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The theory of compressed sensing shows that sparse signals in high-dimensional spaces can be recovered from a relatively small number of samples in the form of random projections. However, in severely resource-constrained settings even CS techniques may fail, and thus, a less aggressive goal of partial signal recovery is reasonable. This paper describes a simple data-adaptive procedure that efficiently...
Active imaging polarimetry for remote sensing applications has received significant attention recently. Such systems use a variably-polarized active light source to illuminate target objects. Multiple images with different polarizations are then captured and used to build Stokes vectors which are, in turn, used to estimate the refraction indices of materials as well as the relative geometry of the...
We propose an improved wavelet-based embedded image coding scheme using dynamic index reordering vector quantization. The successive approximation process in embedded image coding is defined as a temporal process, and dynamic index reordering vector quantization is applied to the temporal domain. In this method, the redundancy in consecutive angle or pattern transition is exploited. An efficient encoding...
The problem of demodulating multiple frequency modulated signals that overlap spectrally is seen to pervade communication systems both military and civilian, where bandwidth is a precious resource. In this paper, we extend the use of the recently developed multiangle discrete fractional Fourier transform (MA-CDFRFT) for the purposes of cochannel FM demodulation and also investigate its use for the...
This work addresses the problem of estimating the number of signal sources in convolutive signal mixtures. Our approach is based on the blind source separation. The first step builds a measure of the global activity of all active sources. This measure is known as activity index, and is based on the inverse of correlation matrix of the observed signals. The next step analyses the activity index variance...
Several studies have shown that emphasis of speech transients can improve the intelligibility of speech in noise. However, each study used a different method to define speech transients, and comparisons across methods are difficult. This paper introduces an index to quantify the transient nature of speech (specifically, the extent to which the onsets and offsets of formants are emphasized compared...
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