BACKGROUND Teenagers with allergies are at particular risk of severe and fatal reactions, but epinephrine auto-injectors are not always carried as prescribed. We investigated barriers to carriage. METHODS Patients aged 12-18 years old under a specialist allergy clinic, who had previously been prescribed an auto-injector were invited to participate. Semi-structured interviews explored the fact...

In this work, the normalized time auto-correlation function of the electric field of the light g (τ ) that is scattered by the two kinds of particles in dispersion is investigated. The results show that the logarithm of g (τ) can be consistent with a line and many reasons can cause the deviations between an exponentiality and plots of g (τ ) as a function of delay time τ . The nonexponentiality...

A two-point orientation auto-correlation function (TP-OACF) was developed in order to quantify the spatial distribution of targeted texture components. An example of a TP-OACF was demonstrated using an idealized orientation map. Characteristics of the spatial distribution of major texture components in 6022-T4 Al sheets deformed in plane-strain tension were also quantified using a TP-OACF. The ...

0167-8655/$ see front matter 2012 Elsevier B.V. A http://dx.doi.org/10.1016/j.patrec.2012.01.007 ⇑ Corresponding author. Tel.: +81 29 861 5491; fax E-mail addresses: [email protected] (T. (N. Otsu). In this paper, we propose a motion recognition scheme based on a novel method of motion feature extraction. The feature extraction method utilizes auto-correlations of space–time gradients...

Autocorrelation and cross-correlation have been defined and utilized in signal and image processing for many years, but not for color or vector images. In this poster we present for the first time a definition of correlation applicable to color images, based on quaternions or hypercomplex numbers. We have devised a visualization of the result using the polar form of a quaternion in which color ...

We describe the algorithms employed by WAX, a spatial autocorrelation application written in C and C++ which allows for both rapid grouping of multi-epoch apparitions as well as customizable statistical analysis of generated groups. The grouping algorithm, dubbed the swiss cheese algorithm, is designed to handle diverse input databases ranging from the 2MASS working point source database (an al...

Large sets of matrices with good auto and cross-correlation are rare. We present two such constructions, and a method of extending them, by a simple process of interlacing arrays from a well prepared family of arrays with good autocorrelation and with good cross-correlation between any two arrays in the family. These matrices can be applied to digital watermarking of images.

Wässle and colleagues first observed that the local structure of cell mosaics was approximately hexagonal1, as the histogram of the angular difference of all neighbors to a reference cell within some distance showed a mode at 60deg. Their analysis was based on the location of the cell bodies (not the receptive fields). However, the same conclusion holds true if one uses the actual centers of th...

Fisher’s linear discriminant analysis (FLDA) has been attracting many researchers and practitioners for several decades thanks to its ease of use and low computational cost. However, FLDA implicitly assumes that all the classes share the same covariance: which implies that FLDA might fail when thhis assumption is not necessarily satisfied. To overcome this problem, we propose a simple extension...