1047-3203/$ see front matter 2011 Elsevier Inc. A doi:10.1016/j.jvcir.2011.09.009 ⇑ Corresponding author. Fax: +1 780 492 1811. E-mail addresses: [email protected] (M. Singh), [email protected] (A. Basu), [email protected], Mandal). In applications such as super-resolution imaging and mosaicking, multiple video sequences are registered to reconstruct video with enhanced resolution. However, no...

Power spectral analysis of a signal is nothing but analyzing the signal power as a function of frequency components in the signal. Periodogram, the fundamental power spectral estimation technique has the limitation that it is not a consistent estimate, but good at frequency resolution. Hence a number of modifications have been suggested in literature like Bartlett and Welch etc., to improve the...

This note is a rough summary of the super resolution methods that I recently learned. To begin with, what’s the definition of super resolution? Super Resolution (SR) is a class of techniques that enhance the resolution of an image. For example, given a 256 × 256 image as input, the output of a SR process is a corresponding 512× 512 image. Notice that super resolution is a highly ill-posed probl...

The contrast and resolution have trade-off in medical ultrasound imaging. Most of adaptive beamformer can enhance the imaging resolution significantly but not improve the contrast at the same time. The principal component analysis (PCA) based beamformers such as the eigenspace-based minimum variance (ESBMV) beamformer provide a good imaging resolution. Neighbors of the focal point include the c...

In scanning microscopy by total internal reflection with thermal lens spectroscopy, its spatial resolution depends on the distance between the sample and a converging lens, which corresponds to the objective lens in an ordinary optical microscope. It was found that the resolution was best when the signal induced by the thermal lens effect was maximum. The distance was precisely adjusted by moni...

In this letter we propose a novel method to unambiguously estimate the phase-difference of a single-frequency signal measured between a pair of spatially separated sensors. First, we mathematically prove that, in a noiseless system, the phase between a pair of spatially separated sensors with inter-sensor spacing exceeding half wavelength (λ2 ) of the signal of interest, can unambiguously be es...

High-resolution, high-signal-to-noise (〈S/N〉 = 85) spectra have been obtained for five stars – CD–2417504, CD–38245, CS 22172–002, CS 22885–096, and CS 22949–037 – having [Fe/H] . –3.5 according to previous lower S/N material. LTE model-atmosphere techniques are used to determine [Fe/H] and relative abundances, or their limits, for some 18 elements, and to constrain more tightly the early enric...

Liquid Crystal Displays (LCDs) have improved so dramatically over the past years, that they have rapidly overtaken the TV market. At the moment, one major aspect where LCDs are still inferior to the traditional Cathode Ray Tube (CRT), is the resolution of moving images, i.e. dynamic resolution. In this paper, we review some of the proposed methods to improve this aspect, from a video signal pro...

The problem to track time-varying properties of a signal is studied. The somewhat contradictory notion of \time-varying spectrum" and how to estimate the \current" spectrum in an on-line fashion is discussed. The traditional concepts and relations between time-and frequency resolution are crucial for this problem. As adaptive estimation algorithm is used to estimate the parameters of a time-var...

Aims. We develop and validate tools for estimating residual noise covariance in Planck frequency maps, we also quantify signal error effects and compare different techniques to produce low-resolution maps. Methods. We derived analytical estimates of covariance of the residual noise contained in low-resolution maps produced using a number of mapmaking approaches. We tested these analytical predi...