This paper presents a histogram based image retrieval system for environments where the images may be subject to gamma correction. The images are transformed into representations that are invariant under gamma correction. The differential invariant employed is a local feature implemented with derivatives of the Gaussian. The image retrieval is based on feature histograms computed from the invar...

In this paper we propose a new edge detector based on anisotropic linear filtering, local maximization and gamma correction. The novelty of this approach resides in the mixing of ideas coming both from directional recursive linear filtering and gamma correction. A peculiarity of our anisotropic edge detector is that it is based on the use of two elongated and oriented filters in two different d...

Background: Measurement of absolute or differential renal function using radiotracers plays an important role in the clinical management of various renal diseases. Gamma camera quantitative methods in approximation of renal clearance may potentially be as accurate as plasma clearance methods. However some critical factors such as kidney depth and background counts are still troublesome in...

background: measurement of absolute or differential renal function using radiotracers plays an important role in the clinical management of various renal diseases. gamma camera quantitative methods in approximation of renal clearance may potentially be as accurate as plasma clearance methods. however some critical factors such as kidney depth and background counts are still troublesome in the u...

A survey of methods for in-situ measurements of gamma radioactivity in soil is done. Mathematical models for depth distribution of gamma radioactivity in soil are given.

The existence of antimatter domains in baryon asymmetrical Universe can appear as the cosmological consequence of particle theory in inflationary models with non-homogeneous baryosynthesis. Such a domain can survive in the early Universe and form globular cluster of antimatter stars in our Galaxy. The model of antimatter pollution of Galaxy and annihilation with matter gas is developed. The pro...

Parisian options are barrier options for which the knock-in/knock-out feature is only activated after the price process has spent a certain prescribed, consecutive time beyond the barrier. This specification has two motivations: First, there is the need to make the option more robust against short-term movements of the share price. This is achieved in Parisian options where it is ensured that a...

We improve several results recently established by Dragomir et al. in (2000) for the Gamma and Beta functions. All we need is some clever applications of classical inequalities.

This paper considers the problem of delivering calibrated images over the web with the precision appropriate for psychophysical experimentation. We are interested only in methods that might be employed by a remote participant possessing nothing other than a computer terminal. Therefore, we consider only purely psychophysical methods not requiring any measurement instruments or standards. Becaus...