- p.29 / Chapter 3.4 --- Summary --- p.34 / Chapter 4 --- Three-dimensional Intelligent Scissors --- p.35 / Chapter 4.1 --- 3D Graph Construction --- p.36 / Chapter 4.2 --- Cost Function --- p.40 / Chapter 4.3 --- Applications --- p.42 / Chapter 4.3.1 --- Surface Extraction --- p.42 / Chapter 4.3.2 --- Vessel Tracking --- p.47 / Chapter 4.4 --- Summary --- p.49 / Chapter 5 --- Implementations in a Virtual Environment --- p.52 / Chapter 5.1 --- Volume Cutting --- p.53 / Chapter 5.2 --- Surface Extraction --- p.56 / Chapter 5.3 --- Vessel Tracking --- p.59 / Chapter 5.4 --- Summary --- p.64 / Chapter 6 --- Conclusions --- p.68 / Chapter 6.1 --- Summary of Results --- p.68 / Chapter 6.2 --- Future Directions --- p.70 / Chapter A --- Performance of Dijkstra's Shortest Path Algorithm --- p.72 / Chapter B --- IsoRegion Construction --- p.73
90

Fast interactive 2D and 3D segmentation tools.

January 1998 (has links)
by Kevin Chun-Ho Wong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 74-79). / Abstract also in Chinese. / Chinese Abstract --- p.v / Abstract --- p.vi / Acknowledgements --- p.vii / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Prior Work : Image Segmentation Techniques --- p.3 / Chapter 2.1 --- Introduction to Image Segmentation --- p.4 / Chapter 2.2 --- Region Based Segmentation --- p.5 / Chapter 2.2.1 --- Boundary Based vs Region Based --- p.5 / Chapter 2.2.2 --- Region growing --- p.5 / Chapter 2.2.3 --- Integrating Region Based and Edge Detection --- p.6 / Chapter 2.2.4 --- Watershed Based Methods --- p.8 / Chapter 2.3 --- Fuzzy Set Theory in Segmentation --- p.8 / Chapter 2.3.1 --- Fuzzy Geometry Concept --- p.8 / Chapter 2.3.2 --- Fuzzy C-Means (FCM) Clustering --- p.9 / Chapter 2.4 --- Canny edge filter with contour following --- p.11 / Chapter 2.5 --- Pyramid based Fast Curve Extraction --- p.12 / Chapter 2.6 --- Curve Extraction with Multi-Resolution Fourier transformation --- p.13 / Chapter 2.7 --- User interfaces for Image Segmentation --- p.13 / Chapter 2.7.1 --- Intelligent Scissors --- p.14 / Chapter 2.7.2 --- Magic Wands --- p.16 / Chapter 3 --- Prior Work : Active Contours Model (Snakes) --- p.17 / Chapter 3.1 --- Introduction to Active Contour Model --- p.18 / Chapter 3.2 --- Variants and Extensions of Snakes --- p.19 / Chapter 3.2.1 --- Balloons --- p.20 / Chapter 3.2.2 --- Robust Dual Active Contour --- p.21 / Chapter 3.2.3 --- Gradient Vector Flow Snakes --- p.22 / Chapter 3.2.4 --- Energy Minimization using Dynamic Programming with pres- ence of hard constraints --- p.23 / Chapter 3.3 --- Conclusions --- p.25 / Chapter 4 --- Slimmed Graph --- p.26 / Chapter 4.1 --- BSP-based image analysis --- p.27 / Chapter 4.2 --- Split Line Selection --- p.29 / Chapter 4.3 --- Split Line Selection with Summed Area Table --- p.29 / Chapter 4.4 --- Neighbor blocks --- p.31 / Chapter 4.5 --- Slimmed Graph Generation --- p.32 / Chapter 4.6 --- Time Complexity --- p.35 / Chapter 4.7 --- Results and Conclusions --- p.36 / Chapter 5 --- Fast Intelligent Scissor --- p.38 / Chapter 5.1 --- Background --- p.39 / Chapter 5.2 --- Motivation of Fast Intelligent Scissors --- p.39 / Chapter 5.3 --- Main idea of Fast Intelligent Scissors --- p.40 / Chapter 5.3.1 --- Node position and Cost function --- p.41 / Chapter 5.4 --- Implementation and Results --- p.42 / Chapter 5.5 --- Conclusions --- p.43 / Chapter 6 --- 3D Contour Detection: Volume Cutting --- p.50 / Chapter 6.1 --- Interactive Volume Cutting with the intelligent scissors --- p.51 / Chapter 6.2 --- Contour Selection --- p.52 / Chapter 6.2.1 --- 3D Intelligent Scissors --- p.53 / Chapter 6.2.2 --- Dijkstra's algorithm --- p.54 / Chapter 6.3 --- 3D Volume Cutting --- p.54 / Chapter 6.3.1 --- Cost function for the cutting surface --- p.55 / Chapter 6.3.2 --- "Continuity function (x,y, z) " --- p.59 / Chapter 6.3.3 --- Finding the cutting surface --- p.61 / Chapter 6.3.4 --- Topological problems for the volume cutting --- p.61 / Chapter 6.3.5 --- Assumptions for the well-conditional contour used in our algo- rithm --- p.62 / Chapter 6.4 --- Implementation and Results --- p.64 / Chapter 6.5 --- Conclusions --- p.64 / Chapter 7 --- Conclusions --- p.71 / Chapter 7.1 --- Contributions --- p.71 / Chapter 7.2 --- Future Work --- p.72 / Chapter 7.2.1 --- Real-time interactive tools with Slimmed Graph --- p.72 / Chapter 7.2.2 --- 3D slimmed graph --- p.72 / Chapter 7.2.3 --- Cartoon Film Generation System --- p.72

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