共查询到19条相似文献,搜索用时 62 毫秒
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本文提出了一种新的基于视觉技术的手指屏幕交互方法,利用手指在屏幕上的移动和点击等动作完成与计算机的交互.该方法使用两个摄像头从不同视角实时拍摄计算机屏幕,结合人手肤色和轮廓信息对手指进行实时跟踪,并根据两幅图像中的指尖位置和摄像头参数来判断指尖是否接触屏幕.实验结果表明,该方法可以完成鲁棒的手指跟踪和准确的点击检测,对光照条件没有严格的限制,实现了自然友好的人机交互操作,可以运用于智能交互、数字娱乐、穿戴计算等多种应用场合. 相似文献
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本文提出了一种全新的手指书写虚拟文字识别系统,该系统利用摄像头捕捉人手指的运动轨迹,通过手指跟踪及检测算法,恢复出手指虚拟"书写"文字的二维图像数据(称之为虚拟文字),再进行识别输出.文中对单层函数连接神经网络进行改进并用来进行高准确度的运动手指尖的预测及跟踪,给出了一种基于数学形态学及模板匹配的简单有效的手指检测方法,提出了基于运动手指跟踪的"虚拟文字"恢复方法.实验结果表明:系统方案可行,手指跟踪及检测准确率高,对手指"书写"的数字、英文等虚拟文字识别率能达到95%以上. 相似文献
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针对特殊材料能伪造手指静脉从而欺骗识别系统,以及利用卷积神经网络进行手指静脉识别计算量大的问题,设计了具有活体检测功能和轻量化卷积神经网络结构的手指静脉识别系统。采用光容积法检测手指脉搏波的变化,从而判断被采集对象是否为活体;利用剪枝及通道恢复方法改进了ResNet-18卷积神经网络,并结合L1正则化增加卷积神经网络的特征选择能力,在提升算法准确率的基础上,能有效地降低计算资源的消耗。实验表明,使用改进的剪枝及通道恢复优化结构,参数量降低了75.6%,计算量降低了25.6%,在山东大学和香港理工大学手指静脉数据库上得到的等误率分别为0.025%、0.085%,远低于ResNet-18得到的等误率(0.117%、0.213%)。 相似文献
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指尖提取已成为基于视觉的裸手人机交互的关键技术,针对目前很多识别手势和指尖检测方法存在的对设备要求高、系统效率低、局限于单指检测、应用局限性高和对于弯曲手指存在误检等诸多问题,提出了一种改进型高精度曲率多指尖检测法。首先,通过对提取到的手势边缘序列点求曲率和像素值判断法排除手指凹槽。同时还提出了掌心测距法结合手掌外接圆法等有效地去除了握拳时和手指半弯时解决类指尖误判问题的方案。最后,整合优化算法流程,实验验证表明该改进的检测方法能较好地提高程序运行效率,检测精度与运行速度得到了明显的改善。 相似文献
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三维机动辐射源的单站无源跟踪方法 总被引:10,自引:0,他引:10
针对单站无源定位中对于机动辐射源利用角度及其变化率能否定位的问题,引入雷达对机动目标跟踪的多级噪声自适应(ANL)法和交互多模(IMM)方法,以及机动目标运动模型如Singer模型、匀加速模型等,研究并提出了两种对机动辐射源利用角度及其变化率进行单站无源跟踪方法。通过计算机数字仿真表明,在满足定位可观测条件的前提下,对机动辐射源仅仅利用角度及其变化率是可以定位的,其中IMM方法具有比较优秀的性能。 相似文献
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我们将三维成像定义为含有四个步骤的工乙:──数据获取,──储存(需要时),─—变换(需要时),─—数据显示。必须假定:对于充分(或近充分的)三维成像来说,通常需要精密设备将原获取的数据进行视频编码,并以解码形式将它显示[3]。例如:用于产生整帧照片或视差全是照片、全息术中干涉条纹、立体系统中可显示扫描的立体像素数目的透镜列阵。目前已对三维系统作了许多改进。可归纳为以下几种:─—立体摄影术,─—全息术,─—体全息术,─—以上几种的综合。图1示出现有三维成像的几种主要方式。激光三维成像作为三维成像技术的… 相似文献
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实际场景中往往存在运动阴影和障碍物遮挡等情况,严重影响了目标检测和跟踪的效果.为解决此问题,提出了一种抗阴影和遮挡的的运动目标检测与跟踪方法.该方法首先引入分类浮动更新策略,有效减轻了运算负担;其次,利用基于纹理梯度差和颜色特征不变量的阴影检测模块,为后续更加准确的分割前景创造了条件;然后采用基于MeanShift框架和最大化后验概率匹配相结合的方式跟踪目标,并引入了障碍遮挡跟踪机制,以降低运动目标在遮挡场景跟丢的可能性.实验表明,该方法可有效检测出运动目标的阴影,实现在遮挡场景对运动目标的稳定跟踪. 相似文献
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Brignone M. Bozza G. Randazzo A. Piana M. Pastorino M. 《Antennas and Propagation, IEEE Transactions on》2008,56(10):3224-3232
A hybrid approach is proposed to inspect three-dimensional homogeneous dielectric scatterers by using microwaves. Namely, the considered method consists in two steps: first, the supports of the scatterers are retrieved by the linear sampling method; then the permittivities of the targets are estimated by an ant colony optimization algorithm. The described strategy combines the efficiency of the linear sampling method with the global optimization capabilities of the stochastic procedure. Numerical results assess the capabilities of the approach also in the presence of noise. 相似文献
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《Latin America Transactions, IEEE (Revista IEEE America Latina)》2007,5(5):271-279
A new computational parallel model based on 3D ray-tracing for radio propagation prediction is presented. This approach considers that the main tasks in a 3D ray-tracing technique can be evaluated in an independent and/or parallel way. The workload distribution among the participant nodes of the parallel architecture (cluster of PC's) is performed through a random assignment of the initial rays and the field points for them. Simulations are realized in order to validate and evaluate the performance of the proposed model. The presented results show that the scalability of the model is obtained naturally due to independence of the involved processes. The efficiency of the model presents behavior above the ideal for cases with ostensible processing of rays. These characteristics favor to the increase of the prediction precision through the increase of the density of launched rays and the possibility of incorporation of new propagation mechanisms. 相似文献
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文章提出一个面向移动嵌入式终端的柔性人机界面模型--FHCIM.该模型首先对柔性人机界面的控件、参数以及动作进行了形式化抽象描述,然后在给定的柔性人机界面标记集合的基础上,使用该自定义的标记构造了人机界面的具体描述.随后,将人机界面的具体描述送入柔性人机界面显示模块,根据标记描述的控件属性,生成相应的对象并显示,并在相应动作的触发下,获得所需信息.最后给出了一个移动嵌入式终端的柔性人机界面实现的具体实例. 相似文献
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A Universal and Facile Approach for the Formation of a Protein Hydrogel for 3D Cell Encapsulation 下载免费PDF全文
Yin Chen Xin Dai Lu Huang Yang Sun Ho N. Chan Bo Shen Xiaoqian Zeng Zhenguo Wu I‐Ming Hsing Zhihong Guo Hongkai Wu 《Advanced functional materials》2015,25(39):6189-6198
A universal and facile approach to modifying proteins so that they can rapidly form hydrogel upon mixing with crosslinkers is presented. The concept of it is to introduce maleimide, which is highly reactive with dithiol‐containing crosslinkers via thiol‐ene click chemistry, onto proteins. Bovine serum albumin (BSA) is used as a model protein due to its good stability and low cost. The results here show that a protein hydrogel can be readily formed by blending modified BSA and resilin‐related peptide crosslinker solutions at a proper ratio. The hydrogel exhibits good elasticity and tunable mechanical as well as biochemical properties. Moreover, it allows convenient 3D cell encapsulation and shows good biocompatibility. Muscle cells embedded in the hydrogel are promoted to spread by incorporating arginyl‐glycyl‐aspartic acid (RGD)‐containing peptide into the system, thus warranting a bright future of it in regenerative medicine. 相似文献
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A Bottom‐Up Approach to Build 3D Architectures from Nanosheets for Superior Lithium Storage 下载免费PDF全文
Yongji Gong Shubin Yang Liang Zhan Lulu Ma Robert Vajtai Pulickel M. Ajayan 《Advanced functional materials》2014,24(1):125-130
Two‐dimensional (2D) atomic layers such as graphene, and metal chalcogenides have recently attracted tremendous attention due to their unique properties and potential applications. Unfortunately, in most cases, the free‐standing nanosheets easily re‐stack due to their van der Waals forces, and lose the advantages of their separated atomic layer state. Here, a bottom‐up approach is developed to build three‐dimensional (3D) architectures by 2D nanosheets such as MoS2 and graphene oxide nanosheets as building blocks, the thin nature of which can be well retained. After simply chemical reduction, the resulting 3D MoS2‐graphene architectures possess high surface area, porous structure, thin walls and high electrical conductivity. Such unique features are favorable for the rapid diffusions of both lithium ions and electrons during lithium storage. As a consequence, MoS2‐graphene electrodes exhibit high reversible capacity of ≈1200 mAh g?1, with very good cycling performance. Moreover, such a simple and low‐cost assembly protocol can provide a new pathway for the large‐scale production of various functional 3D architectures for energy storage and conversions. 相似文献