Robustly measuring subtle longitudinal brain changes is a major challenge in computational neuroanatomy. This paper describes a method for measuring temporal morphological brain changes, by means of a 4-dimensional image warping mechanism. Longitudinal stability is achieved by considering all temporal MR images of an individual simultaneously, rather than by individually warping a template to a...

The constant image brightness (CIB) assumption assumes that the intensities of corresponding points in two images are equal. This assumption is central to much of computer vision. However, surprisingly little work has been performed to support this assumption, despite the fact the many of algorithms are very sensitive to deviations from CIB. Deviations from the CIB model have usually been model...

Portable digital devices such as PDAs and camera phones are the easiest most widely used methods to preserve collect information. Capturing a document image using this method always has warping issues, especially when capturing pages from book rolled-up documents. In article, we propose an effective correct of captured image. The proposed uses checkerboard calibration pattern calculate world po...

Given two images f1 , f2 representing the same object, we want to identify geometric correspondences between homologous features in both images. Specifically, we want to find a correspondence function (also called deformation function or deformation field) g(x1)=x2 , where x1 ,x2 are matching coordinates in images f1 , f2 . Here, we intend to concentrate on a non-linear registration (also calle...

The task of image recognition is very challenging due to many intra-class variations. Especially the example of face recognition offers many challenges such as illumination, facial expressions, occlusions or different poses. Many different approaches have been proposed such as analyzing the sub-space spanned by face images, feature matching or three-dimensional models. However the approach of t...

Full waveform inversion (FWI) can generate high-resolution subsurface models, but often suffers from an objective function with local minima caused mainly by an absence of low frequencies in seismograms. These local minima cause cycle skipping when the initial model for FWI is far from the true model. To avoid cycle skipping, traveltime inversion is often used to compute initial models for FWI....

We describe an approach for rendering large terrains in real-time. A digital elevation map defines the rough shape of the terrain. During rendering, procedural geometric and texture detail is added by the graphics hardware. We show, how quad meshes can be generated quickly that have a locally varying resolution that is optimized for the inclusion of procedural detail. We obtain these distorted ...

Time-lapse seismic data are widely used for monitoring subsurface changes. A quantitative assessment of how reservoir properties have changed allows for better interpretation of fluid substitution and migration during processes like oil and gas production, and carbon sequestration. Full waveform inversion has been proposed as a way to retrieve quantitative estimates of subsurface properties thr...

We address the problem of representing captured images in the continuous mathematical space more usually associated with certain forms of drawn (’vector’) images. Such an image is resolution-independent so can be used as a master for varying resolution-specific formats. We briefly describe the main features of a vectorising codec for photographic images, whose significance is that drawing progr...

In Direct Metal Laser Sintering objects are created by sequential sintering loose metal powder particles by means of laser technology. When the laser sintering process involves temperature gradients, thermal stresses develop. Corresponding residual stresses induce warping of the densified structure leading to unacceptable tolerance losses. This paper examines the role of laser beam scan pattern...