In this paper we present a novel and efficient depth-image representation and warping technique called DMesh which is based on a piece-wise linear approximation of the depth-image as a textured and simplified triangle mesh. We describe the application of a hierarchical multiresolution triangulation method to generate adaptively triangulated depth-meshes efficiently from reference depth-images, ...

The use of digital watermarking in real applications is impeded by the weakness of current available algorithms against signal processing manipulations leading to the de-synchronization of the watermark embedder and detector. For this reason, the problem of watermarking under geometric attacks has received considerable attention throughout recent years. Despite their importance, only few classe...

Many problems in medical imaging are stated in terms of parameter estimation. Given a proper parametric function local or global optimization procedures are applied to compute the best t between the chosen model and observed measurements. The mathematical for-malization of the tackled problem decides on the success of the nal algorithm. We introduce a framework for practitioners which is useful...

Systems that provide remote viewing of three-dimensional data with interactive viewpoint control must confront two key problems: latency and bandwidth. The straightforward approach of transmitting and displaying rendered images results in a delay of one round-trip between viewpoint change and the corresponding change in the displayed image. We avoid this delay by transmitting a representation o...

Libraries and other institutions are interested in providing access to scanned versions of their large collections of handwritten historical manuscripts on electronic media. Convenient access to a collection requires an index, which is manually created at great labour and expense. Since current handwriting recognizers do not perform well on historical documents, a technique called word spotting...

This paper proposes an indexing technique for fast retrieval of similar image subsequences using the multi-dimensional time warping distance. The time warping distance is a more suitable similarity measure as compared to the Lp distance in many applications where sequences may be of different lengths and/or different sampling rates. Our indexing scheme employs a disk-based suffix tree as an ind...

The problem of inferring a missing face image which is at much higher resolution from lower observations is called as Face Super Resolution or Hallucination problem. Mostly the problem is approached in spatial domain by using the aligned textural information of the observation. However the ignorance of the shape information limits the performance of these approaches. In Resolution Aware Fitting...

In this paper, we present a method for the analysis and synthesis of faces that combines image-based rendering with geometry-based warping. In contrast to conventional model-based coding systems that usually rely on textured 3-D triangle mesh models for the representation of human heads, we additionally incorporate a large number of past images in order to interpolate new views. The use of real...

Image stitching techniques produce an image with wide field-of-view by aligning multiple images with narrow field-of-view. While conventional algorithms successfully stitch images with small parallax, structure misalignment may occur when input images contain large parallax. This paper presents an image stitching algorithm which aligns images with large parallax by regional linear warping. To t...

We analyze the usage of matching algorithms for image recognition. We focus on the approaches which aim at finding nonlinear deformations of an entire image. ZeroOrder Warping (ZOW), Pseudo 2D Hidden Markov Model (P2DHMM) and Tree-Serial Dynamic Programming (TSDP) are studied. The effects of different constraints and parameter settings are analyzed. Furthermore, a new version of the TSDP and ex...