A successful class of texture analysis methods is based on multiresolution decompositions. Especially Gabor lters have extensively been used [1] [2] [3] [4] [5] [6]. More recently, decompositions with pyramidal and tree structured wavelet transforms have been proposed [7] [8] [9] [10]. An important aspect is the rotation invariance of the features. A discrete wavelet transform does not provide ...

Although electronic speech synthesis by now has a tradition of several decades, there is still no agreement on the most preferable structure for a speech synthesizer. In this paper we will compare several structures that have been used by workers in the field. As these all appear to have some drawbacks, we will propose an alternative structure that should solve at least some of the problems. Th...

Detailed log facies studies of Miocene succession in the well Rashidpur-04, Rashidpur structure, Surma Basin were carried out by integrating wireline log and limited core sample data in order to reconstruct the paleoenvironments of deposition. Based on the analysis of the log motifs, grain size, sand/shale ratio and major change in gamma ray log motifs, two major depositional sequences were ide...

Given an arbitrary matrix $A\in\mathbb{R}^{m\times n}$, we consider the fundamental problem of computing $Ax$ for any $x\in\mathbb{R}^n$ such that is $s$-sparse. While fast algorithms exist particular choices $A$, as discrete Fourier transform, there are hardly approaches beat standard matrix-vector multiplication realistic dimensions without structural assumptions. In this paper, devise a rand...

Concentration ratios (CR(wo-media)) are used in most radioecological models to predict whole-body radionuclide activity concentrations in wildlife from those in environmental media. This simplistic approach amalgamates the various factors influencing transfer within a single generic value and, as a result, comparisons of model predictions with site-specific measurements can vary by orders of ma...

This paper proposes a new approach for digital watermarking and secure copyright protection of videos, the principal aim being to discourage illicit copying and distribution of copyrighted material. The method presented here is based on the discrete Fourier transform (DFT) of three dimensional chunks of video scene, in contrast with previous works on video watermarking where each video frame wa...

The largest common subtree problem is to nd a largest tree which occurs as a common subgraph in a given collection of trees. Let n denote the number of vertices in the largest tree in the collection. We show that in the case of bounded degree trees, it is possible to achieve an approximation ratio of O(n(log logn)= log n). For unbounded degree trees, we give an algorithm with approximation rati...

In this paper, we propose a new signal processing technique, “specmurt anasylis,” that provides piano-rolllike visual display of multi-tone signals (e.g., polyphonic music). Specmurt is defined as inverse Fourier transform of linear spectrum with logarithmic frequency, unlike familiar cepstrum defined as inverse Fourier transform of logarithmic spectrum with linear frequency. We apply this tech...

Nonstationary processes in seismic modeling may be represented numerically by Gabor multipliers and generalized frame operators. These numerical algorithms are based on a localized version of the Fourier transform and share many of the speed and accuracy benefits of the FFT, while modeling nonstationarity. We demonstrate applications to seismic deconvolution and numerical wavefield propagation,...