共查询到19条相似文献，搜索用时 203 毫秒
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针对传统的单一人脸识别身份的方法在遇到光线不明、粉尘附着、部分遮挡情况下,识别效果不佳.本文提出了多种生物特征相融合的识别方法.该方法首先提取井下人员的人脸、虹膜、指纹的特征,对特征进行融合并产生新的特征向量,通过监督式学习训练,形成新的图像特征模板库.最后,用获取的人员新特征与模板库的特征进行匹配,从而完成身份识别.在图像处理过程中,使用了霍特林变换,快速滤除大部分无用特征信息,通过决策树支持向量机分类器(decision trees support vector machine,DT-SVM)精准实现身份识别.实验仿真结果表明:这种方法减少了算法的计算复杂度,提高了身份识别的准确性,增强了对工作人员的安全监控. 相似文献
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虹膜的身份识别在国际上已成为一个研究的热点领域。本文主要比较了虹膜特征提取和匹配的几种主要算法,分别说明了Gabor变换、傅里叶变换和小波变换的优点与不足,并指出相对而言,小波变换更适合应用在虹膜图像的识别中。 相似文献
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虹膜识别技术：简捷便利的身份识别方式
“一栋高楼插入云端,这里是火星登陆基地的总部,成百上千的工作人员,身着全套的防辐射服在各自的岗位上忙碌着。一位金发女士来到实验室门口,警惕地看看周围,眼睛对着门上的机器望过去。刷地一声,机器屏幕上闪烁出她的虹膜扫射图像,门向一旁开去……” 相似文献
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针对传统人脸图像纹理特征识别方法中存在的计算量大,样本训练与测试时间较长,识别正确率较低等问题,提出一种新的基于PCA模型的人脸图像纹理特征高精度识别方法。在人脸图像预处理过程中,采用Gabor滤波器确定人脸图像训练样本中的双眼位置,结合卷积运算与人脸几何模型从图像中分割出目标人脸区域,并对分割得到的图像进行规范化处理;采用PCA模型对预处理后的图像进行降维与特征向量提取,并根据选取的主要纹理特征以及欧式距离近似度量结果,实现人脸图像纹理特征高精度识别。实验结果表明,所提方法的识别准确度高于实验对比方法,且样本训练时间与测试时间明显缩短,具有较好的鲁棒性。 相似文献
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《Information processing & management》2020,57(3):102186
The advantages of user click data greatly inspire its wide application in fine-grained image classification tasks. In previous click data based image classification approaches, each image is represented as a click frequency vector on a pre-defined query/word dictionary. However, this approach not only introduces high-dimensional issues, but also ignores the part of speech (POS) of a specific word as well as the word correlations. To address these issues, we devise the factorized deep click features to represent images. We first represent images as the factorized TF-IDF click feature vectors to discover word correlation, wherein several word dictionaries of different POS are constructed. Afterwards, we learn an end-to-end deep neural network on click feature tensors built on these factorized TF-IDF vectors. We evaluate our approach on the public Clickture-Dog dataset. It shows that: 1) the deep click feature learned on click tensor performs much better than traditional click frequency vectors; and 2) compared with many state-of-the-art textual representations, the proposed deep click feature is more discriminative and with higher classification accuracies. 相似文献
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针对部分遮挡的人脸表情识别,提出了一种基于部分遮挡判断的人脸表情识别方法：首先对包含表情信息的静态图像进行Gabor小波变换,提取表情特征矢量,然后用最大相关分类器对特征矢量分类。实验表明,该方法对局部遮挡的人脸表情识别有较强的鲁棒性。 相似文献
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基于内容的图像检索是解决目前图书馆查询大量图片资料的有效方法。本文在研究低层视觉特征提取、高维索引、相似性度量准则与相关反馈技术的基础上,构建了一个高效实用的图书馆图片检索系统,提出了一种颜色特征提取和特征向量的索引方法,对系统的构建方法进行了较详细的讨论。 相似文献
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一种基于活动围道的纹理图像分割方法 总被引：1，自引：0，他引：1
本文将Gabor滤波器和各向异性扩散方程相结合，提出了一种基于活动围道的无监督纹理图像分割算法。采用基于总变分流的扩散函数，各向异性扩散方程可以有效地在保留纹理图像大尺度边界信息的同时对图像纹理区域进行平滑，获得比原始图像更易分割的简化图像。但是平滑过程中纹理信息的丧失，限制了该方法的通用性和有效性。为了在利用各向异性扩散方法的同时有效地提取和利用纹理信息，我们利用Gabor滤波器提取一组表征纹理方向性和尺度性的特征图像，同时将原始图像作为表征纹理灰度信息的一个特征通道考虑。再利用矢量形式的各向异性扩散方程对特征图像进行边界保持的各向异性平滑。我们将基于区域灰度统计参数估计的活动围道分割方法扩展到矢量空间，来对平滑后的纹理特征量进行分割。实验证明利用该纹理分割算法可以获得较好的效果。 相似文献
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《Journal of The Franklin Institute》2022,359(15):8307-8330
In this paper, an image-based visual servoing (IBVS) control strategy with a virtual camera frame is proposed for multirotor vehicles. Compared to previous works, the proposed IBVS controller requires minimal sensors in the position loop: a monocular camera and gyroscope. To achieve this, the visual feature projected onto the virtual image plane is associated with the plane’s normal instead of relying on an additional attitude estimator and prior knowledge of the plane’s inclination. Furthermore, we show that the ratio velocity, when scaled by the image moment, exhibits a similar dynamics to the linear velocity. The finding allows the quantity to be recovered and used for control with a monocular camera without other metric cues. To provide feedback for the controller, an Extended Kalman filter for estimating the ratio velocity, target plane’s inclination, and relative rotation between the current and reference camera frame is developed using only monocular vision and gyroscopic measurements. To validate the proposed controller and estimation strategy, both simulation and real-world flight experiments were carried out. The quadrotor smoothly and robustly tracked both dynamic horizontal and static inclined targets, without prior knowledge of the target’s inclination. Overall, the proposed regime offers a lightweight and robust alternative IBVS solution for rotorcraft. 相似文献
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女性服饰形象之美,因为她婀娜多姿的魅力与内涵;女性服饰形象之丰富,因为她的选择范围远远大于男性;女性服饰形象之变化,因为她有着千姿百态的外貌与形态。从杭州女装服饰形象与消费文化研究入手,管窥中国现代女性服饰形象塑造,文章分析其内涵与意义。 相似文献
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研究一种基于SOPC技术的视频画面分割器的设计。该系统通过在FPGA芯片上配置NiosⅡ软核处理器和相关的接口模块来实现其主要的硬件电路,并结合系统的软件设计来控制多路高速多功能视频解码芯片ADV7181,实现对图像数据的高速采集、有效抽取及压缩、存储、画面数据合成及显示等功能。 相似文献
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We present an image retrieval framework based on automatic query expansion in a concept feature space by generalizing the vector space model of information retrieval. In this framework, images are represented by vectors of weighted concepts similar to the keyword-based representation used in text retrieval. To generate the concept vocabularies, a statistical model is built by utilizing Support Vector Machine (SVM)-based classification techniques. The images are represented as "bag of concepts" that comprise perceptually and/or semantically distinguishable color and texture patches from local image regions in a multi-dimensional feature space. To explore the correlation between the concepts and overcome the assumption of feature independence in this model, we propose query expansion techniques in the image domain from a new perspective based on both local and global analysis. For the local analysis, the correlations between the concepts based on the co-occurrence pattern, and the metrical constraints based on the neighborhood proximity between the concepts in encoded images, are analyzed by considering local feedback information. We also analyze the concept similarities in the collection as a whole in the form of a similarity thesaurus and propose an efficient query expansion based on the global analysis. The experimental results on a photographic collection of natural scenes and a biomedical database of different imaging modalities demonstrate the effectiveness of the proposed framework in terms of precision and recall. 相似文献