共查询到19条相似文献,搜索用时 46 毫秒
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针对红外图像中的特征点匹配问题,本文选取了一种基于人工智能技术的红外图像特征点匹配算法和一种基于比例不变的特征转换方法,运用梯度直方图的方法来实现特征点的提取;在此基础上,利用最近邻搜索算法获得特征点的特征矢量,求出查询特征向量与原点之间的欧式距离,搜索特征矢量的最近邻点;并随机取样一致性算法消除了错误的匹配。试验结果表明:此方法的特征点提取率在0.5%以上,且具有良好的提取稳定性;能对红外图像的特征点进行有效的匹配,提高了图像的清晰度;当转动角与光照比的情况下,该方法可以使图像的灰度分布更为均匀,同时也能增加图像的信息量。 相似文献
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针对用KD-tree实现高维空间点匹配中存在的错误匹配问题进行讨论,分析其存在的原因;接着,使用PCA,根据各维数之间的协方差,求出它们的主成分奉献率,再按主成分奉献率进行维数优先级排序,并在该基础上增加了KD-tree各节点的权重;最后,将改进前后的KD-tree应用于Sift特征点匹配。实验证明,改进后的KD-tree能在保持实时性的前提下,大大提高匹配的准确率。 相似文献
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特征点提取作为影像匹配的基础环节,直接决定着低空摄影测量遥感影像的精确程度.文章通过研究5种特征点提取算法,目的在于检测不同特征点提取算法的优劣性,从而有助于提高低空摄影测量遥感影像特征点提取的效果.实验结果表明,基于灰度信息丰富的低空遥感影像,Forstner特征点提取算法的精度最高,而检测时间最长;SIFT具有尺度... 相似文献
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本文将Kanade-Lucas-Tomasi(KLT)特征点跟踪算法和人脸特征点定位的统计模型Active Shape Model(ASM)结合起来,提出了视频中人脸特征点定位与跟踪的一种混合模型方法。 相似文献
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注塑机的振动及模具归位不准等原因容易造成目标图像与样本图像间的偏移,从而引起模具监视系统产生误检和误报.为此,提出一种基于尺度不变特征变换描述子的实时图像配准算法.该算法采用一种快速角点检测算法提取图像关键点,围绕关键点构建128维描述子,依据最近邻匹配法得到特征匹配对,最后通过随机采样一致性(RANSAC)和最小二乘法剔除误配点并拟合变换参数.最后,用实验证明了该算法的有效性. 相似文献
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Mengqi Fang Aurélien Sibellas James Drummond Yankai Cao Andre Phillion Mark Martinez Vijay Kumar Pediredla Bhushan Gopaluni 《加拿大化工杂志》2023,101(12):6817-6826
3D x-ray tomography is a powerful scanning technique used for generating images of complex fibre structures. A novel machine-learning algorithm to identify and separate individual fibres using 3D images is proposed in this article. The developed four-step hybrid 3D fibre segmentation algorithm involves deep-learning aided semantic segmentation that slices 3D images to create 2D images for fibre extraction, elliptical contour estimation combined with the marker-controlled watershed algorithm for separating fibres from the background area, identifying individual fibres through 3D reconstruction, and, lastly, the 3D object refining approach based on outlier object detection and replacement. The proposed methodology is implemented on a real-time sample of nylon fibre bundle under compression and its 3D x-ray image volume to validate the performance. The results show its superior performance compared to off-the-shelf image processing algorithms in terms of precision, that is, with a validation accuracy greater than 90%, and efficiency, that is, preventing the need for a huge data set and reducing the complexity. 相似文献
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Angélique Léonard Cedric Calberg Greet Kerckhofs Martine Wevers Robert Jérôme Jean-Paul Pirard Albert Germain Silvia Blacher 《Journal of Porous Materials》2008,15(4):397-403
Poly(ε-caprolactone) foams were prepared, via a batch process, by using supercritical CO2 as foaming agent. Their porous structure was characterized through mercury porosimetry, helium and mercury pycnometry, scanning electron microscopy (SEM) and X-ray microtomography observations coupled with image analysis. The pore size distributions obtained by these two latter techniques show that the pore structure is more homogeneous when the foaming process is performed under a high CO2 saturation pressure (higher than 250 bars). 相似文献
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在PC机上利用Origin6.0软件的三维离散数据绘图功能,构造分别属于D2rl和D3rl分子点群的丙二烯和椅式环己烷三维结构模型.给出了模型在不同平面上的投影图和各对称元素的分布。 相似文献
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基于Imageware和UG技术的逆向曲面重构及模具设计方法 总被引:1,自引:0,他引:1
摘要:采用逆向辅助技术,对一款结构较为复杂的某制品进行快速而精确的模具设计,先利用三维激光扫描仪得到其点云数据,再使用Imageware软件进行点云处理和曲面重构,然后在UG软件中进行三维造型及相应的优化设计,最终以最合理的设计方法得到完整的模具图,用于后续的模具加工与生产。结果表明,此方法既能提高模具及产品的精度,又能大大缩短设计周期,节约成本。尤其对一些具有结构复杂、曲面要求高或者缺失原始几何数据的制品,此方法更能发挥其优势。 相似文献
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本文总结了应用Smart Plant3D进行窑尾预热器车间设计的基本过程及相关注意点,简单分析了应用Smart Plant3D设计所带来设计周期、结构查返方式、各专业协作模式变化及Smart Plant3D在水泥行业推广应用所面临的几点问题。 相似文献
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This feature article summarizes recent advances in an emerging three-dimensional (3D) imaging technique, transmission electron microtomography (TEMT), and its applications to polymer-related materials, such as nanocomposites and block copolymer morphologies. With the recent developments made in TEMT, it is now possible to obtain truly quantitative 3D data with sub-nanometer resolution. A great deal of new structural information, which has never been obtained by conventional microscopy or various scattering methods, can be directly evaluated from the 3D volume data. It has also been demonstrated that, with the combination of TEMT and scattering methods, it becomes possible to study structures that have not yet been characterized. The structural information obtained from such 3D imaging provides a good opportunity not only to gain essential insight into the physics of self-assembling processes and the statistical mechanics of long chain molecules, but also to establish the “structure-property” relationship in polymeric materials. 相似文献
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