Application of Wavelets to Color Spectra

In this paper, Daubechies orthogonal wavelets are used to compress color spectra. Color spectra have many forms from sharp peaks to constant value. Compression is needed to save space in storing and bandwidth in transmission of spectra. The underlying idea of this paper is to find suitable wavelets for compression. Quality of compression and reconstruction is measured with color difference \DeltaE* from CIELUV-color space. Good reconstruction is needed because of sensitive human color vision

Wavelet Compression of Multispectral Images

Image compression has been one of the mainstream research topics in image processing. The compression methods are usually developed for images visible to humans, i.e. for gray-scale or RGB images. Recent advances in the field of remote sensing, however, require us to compress multispectral images. Many methods used in the traditional lossy image compression can be reused also in the compression of multispectral images. In this paper, multidimensional wavelet based transforms are used for the compression. The original three-dimensional image is compressed using one-,twoand three-dimensional wavelets. Furthermore, some quantitative quality measures for multispectral images are presented. Keywords : multispectral image, image compression, wavelet transform 1 INTRODUCTION Multispectral images require large amounts of disk space if they are represented in a raw form, and therefore a lot of attention has recently been focused to compress these images. Some applications, like medical image..

Optimal shape design and unilateral boundary value problems. I.

In the first part we give a general existence theorem and a regularization method for an optimal control problem where the control is a domain in R″ and where the system is governed by a state relation which includes differential equations as well as inequalities. In the second part applications for optimal shape design problems governed by the Dirichlet‐Signorini boundary value problem are presented. Several numerical examples are included.peerReviewe

Optimal shape design and unilateral boundary value problems. Part II.

The shape optimization of an elastic body in contact with a rigid surface is considered. An existence result for optimal shapes as well as a numerical realization are stated. From several numerical results it can be seen that minimizing the total potential energy of the system leads to an even distribution of contact forces on the contact boundary, even in the cases when the contact involves friction.peerReviewe

A versatile model-based visibility measure for geometric primitives

Ellenrieder M, Krüger L, Stößel D, Hanheide M. A versatile model-based visibility measure for geometric primitives. In: Kalviainen H, Parkkinen J, Kaarna A, eds. 14th Scandinavian Conference, SCIA 2005, Joensuu, Finland, June 19-22, 2005. Proceedings. Lecture Notes in Computer Science, 3540. Berlin: Springer-Verlag; 2005: 669-678.In this paper, we introduce a novel model-based visibility measure for geometric primitives called visibility map. It is simple to calculate, memory efficient, accurate for viewpoints outside the convex hull of the object and versatile in terms of possible applications. Several useful properties of visibility maps that show their superiority to existing visibility measures are derived. Various example applications from the automotive industry where the presented measure is used successfully conclude the paper