According to characteristics of medical images,in order to find more suited algorithms for estimating the standard variance,this paper presented a novel algorithm to estimate noise standard variation by fuzzy mean error instead of variance.
针对医学图像的特点、基于寻找更合适的噪声标准差估计方法,本研究提出了一种新的利用模糊均差代替普通标准方差估计噪声标准差的方法。
Based on the analysis of interpolation errors,one calculation algorithm is brought forward,the mathematical model of mean deviation method is established and is applied to DDA and DT interpolation method to calculate interpolation errors and calculation time.
插补计算是数控系统最重要的运算工作,如何正确地选用插补算法,以保证插补运算的实时性和精度是开发数控系统的关键;通过对插补误差的分析,提出一种计算插补误差的算法———均差法,建立了均差法的数学模型,并利用均差法计算出DDA插补和时间分割插补的误差及插补计算时间。
Range,average deviation and standard deviation are the three indices of variability that statisticians use to characterize the dispersion among the measures in a given population.
极差(R)、平均差(AD)和标准差(δ)是描述离散程度所采用的三个测度值,通过证明,三者之间存在着R≥δ≥AD≥0的关系式。