Multidimensional Systems and Signal Processing
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Fast DOA estimation of incoherently distributed sources by novel propagator
Multidimensional Systems and Signal Processing - Tập 24 - Trang 573-581 - 2012
A low-complexity algorithm is presented for the estimation of the nominal direction-of-arrivals (DOAs) of incoherently distributed (ID) sources. The presented algorithm estimates the nominal DOAs of ID sources by a novel propagator method which makes use of the approximate rotational invariance relationship between two closely spaced identical uniform linear arrays. Without any search and the eige...... hiện toàn bộ
A perceptual metric for stereoscopic image quality assessment based on the binocular energy
Multidimensional Systems and Signal Processing - Tập 24 - Trang 281-316 - 2012
Stereoscopic imaging is becoming very popular and its deployment by means of photography, television, cinema. . .is rapidly increasing. Obviously, the access to this type of images imposes the use of compression and transmission that may generate artifacts of different natures. Consequently, it is important to have appropriate tools to measure the quality of stereoscopic content. Several studies t...... hiện toàn bộ
Fast motion and disparity estimation for HEVC based 3D video coding
Multidimensional Systems and Signal Processing - Tập 27 - Trang 743-761 - 2014
The emerging international standard for high efficiency video coding (HEVC) based 3D video coding (3D-HEVC) is an extension of HEVC. In the test model of 3D-HEVC, variable size motion estimation (ME) and disparity estimation (DE) are both employed to select the best coding mode for each treeblock in the encoding process. This technique achieves the highest possible coding efficiency, but it brings...... hiện toàn bộ
Secure data hiding by fruit fly optimization improved hybridized seeker algorithm
Multidimensional Systems and Signal Processing - Tập 32 - Trang 405-430 - 2020
The recent growth of World Wide Web (WWW) and development of the next-generation internet facilitates a huge amount of data being conveniently transmitted via wireless networks. The sensitive information transmitted is potentially vulnerable in the communication channel like wireless networks. Unauthorized users could potentially intercept and negatively exploit the true intent of the information ...... hiện toàn bộ
Construction of a Morlet Wavelet Power Spectrum
Multidimensional Systems and Signal Processing - Tập 13 - Trang 101-111 - 2002
The Morlet wavelets transform (MWT) is an efficient means of detecting and analyzing transient signals. However, ordinary iterative processes that calculate the MWT are time-consuming. In addition, when the MWT is applied to construct a wavelet power spectrum on a linear frequency axis, the peak response appears at a value lower than the actual signal frequency. In this work, formulae that produce...... hiện toàn bộ
Closed-form multiple invariance ESPRIT
Multidimensional Systems and Signal Processing - Tập 18 - Trang 47-54 - 2007
The multi-least-squares fitting and regularization formulations of the Estimation of Signal Parameters via Rotational Invariance Techniques (ESPRIT) problem are herein presented to provide a new framework for developing the closed-form multiple invariance ESPRIT (MI-ESPRIT) algorithm. The resulting two closed-form MI-ESPRIT algorithms incorporate all invariances in arrays composed of several (more...... hiện toàn bộ
Derivative-constrained frequency-domain wideband DOA estimation
Multidimensional Systems and Signal Processing - Tập 25 - Trang 211-233 - 2012
In this paper, we present a new approach for wideband direction of arrival (DOA) estimation incorporating derivative constraints into the optimization problem. The Taylor series expansion of steering vector with respect to frequency exhibits the dependence of sensor snapshots on the derivatives of the array manifold matrix, suppression of which reduces the data to follow the narrowband data model....... hiện toàn bộ
Object recognition by a massively parallel 2-D neural architecture
Multidimensional Systems and Signal Processing - Tập 5 - Trang 179-201 - 1994
The use of a massively parallel neural array for multiple 2-D object recognition is explored. The array architecture has a parallel modular form with each module being trained over a specific object class. One test bed is developed using alphabetic characters which have been subjected to a scale factor and rotational operations. This test bed provides a simultaneous measure of geometric invariance...... hiện toàn bộ
A new method to obtain chain codes from y-axis representation of a region in a binary image
Multidimensional Systems and Signal Processing - Tập 3 - Trang 79-87 - 1992
Chain codes [Freeman 1974; Charavarty 1982; Kim, Lee and Kim 1988; Morrin 1976; Pavlidis 1978] and y-axis representation [Merrill 1973] are both commonly used representation of a region in a binary image. The y-axis representation is very efficient for some geometric applications [Chang and Leu 1990] and morphological operations [Ji, Piper and Tang 1989]. However, it is not efficient to compute th...... hiện toàn bộ
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