1,411 research outputs found
Mean value coordinates–based caricature and expression synthesis
We present a novel method for caricature synthesis based on mean value coordinates (MVC). Our method can be applied to any single frontal face image to learn a specified caricature face pair for frontal and 3D caricature synthesis. This technique only requires one or a small number of exemplar pairs and a natural frontal face image training set, while the system can transfer the style of the exemplar pair across individuals. Further exaggeration can be fulfilled in a controllable way. Our method is further applied to facial expression transfer, interpolation, and exaggeration, which are applications of expression editing. Additionally, we have extended our approach to 3D caricature synthesis based on the 3D version of MVC. With experiments we demonstrate that the transferred expressions are credible and the resulting caricatures can be characterized and recognized
Unstructured un-split geometrical Volume-of-Fluid methods -- A review
Geometrical Volume-of-Fluid (VoF) methods mainly support structured meshes,
and only a small number of contributions in the scientific literature report
results with unstructured meshes and three spatial dimensions. Unstructured
meshes are traditionally used for handling geometrically complex solution
domains that are prevalent when simulating problems of industrial relevance.
However, three-dimensional geometrical operations are significantly more
complex than their two-dimensional counterparts, which is confirmed by the
ratio of publications with three-dimensional results on unstructured meshes to
publications with two-dimensional results or support for structured meshes.
Additionally, unstructured meshes present challenges in serial and parallel
computational efficiency, accuracy, implementation complexity, and robustness.
Ongoing research is still very active, focusing on different issues: interface
positioning in general polyhedra, estimation of interface normal vectors,
advection accuracy, and parallel and serial computational efficiency.
This survey tries to give a complete and critical overview of classical, as
well as contemporary geometrical VOF methods with concise explanations of the
underlying ideas and sub-algorithms, focusing primarily on unstructured meshes
and three dimensional calculations. Reviewed methods are listed in historical
order and compared in terms of accuracy and computational efficiency
Fisheye multi-camera system calibration for surveying narrow and complex architectures
Narrow spaces and passages are not a rare encounter in cultural heritage, the shape and extension of those areas place a serious challenge on any techniques one may choose to survey their 3D geometry. Especially on techniques that make use of stationary instrumentation like terrestrial laser scanning. The ratio between space extension and cross section width of many corridors and staircases can easily lead to distortions/drift of the 3D reconstruction because of the problem of propagation of uncertainty. This paper investigates the use of fisheye photogrammetry to produce the 3D reconstruction of such spaces and presents some tests to contain the degree of freedom of the photogrammetric network, thereby containing the drift of long data set as well. The idea is that of employing a multi-camera system composed of several fisheye cameras and to implement distances and relative orientation constraints, as well as the pre-calibration of the internal parameters for each camera, within the bundle adjustment. For the beginning of this investigation, we used the NCTech iSTAR panoramic camera as a rigid multi-camera system. The case study of the Amedeo Spire of the Milan Cathedral, that encloses a spiral staircase, is the stage for all the tests. Comparisons have been made between the results obtained with the multicamera configuration, the auto-stitched equirectangular images and a data set obtained with a monocular fisheye configuration using a full frame DSLR. Results show improved accuracy, down to millimetres, using a rigidly constrained multi-camera
- …