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扫描电子显微镜图像中粉煤灰珠状颗粒区域的自动提取 被引量:1
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作者 李莹莹 檀结庆 +1 位作者 钟金琴 李燕 《计算机应用》 CSCD 北大核心 2012年第6期1570-1573,共4页
针对扫描电子显微镜图像中粉煤灰区域的提取问题,提出了基于区域生长的珠状颗粒区域提取方法。该方法自动选取种子区域,在边界约束下按灰度相似度生长,生长区域结合形状特征提取目标。提取结果比对人工提取区域,提取误差用提取面积的错... 针对扫描电子显微镜图像中粉煤灰区域的提取问题,提出了基于区域生长的珠状颗粒区域提取方法。该方法自动选取种子区域,在边界约束下按灰度相似度生长,生长区域结合形状特征提取目标。提取结果比对人工提取区域,提取误差用提取面积的错分率和漏分率之和表示。实验的最小提取误差是6.8%,平均提取误差是8%,自动提取60张SEM图像的时间小于10 min。提取时间和误差均可达到估算粉煤灰含量的要求。 展开更多
关键词 扫描电子显微镜图像 粉煤灰 梯度 区域生长 自动提取
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基于FastICA的电子显微镜图像去噪研究
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作者 陈纯玉 《科技与创新》 2016年第14期11-12,共2页
提出了一种新的图像去噪方法。该方法适用于电子显微镜图像拍摄的生物大分子的投影图像。通过分析显微镜图像的特点,在ICA算法的基础上,使用改进的Fast ICA对图像中的噪声实现盲源分离,达到对图像去噪的目的。实验结果表明,利用该方法... 提出了一种新的图像去噪方法。该方法适用于电子显微镜图像拍摄的生物大分子的投影图像。通过分析显微镜图像的特点,在ICA算法的基础上,使用改进的Fast ICA对图像中的噪声实现盲源分离,达到对图像去噪的目的。实验结果表明,利用该方法能分离出组成图像的各个基图像,然后重组基图像,得到去噪以后的图像。分析实验结果发现,与Bayes Shrink、OWT_SURELER、SURE、BL-GSM方法相比,采用该方法获得的PSNR值分别提高了0.76%,2.33%,1.25%和2.21%,SSIM值分别提高了0.02,0.05,0.03和0.04.因此,该方法能有效提高显微镜图像的质量。 展开更多
关键词 图像去噪 电子显微镜图像 图像 FASTICA
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基于透射电子显微镜的沸石分子筛结构研究进展 被引量:7
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作者 凌旸 章冠群 马延航 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2021年第1期201-216,共16页
透射电子显微镜是解析沸石分子筛新结构、分析结构缺陷和研究活性位点等的有力工具.应用于分子筛研究的透射电子显微术总体上可以分为图像法和衍射法,包括透射电子显微镜和扫描透射电子显微图像、选区电子衍射和三维电子衍射,通常结合... 透射电子显微镜是解析沸石分子筛新结构、分析结构缺陷和研究活性位点等的有力工具.应用于分子筛研究的透射电子显微术总体上可以分为图像法和衍射法,包括透射电子显微镜和扫描透射电子显微图像、选区电子衍射和三维电子衍射,通常结合其中的几种方法进行分析.近年来,随着电子显微镜硬件性能的不断提升,特别是球差矫正器的广泛应用及各种适用于分子筛等电子束敏感材料的探测器和图像处理技术的不断革新,在原子尺度观察分子筛的结构已成为可能.此外,利用原位电子显微镜技术研究分子筛的生长和催化反应机理也在逐步展开.本文按电子显微镜方法分类,综述了近些年基于电子显微镜的分子筛研究,包括新结构解析、手性确认和金属负载等的最新进展. 展开更多
关键词 透射电子显微镜 分子筛结构 电子衍射 高分辨电子显微镜图像
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单视角SEM图像中操控工具的三维精确定位 被引量:1
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作者 李东洁 王德宝 +1 位作者 宋鉴 张越 《哈尔滨理工大学学报》 CAS 2014年第6期17-21,共5页
在基于扫描电子显微镜(SEM)的纳米操作系统中,针对获取多视角图像比较困难,而单视角图像缺乏三维信息的问题.为了研究如何从单视角SEM图像中快速的实现操作工具的三维精确定位,采用基于梯度方向高斯曲线拟合亚像素的定位方法来实现水平... 在基于扫描电子显微镜(SEM)的纳米操作系统中,针对获取多视角图像比较困难,而单视角图像缺乏三维信息的问题.为了研究如何从单视角SEM图像中快速的实现操作工具的三维精确定位,采用基于梯度方向高斯曲线拟合亚像素的定位方法来实现水平坐标信息的精确定位,和基于图像相似度的原理来精确获取操控工具的垂直坐标信息.从单视角SEM图像中获取的实验数据表明,水平坐标信息已达到了亚像素级别的精确定位要求,而垂直坐标信息也可以在小范围移动中进行精确定位. 展开更多
关键词 纳米操作 三维定位 扫描电子显微镜图像 图像相似度 亚像素边缘检测
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基于深度学习的TEM纳米材料图像识别与粒径统计 被引量:2
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作者 刘淑慧 姚丽英 +1 位作者 张仲圆 曾洁 《电子测量技术》 北大核心 2021年第10期109-113,共5页
对于催化材料,纳米颗粒的大小和形状等结构信息对催化性能有着重要的影响,基于透射电子显微镜图像的纳米颗粒识别与统计是获取这些信息的主要手段。本文提出一种基于深度学习的深度可分离卷积U-Net网络架构,以核壳结构纳米材料为数据集... 对于催化材料,纳米颗粒的大小和形状等结构信息对催化性能有着重要的影响,基于透射电子显微镜图像的纳米颗粒识别与统计是获取这些信息的主要手段。本文提出一种基于深度学习的深度可分离卷积U-Net网络架构,以核壳结构纳米材料为数据集,采用交叉熵损失函数、加权交叉熵损失函数、IoU损失函数和Dice损失函数作为优化目标,分别对网络进行训练。分割结果表明IoU损失函数和Dice损失函数在正负样本不均衡的核壳结构纳米颗粒数据集中性能较好。最后利用训练好的网络,对TEM图像分割且进行统计,获取粒径及周长分布等结构信息,为深度学习在催化材料领域的应用提供可行性。 展开更多
关键词 透射电子显微镜图像 深度可分离卷积U-Net 纳米颗粒识别 损失函数
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Effects of solution treatment on mechanical properties and microstructures of Al-Li-Cu-Mg-Ag alloy 被引量:4
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作者 YU Cheng YIN Deng-feng +1 位作者 ZHENG Feng YU Xin-xiang 《Journal of Central South University》 SCIE EI CAS 2013年第8期2083-2089,共7页
Mechanical properties and microstructures of Al-Li-Cu-Mg-Ag alloy after solution treatments were investigated by means of optical microscopy (OM), tensile test, hardness measurement and electrical conductivity test,... Mechanical properties and microstructures of Al-Li-Cu-Mg-Ag alloy after solution treatments were investigated by means of optical microscopy (OM), tensile test, hardness measurement and electrical conductivity test, differential scanning calorimetric (DSC), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and transition electron microscopy (TEM), respectively The results show that both tensile strength and hardness increase first and then decrease with temperature at constant holding time of 30 min with maximum strength and hardness appearing at 520 ℃. Tensile strength, hardness and elongation of samples treated at 520 ℃ for 30 min are 566 MPa (σb), 512 MPa (σ0.2), HB 148 and 8.23% (δ), respectively. There are certain amount of fine T1 (AI2CuLi) phase dispersing among AI substrates according to TEM images. This may result in mixed fracture morphology with trans-granular and inter-granular delamination cracks observed in SEM images. 展开更多
关键词 Al-Li-Cu-Mg-Ag alloy solution treatment microstructure mechanical properties
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Retrieving analog images from a scanning electron microscopewith a synchronous data acquisition method 被引量:1
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作者 BAI Jiang-hua 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2019年第4期329-334,共6页
In this work,an old scanning electron microscope(SEM)is refurbished to enhance its image processing capability.How to digitally sample and process an analog image is also presented.An NI PCI-6259 multiple input/output... In this work,an old scanning electron microscope(SEM)is refurbished to enhance its image processing capability.How to digitally sample and process an analog image is also presented.An NI PCI-6259 multiple input/output data acquisition(DAQ)board is used to acquire signals originally being sent to an analog display,and then convert the signals into a digital image.Two output channels are used for raster scan of the horizontal and verticle axes of the image buffer,while one input channel is used to read the brightness signals at various coordinate points.Synchronous method is used to maximize the DAQ speed.Finally,the digitally buffered images are read out to display and saved in a hard drive.The hardware and software designs of this work are explained in great detail,which can serve as a very good example for fast synchronous DAQ,advanced virtual instrument design and structural driver programming with LabVIEW. 展开更多
关键词 scanning electron microscope analog image display raster scan synchronous data acquisiotion(DAQ) LABVIEW
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Automatic recognition and quantitative analysis of Ω phases in Al-Cu-Mg-Ag alloy
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作者 刘冰滨 谷艳霞 +1 位作者 刘志义 田小林 《Journal of Central South University》 SCIE EI CAS 2014年第5期1696-1704,共9页
The main methods of the second phase quantitative analysis in current material science researches are manual recognition and extracting by using software such as Image Tool and Nano Measurer. The weaknesses such as hi... The main methods of the second phase quantitative analysis in current material science researches are manual recognition and extracting by using software such as Image Tool and Nano Measurer. The weaknesses such as high labor intensity and low accuracy statistic results exist in these methods. In order to overcome the shortcomings of the current methods, the Ω phase in A1-Cu-Mg-Ag alloy is taken as the research object and an algorithm based on the digital image processing and pattern recognition is proposed and implemented to do the A1 alloy TEM (transmission electron microscope) digital images process and recognize and extract the information of the second phase in the result image automatically. The top-hat transformation of the mathematical morphology, as well as several imaging processing technologies has been used in the proposed algorithm. Thereinto, top-hat transformation is used for elimination of asymmetric illumination and doing Multi-layer filtering to segment Ω phase in the TEM image. The testing results are satisfied, which indicate that the Ω phase with unclear boundary or small size can be recognized by using this method. The omission of these two kinds of Ω phase can be avoided or significantly reduced. More Ω phases would be recognized (growing rate minimum to 2% and maximum to 400% in samples), accuracy of recognition and statistics results would be greatly improved by using this method. And the manual error can be eliminated. The procedure recognizing and making quantitative analysis of information in this method is automatically completed by the software. It can process one image, including recognition and quantitative analysis in 30 min, but the manual method such as using Image Tool or Nano Measurer need 2 h or more. The labor intensity is effectively reduced and the working efficiency is greatly improved. 展开更多
关键词 auto pattern recognition top-hat transformation second phases in A1 alloy quantitative analysis
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Droplet Contact Angle Measurement on Microstructures of Octocoral Sclerites-ESEM Image Analysis
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作者 Barkay Zahava Golombick Roy +1 位作者 Yasmin Gabay Benayahu Yehuda 《Journal of Chemistry and Chemical Engineering》 2016年第1期42-47,共6页
This work explores the methodology for micron-scale water droplet contact angle derivation for the warty surface of octocoral sclerites. The calcite-made sclerites of the Red Sea octocoral Dendronephthya hemprichi hav... This work explores the methodology for micron-scale water droplet contact angle derivation for the warty surface of octocoral sclerites. The calcite-made sclerites of the Red Sea octocoral Dendronephthya hemprichi have been chosen as a model for this study. Water droplet condensation on the sclerites has been in-situ investigated using Quanta 200 FEG (field emission gun) ESEM (environmental scanning electron microscope) under wet environmental conditions. Two different analysis methods of droplet top and side views have been applied to determine the contact angle based on the secondary electron images. The ESEM image analysis for the sclerites indicates that their surface is hydrophilic. The microscopic contact angle is measured to be 45.3°±6.3°. The macroscopic contact angle has been calculated by using the Wenzel model for the surface texturing of the sclerites. 展开更多
关键词 DROPLET contact angle octocorals Dendronephthya hemprichi ESEM.
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基于深度学习的脑微观结构重建 被引量:7
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作者 谢启伟 陈曦 +3 位作者 沈丽君 李国庆 马宏图 韩华 《系统工程理论与实践》 EI CSSCI CSCD 北大核心 2018年第2期482-491,共10页
为了研究脑运行机制以实现类脑智能,我们引入深度学习工具系统解决突触级脑微观重建中大数据自动分析的难题,包括:密集神经元重建、单根神经元追踪、关键细胞器检测和重建.其中我们使用带有候选区域(region proposal network,RPN... 为了研究脑运行机制以实现类脑智能,我们引入深度学习工具系统解决突触级脑微观重建中大数据自动分析的难题,包括:密集神经元重建、单根神经元追踪、关键细胞器检测和重建.其中我们使用带有候选区域(region proposal network,RPN)的全卷积网络(fully convolutional networks,FCN)检测线粒体和突触,结合SPPUnet(spatial pyramid pooling U-net)网络框架和Multi-Cut算法进行神经元的重建,各部分在量化分析和视觉上取得了较好的结果.重建工作为学术界开展高通量的突触尺度脑微观结构重建提供有效支持. 展开更多
关键词 脑微观结构重建 电子显微镜图像 深度学习 候选区域网络
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Applications of scanning electron microscopy in earth sciences 被引量:7
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作者 CHEN Li XU Jun CHEN Jing 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第10期1768-1778,共11页
This paper expounds upon the basic principle of scanning electron microscopy(SEM),the main features of image types,and different signals,and the applications and prospects in earth sciences research are reviewed.High-... This paper expounds upon the basic principle of scanning electron microscopy(SEM),the main features of image types,and different signals,and the applications and prospects in earth sciences research are reviewed.High-resolution field emission SEM allows observation and investigation of a very fine micro area in situ.Using low-vacuum mode SEM,geological insulating samples can be analyzed directly without coating,demonstrating the wide application prospect.Combined with backscatter detector(BSE),energy dispersal X-ray spectroscopy(EDS),cathodoluminescence spectrometry(CL),and electron back-scattering diffraction(EBSD),SEM can yield multiple types of information about geological samples at the same time,such as superficial microstructure,CL analysis,BSE image,component analysis,and crystal structure features.In this paper,we use examples to discuss the geological application of SEM.We stress that we should not only focus on the CL image analysis,but strengthen CL spectrum analyses of minerals.These results will effectively reveal the mineral crystal lattice defects and trace element composition and can help to reconstruct mineral growth conditions precisely. 展开更多
关键词 scanning electron microscopy signal detector MINERALS
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Occurrence, Structure and Mineral Phases of Nanoparticles in an Anthrosol
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作者 LU Sheng-Gao SUN Fang-Fang ZONG Yu-Tong 《Pedosphere》 SCIE CAS CSCD 2013年第3期273-280,共8页
Soils contain various kinds of crystalline to amorphous solid particles with at least one dimension in the nanoscale (〈 100 nm). These nanoparticles contribute greatly to dynamic soil processes such as soil genesis... Soils contain various kinds of crystalline to amorphous solid particles with at least one dimension in the nanoscale (〈 100 nm). These nanoparticles contribute greatly to dynamic soil processes such as soil genesis, trace element cycling, contaminant transport, and chemical reaction. The nano-sized fraction of an Anthrosol was obtained to determine the occurrence, chemical composition, structure, and mineral phases of nanoparticles using high-resolution transmission electron microscopy (HRTEM) equipped with an energy-dispersive X-ray spectroscopy. Selected area electron diffraction or the fast Fourier transform of high-resolution images was used in structural characterization of the nanoparticles with HRTEM. Two nanoscale mineral types, i.e., mineral nanoparticles and nanomi- nerals, were observed in the Anthrosol. Mineral nanoparticles in soil included well crystalline aluminumsilicate nanosheets, nanorods, and nanoparticles. Nanosheets with a length of 120-150 nm and a width of about 10-20 nm were identified as chlorite/vermiculite series. The presence of clear lattice fringe spacing in HRTEM image of nanoparticles indicated that mineral nanoparticles had a relatively good crystallinity. The nanomineral ferrihydrite also existed in the Anthrosol. The HRTEM images and the particle size distribution histogram suggested that these ferrihydrite nanoparticles were quite homogeneous, and had a narrow size distribution range (1-7 nm) with a mean diameter of 3.6 4- 1.6 nm. Our HRTEM observation indicated that mineral nanoparticles and nanominerals were common and widely distributed in Anthrosols. HRTEM and selected area diffraction or lattice fringe spacing characterization provided further proofs to the structure of nanoparticles formed in soil. 展开更多
关键词 energy-dispersive X-ray spectroscopy (EDS) FERRIHYDRITE high-resolution transmission electron microscopy (HRTEM) nanominerals nano-sized fraction
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Preparation of nano-porous AlN micro-rods
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作者 YAN GuoJun LIU XiaoLi +3 位作者 CHEN GuangDe JIANG BaiLing LI Feng LIU HanCh-en 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第6期1523-1526,共4页
In this paper, nano-porous A1N micro-rods were prepared and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emett-Teller (BET) met... In this paper, nano-porous A1N micro-rods were prepared and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emett-Teller (BET) method of nitrogen adsorption at low temperature, UV-via absorption spectrometry and Raman spectrometry. The SEM images and TEM images showed that the A1N samples were micro-size rods with pores in their surfaces evenly. The length of the rod was in the range of a few mi- crons to tens of micron, the diameter of the rods was about one micron, the diameter of the pore was about hundreds of nano- meter and the wall thickness of the pore about tens of nanometer. The BET surface area of the sample was 41.424 ma/g. The optical spectra showed that the optical properties of the A1N samples almost agreed with that of A1N bulk or film. 展开更多
关键词 porous AIN micro-rods PREPARATION
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