The paper presents a novel despeckling method, based on Daubechies complex wavelet transform, for medical ultrasound images. Daubechies complex wavelet transform is used due to its approximate shift invariance property and extra information in imaginary plane of complex wavelet domain when compared to real wavelet domain. A wavelet shrinkage factor has been derived to estimate the noise-free wa...

The effect of noise variations on two of the short period seismic discriminants, spectral ratio and log-likelihood ratio is studied. The mean square errors of two different estimators of these two discriminants are evaluated and some theoretical and experimental results for two seismic signals in seismic noise are presented. Accepted for the Air Force Joseph R. Waterman, Lt. Col., USAF Chief, L...

In this article, we tackle for the first time problem of dynamic memory-efficient Searchable Symmetric Encryption (SSE). term “memory-efficient” SSE, encompass both goals local and page-efficient SSE. The centerpiece our approach is a novel connection between those two goals. We introduce map, called Generic Local Transform, which takes as input SSE scheme with certain special features, outputs...

The multiplication of polynomials is a primitive widely used in computer algebra. It appears to contribute to a large panel of mathematical functions. Consequently, the optimization of this primitive is critical in cryptography for instance. Fast Fourier Transform (FFT) is commonly used in order to multiply polynomials. This is why an improvement of the Fast Fourier Transform algorithm is impor...

A robust method is proposed in this paper to retrieve digital images using combination of color, texture and shape features. The proposed method consists of three stages. Shape detection is done based on TopHat transform to detect and crop object part of the image in the first stage. The second is included a texture feature extraction algorithm using color local binary patterns (CLBP) and local...

A change detection approach for SAR images based on contourlet image fusion and fuzzy clustering .In this method difference image is generated from log ratio and mean ratio images by image fusion technique. In order to restrain the background information and enhance the information of changed regions in the fused difference image, wavelet fusion rules and contourlet fusion rules based on an ave...

The paper presents texture classification using multichannel filters: Gabor filters and discrete wavelet transform. We have used a bank of 8 Gabor filters 2 wavelet filters: Daubeschies and Haar, for analyzing and classifying the textures in SAR images. The parameters of the Gabor filter bank are obtained using the energy measure of the response to the filters. The Fuzzy C-means classifier has ...

The personal identification approaches using iris images are receiving increasing attention in the biometrics literature. Several methods have been presented in the literature and those based on the phase encoding of texture information are suggested to be the most promising. However, there has not been any attempt to combine these approaches to achieve further improvement in the performance. T...

We present an algorithm for evaluating a linear “intersection transform” of a function defined on the lattice of subsets of an n-element set. In particular, the algorithm constructs an arithmetic circuit for evaluating the transform in “down-closure time” relative to the support of the function and the evaluation domain. As an application, we develop an algorithm that, given as input a digraph ...