1996 |
Santhanam, Balasubramaniam; Maragos, Petros Energy demodulation of two-component AM-FM signal mixtures Conference IEEE Signal Processing Letters, 3 (11), 1996, ISSN: 10709908. BibTeX | Tags: | Links:  @conference{273,
title = {Energy demodulation of two-component AM-FM signal mixtures},
author = { Balasubramaniam Santhanam and Petros Maragos},
booktitle = {IEEE Signal Processing Letters},
volume = {3},
number = {11},
pages = {294--298},
}
|
Tzafestas, C; Coiffet, P Real-time collision detection using spherical octrees: virtual reality application Conference Robot and Human Communication, 1996., 5th IEEE International Workshop on, 1996, ISBN: 0780332539. Abstract | BibTeX | Tags: Context modeling, data structures, direct manipulation, graphical user interfaces, Humans, Layout, Object detection, octrees, Physics computing, polyhedral objects, real-time collision detection, Robotics and automation, Robots, Shape, spherical octrees, Testing, three-dimensional moving objects, virtual reality | Links: @conference{73b,
title = {Real-time collision detection using spherical octrees: virtual reality application},
author = { C Tzafestas and P Coiffet},
booktitle = {Robot and Human Communication, 1996., 5th IEEE International Workshop on},
pages = {500--506},
}
A method for detecting potential collisions between three-dimensional moving objects is described in this paper. An object-centered, spherical octree representation is defined and implemented for the localisation of potentially colliding features between polyhedral objects. These features are subsequently tested for intersection in order to calculate precisely the actual collision points. Application of the algorithm for the direct manipulation of objects in a virtual scene is considered, to investigate its real-time behaviour. The performance of the algorithm is found to remain linear with respect to the complexity of the colliding objects |
1995 |
Maragos, P Slope transforms: theory and application to nonlinear signal processing Journal Article IEEE Transactions on Signal Processing, 43 (4), pp. 864–877, 1995, ISSN: 1053587X. BibTeX | Tags: | Links: @article{83c,
title = {Slope transforms: theory and application to nonlinear signal processing},
author = {P Maragos},
journal = {IEEE Transactions on Signal Processing},
volume = {43},
number = {4},
pages = {864--877},
}
|
Yang, P -F; Maragos, P Min-Max Classifiers: Learnability, Design and Application Journal Article Pattern Recognition, 1995. BibTeX | Tags: | Links:  @article{99b,
title = {Min-Max Classifiers: Learnability, Design and Application},
author = {P -F Yang and P Maragos},
journal = {Pattern Recognition},
}
|
Maragos, Petros; Potamianos, Alexandros Higher Order Differential Energy Operators Journal Article IEEE Signal Processing Letters, 2 (8), pp. 152–154, 1995, ISSN: 15582361. Abstract | BibTeX | Tags: | Links: @article{100,
title = {Higher Order Differential Energy Operators},
author = {Petros Maragos and Alexandros Potamianos},
journal = {IEEE Signal Processing Letters},
volume = {2},
number = {8},
pages = {152--154},
}
Instantaneous signal operators$backslash$nϒtextlesssubtextgreaterktextless/subtextgreater(x)=x˙xtextlesssuptextgreater(k-1)textless/suptextgreater-xxtextlesssuptextgreater(k)textless/suptextgreater of$backslash$ninteger orders k are proposed to measure the cross energy between a$backslash$nsignal x and its derivatives. These higher order differential energy$backslash$noperators contain as a special case, for k=2, the Teager-Kaiser (1990)$backslash$noperator. When applied to (possibly modulated) sinusoids, they yield$backslash$nseveral new energy measurements useful for parameter estimation or AM-FM$backslash$ndemodulation. Applying them to sampled signals involves replacing$backslash$nderivatives with differences that lead to several useful discrete energy$backslash$noperators defined on an extremely short window of samples |
Maragos, Petros; Bovik, Alan C Image demodulation using multidimensional energy separation Journal Article Journal of the Optical Society of America A, 12 (9), pp. 1867, 1995, ISSN: 1084-7529. Abstract | BibTeX | Tags: | Links: @article{101,
title = {Image demodulation using multidimensional energy separation},
author = {Petros Maragos and Alan C Bovik},
journal = {Journal of the Optical Society of America A},
volume = {12},
number = {9},
pages = {1867},
}
Locally narrow-band images can be modeled as two-dimensional (2D) spatial AM–FM signals with several applications in image texture analysis and computer vision. We formulate an image-demodulation problem and present a solution based on the multidimensional energy operator $Phi$(f) = ||∇f||2 − f∇2f. This nonlinear operator is a multidimensional extension of the one-dimensional (1D) energy-tracking operator $Psi$(f) = (f′)2 − ff″, which has been found useful for demodulating 1D AM–FM and speech signals. We discuss some interesting properties of the multidimensional operator and develop a multidimensional energy-separation algorithm to estimate the amplitude envelope and instantaneous frequencies of 2D spatially varying AM–FM signals. Experiments are also presented on applying this 2D energy-demodulation algorithm to estimate the instantaneous amplitude contrast and spatial frequencies of image textures bandpass filtered by means of Gabor filters. The attractive features of the multidimensional energy operator and the 2D energy-separation algorithm are their simplicity, efficiency, and ability to track instantaneously varying spatial-modulation patterns. |
Maragos, P; Potamianos, A; Santhanam, B Instantaneous Energy Operators: Applications to Speech Processing and Communications Conference Proc. IEEE Workshop on Nonlinear Signal and Image Processing, Halkidiki, Greece, pp.955-958, June 1995, 1995. BibTeX | Tags: @conference{274,
title = {Instantaneous Energy Operators: Applications to Speech Processing and Communications},
author = { P. Maragos and A. Potamianos and B. Santhanam},
booktitle = {Proc. IEEE Workshop on Nonlinear Signal and Image Processing, Halkidiki, Greece, pp.955-958, June 1995},
pages = {955--958},
}
|
Potamianos, A; Maragos, P Speech formant frequency and bandwidth tracking using multiband energy demodulation Conference 1995 International Conference on Acoustics, Speech, and Signal Processing, 1 , 1995, ISSN: 1520-6149. Abstract | BibTeX | Tags: | Links: @conference{275,
title = {Speech formant frequency and bandwidth tracking using multiband energy demodulation},
author = { A. Potamianos and P. Maragos},
booktitle = {1995 International Conference on Acoustics, Speech, and Signal Processing},
volume = {1},
pages = {784--787},
}
In this paper, the amplitude and frequency ?AM–FM? modulation model and a multiband demodulation analysis scheme are applied to formant frequency and bandwidth tracking of speech signals. Filtering by a bank of Gabor bandpass filters is performed to isolate each speech resonance in the signal. Next, the amplitude envelope ?AM? and instantaneous frequency ?FM? are estimated for each band using the energy separation algorithm ?ESA?. Short-time formant frequency and bandwidth estimates are obtained from the instantaneous amplitude and frequency signals; two frequency estimates are proposed and their relative merits are discussed. The short-time estimates are used to compute the formant locations and bandwidths. Performance and computational issues of the algorithm are discussed. Overall, multiband demodulation analysis ?MDA? is shown to be a useful tool for extracting information from the speech resonances in the time–frequency plane. |
1994 |
Hanson, H M; Maragos, P; Potamianos, A A system for finding speech formants and modulations via energy separation Journal Article IEEE Transactions on Speech and Audio Processing, 2 (3), pp. 436-443, 1994, ISSN: 1063-6676. Abstract | BibTeX | Tags: | Links: @article{294358,
title = {A system for finding speech formants and modulations via energy separation},
author = {H M Hanson and P Maragos and A Potamianos},
journal = {IEEE Transactions on Speech and Audio Processing},
volume = {2},
number = {3},
pages = {436-443},
}
This correspondence presents an experimental system that uses an energy-tracking operator and a related energy separation algorithm to automatically find speech formants and amplitude/frequency modulations in voiced speech segments. Initial estimates of formant center frequencies are provided by either LPC or morphological spectral peak picking. These estimates are then shown to be improved by a combination of bandpass filtering and iterative application of energy separation.<<ETX>> |
Maragos, Petros Fractal Signal Analysis Using Mathematical Morphology Book Chapter Hawkes, Peter W (Ed.): 88 , pp. 199 - 246, Academic Press, 1994, ISSN: 0065-2539. Abstract | BibTeX | Tags: | Links: @inbook{MARAGOS1994199,
title = {Fractal Signal Analysis Using Mathematical Morphology},
author = {Petros Maragos},
editor = {Peter W Hawkes},
volume = {88},
pages = {199 - 246},
publisher = {Academic Press},
}
Publisher Summary
This chapter provides the definitions of basic morphological transformations for sets and signals—i.e., the erosion, dilation, and opening operations—and surveys the theory of fractal dimensions. There is a proliferation of fractal dimensions, all of which are more or less capable of measuring the degree of fragmentation of a signal's graph; their definitions and interrelationships are also discussed in the chapter. Emphasis is given on the Minkowski–Bouligand dimension, whose analysis is done using morphological operations. The chapter also reviews three classes of parametric fractal signals and related algorithms for their synthesis. The performance of the presented morphological method for measuring fractal dimension is tested by applying it to the above synthetic fractal signals. In the chapter, various covering methods—a class of general and efficient approaches to compute the fractal dimension of arbitrary fractal signals—are discussed. The morphological covering approach to find the fractal dimension of 2D signals are described in the chapter followed by the fractal binary image modeling using collages. |
Bovik, Alan C; Maragos, Petros Conditions for Positivity of an Energy Operator Journal Article IEEE Transactions on Signal Processing, 42 (2), pp. 469–471, 1994, ISSN: 19410476. BibTeX | Tags: | Links: @article{95c,
title = {Conditions for Positivity of an Energy Operator},
author = {Alan C Bovik and Petros Maragos},
journal = {IEEE Transactions on Signal Processing},
volume = {42},
number = {2},
pages = {469--471},
}
|
Potamianos, A; Maragos, P A Comparison of the Energy Operator and Hilbert Transform Approaches for Signal and Speech Demodulation Journal Article Signal Processing, 37 (1), pp. 95–120, 1994. BibTeX | Tags: | Links: @article{96c,
title = {A Comparison of the Energy Operator and Hilbert Transform Approaches for Signal and Speech Demodulation},
author = {A Potamianos and P Maragos},
journal = {Signal Processing},
volume = {37},
number = {1},
pages = {95--120},
}
|
Maragos, Petros Morphological systems: Slope transforms and max-min difference and differential equations Journal Article Signal Processing, 38 (1), pp. 57–77, 1994, ISSN: 01651684. Abstract | BibTeX | Tags: Max-min difference equations, Morphological systems, Slope transforms | Links: @article{97c,
title = {Morphological systems: Slope transforms and max-min difference and differential equations},
author = {Petros Maragos},
journal = {Signal Processing},
volume = {38},
number = {1},
pages = {57--77},
}
Linear time-invariant systems are well understood in the time domain either as convolutions with their impulse response or by describing their dynamics via linear differential equations. Their analysis in the frequency domain using their exponential eigenfunctions and related frequency response is also greatly facilitated via Fourier transforms. Attempting to extend such ideas to nonlinear systems, we present in this paper a theory for a broad class of nonlinear systems and a collection of related analytic tools, which parallel the functionality of and have many conceptual similarities with ideas and tools used in linear systems. These nonlinear systems are time-invariant dilations or erosions, in continuous and discrete time, and obey a supremum- or infimum-of-sums superposition. In the time domain, their equivalence with morphological dilation or erosion by their impulse response is established, and their causality and stability are examined. A class of nonlinear difference did differential equations based on max-min operations is also introduced to describe their dynamics. After finding that the affine signals $alpha$t + b are eigenfunctions of morphological systems, their slope response is introduced as a function of the slope $alpha$, and related slope transforms for arbitrary signals are developed. These ideas provide a transform (slope) domain for morphological systems, where dilation and erosion in time corresponds to addition of slope transforms. Recursive morphological systems, described by max-min difference equations, are also investigated and shown to be equivalent to dilation or erosion by infinite-support structuring elements. Their analysis is significantly aided by using slope transforms. These recursive morphological systems are applied to the design of ideal-cutoff slope-selective filters which are useful for signal envelope estimation. textcopyright 1994. |
Brockett, R W; Maragos, P Evolution equations for continuous-scale morphology.pdf Journal Article 1994. BibTeX | Tags: | Links: @article{98c,
title = {Evolution equations for continuous-scale morphology.pdf},
author = {R W Brockett and P Maragos},
}
|
Maragos, P A Time and Slope Domain Theory of Morphological Systems: Slope Transforms and Max-Min Dynamics Conference Proc. European Signal Processing Conf. (EUSIPCO-94), Edinburgh, Scotland, pp.II:971--974, Sep. 1994, 1994. BibTeX | Tags: @conference{279,
title = {A Time and Slope Domain Theory of Morphological Systems: Slope Transforms and Max-Min Dynamics},
author = { P Maragos},
booktitle = {Proc. European Signal Processing Conf. (EUSIPCO-94), Edinburgh, Scotland, pp.II:971--974, Sep. 1994},
}
|
Maragos, P Differential morphology: Multiscale image dynamics, max-min difference equations, and slope transforms Conference Proceedings - International Conference on Image Processing, ICIP, 2 , 1994, ISSN: 15224880. BibTeX | Tags: | Links: @conference{277,
title = {Differential morphology: Multiscale image dynamics, max-min difference equations, and slope transforms},
author = { P. Maragos},
booktitle = {Proceedings - International Conference on Image Processing, ICIP},
volume = {2},
pages = {545--549},
}
|
Maragos, P; Bovik, A C Demodulation of images modeled by amplitude-frequency modulations using multidimensional energy separation Conference Proceedings - International Conference on Image Processing, ICIP, 3 , 1994, ISSN: 15224880. Abstract | BibTeX | Tags: | Links: @conference{276,
title = {Demodulation of images modeled by amplitude-frequency modulations using multidimensional energy separation},
author = { P. Maragos and A. C. Bovik},
booktitle = {Proceedings - International Conference on Image Processing, ICIP},
volume = {3},
pages = {421--425},
}
Locally narrowband images can be modeled as 2D spatial AM-FM signals with several applications in image texture analysis and computer vision. In this paper we formulate such an image demodulation problem, and present a solution based on the multidimensional energy operator $Phi$(f)=||∇f|| |
Potamianos, A; Maragos, P Applications of Speech Processing Using an AM--FM Modulation Model and Energy Operators Conference Proc. European Signal Process. Conf., 1994. BibTeX | Tags: @conference{278,
title = {Applications of Speech Processing Using an AM--FM Modulation Model and Energy Operators},
author = { A Potamianos and P Maragos},
booktitle = {Proc. European Signal Process. Conf.},
pages = {III: 1669----1672},
}
|
1993 |
H. M. Hanson P. Maragos, ; Potamianos, A Finding Speech Formants and Modulations via Energy Separation: With an Application to a Vocoder Conference Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-93), Minneapolis, MN, 1993. BibTeX | Tags: @conference{Hanson1993,
title = {Finding Speech Formants and Modulations via Energy Separation: With an Application to a Vocoder},
author = {H. M. Hanson, P. Maragos, and A. Potamianos},
booktitle = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-93)},
journal = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-93)},
}
|
Maragos, Petros; Sun, Fang Kuo Measuring the Fractal Dimension of Signals: Morphological Covers and Iterative Optimization Journal Article IEEE Transactions on Signal Processing, 41 (1), pp. 108, 1993, ISSN: 19410476. BibTeX | Tags: | Links: @article{91c,
title = {Measuring the Fractal Dimension of Signals: Morphological Covers and Iterative Optimization},
author = {Petros Maragos and Fang Kuo Sun},
journal = {IEEE Transactions on Signal Processing},
volume = {41},
number = {1},
pages = {108},
}
|
Maragos, P; Kaiser, J F; Quatieri, T F On amplitude and frequency demodulation using energy operators Journal Article IEEE Transactions on Signal Processing, 41 (4), pp. 1532–1550, 1993. BibTeX | Tags: | Links: @article{92c,
title = {On amplitude and frequency demodulation using energy operators},
author = {P Maragos and J F Kaiser and T F Quatieri},
journal = {IEEE Transactions on Signal Processing},
volume = {41},
number = {4},
pages = {1532--1550},
}
|
Maragos, P; Kaiser, J F; Quatieri, T F Energy separation in signal modulation with application to speech analysis Journal Article IEEE Trans. Signal Processing, 41 (4), pp. 3024–3051, 1993. BibTeX | Tags: | Links: @article{93c,
title = {Energy separation in signal modulation with application to speech analysis},
author = {P Maragos and J F Kaiser and T F Quatieri},
journal = {IEEE Trans. Signal Processing},
volume = {41},
number = {4},
pages = {3024--3051},
}
|
Bovik, A C; Maragos, P; Quatieri, T F AM-FM Energy Detection and Separation in Noise Using Multiband Energy Operators Journal Article Proc. IEEE Int'l. Symp. Info. Theory, 41 (12), pp. 3245-3265, 1993, ISBN: 0780308786. BibTeX | Tags: | Links: @article{94c,
title = {AM-FM Energy Detection and Separation in Noise Using Multiband Energy Operators},
author = {A C Bovik and P Maragos and T F Quatieri},
journal = {Proc. IEEE Int'l. Symp. Info. Theory},
volume = {41},
number = {12},
pages = {3245-3265},
}
|
Fuh, C S; Maragos, P; Vincent, L Visual Motion Correspondence by Region-Based Approaches Conference Proc. of 1993 Asian Conference on Computer Vision (ACCV--93), Osaka, Japan, 1993. BibTeX | Tags: | Links: @conference{280,
title = {Visual Motion Correspondence by Region-Based Approaches},
author = { C S Fuh and P Maragos and L Vincent},
booktitle = {Proc. of 1993 Asian Conference on Computer Vision (ACCV--93)},
pages = {784--789},
}
|
Maragos, P Max-Min Difference Equations and Recursive Morphological Systems Conference Proc. Int'l Workshop on Mathematical Morphology and its Applications to Signal Processing, Barcelona, Spain, 1993. BibTeX | Tags: | Links: @conference{281,
title = {Max-Min Difference Equations and Recursive Morphological Systems},
author = { P Maragos},
booktitle = {Proc. Int'l Workshop on Mathematical Morphology and its Applications to Signal Processing},
pages = {168--173},
}
|
Maragos, P; Kaiser, J F; Quatieri, T F On amplitude and frequency demodulation using energy operators Conference Signal Processing IEEE Transactions on, 41 (4), 1993. BibTeX | Tags: | Links: @conference{287,
title = {On amplitude and frequency demodulation using energy operators},
author = { P Maragos and J F Kaiser and T F Quatieri},
booktitle = {Signal Processing IEEE Transactions on},
volume = {41},
number = {4},
pages = {1532--1550},
}
|
Raibert, M; Tzafestas, S; Tzafestas, C Comparative simulation study of three control techniques applied to a biped robot Conference International Conference on Systems, Man and Cybernetics, Le Touquet, France, 1993. BibTeX | Tags: @conference{75,
title = {Comparative simulation study of three control techniques applied to a biped robot},
author = { M Raibert and S Tzafestas and C Tzafestas},
booktitle = {International Conference on Systems, Man and Cybernetics, Le Touquet, France},
pages = {494--502},
}
|
Yang, P -F; Maragos, P Morphological Systems for Character Image Processing and Recognition Conference Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-93), Minneapolis, MN, 1993, ISSN: 07367791. BibTeX | Tags: @conference{282,
title = {Morphological Systems for Character Image Processing and Recognition},
author = { P.-F. Yang and P Maragos},
booktitle = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-93)},
}
|
1992 |
Maragos, P; Kaiser, J F; Quatieri, T F On Separating Amplitude from Frequency Modulations Using Energy Operators Conference Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-92), II , San Fransisco, CA, 1992. BibTeX | Tags: | Links: @conference{Maragos1992,
title = {On Separating Amplitude from Frequency Modulations Using Energy Operators},
author = {P. Maragos and J. F. Kaiser and T. F. Quatieri},
booktitle = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-92)},
journal = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-92)},
volume = {II},
pages = {1-4},
}
|
Yang, P -F; Maragos, P Character Recognition Using Min-Max Classifiers Designed via an LMS Algorithm Conference Visual Communications and Image Processing '92, Proc. SPIE, 1818 , Boston, Massachusetts, 1992. BibTeX | Tags: | Links: @conference{Yang1992,
title = {Character Recognition Using Min-Max Classifiers Designed via an LMS Algorithm},
author = {P.-F. Yang and P. Maragos},
booktitle = {Visual Communications and Image Processing '92, Proc. SPIE},
journal = {Visual Communications and Image Processing '92, Proc. SPIE},
volume = {1818},
pages = {674-685},
}
|
Maragos, P (Ed.) Proceedings of SPIE, Visual Communications and Image Processing, Book SPIE Optical Engineering Press, Bellingham, Washington, USA, 1992. BibTeX | Tags: @book{Maragos1992b,
title = {Proceedings of SPIE, Visual Communications and Image Processing,},
editor = {P. Maragos},
publisher = { SPIE Optical Engineering Press},
}
|
Bovik, A C; Maragos, P; Quatieri, T F Measuring Amplitude and Frequency Modulations in Noise Using Multiband Energy Operators Conference Proceedings of 1992 International Symposium on Time-Frequency and Time-Scale Analysis, (4), Victoria, B.C., Canada, 1992, ISBN: 0-7803-0805-0. Abstract | BibTeX | Tags: | Links: @conference{284,
title = {Measuring Amplitude and Frequency Modulations in Noise Using Multiband Energy Operators},
author = {A.C. Bovik and P. Maragos and T.F. Quatieri},
booktitle = {Proceedings of 1992 International Symposium on Time-Frequency and Time-Scale Analysis},
number = {4},
pages = {3--6},
}
The statistical properties of the nonlinear energy operator Ψ($backslash$ntextlesse1textgreaterstextless/e1textgreater)=(textlesse1textgreaterdstextless/e1textgreater/textlesse1textgreaterdttextless/e1textgreater)textlesssuptextgreater2textless/suptextgreater-textlesse1textgreatersdtextless/e1textgreatertextlesssuptextgreater2$backslash$ntextless/suptextgreater/textlesse1textgreaterdttextless/e1textgreatertextlesssuptextgreater2textless/suptextgreater and a related energy separation algorithm$backslash$n(ESA) are developed. The ESA uses Ψ to demodulate noisy AM-FM$backslash$nsignals. The performance of Ψ and the ESA when applied to bandpass$backslash$nnoisy AM-FM signals is examined. The predicted performance is found to$backslash$nbe greatly improved if the local signal frequencies occur within the$backslash$nfilter passband. Using this observation, a multiband energy operator and$backslash$nESA approach are devised. The results suggest that greatly improved$backslash$npractical strategies are feasible for tracking and identifying local$backslash$npattern coherencies manifested as local concentrations of signal$backslash$nfrequencies |
Brockett, R W; Maragos, P Evolution Equations for Continuous-Scale Morphology Conference Proc. Int'l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-92), III , San Fransisco, CA, 1992. BibTeX | Tags: | Links: @conference{288,
title = {Evolution Equations for Continuous-Scale Morphology},
author = { R W Brockett and P Maragos},
booktitle = {Proc. Int'l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-92)},
volume = {III},
pages = {125-128,},
}
|
Maragos, Petros; Bovik, Alan C; Quatieri, Thomas F A Multidimensional Energy Operator for Image Processing Conference Visual Communications and Image Processing '92, Proc. SPIE, 1818 , 1992, ISSN: 0277786X. BibTeX | Tags: | Links: @conference{285,
title = {A Multidimensional Energy Operator for Image Processing},
author = { Petros Maragos and Alan C Bovik and Thomas F Quatieri},
booktitle = {Visual Communications and Image Processing '92, Proc. SPIE},
volume = {1818},
pages = {177--186},
}
|
Fuh, Chiou-shann; Maragos, Petros Affine models for motion and shape recovery Conference Visual Communications and Image Processing '92, Proc. SPIE, 1818 , Boston, Massachusetts, 1992, ISSN: 0277786X. BibTeX | Tags: | Links: @conference{286,
title = {Affine models for motion and shape recovery},
author = { Chiou-shann Fuh and Petros Maragos},
booktitle = {Visual Communications and Image Processing '92, Proc. SPIE},
volume = {1818},
pages = {120-134},
}
|
1991 |
Fuh, Chiou-Shann; Maragos, Petros Motion displacement estimation using an affine model for image matching Journal Article Optical Engineering, 30 (7), pp. 881, 1991, ISSN: 00913286, (Invited Paper). Abstract | BibTeX | Tags: | Links: @article{90c,
title = {Motion displacement estimation using an affine model for image matching},
author = {Chiou-Shann Fuh and Petros Maragos},
journal = {Optical Engineering},
volume = {30},
number = {7},
pages = {881},
note = {Invited Paper},
}
A model is developed for estimating the displacement field in spatio-temporal image sequences that allows for affine shape deformations of corresponding spatial regions and for affine transformations of the image intensity range. This model includes the block matching method as a special case. The model parameters are found by using a least-squares algorithm. We demonstrate experimentally that the affine matching algorithm performs better in estimating displacements than other standard approaches, especially for long-range motion with possible changes in scene illumination. The algorithm is successfully applied to various classes of moving imagery, including the tracking of cloud motion. |
Fuh, Chiou-sham; Maragos, Petros Affine Models for Image Matching and Motion Detection Conference Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-91), Toronto, Canada, 1991, ISBN: 2977719110000. Abstract | BibTeX | Tags: | Links: @conference{292,
title = {Affine Models for Image Matching and Motion Detection},
author = {Chiou-sham Fuh and Petros Maragos},
booktitle = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-91)},
pages = {2409--2412},
}
A model is developed for detecting the displacement field in spatio-temporal image sequences that al-lows for affine shape deformations of corresponding spatial re-gions and for affine transformations of the image intensity range. This model includes the block matching method as a special case. A least-squares algorithm is used to find the model parameters. It is experimentally demonstrated that the affine matching model performs better than other standard approaches. The resulting 2-D motion estimates are then used by a 3-D affine model and a least-squares algorithm that recover 3-D rigid body motion and depth from two perspective views. |
Maragos, P; Quatieri, T; Kaiser, J Speech nonlinearities, modulations, and energy operators Conference Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-91), Toronto, Canada, 1991, ISSN: 07367791. BibTeX | Tags: speech | Links: @conference{291,
title = {Speech nonlinearities, modulations, and energy operators},
author = { P Maragos and T Quatieri and J Kaiser},
booktitle = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-91)},
pages = {421--424},
}
|
Maragos, Petros Fractal aspects of speech signals: dimension and interpolation Conference Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-91),, Toronto, Canada, 1991, ISSN: 1520-6149. Abstract | BibTeX | Tags: | Links: @conference{290,
title = {Fractal aspects of speech signals: dimension and interpolation},
author = { Petros Maragos},
booktitle = {Proc. Int’l Conf. on Acoustics, Speech, and Signal Processing (ICASSP-91),},
pages = {417--420},
}
The nonlinear dynamics of air flow during speech production may often result in some small or large degree of turbulence. The author quantifies the geometry of speech turbulence, as reflected in the fragmentation of the time signal, by using fractal models. He describes an efficient algorithm for estimating the short-time fractal dimension of speech segmentation and sound classification. He also develops a method for fractal speech interpolation which can be used to synthesize controlled amounts of turbulence in speech or to increase its sampling rate by preserving not its bandwidth (as is classically done) but rather its fractal dimension |
Yang, Ping-fai; Maragos, Petros Learnability of min-max pattern classifiers Conference Visual Communications and Image Processing, Proc. of SPIE, 1606 , Boston, Massachusetts, 1991, ISSN: 0277786X. BibTeX | Tags: @conference{289,
title = {Learnability of min-max pattern classifiers},
author = { Ping-fai Yang and Petros Maragos},
booktitle = {Visual Communications and Image Processing, Proc. of SPIE},
volume = {1606},
pages = {294--308},
}
|
1990 |
Maragos, P; T. F. Quatieri, ; Kaiser, J F Detecting Nonlinearities in Speech using an Energy Operator Conference Proc. IEEE Int'l Workshop on Digital Signal Processing, New Paltz, NY, 1990. BibTeX | Tags: | Links: @conference{293,
title = {Detecting Nonlinearities in Speech using an Energy Operator},
author = {P. Maragos and T. F. Quatieri, and J. F. Kaiser},
booktitle = {Proc. IEEE Int'l Workshop on Digital Signal Processing},
publisher = {New Paltz, NY},
}
|
Bloomberg, D; Maragos, P Generalized Hit-Miss Operations Conference Image Algebra and Morphological Image Processing, Proc. of SPIE, 1350 , San Diego, California, 1990. BibTeX | Tags: @conference{294,
title = {Generalized Hit-Miss Operations},
author = {D Bloomberg and P Maragos},
booktitle = {Image Algebra and Morphological Image Processing, Proc. of SPIE},
volume = {1350},
pages = {116--128},
}
|
Maragos, P Affine Morphology and Affine Signal Models Conference Image Algebra and Morphological Image Processing, Proc. of SPIE, 1350 , San Diego, California, 1990, ISSN: 0277786X. Abstract | BibTeX | Tags: | Links: @conference{295,
title = {Affine Morphology and Affine Signal Models},
author = {P Maragos},
booktitle = {Image Algebra and Morphological Image Processing, Proc. of SPIE},
volume = {1350},
pages = {31--43},
}
|
Maragos, P; Ziff, R D Threshold superposition in morphological image analysis systems Journal Article IEEE Trans. on Pattern Analysis and Machine Intelligence, 12 (5), pp. 498–504, 1990, ISSN: 01628828. BibTeX | Tags: | Links: @article{89c,
title = {Threshold superposition in morphological image analysis systems},
author = {P Maragos and R D Ziff},
journal = {IEEE Trans. on Pattern Analysis and Machine Intelligence},
volume = {12},
number = {5},
pages = {498--504},
}
|
Maragos, Petros; Schafer, Ronald W Morphological Systems for Multidimensional Signal Processing Journal Article Proceedings of the IEEE, 78 (4), pp. 690–710, 1990, ISSN: 15582256. Abstract | BibTeX | Tags: | Links: @article{88c,
title = {Morphological Systems for Multidimensional Signal Processing},
author = {Petros Maragos and Ronald W Schafer},
journal = {Proceedings of the IEEE},
volume = {78},
number = {4},
pages = {690--710},
}
The basic theory and applications of a set-theoretic approach to image analysis called mathematical morphology are reviewed. The goals are to show how the concepts of mathematical morphology geometrical structure in signals to illuminate the ways that morphological systems can enrich the theory and applications of multidimensional signal processing. The topics covered include: applications to nonlinear filtering (morphological and rank-order filters, multiscale smoothing, morphological sampling, and morphological correlation); applications to image analysis (feature extraction, shape representation and description, size distributions, and fractals); and representation theorems, which shows how a large class of nonlinear and linear signal operators can be realized as a combination of simple morphological operations |
Maragos, P; Young, K L Fractal Excitation Signals For CELP Speech Coders Conference Proc. Int’l Conf. on Acoustics, Speech, Signal Processing (ICASSP-90), Albuquerque, New Mexico, 1990, ISSN: 07367791. BibTeX | Tags: | Links: @conference{296,
title = {Fractal Excitation Signals For CELP Speech Coders},
author = { P Maragos and K L Young},
booktitle = {Proc. Int’l Conf. on Acoustics, Speech, Signal Processing (ICASSP-90)},
pages = {669--672},
}
|
Yang, K -M; Maragos, P; Wu, L A VLSI Chip Architecture Design For a 2-D Gray-level Morphological Operations Conference Hybrid Image and Signal Processing II, Proc. of SPIE, 1297 , 1990. BibTeX | Tags: @conference{Yang1990,
title = {A VLSI Chip Architecture Design For a 2-D Gray-level Morphological Operations},
author = {K.-M. Yang and P. Maragos and L. Wu},
booktitle = {Hybrid Image and Signal Processing II, Proc. of SPIE},
journal = {Hybrid Image and Signal Processing II, Proc. of SPIE},
volume = {1297},
pages = {286-295},
}
|
1989 |
Sun, F -K; Maragos, P Experiments on Image Compression Using Morphological Pyramids Conference Visual Communications and Image Processing IV, Proc. of SPIE, 1141 , Philadelphia, PA, 1989. BibTeX | Tags: | Links: @conference{297,
title = {Experiments on Image Compression Using Morphological Pyramids},
author = {F.-K. Sun and P Maragos},
booktitle = {Visual Communications and Image Processing IV, Proc. of SPIE},
volume = {1141},
pages = {1303-1312},
}
|
Maragos, Petros A Representation Theory for Morphological Image and Signal Processing Journal Article IEEE Trans. on Pattern Analysis and Machine Intelligence, 11 (6), pp. 586–599, 1989, ISSN: 01628828. Abstract | BibTeX | Tags: Imagelsignal processing, Mathematical morphology, nonlinearllinear filtering, shape analysis, systems representation | Links: @article{86c,
title = {A Representation Theory for Morphological Image and Signal Processing},
author = {Petros Maragos},
journal = {IEEE Trans. on Pattern Analysis and Machine Intelligence},
volume = {11},
number = {6},
pages = {586--599},
}
A unifying theory for many concepts and operations encountered in or related to morphological image and signal analysis is presented. The unification requires a set-theoretic methodology, where signals are modeled as sets, systems (signal transformations) are viewed as set mappings, and translational-invariant systems are uniquely characterized by special collections of input signals. This approach leads to a general representation theory, in which any translation-invariant, increasing, upper semicontinuous system can be presented exactly as a minimal nonlinear superposition of morphological erosions or dilations. The theory is used to analyze some special cases of image/signal analysis systems, such as morphological filters, median and order-statistic filters, linear filters, and shape recognition transforms. Although the developed theory is algebraic, its prototype operations are well suited for shape analysis; hence, the results also apply to systems that extract information about the geometrical structure of signals |
Fuh, C -S; Maragos, P Region-based Optical Flow Estimation Conference Proc. IEEE Conf. on Computer Vision and Pattern Recognition (CVPR-89), San Diego, California, 1989. BibTeX | Tags: @conference{298,
title = {Region-based Optical Flow Estimation},
author = { C.-S. Fuh and P Maragos},
booktitle = {Proc. IEEE Conf. on Computer Vision and Pattern Recognition (CVPR-89)},
pages = {130-135},
}
|
