نتایج جستجو برای: fractal dimension

تعداد نتایج: 133816  

2017
Yi Jin Ying Wu Hui Li Mengyu Zhao Jienan Pan

Fractal behavior is scale-invariant and widely characterized by fractal dimension. However, the cor-respondence between them is that fractal behavior uniquely determines a fractal dimension while a fractal dimension can be related to many possible fractal behaviors. Therefore, fractal behavior is independent of the fractal generator and its geometries, spatial pattern, and statistical propertie...

Journal: :J. Visual Communication and Image Representation 1998
Pantelis A. Asvestas George K. Matsopoulos Konstantina S. Nikita

other fractal-based features as descriptors of the texture of images [2–6]. Applications of the fractal theory in image Fractal dimension has been used for texture analysis as it is highly correlated with the human perception of surface analysis also include image segmentation [2, 6–8], shape roughness. Several methods have been proposed for the estimadescription [9], object characterization [1...

Journal: :Applied Mathematics and Nonlinear Sciences 2016

2006
George W. Rogers Jeffrey L. Solka

A parallel distributed processing approach to the computation of localized fractal dimension values in imagery is presented. This approach is a further development of the covering method which requires only nearest neighbor communication. A major benefit of our approach is the ability to readily incorporate any boundary information that may be available. Man y fractal textures or surfaces are f...

2014
B. N. J. Persson

Most natural surfaces and surfaces of engineering interest, e.g., polished or sandblasted surfaces, are self-affine fractal over a wide range of length scales, with the fractal dimension Df 1⁄4 2:15 0:15. We give several examples illustrating this and a simple argument, based on surface fragility, for why the fractal dimension usually is \2.3. A kinetic model of sandblasting is presented, which...

2016
Howard A. Crystal Susan Holman Yvonne W. Lui Alison E. Baird Hua Yu Ronald Klein Diana Marcella Rojas-Soto Deborah R. Gustafson Glenn T. Stebbins

OBJECTIVE The fractal dimension of retinal arteries and veins is a measure of the complexity of the vascular tree. We hypothesized that retinal fractal dimension would be associated with brain volume and white matter integrity in HIV-infected women. DESIGN Nested case-control within longitudinal cohort study. METHODS Women were recruited from the Brooklyn site of the Women's Interagency HIV...

2014
Pavel Tuček Zbyněk Janoška

The objective of this paper is to examine the development of the urban form of the city of Olomouc since the 1920s in terms of fractal dimension, and to link the observation with two other descriptors of shape – area and perimeter. The fractal dimension of built-up areas and fractal dimension of the boundary of the city are calculated employing the box-counting method; the possibilities of thei...

Journal: :Journal of applied physiology 2000
S E Sinclair S McKinney R W Glenny S L Bernard M P Hlastala

We determined the changes in fractal dimensions and spatial correlations of regional pulmonary blood flow with increasing exercise in race horses (n = 4) by using 15-microm fluorescent microspheres. Fluorescence was measured to quantitate regional blood to 1.3-cm(3) samples (n = 1,621-2,503). Perfusion distributions were characterized with fractal dimensions (a measure of spatial variability) a...

2008
Hongju Gong Hua Li Haiming Yu Changying Ji

Paddy is one of major crops grown in China. Fractal dimension is an important parameter used to describe geometrical characteristics of many natural objects. The objective of this study is to investigate mathematical relationships between the fractal dimension and the yield of the paddy spike based on the fractal theory and the image processing technologies. The color images of paddy spikes wer...

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