一种简单的图像脉冲噪声滤除方法

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。     

Three-dimensional tracking of GLUT4 vesicles in TIRF microscopy

TIRF microscopy has provided a means to view mobile granules within 100 nm in size in two dimensions. However quantitative analysis of the position and motion of those granules requires an appropriate tracking method. In this paper, we present a new tracking algorithm combined with the unique features of TIRF. Firstly a fluorescence correction procedure was processed to solve the problem of fluorescence bleaching over time. Mobile granules were then segmented from a time-lapse image stack by an adaptive background subtraction method. Kalman filter was introduced to estimate and track the granules that allowed reducing searching range and hence greater reliability in tracking process. After the tracked granules were located in x-y plane, the z-position was indirectly inferred from the changes in their intensities. In the experiments the algorithm was applied in tracking GLUT4 vesicles in living adipose cells. The results indicate that the algorithm has achieved robust estimation and tracking of the vesicles in three dimensions.     

Evaluation and application of an efficient plant DNA extraction protocol for laboratory and field testing

Nucleic acids in plant tissue lysates can be captured quickly by a cellulose filter paper and prepared for amplification after a quick purification.In this study,a published filter paper strip method was modified by sticking the filter paper on a polyvinyl chloride resin(PVC)sheet.This modified method is named EZ-D,for EASY DNA extraction.Compared with the original cetyl trimethylammonium bromide(CTAB)method,DNA extracted by EZ-D is more efficient in polymerase chain reaction(PCR)amplification due to the more stable performance of the EZ-D stick.The EZ-D method is also faster,easier,and cheaper.PCR analyses showed that DNA extracted from several types of plant tissues by EZ-D was appropriate for specific identification of biological samples.A regular PCR reaction can detect the EZ-D-extracted DNA template at concentration as low as 0.1 ng/μL.Evaluation of the EZ-D showed that DNA extracts could be successfully amplified by PCR reaction for DNA fragments up to 3000 bp in length and up to 80%in GC content.EZ-D was successfully used for DNA extraction from a variety of plant species and plant tissues.Moreover,when EZ-D was combined with the loop-mediated isothermal amplification(LAMP)method,DNA identification of biological samples could be achieved without the need for specialized equipment.As an optimized DNA purification method,EZ-D shows great advantages in application and can be used widely in laboratories where equipment is limited and rapid results are required.     

河南农民收入增长的波动周期

河南农民人均收入时间序列,服从二阶单整过程,期间存在结构性断点,适合建立H—P滤波模型。自改革开放以来可划分为三个增长周期,其在不同的历史阶段具有明显不同的波动特征。     

宽阻带小型化低通滤波器的设计

This paper presents a novel low-pass filter （LPF） with sharp rejection, wide stopband and compact size, which are realized by the defected ground structure （DGS） and the defected microstrip structure （DMS）. The equivalent circuit model is proposed and the circuit parameters are extracted by the circuit simulation software. The parameters measured are 3 dB cutoff frequency fc of 5.2 GHz, the insertion loss less than 0.5 dB from DC to 4.0 GHz and S21 less than -20 dB within the wide stopband from 6 GHz to 16 GHz. The results of the circuit optimization agree well with those of the full wave simulation and the measured ones, which validate the effectiveness of the equivalent circuit model. The size of the proposed LPF is decreased compared with normal LPF. This LPF can be applied in rectennas to eliminate high order harmonics.     

汽车底盘智能化总布置及其关键技术

采用CAD软件实现汽车底盘的装配设计已广泛应用，本文详细的阐述了采用自项向下的设计思路，参数化的零部件设计和依靠零部件之间的配合关系来实现底盘的智能化装配的原理和实现方法。初步实现了对底盘总布置的快速智能设计。     

辞格的比较、分析和确定--从引用和仿拟的区别说起

随着现代社会话语交际水平的提高,近年来,汉语交际中出现了很多颇为新颖的言语形式,极大地丰富了汉语辞格的内容,但同时也给人们比较、分析和确定辞格增加了难度.因此,根据一定的原则,对辞格进行比较、分析和确定,对维护辞格系统的纯洁,具有重要的意义.比较、分析和确定辞格应该遵循的原则是:修辞效果原则、特定格式原则、特殊方法原则.语境是比较、分析和确定辞格的总的依据.     

自适应信号处理技术在IP电话技术中的应用探讨

本文简要介绍了自适应系统结构、特征,阐述了目前IP电话技术及存在问题,主要对利用自适应信号处理技术来解决IP电话技术系统中的回声问题作了一些探讨。     

一种结合深度特征的人体运动序列追踪模型

目前主流的判别式目标跟踪模型大多使用灰度、颜色等手工特征,在目标快速移动或受到视频序列背景等因素干扰情况下,目标跟踪器可能在跟踪目标时学习到错误特征而导致跟踪失败。因此,提出一种结合深度特征的相关滤波跟踪算法。首先将待跟踪目标图像输入至卷积神经网络中,提取出较高层的卷积特征,然后将提取的卷积特征输入相关滤波器中得到响应,最后根据响应峰值得到追踪结果。以VOT2016中包含人体运动的视频序列为实验数据集,并分别与CN、SAMF及KPDCF模型进行对比。实验结果表明,结合深度特征的相关滤波算法具有较好的追踪性能,在不大幅降低追踪速度的情况下,提升了追踪精度和稳定性。     

一种滤除基线漂移和工频干扰的数字滤波算法

介绍了一种用于心电监护的数字滤波算法，对滤波器的设计，包括滤波原理、整系数数字滤波器的波型特征、实现方框图及10点平均数字滤波器进行了分析，并给出心电信号的滤波效果图。实验结果表明，该算法能有效滤除基线漂移和工频干扰，算法简单实用。