An image retrieval system based on fractal dimension

INTRODUCTIONWiththerapiddevelopmentofthetechnologyofimagecollection ,storage,processionanddis play,digitalimagesarewidelyused (Zhangetal.,2 0 0 1 ) .However,itisdifficulttomanageahugeimagedatabase ,sothestudyoftheimagedatabasemanagementsystemandtheimagein…     

混沌模型的分析与算法实现

本文主要从基本知识、算法分析和具体编程实现等方面介绍了混沌的著名模型-人口方程，从而阐述了混沌的思想和性质，并简要介绍了混沌与分形的关系。     

花岗石磨抛表面粗糙度及光泽度与分形维数关系的研究

阐述了花岗石表面轮廓的特点,提出对原始轮廓曲线进行高斯滤波,然后进行粗糙度及分形计算的方法:并对花岗石表面光泽度和粗糙度、分形维数之间的关系进行了研究.通过分析认为高斯滤波适合花岗石表面轮廓的粗糙度及分形研究,计算方法可靠、简捷.     

Characterization of surface EMG signals using improved approximate entropy

An improved approximate entropy （ApEn） is presented and applied to characterize surface electromyography （sEMG） signals. In most previous experiments using nonlinear dynamic analysis, this certain processing was often confronted with the problem of insufficient data points and noisy circumstances, which led to unsatisfactory results. Compared with fractal dimension as well as the standard ApEn, the improved ApEn can extract information underlying sEMG signals more efficiently and accurately. The method introduced here can also be applied to other medium-sized and noisy physiological signals.