共查询到20条相似文献,搜索用时 68 毫秒
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针对目前指纹识别系统主要采用手指上细节点的分布来表征和匹配指纹,提出了一种采用指纹脊线特征的匹配算法,以提高细节点数量较少情况下的匹配精度.在特征提取阶段,通过脊线采样,只存储脊线采样点集以降低存储量;在匹配时,对欲匹配的两指纹利用细节特征配准脊线集,在重合区域内对两指纹脊线统一进行编码,通过编码的比较确定相似脊线;以相似脊线的相同位置编码为论域,以相同位置编码的相似程度为隶属度,建立衡量脊线相似程度的模糊集,采用加权平均法对多个相似脊线模糊集进行综合评判得到两指纹脊线总体相似度.最后将脊线匹配相似度与细节点匹配相似度进行加权融合得到两指纹最终的相似度.在FVC2004指纹库上的实验表明该算法能够有效提高指纹匹配的准确性. 相似文献
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本文提出一种新的指纹脊线提取方法。首先利用灰度形态学,结合条件模板进行滤波,然后用Otsu方法分割得到二值图像,再将原图反相,进行上述同样处理,最后融合两次分割的结果,提取指纹脊线。实验结果证明本法具有抗噪性、旋转不变性。 相似文献
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通过分析分割算法,结合区域跟踪算法和腐蚀膨胀算法,对基于方向场置信度的分割算法进行了改进;然后,结合一阶对称复数滤波,验证基于传统Poincarê指数法所提取得到奇异点的准确性;在此基础上提出了一种基于"主中心点"脊线跟踪的指纹分类方法,该方法根据"主中心点"附近的脊线信息以及奇异点的数目和相关位置来确定指纹纹型. 相似文献
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提出了一种利用脊线和脊线结构信息进行指纹匹配的方法,即首先利用脊线的相似度初步确定若干参考点对,然后根据脊线间的结构信息利用矢量三角法对初步确定的参考点对进行筛选,最后用可变限界盒法进行匹配。实验结果表明,该方法能够准确地定位参考点对,快速正确地实现指纹匹配。 相似文献
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Zhao Zhiqiang Xiong Liwen Mei Zhuolin Wu Bin Cui Zongmin Wang Tianjiang Zhao Zhijian 《Multimedia Tools and Applications》2020,79(1-2):785-804
Multimedia Tools and Applications - Recently, the technology of visual object tracking has achieved great success. However, it is still extraordinary challenging for some factors, such as scale... 相似文献
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阐述了基于gini系数的决策树构造算法--CART算法.为了使算法能处理递增的数据,引入递增式学习方法,提出了一种改进算法.递增式学习的主要思想是测试函数提升.首先使用己有的数据用CART算法生成一棵决策树,然后使用递增的数据和递增式学习的方法来修改己有的决策树.最后从理论和实践两方面证明了改进算法的正确性和有效性. 相似文献
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针对金融时间序列的特点,论文分析已有混沌特征量算法的基础上,采用特殊的对数线性趋势消除法(简记为LLD)处理数据、引入Rosenstein提出的小数据量算法等计算最大李雅普诺夫指数以及其它混沌系统的特征量,对我国证券市场的混沌动力学结构作出了稳健的分析。结果表明中国股市具有显著的非线性混沌特征,这一结论将为金融理论的研究提供新的方向。 相似文献
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MALLAT算法快速实现方法及其应用研究 总被引:2,自引:0,他引:2
MALLAT算法是小波理论中的重要组成部分,根据MALLAT算法的原理,提出了该算法的一种快速的、实用的实现方法;并把该方法应用到噪声主动控制中,实验结果表明:该快速实现方法是有效的、实用的。 相似文献
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针对卡尔曼滤波器在基于MEMS传感器构成的捷联惯导系统(SINS)误差补偿中的应用,系统分析了微惯性器件组成的载体在运动中所受到的干扰,通过对这些干扰的分析得出其误差模型,采用噪声协方差分析方法,利用卡尔曼滤波对其误差进行补偿。此外,在卡尔曼结构基础上,引入了姿态阵修正,进一步减小了捷联系统外部误差与姿态角误差对载体位置精度的影响。仿真和载体试验结果表明:系统具有较高的精度和较好的可靠性。 相似文献
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Two fundamental approaches to information averaging are based on linear and logarithmic combination, yielding the arithmetic average (AA) and geometric average (GA) of the fusing data, respectively. In the context of multi-sensor target tracking, the two most common formats of data to be fused are random variables and probability density functions, namely v-fusion and f-fusion, respectively. In this work, we analyze and compare the second-order statistics (including variance and mean square error) of AA and GA in terms of both v-fusion and f-fusion. The case of weighted Gaussian mixtures representing multitarget densities in the presence of false alarms and missed detections (whose weight sums are not necessarily unit) is also considered, the result of which turns out to be significantly different from that of a single target. In addition to exact derivation, exemplifying analyses and illustrations are also provided. 相似文献
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We present the design of the Boost interval arithmetic library, a C++ library designed to handle mathematical intervals efficiently and in a generic way. Interval computations are an essential tool for reliable computing. Increasingly a number of mathematical proofs have relied on global optimization problems solved using branch-and-bound algorithms with interval computations; it is therefore extremely important to have a mathematically correct implementation of interval arithmetic. Various implementations exist with diverse semantics. Our design is unique in that it uses policies to specify three independent variable behaviors: rounding, checking, and comparisons. As a result, with the proper policies, our interval library is able to emulate almost any of the specialized libraries available for interval arithmetic, without any loss of performance nor sacrificing the ease of use. This library is openly available at www.boost.org. 相似文献
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《Journal of Parallel and Distributed Computing》1988,5(3):310-330
We derive a binary version of an algorithm of Gosper to compute the sum, difference, product, quotient, and certain rational functions of two rational operands applicable to integrated approximate and exact rational computation. The arithmetic unit we propose is an eight-register computation cell with bit-serial input and output employing a binary continued fraction representation of the rational operands. The operands and results are processed in a most-significant-bit first on-line fashion with bit level logic. Individual bits of the input/output in our binary continued fraction representation are shown to correspond in a one-to-one manner with primitive shift and shift-and-add/subtract operations on pairs of registers in the computation cell. Extension to a redundant signed-bit format is shown feasible toward the ultimate goal of achieving small on-line delay and near uniform throughput in cascaded pipelined computation with these computation cells. 相似文献