共查询到20条相似文献，搜索用时 15 毫秒
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陈慧 《泉州师范学院学报》2013,(6):53-56
针对图像检索中单一特征检索的不足,提出一种结合分块颜色特征和形状特征的图像检索方法,用空间局部信息增强全局颜色特征,采用分块颜色直方图提取图像的颜色特征,利用Hu不变矩提取图像的形状特征,以分块颜色和形状作为综合特征,采用相应的相似性度量方法进行图像匹配．实验结果证明了该方法的可行性,适用于基于区域或对象的图像检索． 相似文献
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提出一种基于薄板样条的遥感影像非刚性配准方法。首先,根据SIFT算法分别在参考影像与待配准影像中提取特征点;然后,对特征点进行匹配,并利用RANSAC一致性分级检验方法,由粗至精分级排除错误匹配点;最后,利用同名匹配点构建薄板样条配准模型,并完成图像配准结果。实验结果表明,文中方法能有效解决遥感影像在时相变化、几何变形等条件下的配准,具有较高的实用性。 相似文献
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为了提高园林三维景观绿化廊道空间规划能力,需要进行空间可视化分割,提出基于锐化模板匹配的园林三维景观绿化廊道空间可视化分割方法,构建园林三维景观绿化廊道视觉图像的稀疏表示模型,采用分块模板匹配方法进行园林三维景观绿化廊道视觉图像的边缘轮廓特征分解,提取园林三维景观绿化廊道视觉分布特征量,结合锐化模板特征匹配的方法进行园林三维景观绿化廊道空间区域重构,建立园林三维景观绿化廊道空间三维视景仿真模型,采用可视化的视觉重构和特征提取方法,进行园林三维景观绿化廊道空间可视化分割。仿真结果表明,采用该方法进行园林三维景观绿化廊道空间可视化分割的自适应性较好,特征分辨能力较强,提高园林三维景观绿化廊道的设计效果。 相似文献
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通过对反义疑问句的实体构式及图式构式分析,进一步探讨了两种构式的互补关系及整体统一性。句法、语义和语用特征是各构式的基本组成要素,对三要素的分析清晰展示了构式的层级特征。低层级构式的共性整合出高层级的构式,各构式具有不同的能产性,层级越高,语义句法结构越抽象,语用功能越复杂。各层级的构式互为条件、在互动中构成统一的整体。揭示了反义疑问句形式与认知模型的对应理据。 相似文献
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Rats found food in a rectangular enclosure in three experiments testing how learning about a distinctive feature near a goal
interacts with learning based on the geometry of an enclosure. Rats trained to follow a feature in square and triangular enclosures
and to use geometry in the rectangle followed the feature when it was in the rectangle (Experiment 1). Rats trained with the
feature in a geometrically consistent corner of the rectangle learned about both geometry and the feature (Experiment 2).
Training with the feature in the square did not block learning of geometry when both predicted the location of food in the
rectangle (Experiment 3). The “geometric module” (Cheng, 1986) may have a special status in spatial learning. 相似文献
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Most electronics products use PCB to carry electronic circuits. This paper classifies information contained in PCB-based electronic circuits into several models: geometry model, physics model, performance model and function model. Based on this classification, a multi-information model of product is established. A composite model of product is also created based on object-orientation and characteristics of the product. The model includes a 3D geometry model, a physics model with integrated information that can be divided into microscopic and macroscopic information, a generalized performance model and a function model that are from top to bottom. Finally, a multi-unit analysis is briefly discussed. 相似文献
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计算机辅助设计技术的不断成熟发展是设计重用技术能够得到有效利用的前提条件。针对产品建模过程中典型零件的特征发布和特征驱动技术的日益成熟,将零件模板几何层的设计分为接口设计及几何实体设计方法,并应用于机车车辆的快速设计。 相似文献
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In this work, image feature vectors are formed for blocks containing sufficient information, which are selected using a singular-value criterion. When the ratio between the first two SVs are below a given threshold, the block is considered informative. A total of 12 features including statistics of brightness, color components and texture measures are used to form intermediate vectors. Principal component analysis is then performed to reduce the dimension to 6 to give the final feature vectors. Relevance of the constructed feature vectors is demonstrated by experiments in which k-means clustering is used to group the vectors hence the blocks. Blocks falling into the same group show similar visual appearances. 相似文献
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詹泽海 《深圳职业技术学院学报》2010,9(1):7-11
文章介绍一种模拟量信号的采集方法,包括不同类型模拟量传感器在信号采集系统中的具体接线与注意事项,如何利用STEP7V5．4编程平台针对不同类型模拟量传感器进行硬件组态,以及借助STEP7V5．4编程平台自带的变量表功能对系统进行进一步的在线调试与数据监控． 相似文献
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A color-intensity feature extraction method is proposed aimed at supplementing conventional image hashing algorithms that only consider intensity of the image. An image is mapped to a set of blocks represented by their dominant colors and average intensities. The dominant color is defined by hue and saturation with the hue value adjusted to make the principal colors more uniformly distributed. The average intensity is extracted from the Y component in the YCbCr space. By quantizing the color and intensity components, a feature vector is formed in a cylindrical coordinate system for each image block, which may be used to generate an intermediate hash. Euclidean distance is modified and a similarity metric introduced to measure the degree of similarity between images in terms of the color-intensity features. This is used to validate effectiveness of the proposed feature vector. Experiments show that the color-intensity feature is robust to normal image processing while sensitive to malicious alteration, in particular, color modification. 相似文献
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With the development of modern industry,sheet-metal parts in mass production have been widely applied in mechanical,communication,electronics,and light industries in recent decades; but the advances in sheet-metal part design and manufacturing remain too slow compared with the increasing importance of sheet-metal parts in modern industry. This paper proposes a method for automatically extracting features from an arbitrary solid model of sheet-metal parts; whose characteristics are used for classification and graph-based representation of the sheet-metal features to extract the features embodied in a sheet-metal part. The extracting feature process can be divided for valid checking of the model geometry,feature matching,and feature relationship. Since the extracted features include abundant geometry and engineering information,they will be effective for downstream application such as feature rebuilding and stamping process planning. 相似文献
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为了改善传统基于聚类的图像分割算法对噪声敏感以及仅使用单一特征无法精确描述目标特性等问题,提出了一种基于区域的多特征图像分割算法。首先,使用 Meanshift 算法对原图像进行预分割,获得一组区域块;其次,提取每个区域块的颜色特征和纹理特征,使用 FCM 算法分别对每个特征进行聚类,针对每个特征获得一个类标签邻接矩阵;再次,将多个邻接矩阵叠加,形成多特征邻接矩阵;最后,使用 NCUT 算法对叠加邻矩阵进行聚类,获得最终分割图像。实验结果表明,基于区域多特征的分割算法优于对比算法,融合多特征对图像分割可以更准确地识别不同的目标结构,具有更好的分割效果。 相似文献
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针对PCB板缺陷检测中用传统SURF算法进行图像匹配精度不高的问题,提出一种生产工序中运动平台机械误差先验信息与SURF特征提取相结合的MSURF配准算法。通过提取计算SURF特征点,求出对应特征点对的距离;在PCB运动平台机械误差分析的基础上,依据先验阈值边界条件筛除异常匹配特征点对;求出两幅图像满足最小二乘拟合准则的映射关系,并将其用于图像配准。在机械运动误差0.05~0.10 mm范围内对42 mm×42 mm的PCB图像配准实验,结果表明:提出的图像配准方法速度快、精度高,适用于产线PCB缺陷检测。 相似文献
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特征技术在设计和制造中的成功应用取决于其形式化理论的建立．本文从形式化定义和可制造性分析两个方面研究了面向制造设计中制造特征的形式化描述方法，提出了基于设计几何材料去除操作选择和规划的相关制造特征定义，给出了相应的可制造性分析算法框架．所提出的方法为基于特征的ＣＡＤ／ＣＡＭ集成，尤其是为设计自动化的实现提供了一种新的思路． 相似文献
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梅蓉 《河南职业技术师范学院学报》2014,(4):70-74
为了提高人脸识别率,研究了一种基于边缘二值图像特征向量提取的方法。通过局部二值模式提取特征向量,考虑到边缘二值图像特征向量与局部二值模式提取的特征向量的区别,提出了将这两类特征向量通过PCA方法融合实现人脸识别的方法。实验结果表明基于两类特征向量融合的人脸识别方法可以有效地提高识别率。 相似文献
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To improve the accuracy of sand-dust storm forecast system, a sand-dust storm ensemble forecast model based on rough set (RS) is proposed. The feature data are extracted from the historical data sets using the self-organization map (SOM) clustering network and single fields forecast to form the feature values with low dimensions. Then, the unwanted attributes are reduced according to RS to discretize the continuous feature values. Lastly, the minimum decision rules are constructed according to the remainder attributes, namely sand-dust storm ensemble forecast model based on RS is constructed. Results comparison between the proposed model and the back propagation neural network model show that the sand-storm forecast model based on RS has better stability, faster running speed, and its forecasting accuracy ratio is increased from 17.1% to 86.21%. 相似文献
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纪永强 《湖州师范学院学报》2014,(8):1-6
利用代数方法给出了三维内积空间中正交变换的特征向量的几何意义,研究了三维内积空间R3中的旋转变换(正交变换)的特征向量只有一个实的特征向量,以及研究了空间中关于经过原点的平面的对称变换(正交变换)的特征向量就是该平面的法矢量和该平面上自原点出发的任意矢量,并且它们是互相垂直的. 相似文献