计算极限的方法再探     

丁玉敏  马长胜 《蒙自师范高等专科学校学报》2002,4(6):36-42

本文在文献 [1]的基础之上 ,经不断探索又归纳出十五种计算极限的方法 ,权作再续  相似文献   

Some Problems of 2D Morphological and Median Filters     

朱广进  李介谷 《上海大学学报(英文版)》1997,1(3):245-248

lintroductionMOrpnologicalandnlediantiltersasaclassofnonlineardiscretetilters11avegotWideapplicationsinsignalandimageprocessing.Incontrastwithlinearfilters,medianfiltersandtheirgenerationsareattractivebecausetheyareeasytoimplenlentandcansuppressimpulsenoi…  相似文献   

O-200kPa气动控制信号检测系统的设计     

黄爱芹 《滨州师专学报》2011,(6):91-94

为检测气动执行器常用控制信号0-200kPa气压,设计了基于MSP430单片机和压阻式压力传感器MPX2200的气压检测系统．阐述了检测系统的软硬件设计,给出了MPX2200恒流源电路和放大倍数可调的两级放大电路,介绍了软件设计中的标度变换、分段插值和中值滤波方法．该系统在电路设计上选用仪用放大器、单片机自带AD转换器,所用元器件少、功耗低、精度高,可广泛应用于智能化、低功耗化的气动执行机构及其元器件的设计中．  相似文献   

基于中值滤波和维纳滤波的图像混合噪声滤波研究   总被引：1，自引：0，他引：1  

杨辉  唐建锋  杨利容  许岳兵 《衡阳师范学院学报》2011,32(6):52-55

某一种去噪方法通常只对某一类噪声的滤除较为有效,为了抑制混合噪声,提出一种结合中值滤波与维纳滤波的图像去噪算法。该算法首先检测出脉冲噪声点,并对脉冲噪声点进行中值滤波处理,然后用维纳滤波滤除图像中的高斯白噪声。仿真实验表明,对于被高斯、脉冲混合噪声污染的图像,该算法的去噪效果显然比单一的中值滤波和维纳滤波好得多。  相似文献   

基于最值中滤波的彩色图像噪声滤波器     

李葆青  文山 《六盘水师范高等专科学校学报》2003,15(4):19-21

构建了一种新的消除彩色图象中脉冲噪声的滤波法。该滤波首先根据极值点(最大或最小)的判别标准将全部像素分为两类(信号S与噪声N),再根据空间相关性将噪声点用该点邻域的中值取代,然后进行简单的局部纹理分析而自动选择使用标量中值滤波或者使用矢量中值滤波。实验表明,文中提出的方法计算量少,性能优良,图象信噪比高。  相似文献   

简约性，极性分析及中值淘汰法——与李朝銮先生商榷     

张奠湘 《中国科学院研究生院学报》1991,29(3):283-287

 无论是从理论基础上还是具体步骤上，中值淘汰法与分支学家常用的方法都不相同。在构建分支图之前识别祖征与反向进化，直接衍征与环极向衍征有悖于分支学的基本原则；而在具体运算过程中仅以2个分类单元求取中值又会掩盖反向进化；新的中值必须全部包括分支图上下面的中值的原则事实上是不承认反向进化。中值淘汰法产生的分支图不及Farris方法产生的分支图简约。  相似文献   

Direction-Based Adaptive Switching Filter for Removing High-Density Impulse Noise     

刘会刚  孙菁  张福海  任立儒 《天津大学学报(英文版)》2014,(6):422-428

A direction-based adaptive switching(DBAS) filter is presented for the removal of high-density impulse noise in images. The extrema detection and 28-directional detection are employed to discriminate the pixels as noisy or noise-free. If a pixel is classified as noisy, it will be replaced by a median or a mean value within an adaptive filter window with respect to different noise densities. Simulation results show that the miss-detection ratio and false-alarm ratio are both very low even at noise level as high as 90%. At the same time, better results are obtained in terms of the qualitative and quantitative measures. The peak signal-to-noise ratios increase by nearly 1 dB compared with other existing algorithms. In addition, the computation time is around 10 s for test images with resolutions of 512×512since the proposed approach has low complexity.  相似文献   

Impact of combining data from multiple instruments on performance of patient-based real-time quality control     

Qianqian Zhou  Tze Ping Loh  Tony Badrick  Chun Yee Lim 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2021,31(2)

IntroductionIt is unclear what is the best strategy for applying patient-based real-time quality control (PBRTQC) algorithm in the presence of multiple instruments. This simulation study compared the error detection capability of applying PBRTQC algorithms for instruments individually and in combination using serum sodium as an example.Materials and methodsFour sets of random serum sodium measurements were generated with differing means and standard deviations to represent four simulated instruments. Moving median with winsorization was selected as the PBRTQC algorithm. The PBRTQC parameters (block size and control limits) were optimized and applied to the four simulated laboratory data sets individually and in combination.ResultsWhen the PBRTQC algorithm were individually optimized and applied to the data of the individual simulated instruments, it was able to detect bias several folds faster than when they were combined. Similarly, the individually applied algorithms had perfect error detection rates across different magnitudes of bias, whereas the error detection rates of the algorithm applied on the combined data missed smaller biases. The performance of the individually applied PBRTQC algorithm performed more consistently among the simulated instruments compared to when the data were combined.DiscussionWhile combining data from different instruments can increase the data stream and hence, increase the speed of error detection, it may widen the control limits and compromising the probability of error detection. The presence of multiple instruments in the data stream may dilute the effect of the error when it only affects a selected instrument.  相似文献   

锐角三角形中线与角平分线的几个不等式     

刘健 《湖州师范学院学报》2008,30(1):29-32

应用三角形不等式中重要的R-r-s方法,证明了锐角三角形的中线与内角平分线的两个不等式,提出了两个未解决的猜想不等式.  相似文献   

一种简单的图像脉冲噪声滤除方法     

陈月芬  洪丹丹 《台州学院学报》2008,30(6):25-28

针对传统的中值滤波法消除脉冲噪声时存在的缺陷,充分利用脉冲噪声的特征,提出了一种简单的噪声像素检测方法,在滤波处理前先检测像素是否被脉冲噪声污染,从而有选择地对噪声进行自适应中值滤波,该算法不仅能够有效滤除脉冲噪声,而且具有较少的计算量和较高的峰值信噪比。仿真结果证明了算法的有效性。  相似文献