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Secure blind image steganographic technique using discrete Fourier transformation

Secure blind image steganographic technique using discrete F...

引用

IEEE International Conference on image processing

作者： F. Alturki R. Mersereau Department of Electronic Engineering College of Technological Studies Shuwaikh Kuwait Center for Signal and Image Processing Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

We present a new steganographic technique for covert communications. The technique embeds the hidden information in the DFT domain after permuting the image pixels in the spatial domain using a key. The permutation process introduces randomness into the cover image and results in a significant increase in the number of transform coefficients that can be used to transmit the hidden information. The hidden information is embedded using a quantization technique. The perceptual and statistical properties of the cover and the stego images remain similar for small quantization steps. The security of the system is examined against known stego attack.

关键词： Steganography Decorrelation Pixel Quantization Information security Cryptography Application software Frequency image converters Educational institutions

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Unsupervised estimation of the human vocal tract length over sentence level utterances 25

Unsupervised estimation of the human vocal tract length over...

引用

25th IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP 2000

作者： Necioǧlu, Burhan F. Clements, Mark A. Barnwell, Thomas P. Center for Signal and Image Processing School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States

ISBN: (纸本)0780362934

This paper describes a method for the unsupervised and gender-independent estimation of the average human vocal tract length from the speech waveform, and reports results obtained on Fant's (1960) X-ray vowel data as well as results from experiments performed on multiple sentence utterances of 86 male and 78 female TIMIT speakers, including correlation analyses between the vocal tract length estimates and given body heights. The investigated error criteria that make non-iterative, closed-form estimator solutions possible are all found to achieve good speaker clustering potential for both male and female subgroups. © 2000 IEEE.

关键词： Iterative methods

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A C++ research and development environment for speech and audio processing applications

A C++ research and development environment for speech and au...

引用

34th Asilomar Conference

作者： Erdem Ertan, A. Barnwell III, T.P. School of Elec./Computer Engineering Center for Signal/Image Processing Georgia Institute of Technology 250 14th Street NW Atlanta GA 30318 United States

Speech and audio processing algorithms, which are based on the processing of the features and signals, are often written using poor programming styles. Understanding the existing source code and extending it is thus a time-consuming process that forces researchers to deal with programming problems instead of speech and audio processing innovations. We have developed a new system in C++ to overcome these problems. The programming techniques used in this environment allow a researcher to concentrate on innovations in an environment that still allows the rapid implementation of efficient real-time speech and audio processing applications.

关键词： Speech processing

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Migration of underground targets in UWB-SAR systems

Migration of underground targets in UWB-SAR systems

引用

IEEE International Conference on image processing

作者： W. Lertniphonphun J.H. McClellan Center for Signal and Image Processing School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0780362977

Ultra-wideband synthetic aperture radar (UWB-SAR) systems can be used for imaging underground targets. However, conventional imaging algorithms that assume a constant velocity of propagation will exhibit degradations such as blurred targets and incorrect target locations. A superior approach is to do the processing by migrating the raw data collected by an array of sensors. In this paper, we use a filtering structure for migration as a 2-D all-pass filter, and present a practical processing method for UWB-SAR imaging. Improvements versus conventional SAR image focusing are included.

关键词： Focusing Sensor arrays Ultra wideband technology Filtering Iterative algorithms image generation image sensors Government Pixel signal processing

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Maximum likelihood training of the embedded HMM for face detection and recognition

Maximum likelihood training of the embedded HMM for face det...

引用

IEEE International Conference on image processing

作者： A.V. Nefian M.H. Hayes Center for Signal and Image Processing School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0780362977

The embedded hidden Markov model (HMM) is a statistical model that can be used in many pattern recognition and computer vision applications. This model inherits the partial size invariance of the standard HMM, and, due to its pseudo two-dimensional structure, is able to model two-dimensional data such as images, better than the standard HMM. We describe the maximum likelihood training for the continuous mixture embedded HMM and present the performance of this model for face detection and recognition. The experimental results are compared with other approaches to face detection and recognition.

关键词： Maximum likelihood detection Hidden Markov models Face detection Face recognition Pattern recognition Computer vision Probability distribution image recognition signal processing image processing

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Low bit-rate subband video coding using context models

Low bit-rate subband video coding using context models

引用

IEEE International Conference on image processing

作者： M.Z. Coban R.M. Mersereau Center for Signal & Image Processing School of Electrical & Computer Engineering Georgia Institute of Technology Atlanta GA USA

We propose a hybrid low bit-rate subband video coding scheme utilizing context models, rate-constrained motion estimation and overlapped motion compensation. Emerging efficient context-based entropy coding techniques fit very well into wavelet/subband-based coding systems, making them very attractive candidates for the entropy coding part of a wavelet/subband-based video coding scheme. A multidimensional probability modeling technique along with context-based entropy coding are utilized to exploit redundancies in the subband structure, yielding better compression.

关键词： Video coding Context modeling Entropy coding Video compression image coding Motion estimation Bit rate Probability distribution signal design Statistical distributions

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A C++ research and development environment for speech and audio processing applications

A C++ research and development environment for speech and au...

引用

Asilomar Conference on signals, Systems & Computers

作者： A. Erdem Ertan T.P. Barnwell School of Electrical and Computer Engineering Center for Signal and Image Processing Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0780365143

关键词： Research and development Speech processing Technological innovation Programming profession Data mining Flowcharts Application software signal processing Computer languages Data analysis

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Complexity-scalable transform coding using variable complexity algorithms

Complexity-scalable transform coding using variable complexi...

引用

Data Compression Conference (DCC)

作者： W. Pan A. Ortega Integrated Media Systems Center and Signal and Image Processing Institute Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

In applications where compression has to be performed under varying complexity constraints (e.g., with hardware having to operate in reduced power mode) it is beneficial to design compression algorithms that allow some degree of complexity scalability. In this paper we explore complexity scalability for transform coding algorithms. We show that a variable complexity algorithm (VCA), which uses energy thresholds to determine the number of coefficients to be computed for each input, is preferable to other alternatives such as a pruned transform, where the same number of coefficients is computed for the whole image. We show that the benefits include not only a higher degree of scalability, but also increased compression performance, as we take advantage of the energy classification that is needed for VCA operation and design quantizers that match each class. We provide expressions for the average complexity as well as rate/distortion relations for a generic N-point VCA transform. For a two point case, we present closed-form relations describing the variance changes in two classes. In addition, rate-distortion-complexity relations are also empirically obtained. We apply VCA to eight-point KLT and 8/spl times/8 DCT in the JPEG framework and experiments show that the VCA approach is superior in rate/distortion performance at low rates compared to the standard transform coding techniques.

关键词： Transform coding

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Optimal scheduling for streaming of scalable media

Optimal scheduling for streaming of scalable media

引用

Asilomar Conference on signals, Systems & Computers

作者： Z. Miao A. Ortega Integrated Media Systems Center Signal and Image Processing Institute Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

ISBN: (纸本)0780365143

Scalable, or layered, media representation appears to be more suitable for transmission over the current heterogeneous networks. In this paper we study the problem of scalable layered streaming media delivery over a lossy channel. The goal is to find an optimal transmission policy to achieve the best playback quality at the client end. The problem involves some trade-offs such as time-constrained delivery and data dependencies. For example, a layer should be dropped before transmission if it already has a delay such that it cannot be played before its scheduled time. Moreover, less important layers with near-playback-time may also be dropped or delayed for delivery in order to save bandwidth for other layers with a high priority. We propose a framework for scalable streaming media delivery, that involves a novel scheduling algorithm called Expected runtime Distortion Based Scheduling (EDBS) which decides the order in which packets should be transmitted in order to improve client playback quality in the presence of channel losses. A fast greedy search algorithm is presented that achieves almost the same performance as an exhaustive search technique (98% of the time it results in the same schedule) with very low complexity and is applicable for real-time application.

关键词： Streaming media Optimal scheduling Decoding Bandwidth Nonhomogeneous media Delay effects Scheduling algorithm Propagation losses signal processing image processing

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Error analysis for quadtree image formation

Error analysis for quadtree image formation

引用

IEEE International Conference on image processing

作者： L.M. Kaplan Seung-Mok Oh M. Cobb J.H. McClellan Department of Engineering Clark Atlanta University Atlanta GA USA Center for Signal and Image Processing School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0780362977

The quadtree image formation technique is a computationally efficient approximation to standard backprojection. Where the computational load of backprojection is O(N/sup 3/) for N sensors forming an N/spl times/N image, the quadtree method uses a divide-and-conquer strategy similar to the fast Fourier transform (FFT) to reduce the computational load down to O(N/sup 2/ log(N)). However, the quadtree introduces errors in the relative time shifts used to focus pulses. These errors reduce the signal gain in the mainlobe response for isotropic point-like targets. In addition, the oscillations of the sidelobes increase from stage to stage. This paper develops performance bounds for the mainlobe losses under far field conditions and relates these bounds to the slow-time Nyquist rate.

关键词： Error analysis Synthetic aperture radar Radar scattering Layout Radar imaging Frequency image sensors Ultra wideband radar Motion compensation Geometry

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