Abstract. While displacement maps can provide a rich set of visual detail on otherwise simple surfaces they have always been very expensive to render. Rendering has only been done using ray tracing or by introducing a great number of micro-polygons. We present a new image-based approach by showing that rendering displacement maps is sufficiently similar to image warping and introduce a new warp...

In this paper our system for face and facial feature tracking using an active model is described. The focus of the paper is on image warping methods for achieving realtime performance, in order to show that it is possible to implement a real-time model based coding system on consumer hardware.

When images captured by a tilted camera are mosaiced into a panorama, the resulting mosaic is curled. This happens, for example, with a panning camera that is not perfectly horizontal, and with a translating camera facing a tilted planar surface. The tilt of the camera causes differences in image velocity between the top and bottom parts of the image, causing the curled mosaic. In rectified mos...

In this paper we present a novel approach for interactive rendering of virtual views from real image sequences. Combining the concepts of light fields, depth-compensated image warping and view dependent texture mapping, this plenoptic modeling approach can handle large and complex scenes. A portable, handheld multi-camera system has been developed that allows to record multiple image streams by...

Image warping plays an extremely important role in face matching and recognition and therefore has wide applications and great significance in computer vision, biomedical imaging and homeland security. One popular warping algorithm developed by Alex Rosen, known as AlexWarp has the drawback that it only allows one pair of landmarks being specified at one time. The consequence of this is that th...

1524-0703/$ see front matter 2010 Elsevier Inc doi:10.1016/j.gmod.2010.11.001 ⇑ Corresponding author. Fax: +55 21 25295067. E-mail addresses: [email protected] (T. Pereira), Brazil), [email protected] (I. Macêdo), smcosta@ucalg [email protected] (L.H. de Figueiredo), [email protected] (L While current image deformation methods are careful in making the new geometry seem right, little attention has been given...

Grid-distortion is an image warping technique which is driven by the mapping between equivalent families of curves, arranged in a grid structure. Until recently only curves sets arranged in a regular rectangular grid were considered. In the present work we construct a smooth (C 1) grid-distortion mappings deened by curves arranged in a non-regular structure , and fully characterize the most gen...

In this paper, we discuss a geometrical model of a space of deformable images or shapes, in which infinitesimal variations are combinations of elastic deformations (warping) and of photometric variations. Geodesics in this space are related to velocity-based image warping methods, which have proved to yield efficient and robust estimations of diffeomorphisms in the case of large deformation. He...

A new approach to Bayesian reconstruction is introduced in which the prior probability distribution is endowed with an inherent geometrical flexibility. This flexibility is achieved through a warping of the coordinate system of the prior distribution into that of the reconstruction. This warping allows various degrees of mismatch between the assumed prior distribution and the actual distributio...