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A novel adaptive switching filter (ASF) based on directional detection is proposed for denoising the images that are highly corrupted by impulse noise. The proposed algorithm employs an efficient noise detection mechanism. It first employs an efficient method to estimate the differences between the current pixel and its neighbors aligned with 28 directions. The current noise pixel is replaced by a median or a mean value within an adaptive filter window with respect to different noise densities. Experimental results show that the proposed approach can not only achieve very low miss-detection ratio and false-alarm ratio even up to high noise corruption, but also preserve the detailed information of an image very well. 相似文献
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本文以自制的Fe基含硼合金作催化剂,石墨片作碳源,压力和温度分别为5.3GPa和1570K条件下,在六面顶压机上合成了0.6mm左右的含硼金刚石晶体.利用X射线衍射仪(XRD)分析了金刚石晶体的结构,证明金刚石是六方结构的.在光学显微镜下观察了金刚石的晶形,利用透射电子显微镜(TEM)和能谱仪(EDS)对金刚石晶体进行了微观分析,发现了多种含硼包裹物,包括(Fe,Ni)23(C,B)6,(Fe,Ni)3(C,B),(Fe,Ni)B,(Fe,Ni)2B,Ni3B,B4C等.研究了它们的化学组成与微观结构,并分析了含硼包裹物的来源与形成过程.结合金刚石的生长过程分析认为,合金触媒是金刚石中包裹物元素的主要来源,通过调整触媒的成份和含量可以控制金刚石内杂质元素的种类.硼元素在金刚石中既可以以化合物的形式存在,也可以替代碳原子存在于金刚石内. 相似文献
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今天,移动电子设备制造商正面临着一系列的竞争和挑战。为了继续生存,他们必须提供具有更多功能和更高性能的设备,为此必须降低功耗、尺寸和成本。 相似文献
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