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基于彩色图像人们已经提出了很多噪声的滤波方法,这些方法主要是为了平滑去除噪声、保留图像的边缘和细节信息.但可以看到很多滤波方法为了保存图像的边缘和细节信息而在图像的平坦区域产生了不必要的噪声;反之,也有很多滤波方法在去除图像平坦区的噪声的同时也去除了重要的图像边缘和细节等信息.因此本文率先提出了一种改进的滤波方法,用算术均值滤波器(AMF)、矢量中值滤波器(VMF)两种彩色图像矢量滤波方法有机结合来实现图像滤波,试验证明该方法可以很好的克服前面滤波方法的不足,不但很好的保存了边缘和细节信息,而且还在平坦区域有很好的滤波作用,在抑制噪声和保留细节之间达到了一个很好的平衡. 相似文献
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The validity of the application of the Krylov subspace techniques in adaptive filtering and detection is investigated. A new verification of the equivalence of two well-known methods in the Krylov subspace, namely the multistage Wiener filters (MWF) and the auxiliary-vector filtering (AVF), is given in this paper. The MWF and AVF are incorporated into two well-known detectors, namely, the adaptive matched filter (AMF) and Kelly's generalized likelihood ratio test (CLRT) including their diagonally loaded versions, which form new detectors. Compared to the conventional AMF, CLRT, and their diagonally loaded versions as well as the reduced-rank AMF and GLRT, the probabilities of detection (PDs) of the new detectors are improved especially when the sample support is low. More importantly, the new detectors are robust of the rank selection of the clutter subspace compared to the reduced-rank AMF and GLRT. These new detectors all possess asymptotic constant false alarm rate (CFAR) property. 相似文献
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基于Flex的RIA与J2EE应用的整合 总被引:1,自引:0,他引:1
为了将基于Flex的RIA应用于J2EE,以现有的J2EE框架Struts,Spring,Hibernate为基础,分析了Flex和J2EE框架中各层整合的有效性和实用性,并以Flex与J2EE业务层的整合模犏发了Flex与J2EE整合的实例,验证了Flex与J2EE整合的可行性,提出了Flex与J2EE整合的合理方案。 相似文献
4.
为探讨不同丛枝菌根真菌(Arbuscular Mycorrhizal Fungi,AMF)在白三叶草坪扶壮中的作用,选用摩西球囊霉、根内球囊霉两种广适菌种,分别研究单菌、混菌对白三叶草的促进作用.结果表明:单独施加摩西球囊霉对植物的侵染率最高,达53.84%;白三叶草对混菌的依赖性最强,并且植物地上器官依赖性高于地下;AMF可明显提高白三叶草坪的扶壮率,混菌效果优于单菌,株高、地上及地下生物量的扶壮率可分别增加40.7%、76.6%、35.7%;AMF可有效增强白三叶草对根际土壤中营养物质的吸收能力,水解性氮、有效磷利用率提高51.6%、48%.水解性氮是影响AMF促进白三叶生长的主要限制因子,施加菌剂时,无需补充磷肥,但可补充少量氮肥. 相似文献
5.
Marta Lubary Theo W. de LoosJoop H. ter Horst Gerard W. Hofland 《The Journal of Supercritical Fluids》2011,55(3):1079-1088
The ScMM (Supercritical Melt Micronization) process was applied for the production of microparticles from anhydrous milk fat (AMF) and a diacylglycerol-based modified milk fat (D-AMF). Both fats were able to dissolve ca. 30 wt% CO2 in the studied pressure and temperature ranges, being the CO2 amount slightly higher for AMF. A melting point depression was observed in both systems in the presence of CO2. Two powder morphologies were obtained (spherical hollow particles and a mass sponge-like broken particles) depending on the ScMM process conditions. The concentration of CO2 in the fat melt was the main process variable affecting the particle morphology, followed by the temperature of the melt. The small broken particles originated from the breakage of spherical fat particles that solidified before all CO2 could escape from the atomized droplets. While the hollow spheres had a tendency to agglomerate, the broken microparticles constituted a free-flowing powder as long as they were stored at low temperatures (up to −18 °C). Both types of particles have a potential for being incorporated in refrigerated or frozen food products as a structuring agent. 相似文献
6.
真空电弧磁流体动力学模型与仿真研究 总被引:3,自引:11,他引:3
以离子与电子的双流体模型以及麦克斯韦方程为基础,推导得到了真空电弧的二维磁流体动力学(MHD)模型。MHD模型中包括质量方程、动量方程、能量方程、麦克斯韦方程和全欧姆定律,通过对这些方程的数值计算,得到了真空电弧等离子体参数与电流密度的分布,文中计算分析了电弧电流、电极间距以及不同分布的纵向磁场对真空电弧等离子体参数与电流密度的影响。 相似文献
7.
集群服务的有效性已经成为集群系统中重要的组成部分.目前,人们主要通过提高集群系统的恢复能力来达到系统服务的有效性,实现方式多为硬件意义上的资源的冗余.研究了基于集群系统上的多种冗余模型,并对这些模型进行比较分析. 相似文献
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H. Sun N.P. Hankins B.J. Azzopardi N. Hilal C.A.P. Almeida 《Separation and Purification Technology》2008,62(2):273-280
A pilot-plant scale study of the adsorptive micellar flocculation (AMF) process is presented for the first time, and builds on the solid foundation provided by previous fundamental laboratory studies. A number of experimental tests were conducted to validate the feasibility of using an AMF pilot rig to remove phenol from aqueous effluent streams. Several key factors, including flocculation time, floc settling time, optimum air flow-rate for agitation, and flocculant dosage, were determined. Residual concentrations in treated water indicated a surfactant removal efficiency of 95–98%, and pollutant removal reached 78% in two stages of process operation. A strategy for the separate recycling of surfactant, flocculant and pollutant has already been developed. The present study has thus made further progress in developing, testing, validating and optimising the operating conditions of a pilot-scale process. As such, it has demonstrated the feasibility of scaling up from the bench-scale to a commercial, continuously operated unit. 相似文献
10.
In a first experiment of soil contaminated with 137Cs, inoculation with a mixture of arbuscular mycorrhizae enhanced the uptake of 137Cs by leek under greenhouse conditions, while no effect on the uptake by ryegrass was observed. The mycorrhizal infection frequency in leek was independent of whether the 137Cs-contaminated soil was inoculated with mycorrhizal spores or not. The lack of mycorrhizae-mediated uptake of 137Cs in ryegrass could be due to the high root density, which was about four times that of leek, or due to a less well functioning mycorrhizal symbiosis than of leek. In a second experiment, ryegrass was grown for a period of four cuts. Additions of fungi enhanced 137Cs uptake of all harvests, improved dry weight production in the first cut, and also improved the mycorrhizal infection frequencies in the roots. No differences were obtained between the two fungal inoculums investigated with respect to biomass production or 137Cs uptake, but root colonization differed. We conclude that, under certain circumstances, mycorrhizae affect plant uptake of 137Cs. There may be a potential for selecting fungal strains that stimulate 137Cs accumulation in crops. The use of ryegrass seems to be rather ineffective for remediation of 137Cs-contaminated soil. 相似文献