The Geoeye-1 satellite, launched in September 2008, is able to acquire imagery in panchromatic mode, with a spatial resolution of 0.41 m at nadir, offering the most powerful way to obtain detailed imagery actually commercially available. The aim of the work is to evaluate the quality of the GeoEye-1 products through radiometric and geometric analysis; the area test is the city of Rome. Radiomet...

bstract. The capacity of a printing system to accurately reproduce etails has an impact on the quality of printed images. The ability of system to reproduce details is captured in its modulation transfer unction (MTF). In the first part of this work, we compare three exsting methods to measure the MTF of a printing system. After a horough investigation, we select the method from Jang and Alleac...

Preliminary experiments have shown that the quality of printed images depends on the capacity of the printing system to accurately reproduce details. We propose to improve the quality of printed images by compensating for the Modulation Transfer Function (MTF) of the printing system. The MTF of the printing system is measured using the method proposed by Jang and Allebach, in which test pages c...

Monte Carlo simulations of an atmospheric phase screen, based on a Kolmogorov spectrum of phase fluctuations, were performed. Speckle patterns produced from the phase screens were used to derive statistical properties of power spectra and bispectra of speckle interferograms. We present the bispectral modulation transfer function and its signal-to-noise ratio at high light levels. The results co...

In this paper we propose a topology for continuous time Σ∆ modulators. Unlike the modulators presented until now, they exhibit no peaking in their signal transfer function. Instead it achieves a ‘flat’ STF with the desired anti-aliasing properties and with small internal nodes signal levels. Now, a simple filter, e.g. a first-order low-pass filter can precede the modulator to prevent out of ban...