in this paper, an optimal algorithm is presented for de-noising of medical images. the presented algorithm is based on improved version of local pixels grouping and principal component analysis. in local pixels grouping algorithm, blocks matching based on l2 norm method is utilized, which leads to matching performance improvement. to evaluate the performance of our proposed algorithm, peak sign...

In this paper, we propose a statistical methodology to test whether the texture of an image is isotropic or not. This methodology is based on the well-known quadratic variations defined as averages of square image increments. Specific to our approach, these variations are computed in different directions using grid-preserving image rotations. We study asymptotically these variations in a framew...

This paper presents a newmethod for robust online variability extraction in time series. The proposed estimator is simultaneously highly robust and efficient.We derive its breakdown point, influence function, and asymptotic variance and study the finite sample properties in a simulation study. © 2009 Elsevier B.V. All rights reserved.

Two selection statistics are used to extract new candidate periodic variables from the epoch photometry of the Hipparcos catalogue. The primary selection criterion is a signal to noise ratio. The dependence of this statistic on the number of observations is calibrated using about 30 000 randomly permuted Hipparcos datasets. A significance level of 0.1% is used to extract a first batch of candid...

The paper by Dan Andrews and Marion Kohler provides an interesting and very useful contribution to the empirical literature that seeks to explain the factors infl uencing bilateral output correlations. While there are a number of papers that have developed empirical models of the cross-section distribution of bilateral (de-trended) output correlations (Baxter and Kouparitsas 2005, Imbs 2004 and...

Analyzing N&B using AVI movies I converted the AVI movie (a collection of bitmaps) to a format that SimFCS can read. This is done reading the movie using ImageJ and then saving the file as raw data. The raw data shows that the movie is 150x150 pixels and contains 900 frames. I read the raw data using the following screen and analyze a part of it in the 128x128 format. There is a fast initial bl...