In this paper it is shown how estimates of local structure and orientation can be obtained using a set of spherically separable quadrature lters. The method is applicable to signals of any dimensionality the only requirement being that the lter set spans the corresponding orientation space. The estimates produced are 2:nd order tensors, the size of the tensors corresponding to the dimensionalit...

We present the results of a systematic search in 8.5 years of Rossi X-ray Timing Explorer All-Sky Monitor data for evidence of periodicities. The search was conducted by application of the Lomb-Scargle periodogram to the light curves of each of 458 actually or potentially detected sources in each of four energy bands (1.5–3 keV, 3-5 keV, 5-12 keV, and 1.5–12 keV). A whitening technique was appl...

UNLABELLED This article will outline how combining existing techniques in a new and unique manner can potentially redefine the traditional approach to smile design planning and execution. Alignment, tooth whitening and edge bonding with new highly polishable nano-hybrid composites can make cosmetic dentistry far simpler and less invasive. Patients' perceptions of their end smile result can chan...

Flow cytometry is a rapid method for measuring the optical properties of individual cells. The technique has found great utility in the study of mammalian cells, but microbiological applications have been more limited. We here show that UV-excited fluorescent whitening agents, in particular Tinopal CBS-X, are effective stains for both vegetative microbial cells and for spores of Gram-positive b...

We examine the use of a blind adaptive “pre-whitening” filter to precede an equalizer adapted by the constant modulus algorithm (CMA). The idea is based on results presented in which the use of a (fixed, or non-adaptive) pre-whitening filter provides an isometry (i.e. geometry preserving transformation) between the combined channel-equalizer (or global space) and the equalizer tap space. As muc...

In this paper, we describe methods for computing fractionally spaced blind equalizers directly from second-order statistics of the observations. The equalizers with all possible delays are computed simultaneously, and the one with the best delay is picked by a blind constant modulus index. Our algorithm utilizes the equalizer output whitening property of the blind equalizers, i.e., output white...

Twofish is a 128-bit block cipher submitted as an AES candidate [SKW+98]. Mirza and Murphy [MM99] recently noted two interesting properties in the Twofish key schedule for 128-bit keys: there is a non-uniform distribution of 128-bit whitening keys, and the 64-bit round subkeys are non-uniformly distributed over each subset of keys that fixes the S-boxes. This paper extends these results and exp...

Joint diagonalization for ICA is often performed on the orthogonal group after a pre-whitening step. Here we assume that we only want to extract a few sources after pre-whitening, and hence work on the Stiefel manifold of p-frames in R. The resulting method does not only use second-order statistics to estimate the dimension reduction and is therefore denoted as soft dimension reduction. We empl...

In the study of biological systems, it is often desirable to investigate causality between two simultaneously recorded signals. This paper suggests applying whitening filters to the signals and estimating their cross-correlation. The Cross-correlation sequence can be used to detect time lag between the signals. A positive lag can be interpreted as the reference signal causing the delayed signal...