期刊文献+
共找到352篇文章
< 1 2 18 >
每页显示 20 50 100
AFFINE TRANSFORMATION IN RANDOM ITERATED FUNCTION SYSTEMS
1
作者 XIONG Yong(熊勇) +1 位作者 SHI Ding-hua(史定华) 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2001年第7期820-826,共7页
Random iterated function systems (IFSs) is discussed, which is one of the methods for fractal drawing. A certain figure can be reconstructed by a random IFS. One approach is presented to determine a new random IFS, th... Random iterated function systems (IFSs) is discussed, which is one of the methods for fractal drawing. A certain figure can be reconstructed by a random IFS. One approach is presented to determine a new random IFS, that the figure reconstructed by the new random IFS is the image of the origin figure reconstructed by old IFS under a given affine transformation. Two particular examples are used to show this approach. 展开更多
关键词 fractal random iterated function system affine transformation
下载PDF
ON THE BOX DIMENSION FOR A CLASS OF NONAFFINE FRACTAL INTERPOLATION FUNCTIONS 被引量:3
2
作者 L.Dalla V.Drakopoulos M.Prodromou 《Analysis in Theory and Applications》 2003年第3期220-233,共14页
We present lower and upper bounds for the box dimension of the graphs of certain nonaffine fractal interpolation functions by generalizing the results that hold for the affine case.
关键词 fractal Box dimension iterated function system
下载PDF
Graph-Directed Coalescence Hidden Variable Fractal Interpolation Functions
3
作者 Md. Nasim Akhtar M. Guru Prem Prasad 《Applied Mathematics》 2016年第4期335-345,共11页
Fractal interpolation function (FIF) is a special type of continuous function which interpolates certain data set and the attractor of the Iterated Function System (IFS) corresponding to a data set is the graph of the... Fractal interpolation function (FIF) is a special type of continuous function which interpolates certain data set and the attractor of the Iterated Function System (IFS) corresponding to a data set is the graph of the FIF. Coalescence Hidden-variable Fractal Interpolation Function (CHFIF) is both self-affine and non self-affine in nature depending on the free variables and constrained free variables for a generalized IFS. In this article, graph directed iterated function system for a finite number of generalized data sets is considered and it is shown that the projection of the attractors on is the graph of the CHFIFs interpolating the corresponding data sets. 展开更多
关键词 iterated function System Graph-Directed iterated function System fractal Interpolation functions Coalescence Hidden Variable FIFs
下载PDF
Markov迭代函数系统分形的动力学特性分析 被引量:2
4
作者 章立亮 《工程图学学报》 CSCD 北大核心 2009年第6期132-136,共5页
研究Markov迭代函数系统(MIFS)的转移概率矩阵与MIFS吸引子分形结构之间的关系。首先提出了分支Markov迭代函数系统的概念并将MIFS系统分解成若干分支系统,给出和证明了几个相关定理。然后讨论转移概率矩阵的零元素对吸引子结构的影响,... 研究Markov迭代函数系统(MIFS)的转移概率矩阵与MIFS吸引子分形结构之间的关系。首先提出了分支Markov迭代函数系统的概念并将MIFS系统分解成若干分支系统,给出和证明了几个相关定理。然后讨论转移概率矩阵的零元素对吸引子结构的影响,分析吸引子的局部结构特征,发现MIFS系统吸引子包含自相似结构,基于计算机数学实验分析了吸引子分形形成的动力学特性并给予具体的定性描述。 展开更多
关键词 计算机应用 迭代函数系统 markov 分形
下载PDF
一种基于Markov矩阵的分形建模方法
5
作者 章立亮 《计算机应用与软件》 CSCD 2010年第12期115-117,共3页
提出一种基于转移概率矩阵的Markov迭代函数系统分形吸引子的建模方法。将MIFS的仿射变换实施多级化的分解,利用转移概率矩阵对吸引子的局部子图像做Markov变形处理,基于计算机数学实验给出了雪花分形和树木分形的应用实例,表明该方法... 提出一种基于转移概率矩阵的Markov迭代函数系统分形吸引子的建模方法。将MIFS的仿射变换实施多级化的分解,利用转移概率矩阵对吸引子的局部子图像做Markov变形处理,基于计算机数学实验给出了雪花分形和树木分形的应用实例,表明该方法能够有效地控制分形吸引子的局部变形。 展开更多
关键词 迭代函数系统 markov 变形 分形
下载PDF
Application of Fractal Theory in Landscape Design
6
作者 王雨竹 《Journal of Landscape Research》 2012年第3期29-31,共3页
Research and application of fractal theory in landscape design has greatly enriched the concepts and techniques of garden creation,and pushed forward landscape design closer to the natural world.By elaborating interna... Research and application of fractal theory in landscape design has greatly enriched the concepts and techniques of garden creation,and pushed forward landscape design closer to the natural world.By elaborating internal connection between fractal theory and landscape design,this paper uses iterative function system of the fractal theory and matlab to draw fractal trees.Two designed experiments demonstrate that the fractal theory can be employed to realize the vivid drawing of natural landscapes with the support of limited data.Therefore,fractal theory is a practical tool used to draw vivid natural landscapes efficiently. 展开更多
关键词 LANDSCAPE architecture LANDSCAPE design fractal THEORY SELF-SIMILARITY ITERATIVE function system Matlab
下载PDF
Static Image Compression Based on Fractal Theory 被引量:1
7
作者 Lin Yixia Zhu Quanfan Liu Jun ((School of Automation) 《Advances in Manufacturing》 SCIE CAS 1998年第3期82-85,共4页
In this paper, image compression and decompression are realized on a personal computer based on fractal theory. The algorithm is effectiveas as the reconstructed image is similar to the original. In the algorithm, the... In this paper, image compression and decompression are realized on a personal computer based on fractal theory. The algorithm is effectiveas as the reconstructed image is similar to the original. In the algorithm, the formulas for contrast scaling and luminance shift are simplified,and the Hausdorff distance is replaced by the Euclidean distance. Thus, the calculation load is reduced. The formula for compression ratio is presented for an ideal situation, from which one can analyze how the different factors influence image compression ratio. 展开更多
关键词 fractal iterated function systems image compression
下载PDF
Embedding a Signature in an Image Based on Fractal Compress Transformations 被引量:1
8
作者 CaoHanqiang ZhuGuangxi 《通信学报》 EI CSCD 北大核心 1998年第5期69-74,共6页
EmbeddingaSignatureinanImageBasedonFractalCompresTransformationsCaoHanqiangZhuGuangxiZhuYaotingZhangZhengbi... EmbeddingaSignatureinanImageBasedonFractalCompresTransformationsCaoHanqiangZhuGuangxiZhuYaotingZhangZhengbing(HuazhongUniver... 展开更多
关键词 数字图像 分形压缩转换 迭代 数字签字
下载PDF
Realization of Fractal Affine Transformation 被引量:1
9
作者 XU Jing, LIN Yi xia School of Electromechanical Engineering and Automation, Shanghai University, Shanghai 200072, China 《Journal of Shanghai University(English Edition)》 CAS 2001年第1期31-34,共4页
This paper gives the definition of fractal affine transformation and presents a specific method for its realization and its corresponding mathematical equations which are essential in fractal image construction.
关键词 fractal IFS (iterated function system) affine transformation
下载PDF
On Complete Bicubic Fractal Splines
10
作者 Arya Kumar Bedabrata Chand María A. Navascués 《Applied Mathematics》 2010年第3期200-210,共11页
Fractal geometry provides a new insight to the approximation and modelling of experimental data. We give the construction of complete cubic fractal splines from a suitable basis and their error bounds with the origina... Fractal geometry provides a new insight to the approximation and modelling of experimental data. We give the construction of complete cubic fractal splines from a suitable basis and their error bounds with the original function. These univariate properties are then used to investigate complete bicubic fractal splines over a rectangle Bicubic fractal splines are invariant in all scales and they generalize classical bicubic splines. Finally, for an original function , upper bounds of the error for the complete bicubic fractal splines and derivatives are deduced. The effect of equal and non-equal scaling vectors on complete bicubic fractal splines were illustrated with suitably chosen examples. 展开更多
关键词 fractals iterated function systems fractal INTERPOLATION functionS fractal Splines Surface APPROXIMATION
下载PDF
A NEW FRACTAL IMAGE CODING METHOD
11
作者 Yin Zhongke Yang Shaoguo Gu Deren (University of Electronic Science and Technology of China, Chengdu, 610054) 《Journal of Electronics(China)》 1998年第2期125-129,共5页
Some shortcomings of common fractal image coding methods are studied , then they are corrected with a new method. The new method is improved further in DCT domain. Coding results show the advantage of the new method.
关键词 fractal Image CODING ITERATIVE function SYSTEM PARTITION ITERATIVE function SYSTEM
下载PDF
A HIGH SPEED ADAPTIVE FRACTAL IMAGE CODING ALGORITHM USING FLEXIBLE CLASSIFICATION TECHNIQUE
12
作者 Zhang Liang Li Weihua Wang Qiao 《Wuhan University Journal of Natural Sciences》 CAS 1998年第2期146-146,共1页
Traditionally, fractal image compression suffers from lengthy encoding time in measure ofhours. In this paper, combined with characteristlcs of human visual system, a flexible classification technique is proposed. Thi... Traditionally, fractal image compression suffers from lengthy encoding time in measure ofhours. In this paper, combined with characteristlcs of human visual system, a flexible classification technique is proposed. This yields a corresponding adaptive algorithm which can cut down the encoding timeinto second's magnitude. Experiment results suggest that the algorithm can balance the overall encodingperformance efficiently, that is, with a higher speed and a better PSNR gain. 展开更多
关键词 image coding fractal image coding iterated function system (IFS) partitioned iterated function system (PIFS) characteristics of human visual system
下载PDF
A new fractal algorithm to model discrete sequences
13
作者 翟明岳 Heidi Kuzuma James W. Rector 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第9期274-278,共5页
Employing the properties of the affine mappings, a very novel fractal model scheme based on the iterative function system is proposed. We obtain the vertical scaling factors by a set of the middle points in each affin... Employing the properties of the affine mappings, a very novel fractal model scheme based on the iterative function system is proposed. We obtain the vertical scaling factors by a set of the middle points in each affine transform, solving the difficulty in determining the vertical scaling factors, one of the most difficult challenges faced by the fractal interpolation. The proposed method is carried out by interpolating the known attractor and the real discrete sequences from seismic data. The results show that a great accuracy in reconstruction of the known attractor and seismic profile is found, leading to a significant improvement over other fractal interpolation schemes. 展开更多
关键词 fractal interpolation the vertical scaling factors iterative function system seismic data
下载PDF
A Fast Fractal Image Compression Coding Method
14
作者 XU Chang man 1, ZHANG Zhao yang School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China 《Journal of Shanghai University(English Edition)》 CAS 2001年第1期57-59,共3页
Fast algorithms for reducing encoding complexity of fractal image coding have recently been an important research topic. Search of the best matched domain block is the most computation intensive part of the fractal en... Fast algorithms for reducing encoding complexity of fractal image coding have recently been an important research topic. Search of the best matched domain block is the most computation intensive part of the fractal encoding process. In this paper, a fast fractal approximation coding scheme implemented on a personal computer based on matching in range block's neighbours is presented.Experimental results show that the proposed algorithm is very simple in implementation, fast in encoding time and high in compression ratio while PSNR is almost the same as compared with Barnsley's fractal block coding . 展开更多
关键词 neighbour fractal block coding range block domain block iterated function system
下载PDF
Generalized Product of Iteration Function System
15
作者 ZHAO Ting-ting WEI Xiao-peng XIA Jun-tian SANG Lin 《Computer Aided Drafting,Design and Manufacturing》 2005年第2期44-49,共6页
The definition of generalized product of fractal is first put forward for the research on the relations between original fractal and its product of fractal when the transformations of iteration function system (IFS)... The definition of generalized product of fractal is first put forward for the research on the relations between original fractal and its product of fractal when the transformations of iteration function system (IFS) are incomplete. Then the representations of generalized product of IFS are discussed based on the theory of the product of fractal. Furthermore, the dimensional relations between the product of fractal and its semi-product are obtained. The dimensional relations of self-similar set are discussed. Finally, the examples for rendering fractal graphs are given. These results posses potentials in image compression and pattern recognition. 展开更多
关键词 fractal iteration function system product of fractal semi-product of fractal generalized product of fractal
下载PDF
一个迭代函数系统的分形混沌特性及其应用 被引量:1
16
作者 叶瑞松 陈月明 《汕头大学学报(自然科学版)》 2023年第2期3-30,F0002,共29页
介绍迭代函数系统生成分形的原理以及分形位移动力系统的混沌特性.构造了一个迭代函数系统,用于生成充满整个单位正方形的填充曲线,理论上证明该迭代函数系统的分形位移动力系统的Devaney混沌特性.将该迭代函数系统的分形位移动力系统... 介绍迭代函数系统生成分形的原理以及分形位移动力系统的混沌特性.构造了一个迭代函数系统,用于生成充满整个单位正方形的填充曲线,理论上证明该迭代函数系统的分形位移动力系统的Devaney混沌特性.将该迭代函数系统的分形位移动力系统参数化,数值上验证该分形位移动力系统的混沌性能,并使用该混沌系统设计了一个基于DNA运算的混沌图像加密算法,详细分析了该加密算法的安全性. 展开更多
关键词 迭代函数系统 分形 填充曲线 混沌 动力系统 图像加密
下载PDF
FUNCTIONAL LAW OF ITERATED LOGARITHM FOR ADDITIVE FUNCTIONALS OF REVERSIBLE MARKOV PROCESSES
17
作者 吴黎明 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2000年第2期149-161,共13页
Using the forward-backward martingale decomposition and the martingale limit theorems, we establish the functional law of iterated logarithm for an additive functional (At) of a reversible Markov process, under the mi... Using the forward-backward martingale decomposition and the martingale limit theorems, we establish the functional law of iterated logarithm for an additive functional (At) of a reversible Markov process, under the minimal condition that σ~2(A)= tim BA_t~2/t exists in R. We extend also t →∞ the previous remarkable functional central limit theorem of Kipnis and Varadhan. 展开更多
关键词 functional law of iterated logarithm forward-backword martingale decomposition reversible markov processes
全文增补中
基于近距自相似模型的分形图像编码方法 被引量:16
18
作者 张正炳 朱耀庭 +1 位作者 朱光喜 朱芳 《通信学报》 EI CSCD 北大核心 1997年第2期29-34,共6页
为了克服分形图像编码方法速度低的弱点,提出了根据图像模型研究相应算法的思想。基于ρ|r|图像模型,导出了与之相应的近距自相似模型,提供了一种适合于该模型的分形图像编码方法。实验结果表明,这种方法大大提高了编码速度。
关键词 分形图像编码 迭代函数系统 图像编码 分形
下载PDF
吸引子在迭代系统中的作用 被引量:8
19
作者 林贻侠 朱铨范 +1 位作者 仲明瑜 刘煜 《上海大学学报(自然科学版)》 CAS CSCD 1999年第1期49-53,共5页
本文主要讨论吸引子在函数迭代系统(IFS)构成分形图中所起的作用.讨论了吸引子与IFS中伴随概率的关系,伴随概率可以调节各吸引子所起作用的强弱;着重讨论了吸引子在分形图平移变换和比例变换中的作用,提出了分形图平移变换... 本文主要讨论吸引子在函数迭代系统(IFS)构成分形图中所起的作用.讨论了吸引子与IFS中伴随概率的关系,伴随概率可以调节各吸引子所起作用的强弱;着重讨论了吸引子在分形图平移变换和比例变换中的作用,提出了分形图平移变换和比例变换的准则以及相应的计算步骤; 展开更多
关键词 吸引子 迭代函数系统 分形图 平移变换 比例变换
下载PDF
基于分形插值理论的径流预测探讨 被引量:12
20
作者 刘起方 马光文 +1 位作者 刘群英 杨道辉 《水力发电学报》 EI CSCD 北大核心 2008年第4期20-25,共6页
基于南桠河冶勒水库月平均径流资料,运用重标极差(R/S)分析方法揭示了径流复杂的非线性特性隐藏下的有序性,即持续性特性。由于持续性区间内径流变化的高度相关性,由此通过组织历史数据建立迭代函数系统,经分形插值方法求取吸引子并在... 基于南桠河冶勒水库月平均径流资料,运用重标极差(R/S)分析方法揭示了径流复杂的非线性特性隐藏下的有序性,即持续性特性。由于持续性区间内径流变化的高度相关性,由此通过组织历史数据建立迭代函数系统,经分形插值方法求取吸引子并在吸引子基础上进行延拓,建立了基于分形插值的预测模型。通过实际验证表明,该预测模型取得了较好的结果,满足实际应用要求,并为径流预测提供了新的探索及进一步研究的铺垫。 展开更多
关键词 水文学 径流预测 分形插值 迭代函数系统 R/S分析
下载PDF
上一页 1 2 18 下一页 到第
使用帮助 返回顶部