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7th International Conference on signal processing

作者： Wang, LD Huang, SB Shi, ZL Chinese Acad Sci Shenyang Inst Automat Shenyang 110016 Peoples R China

ISBN: (纸本)7121002159

In the paper, a kind of definition of directional fractal dimension is proposed, a method based on the directionally deformable neighborhood to compute the parameter of directional fractal dimension is given, and its effectiveness is proved by experiments in moving target detection. We can compute the directional fractal parameter by selecting the Suitable pixels in the deformable neighborhood according to the image texture with directional feature. Then the position of the target can be confirmed by the difference between the target and the background in the directional fractal parameter. Compared with traditional fractal dimension, directional fractal dimension has some characteristics as accurate detection and fast computation.

关键词： fractals directional fractal dimension image processing taroet detection

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Some advances in nonlinear speech modeling using modulations, fractals, and chaos 14

Some advances in nonlinear speech modeling using modulations...

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14th International Conference on Digital signal processing (DSP 2002)

作者： Maragos, P Dimakis, AG Kokkinos, I Natl Tech Univ Athens Dept ECE GR-15773 Athens Greece

ISBN: (纸本)0780375033

In this paper we briefly summarize our on-going work on modeling nonlinear structures in speech signals, caused by modulation and turbulence phenomena, using the theories of modulation, fractals, and chaos as well as suitable nonlinear signal analysis methods. Further, we focus on two advances: i) AM-FM modeling of fricative sounds with random modulation signals of the 1/f-noise type and ii) improved methods for speech analysis and prediction on reconstructed multidimensional attractors.

关键词： fractals

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image retrieval using a fractal signature extraction technique 14

Image retrieval using a fractal signature extraction techniq...

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14th International Conference on Digital signal processing (DSP 2002)

作者： Nikolaou, N Papamarkos, N Democritus Univ Thrace Dept Elect & Comp Engn GR-67100 Xanthi Greece

ISBN: (纸本)0780375033

Content-based image retrieval has become a reliable tool for digital image applications, especially for image retrieval purposes. There are several advantages of the image retrieval techniques compared to other simple retrieval approaches such as text-based retrieval techniques. This paper proposes a new method for color image retrieval, suitable for color image databases. It is based on a fractal scanning technique, which is used to extract signatures for each one of the RGB color components. Features extracted from these signatures are next used for image comparison and retrieval. The system is suitable for retrieving query images even in distortion cases such as deformations, noise, color reduction and smoothing.

关键词： fractals

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SAR image feature extraction and classification with Fractal-based description 6

SAR image feature extraction and classification with Fractal...

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6th International Conference on signal processing

作者： Xu, J Lu, L Feng, ZM Peng, YN Tsing Hua Univ Dept Elect Engn Beijing 100084 Peoples R China

ISBN: (纸本)0780374886

In the field of Synthetic. Aperture Radar (SAR) image analysis, an effective feature extraction method based on Fractal Brown Increment Random Field (FBRIR) is introduced, and an effective classification method with neuron network based on Adaptive Resonance Theory (ART) is. designed accordingly. At last the validity of this systematic approach is tested and compared using the real data of Ku band SAR images.

关键词： fractals

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VLSI architecture for quadtree-based fractal image coding

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iee PROCEEDINGS-COMPUTERS AND DIGITAL TECHNIQUES 2001年第4-5期148卷 141-146页

作者： Lee, S Omachi, S Aso, H Tohoku Univ Grad Sch Engn Dept Elect & Commun Engn Aoba Ku Sendai Miyagi 9808579 Japan

A VLSI architecture for flexible-size fractal image coding is proposed. The main features of this architecture are that it is capable of performing fractal image coding based on quadtree partitioning without the external memory for the fixed domain pool and uses only local data communication. Since large domain blocks consist of small domain blocks, the calculations of distortion for all kinds of domain block are performed using only the domain pool, which is extracted from the smallest range blocks of the neighbouring processors. This architecture has a fast comparison module which can compute the distortions between a range block and the eight isometric transformations of domain blocks by one full rotation around the centre.

关键词： Pattern recognition and computer vision equipment smallest range blocks fractals Combinatorial mathematics fast comparison module VLSI architecture VLSI isometric transformations File organisation local data communication flexible-size fractal image coding Graphics techniques Semiconductor integrated circuits Computer vision and image processing techniques large domain blocks image coding quadtrees quadtree partitioning signal processing and conditioning equipment and techniques distortion image processing equipment image and video coding neighbouring processors small domain blocks quadtree based fractal image coding signal processing theory

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Introduction to fractional linear systems. Part 2: Continuous-time case

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iee PROCEEDINGS-VISION image AND signal processing 2000年第1期147卷 71-78页

作者： Ortigueira, MD Univ Tecn Lisboa Inst Super Tecn P-114 Monte De Caparica Portugal Univ Nova Lisboa P-114 Monte De Caparica Portugal INESC P-1000 Lisbon Portugal

In the paper, the class of discrete linear systems is enlarged with the inclusion of discrete-time fractional linear systems. These are systems described by fractional difference equations and fractional frequency responses. It is shown how to compute the impulse response and transfer function. Fractal signals are introduced as output of special linear systems: fractional differaccumulators, systems that can be considered as having fractional poles or zeros. The concept of fractional differaccumulation is discussed, generalising the notions of fractal and lif noise, and introducing two kinds of fractional differaccumulated stochastic process: hyperbolic, resulting from fractional accumulation (similar to the continuous-time case), and parabolic noise, resulting from fractional differencing.

关键词： signal processing 1/f noise fractals Mathematical analysis difference equations poles and zeros discrete linear systems stochastic processes parabolic equations signal processing and detection zeros frequency response impulse response fractional frequency responses fractional differaccumulation transfer functions linear systems parabolic noise special linear systems hyperbolic process fractal noise discrete-time fractional linear systems discrete time systems transfer function stochastic process fractal signals fractional differaccumulators Other topics in statistics fractional difference equations fractional poles transient response fractional differencing Differential equations (numerical analysis) hyperbolic equations signal processing theory fractional linear systems

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A data-embedding technique for digital images

A data-embedding technique for digital images

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作者： Silvestre, G.C.M. Dowling, W.J. University College Dublin Ireland University of Dublin Ireland

A number of schemes have recently been proposed for hiding data in digital audio, still images and video. The approaches differ in the amount of distortion brought to the original host signal, their robustness to compression and other signal processing operations, and the amount of data which can be embedded. In this paper we present a technique for embedding data in digital still images. The proposed scheme employs digital communication techniques. The information is embedded in the frequency domain by modulating selected DFT values of the image. Properties of the human visual system are employed in choosing the DFT values to be modulated. The selected DFT values are grouped into different frequency bands. A different label can then be embedded in each of the frequency bands. The performance of the proposed scheme is assessed by computer simulations. The original image is not required to recover the embedded information.

关键词： image processing

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Real-time implementation of fractal image encoder

Real-time implementation of fractal image encoder

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10th Mediterranean Electrotechnical Conference on Information Technology and Electrotechnology for the Mediterranean Countries

作者： Rejeb, B Anheier, W Univ Bremen Inst Electromagnet Theory & Microelect D-28334 Bremen Germany

ISBN: (纸本)078036290X

Fractal image compression insures high compression ratio and image fidelity, however, it suffers from long encoding time. Real time fractal coding requires high throughput not achievable by software implementations or with general digital signal processor (DSP), In this paper, a high throughput hardware/software architecture for real time fractal coding is presented. The encoder is characterised by a reduced domain pool and an optimal luminance transformation parameter calculation, The self- similarity search is implemented in a parallel architecture allowing the processing of a couple of 4x4 blocks simultaneously.

关键词： image compression fractals VLSI real-time-implementation

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Digital watermarking with complex wavelets

Digital watermarking with complex wavelets

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作者： Loo, Patrick Kingsbury, Nick Signal Processing Group Dept. of Engineering University of Cambridge Cambridge CB2 1PZ United Kingdom

In this paper, we propose a watermarking algorithm in the complex wavelet domain. We then model watermarking as a communication process and show that the complex wavelet domain has relatively high capacity and is a potentially good domain for watermarking. Finally, a technique for registering geometrically distorted images, which is based on motion estimation in the wavelet domain, is described. The registration process can assist watermark detection in a watermarked image attacked by Stirmark, for example.

关键词： Digital watermarking

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The analysis of multiple linear chirp singnals

The analysis of multiple linear chirp singnals

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作者： Capus, Chris Rzhanov, Yuri Linnett, Laurie Image Analysis Research Group Heriot-Watt University Center for Coastal and Ocean Mapping University of New Hampshire

This paper presents a technique for the analysis and extraction of multiple linear chirps in a time signal. These signals occur in nature and are becoming increasingly important in sonar, geophysical, ultrasonic and radar applications. The work is based on and closely related to the fractional Fourier transform (FrFT), which was introduced in its current form by Namias in 1979, although the principles underlying the FrFT can be found in the work of Wiener and Weyl in the 1920s. The paper considers discrete analysis and synthesis of complex signals containing linear chirps with various characteristics. We show how individual chirps in a mixture of chirps (not necessarily linear) can be extracted and investigate the filtering and reconstruction of mixed chirp signals. Examples are presented to illustrate the concepts using both synthetic signals and real data. A visual interpretation of the magnitude and phase of the analytic results is introduced allowing a range of transform orders to be viewed simultaneously. The filtering of linear and 'near-linear' chirp signals is also discussed alongside the efficient pulse compression characteristics of the FrFT.

关键词： signal processing

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