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Fixing of Facial Triangle Meshes
Nekvinda, Tomáš ; Pelikán, Josef (advisor) ; Krajíček, Václav (referee)
The purpose of this work is to create an algorithm for automatic cleaning and trimming of three-dimensional facial scans. In view of that, we have developed an algorithm which consists of three central parts. The frst part is a novel landmark detection algorithm based on discrete diferential geometry and machine learning methods. The second part is represented by a method removing defects, spikes, and blobs and the last part is an enhancement of an algorithm for hole flling. The outcome of this work is a program which can automatically clean and trim three-dimensional facial scans and moreover, it can detect nose tip, nose root, and mouth and eye corners. As our testing has shown, the program performs well on facial scans produced by the optical scanner Vectra3D.
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Surface Reconstruction from Point Clouds
Jarůšek, Tomáš ; Zemčík, Pavel (referee) ; Španěl, Michal (advisor)
Surface reconstruction from point clouds represents very modern and widespreadly used method for digitalization of real surfaces. The main focus of this work is on a comparison of several algorithms (Poisson surface reconstruction, Ball Pivoting Algorithm, Fourier surface reconstruction, Wavelet surface reconstruction and Multi-level Partition of Unity implicits) that reconstruct original surface in a form of triangle mesh from an oriented point cloud. Every algorithm was used in a series of tests on both real and synthetic datasets which were also modified to suit more complicated experiments. The following evaluation is done in various categories. The results are evaluated both visualy and with calculated measures (such as Hausdorff distance). Together these experiments depict a detailed analysis of the state of surface reconstruction algorithms. Our experimets show that the selection of optimal algorithm depends on a concrete task. Overall Possion surface reconstruction and Fourier surface reconstruction provide the best results.
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Mobile 3D mesh viewer
Pikora, Jindřich ; Pelikán, Josef (advisor) ; Dupej, Ján (referee)
This thesis deals with the development of MorphoView application for An- droid mobile devices. The application can be used for viewing triangular meshes with texture and possibly other attributes. It will be used primarily for data pre- sentation in geometric morphometry (facial scans, palate). During development, emphasis was placed on robustness, ease of use and the possibility of easy future expansion of other data layers. A client-server system has been designed and implemented, in which models are downloaded from the server to the mobile de- vice as needed. Easy distribution of access information uses QR codes, privacy of scanned individuals is sufficiently protected. The author of the thesis developed a complete client part, not a server.
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Symmetry of triangle meshes
Vévoda, Petr ; Pelikán, Josef (advisor) ; Krajíček, Václav (referee)
Triangle meshes belong to methods of storing a surface of a threedimensional object in computer memory. A human face can be represented this way too. Findings about symmetry of faces are valuable for a variety of fields of study such as anthropology, medicine, criminalistics or psychology. For computing an approximate plane of symmetry of a face we have proposed an algorithm based on a gradient method, which minimizes distance between its mesh and its symmetric image over a set of all planes. However, it is possible to apply this algorithm to an arbitrary mesh and use its landmarks too. We have integrated the implementation covering also results visualization into Morphome3cs project focused on computations in anthropology.
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Sketching 3D Models
David, Tomáš ; Hulík, Rostislav (referee) ; Kršek, Přemysl (advisor)
This thesis deals with the processing and representation of polygonal models. It is devoted to methods for creating and editing 3D models, especially the sketching method. It describes the procedure for design and implementation of a simple plug-in for application OpenFlipper. This plug-in allows creation of 3D model of object by drawing a closed line.
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