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Proceedings 2014 IEEE International Conference on Security, Pattern Analysis, and Cybernetics (SPAC)最新文献

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An efficient and practical calibration method for roadside camera using two vanishing points 一种高效实用的路边摄像头双消失点标定方法
Yuan Zheng, Zhenyu He, Wei-Guo Yang, Xiaofeng Zhang
Calibrating roadside camera is essential and indispensable for intelligent traffic surveillance systems. Due to the characteristics of the traffic scenes, the traditional camera calibration methods based on calibration patterns are no longer suitable, since there are generally no calibration patterns (e.g. checkerboard) in traffic scenes. In this paper, we propose a simple and practical calibration method for roadside camera, where the vanishing point in the traffic road direction and the vertical vanishing point are employed that can be easily obtained from most traffic scenes. By making full use of video information, the multiple observations of two vanishing points are available. In order to obtain more accurate calibration results, we present a dynamic calibration method that employs these observations to correct camera parameters and substitutes least squares optimization for closed-form computation. The experimental results on real traffic images demonstrate the effectiveness and practicability of the proposed calibration method.
在智能交通监控系统中,路边摄像头的标定是必不可少的。由于交通场景的特点,传统的基于定标模式的摄像机定标方法已经不再适用,因为交通场景中一般没有定标模式(如棋盘格)。本文提出了一种简单实用的路边摄像头标定方法,利用交通道路方向上的消失点和垂直方向上的消失点,这些都可以从大多数交通场景中轻松获得。通过充分利用视频信息,实现了对两个消失点的多重观测。为了获得更精确的标定结果,我们提出了一种动态标定方法,该方法利用这些观测值来校正相机参数,并用最小二乘优化代替封闭式计算。在真实交通图像上的实验结果验证了所提出的标定方法的有效性和实用性。
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引用次数: 2
Design of general-purpose acquisition-control module for well-logging signal based on DSP and FPGA 基于DSP和FPGA的通用测井信号采集控制模块设计
Xu Dahua, Wang Jun
The signal-acquisition-control-modules of existing well-logging tools have poor universality, low integration and poor stability. A general-purpose signal-acquisition-control module for versatile well-logging tool is designed which is based on SM320F28335 DSP chip and A3P250 FPGA chip. The composition of the hardware circuit is given. The acquisition on analog signals, pulse signals, as well as waves can be completed by this module, which can control both relay and analog switch. The module can provide versatile bus interfaces. On different well-logging tools, no change is needed for the hardware circuit, what's only needed is to download the corresponding procedure. Tests show that this module works stably and has high performance and low failure rate, which shows that it is suitable for the mal-condition of high temperature and pressure underground.
现有测井仪器的信号采集-控制模块通用性差,集成度低,稳定性差。设计了一种基于SM320F28335 DSP芯片和A3P250 FPGA芯片的通用多功能测井仪信号采集控制模块。给出了硬件电路的组成。该模块可以完成对模拟信号、脉冲信号和波形的采集,同时控制继电器和模拟开关。该模块可以提供多种总线接口。在不同的测井工具上,不需要改变硬件电路,只需要下载相应的程序即可。试验表明,该模块工作稳定,性能高,故障率低,适用于地下高温高压工况。
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引用次数: 0
Query dependent multiview features fusion for effective medical image retrieval 基于查询相关多视图特征融合的医学图像检索
Hualei Shen, Yongwang Zhao, Dian-fu Ma, Yong Guan
Multiple features have been employed for content-based medical image retrieval. To reduce curse of dimensionality, subspace learning techniques have been applied to learn a low-dimensional subspace from multiple features. Most of the existing methods have two drawbacks: first, they ignore the fact that multiple features have complementary properties, and thus have different contributions to construct the final subspace; second, they construct the optimal subspace without considering user's query preference, i.e., for a same query example, different users want different query results. In this paper, we propose a new method termed Query Dependent Multiview Features Fusion (QDMFF) for content-based medical image retrieval. Inspired by ideas of multiview subspace learning and relevance feedback, QDMFF iteratively learns an optimal subspace by fusing multiple features obtained from user feedback examples. The method operates in the following four stages: first, in local patch construction, local patch is constructed for each feedback example in different feature space; second, in patches combination, all patches within different feature spaces are assigned different weights and unified as a whole one; third, in linear approximation, the projection between original high dimensional feature spaces and the final low-dimensional subspace is approximated by a linear projection; finally, in alternating optimization, the alternating optimization trick is utilized to solve the optimal subspace. Experimental results on IRMA medical image data set demonstrate the effectiveness of QDMFF.
基于内容的医学图像检索采用了多种特征。为了减少维数的损失,应用子空间学习技术从多个特征中学习低维子空间。现有的方法大多存在两个缺点:一是忽略了多个特征具有互补性质,因而对构造最终子空间的贡献不同;其次,在不考虑用户查询偏好的情况下构造最优子空间,即对于同一个查询示例,不同的用户需要不同的查询结果。本文提出了一种基于查询相关多视图特征融合(QDMFF)的医学图像检索方法。QDMFF受多视图子空间学习和相关反馈思想的启发,通过融合从用户反馈示例中获得的多个特征,迭代地学习最优子空间。该方法分为四个阶段:首先,在局部补丁构建阶段,对每个反馈样例在不同的特征空间中构建局部补丁;其次,在斑块组合中,对不同特征空间内的斑块赋予不同的权重,统一为一个整体;第三,在线性逼近中,将原始高维特征空间与最终低维子空间之间的投影用线性投影逼近;最后,在交替优化中,利用交替优化技巧求解最优子空间。在IRMA医学图像数据集上的实验结果证明了QDMFF算法的有效性。
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引用次数: 1
Gaussian latent variable models for variable selection 用于变量选择的高斯潜变量模型
Xiubao Jiang, Xinge You, Yi Mou, Shujian Yu, W. Zeng
Variable selection has been extensively studied in linear regression and classification models. Most of these models assume that the input variables are noise free, the response variables are corrupted by Gaussian noise. In this paper, we discuss the variable selection problem assuming that both input variables and response variables are corrupted by Gaussian noise. We analyze the prediction error when augment one related noise variable. We show that the prediction error always decrease when more variable were employed for prediction when the joint distribution of variables are known. Based on this analysis, in sense of mean square error, the optimal variable selection can be obtained. We found that the results is very different from the matching pursuit algorithm(MP), which is widely used in variable selection problems.
变量选择在线性回归和分类模型中得到了广泛的研究。这些模型大多假设输入变量是无噪声的,响应变量被高斯噪声破坏。本文讨论了假设输入变量和响应变量都受到高斯噪声破坏的变量选择问题。我们分析了增加一个相关噪声变量时的预测误差。结果表明,当变量的联合分布已知时,采用更多的变量进行预测,预测误差总是减小的。基于此分析,在均方误差的意义上,可以得到最优的变量选择。我们发现结果与广泛用于变量选择问题的匹配追踪算法(MP)有很大的不同。
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引用次数: 0
Medical social media analytics via ranking and big learning: An image-based disease prediction study 通过排名和大学习进行医学社交媒体分析:基于图像的疾病预测研究
Wei Huang, Peng Zhang, Minmin Shen
Medical social media analytics becomes more and more popular nowadays because of its effectiveness in benefiting diverse health-care applications. In this study, the essential disease prediction task is investigated and realized via medical social media analytics techniques. To be specific, arterial spin labeling (ASL), an emerging functional magnetic resonance imaging modality, is utilized to provide image-based information and novel ranking as well as learning techniques are proposed and incorporated to fulfill the disease prediction task in dementia. To demonstrate its superiority, comprehensive statistical experiments are conducted with comparison to several conventional methods. Promising results are reported from this study.
医学社交媒体分析如今变得越来越流行,因为它在各种医疗保健应用中都很有效。在本研究中,通过医学社交媒体分析技术来研究和实现基本疾病预测任务。其中,动脉自旋标记(ASL)是一种新兴的功能磁共振成像方式,可以提供基于图像的信息,并提出了新的排序和学习技术来完成痴呆症的疾病预测任务。为了证明该方法的优越性,进行了综合统计实验,并与几种传统方法进行了比较。这项研究报告了令人鼓舞的结果。
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引用次数: 1
A shape-based stereo matching algorithm for binocular vision 基于形状的双目视觉立体匹配算法
Xinjian Fan, Xuelin Wang, Yongfei Xiao
Binocular stereo vision is an important branch of the research area in computer vision. Stereo matching is the most important process in binocular vision. In this paper, a new stereo matching scheme using shape-based matching (SBM) is presented to improve the depth reconstruction method of binocular stereo vision systems. The method works in two steps. First, an operator registers the pattern including the key features of an object to be measured. Then during the operation stage, the stereo camera snaps stereo images and finds the patterns in right and left images separately by means of the SBM. The 3D positions of the object are calculated by using the corresponding points of the stereo images and the projection matrices of the stereo camera. Since we apply robust image processing algorithms, such as the SBM, the proposed method becomes more reliable than the conventional stereo vision systems.
双目立体视觉是计算机视觉研究领域的一个重要分支。立体匹配是双目视觉中最重要的过程。为了改进双目立体视觉系统的深度重建方法,提出了一种基于形状匹配(SBM)的立体匹配方法。该方法分为两步。首先,操作员注册包含待测量对象的关键特征的模式。然后在操作阶段,立体相机拍摄立体图像,并通过SBM分别在左右图像中找到图案。利用立体图像的对应点和立体摄像机的投影矩阵计算物体的三维位置。由于采用了稳健的图像处理算法,例如SBM,因此所提出的方法比传统的立体视觉系统更加可靠。
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引用次数: 15
Pose-invariant face recognition via SIFT feature extraction and manifold projection with Hausdorff distance metric 基于SIFT特征提取和Hausdorff距离度量的流形投影的姿态不变人脸识别
Jian Zhang, Jinxiang Zhang, Rui Sun
Face recognition has found its usage in various domains like video surveillance and human computer interaction. Current face recognition technique is enslaved to unknown pose of the given face image. This paper proposes a novel approach to pose-invariant face recognition. In the training phase, the SIFT feature descriptors of the sample images are extracted, then an image manifold is constructed using Laplacian Eigenmaps based on Hausdorff distance metric to model the low-dimensional embeddings of the sample images. In recognition phase, the SIFT feature descriptors of the given face image are similarly extracted, and the image is embedded into the existed manifold based on Hausdorff distance metric, the recognition is finally achieved by a K-nearest-neighbor classifier in the low-dimensional subspace. Experimental results on multiple datasets demonstrate the superiority of the proposed approach to existing methods in recognition accuracy rate.
人脸识别在视频监控、人机交互等领域有着广泛的应用。目前的人脸识别技术受给定人脸图像的未知姿态的限制。提出了一种新的姿态不变人脸识别方法。在训练阶段,提取样本图像的SIFT特征描述子,利用基于Hausdorff距离度量的拉普拉斯特征映射构造图像流形,对样本图像的低维嵌入进行建模。在识别阶段,同样提取给定人脸图像的SIFT特征描述符,并基于Hausdorff距离度量将图像嵌入到已有的流形中,最后在低维子空间中使用k近邻分类器实现识别。在多个数据集上的实验结果表明,该方法在识别准确率上优于现有方法。
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引用次数: 1
Evaluation of satellite information tasks processing capacity 评价卫星信息任务处理能力
Gang Liu, Zhimeng Li, Zhenshi Zhang
To solve tasking capability evaluation of satellite information application chain, the basic process of satellite information application chain is analyzed, and a network model of the process was build. The model consider common tasks and emergency tasks, each task has a priority and deadline. The solving process of model is given.
为解决卫星信息应用链任务能力评估问题,分析了卫星信息应用链的基本流程,建立了该流程的网络模型。该模型考虑了普通任务和紧急任务,每个任务都有优先级和截止日期。给出了模型的求解过程。
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引用次数: 0
Abnormal event detection in crowd scenes using quaternion discrete cosine transformation signature 基于四元数离散余弦变换签名的人群场景异常事件检测
Huiwen Guo, Xinyu Wu, Nannan Li, Huan Wang, Yen-Lun Chen
In this paper, an abnormal event detection system inspired by the saliency attention mechanism of human visual system is presented. Conventionally, training-based methods assume that anomalies are events with rare appearance, which suffer from visual scale, complexity of normal events and insufficiency of training data. Instead, we make the assumption that anomalies are events that attract human attentions. Temporal and spatial anomaly saliency are considered consistently by representing the value of each pixel in each frame as a quaternion composed of intensity, contour, motion-speed and motion-direction feature. For each quaternion frame, Quaternion Discrete Cosine Transformation (QDCT) and signature operation are applied. The spatio-temporal anomaly saliency map is developed by inverse QDCT and Gaussian smoothing. Abnormal events appear at those areas with high saliency values. Experiments on typical datasets show that our method can achieve high accuracy results.
本文提出了一种受人类视觉系统显著性注意机制启发的异常事件检测系统。传统的基于训练的方法认为异常是出现罕见的事件,受视觉尺度、正常事件复杂性和训练数据不足等因素的影响。相反,我们假设异常是引起人类注意的事件。通过将每帧中每个像素的值表示为由强度、轮廓、运动速度和运动方向特征组成的四元数,一致地考虑了时空异常显著性。对于每个四元数帧,采用四元数离散余弦变换(QDCT)和签名运算。利用逆QDCT和高斯平滑技术得到时空异常显著性图。异常事件出现在显著值较高的区域。在典型数据集上的实验表明,该方法可以获得较高的精度结果。
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引用次数: 1
A piecewise-based contrast enhancement framework for low lighting video 基于片段的低光照视频对比度增强框架
Dongsheng Wang, Xin Niu, Y. Dou
In this paper, we propose an efficient automatic contrast enhancement algorithm for low lighting video. The algorithm is based on a piecewise stretch on the brightness component extracted with Retinex theory in HSV space to improve the visuality of the image. By dividing the brightness component into dark and bright part, nonlinear transformations with different distribution assumption were performed respectively. All the model parameters were estimated automatically according to the illumination conditions. We use two methods to estimate the brightness. The one is global illumination estimation and the other is local illumination estimation. In comparison with global estimation, a local illumination estimation method is proposed for the further improvement. Experiments show that the algorithm can achieve satisfactory effect for nighttime image or video enhancement by comparing with some state-of-the-art approaches.
本文提出了一种有效的低照度视频对比度自动增强算法。该算法在HSV空间中对Retinex理论提取的亮度分量进行分段拉伸,以提高图像的可视性。将亮度分量分为暗部和亮部,分别进行不同分布假设下的非线性变换。所有模型参数根据光照条件自动估计。我们使用两种方法来估计亮度。一种是全局照明估计,另一种是局部照明估计。在全局估计的基础上,提出了一种局部照度估计方法。实验结果表明,该算法与现有算法相比,对夜间图像或视频的增强效果令人满意。
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引用次数: 23
期刊
Proceedings 2014 IEEE International Conference on Security, Pattern Analysis, and Cybernetics (SPAC)
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