Decorrelation is one of the main limitations for InSAR. Masking decorrelated pixels crucial retrieving information from SAR interferograms. However, traditional masking methods, manually drawing masks time-consuming and may be unfeasible when decorrelation areas are with complicated blurred boundaries. Setting a single coherence threshold also difficult, if not impossible, to mask out all witho...

this research project is a field study to investigate the complications of general anaesthesia with mask in patients under surgery in a hospital affiliated to university of medical sciences iran. the specific goals of this study are as follows:   -to determine some of the characters of patients under study.   -to determine the complications of general anesthesia with mask during surgery in one ...

Wavelet-based transform coding is well known for its utility in perceptual image compression. Psychovisual modeling has lead to a variety of perceptual quantization schemes, for efficient at-threshold compression. Successfully extending these models to supra-threshold compression, however, is a more difficult task. This work attempts to bridge the gap between at threshold modeling and supra-thr...

Characterization of the visual system as a linear system has many consequences. One property implied by such a characterization is that signal-to-noise ratio at threshold is constant, so that the contrast energy of a sinusoidal grating at threshold depends on the effective noise passed by the filter used to detect the target. When the contrast energy in an external noise is sufficiently high, t...

When performance is limited by stochastically defined masks, (psychophysical) reverse correlation has proven to be an especially efficient tool for estimating the templates used by detection and discrimination mechanisms. Here I describe a maximum-likelihood approach to quantifying the significance of differences between estimates of template. Four methodologically related experiments illustrat...

Localization of radioactive hot spots is nowadays a major issue for Homeland Security to avoid illegal transit of radiological material or manage post-accidental events. In this context, CEA LIST Institute designed a new gamma camera, called GAMPIX, based on the association of a semiconductor detector with a coded mask. GAMPIX is currently under industrialization by AREVA CANBERRA under the nam...

The attentional blink (AB) refers to the finding that observers often miss the second of two masked visual targets (T1 and T2, e.g., letters) appearing within 200-500 ms. Although the presence of a T1 mask is thought to be required for this effect, we recently found that an AB deficit can be observed even in the absence of a T1 mask if T2 is shown very briefly and followed by a pattern mask (M....

Cloud detection is a source of significant errors in retrieval of sea surface temperature (SST). We apply a Bayesian cloud detection scheme to 37 years of Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC) data, which is an important source of multi-decadal global SST information. The Bayesian scheme calculates a probability of clear-sky for each image pixel, conditiona...

This paper proposes a novel method for document enhancement. The method is based on the combination of two state-of-the-art filters through the construction of a mask. The mask is applied to a TV (Total Variation) regularized image where background noise has been reduced. The masked image is then filtered by NLmeans (Non Local Means) which reduces the noise in the text areas located by the mask...

In recent years, speech enhancement by analysis-resynthesis has emerged as an alternative to conventional noise filtering approaches. Analysis-resynthesis replaces noisy speech with a signal that has been reconstructed from a clean speech model. It can deliver high-quality signals with no residual noise, but at the expense of losing information from the original signal that is not well-represen...