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iee computing and control division colloquium on fractals in signal and image processing

IEE Computing and Control Division Colloquium on Fractals in...

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iee computing and control division colloquium on fractals in signal and image processing

The proceedings contains 7 papers from the iee colloquium on fractals in signal and image processing. Topics discussed include: retinotic maps;domain block pixels;Jacquin coding method;fractal interpolation function (... 详细信息

关键词： image processing

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image compression with fractals

Image compression with fractals

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iee computing and control division colloquium on fractals in signal and image processing

作者： Jiang, Jianmin Bolton Inst Bolton United Kingdom

Iterated function system (IFS)-based fractal image compression algorithm stands out as the most promising direction for further research and development. The basic idea is to represent an image by fractals. Each fractal is then represented by a so called IFS which consists of a group of affine transformations. An input image can virtually represented by a group of IFS codes rather than pixels. In this way, a compression ratio as high as 10000:1 can be achieved. Since the image is represented by fractals and each IFS consists of affine transformations, the key point for this algorithm is to find the affine transformation for each fractal and to find fractals which can best describe the original image.

关键词： image compression

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Multiresolution approximation of fractal transforms and its applications

Multiresolution approximation of fractal transforms and its ...

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iee computing and control division colloquium on fractals in signal and image processing

作者： Cheng, Bing Zhu, Xiankun Titterington, D.M. Univ of Kent at Canterbury Kent United Kingdom

A multiresolution approximation framework, provided by fractal transforms to any function in L2(Rd) for d≥1 and which is quite similar to the framework provided by wavelets, is presented. A theoretical support is given for the success of the signal/image compression algorithm using the fractal transform. For the sake of simplicity, only a one-dimensional case is discussed.

关键词： fractals

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Fractal features of the digital measurement of length and area

Fractal features of the digital measurement of length and ar...

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iee computing and control division colloquium on fractals in signal and image processing

作者： Rosen, Dennis Univ Coll London United Kingdom

For objects viewed within images composed of an array of square pixels, the precise results of length and area measurements depend on the relative size of the objects and pixels. Each pixel is represented by its center point, lines by the sequence of four-connected pixels lying closest to the line, and areas by the pixels of which the center lie within the boundary of the figure being studied. The errors to be expected in digital measurement are discussed.

关键词： Spatial variables control

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Speeding up fractal image compression

Speeding up fractal image compression

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iee computing and control division colloquium on fractals in signal and image processing

作者： Bani-Eqbal, Behnam Univ of Manchester Manchester United Kingdom

Fractal coding offers many promising qualities, such as high compression ratio, good image quality and resolution independence of the decoded image. The encoding process suffers, however, from the long search time of the domain block pool. A scheme to speed up the search is presented, as well as an incremental procedure which limits the domain block pixels, given range block and an upper bound on their distance. The domain blocks are arranged in a tree and navigated to select a small number of candidate blocks. Experiments show that the encoding process speeds up by up to 50 times.

关键词： image compression

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Fractal dimension: A statistic for the normal irregularity of fetal heart rate

Fractal dimension: A statistic for the normal irregularity o...

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iee computing and control division colloquium on fractals in signal and image processing

作者： Gough, Nigel A.J. Univ of Wales Coll of Medicine Cardiff United Kingdom

Fractal dimension has the potential to be a useful measure of short term irregularity in fetal heart rate (FHR) recordings. It can provide a quantitative measure of short term variability superior to first order statistics and is simple to calculate. The parameter D provides an analysis of what the clinician is looking at. However, because of the complex nature of FHR variation, D should not be used in isolation but a complete analysis should include the calculation of areas above and below the baseline in order that important features such as accelerations and decelerations can be recognized and assessed.

关键词： fractals

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iee computing and control division colloquium on Systems Design for Testability

IEE Computing and Control Division Colloquium on Systems Des...

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iee computing and control division colloquium on Systems Design for Testability

The proceedings contains 9 papers on Systems design for testability. Topics discussed include standards, microprocessor chips, design complexity, digital signal processing, image processing, avionics, hierarchical systems, systems analysis, mathematical models, genetic algorithms, microelectronics, function evaluation and product design.

关键词： Systems analysis

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iee computing and control division colloquium on Innovations in Instrumentation for Electrical Tomography

IEE Computing and Control Division Colloquium on Innovations...

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iee computing and control division colloquium on Innovations in Instrumentation for Electrical Tomography

The proceedings contain 13 papers on electrical tomographic methods and instrumentation. Topics include electric impedance tomography, electrical capacitance tomography, electromagnetic induction tomography, image con... 详细信息

关键词： Imaging techniques

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signal processing for noise equalization within EIT images

Signal processing for noise equalization within EIT images

引用

iee computing and control division colloquium on Innovations in Instrumentation for Electrical Tomography

作者： Wang, W. Brown, B.H. Barber, D.C. Sheffield Univ Sheffield United Kingdom

A noise equalization method for Electrical Impedance Tomography images based on the use of frequency filtering is presented. It uses a smaller bandwidth applied to small signals than to the larger ones. This means the signal to noise ratio of the image towards the center of the field can be very significantly improved. The method can be applied to both serial and parallel data collection-based systems.

关键词： Imaging techniques

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