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2017 IEEE International Conference on Signal and Image Processing Applications (ICSIPA)最新文献

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Image invariant description based on local Fourier-Mellin transform 基于局部傅里叶-梅林变换的图像不变性描述
Yassine Lehiani, Madjid Maidi, M. Preda, F. Ghorbel
In this paper, we present a novel approach for real-time object identification on a mobile platform. First, our system detects keypoints within a scaled pyramid-based FAST detector and then descriptors of the object of interest are computed using an Analytical Fourier-Mellin transform. The Fourier-Mellin is used in similarity studies due to its invariance property and discrimination power. In this approach, we exploited information from the phase of Fourier Transform instead of magnitude applied on patches. The phase carries more information and handle, particularly, rotation and light changes. Finally, experiments are conducted to evaluate the system performances in terms of accuracy, robustness and computational efficiency as well.
在本文中,我们提出了一种在移动平台上实时目标识别的新方法。首先,我们的系统在基于缩放金字塔的FAST检测器中检测关键点,然后使用解析傅里叶-梅林变换计算感兴趣对象的描述符。傅里叶-梅林算子由于其不变性和判别能力而被用于相似性研究。在这种方法中,我们利用傅里叶变换的相位信息,而不是应用于patch的幅度。相位携带更多的信息和处理,特别是旋转和光的变化。最后,通过实验对系统的精度、鲁棒性和计算效率进行了评价。
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引用次数: 1
An innovative and cost effective lower extremity blood circulation enhancer 一种创新和成本有效的下肢血液循环增强剂
Arushi Mishra, A. Krishna, D. Madathil
An innovative and cost effective lower extremity blood circulation enhancer works on the basic principle of whole body vibration. A prototype is designed with the circuitry consisting of five motors connected in parallel. The prototype is designed in the form of a strapped stocking which is to be worn on the legs and the foot. The motors have been positioned in the prototype in such a way that the major muscles of the lower extremity will directly receive the vibration. The prototype is designed using cotton cloth due to the advantages the material offers. After successful testing of the prototype on ten subjects, signals were acquired from the posterior tibial artery of each of them. The output was obtained in the form of graphs using MATLAB. The prototype was designed successfully at a low price using readily available materials. The outcome showed that there was an increase in circulation of blood in the lower extremities. Further, we also observed that human muscles behave like a spring complex. They readily absorb vibration. This can also be seen from the results of the signal processing.
一种创新和成本效益的下肢血液循环增强器的工作原理是全身振动。设计了一个由五个并联电动机组成的电路原型。原型被设计成绑带袜的形式,可以穿在腿和脚上。在原型机中,马达的位置是这样的,即下肢的主要肌肉将直接接收振动。由于面料的优势,原型设计使用棉布。在10名受试者身上成功测试后,从每位受试者的胫骨后动脉获取信号。利用MATLAB以图形的形式得到输出。原型机是用现成的材料以低廉的价格设计成功的。结果显示,下肢的血液循环增加。此外,我们还观察到人体肌肉的行为就像一个弹簧复合体。它们很容易吸收振动。这也可以从信号处理的结果中看出。
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引用次数: 0
Signal noise filter structure selection for predictive PI controller in a wireless networked control setting 无线网络控制中预测PI控制器的信噪滤波器结构选择
S. Hassan, R. Ibrahim, N. Saad, V. Asirvadam, Kishore Bingi, Tran Duc Chung
The predictive proportional integral (PPI) controller being simple and non conservative like its Smith predictor and internal model control (IMC) counterparts, has the ability to be employed in environments characterised by uncertainties such as stochastic network delays. However, its performance degrades in the presence of measurement noise. This is due to the prediction involve in the controller which acts like the derivative term of PID controller that amplifies high frequency noise. This necessitated the need for additional filtering of the noisy signals. Therefore, this work proposes three several filter configurations for PPI controller in a wireless environment. Simulation results shows that placing the filter within the PPI controller gives smooth control signal that can yield better control performance compared to both feedback and cascade filter configurations.
预测比例积分(PPI)控制器与Smith预测器和内部模型控制(IMC)一样简单且非保守,能够在具有随机网络延迟等不确定性的环境中使用。然而,在测量噪声存在的情况下,其性能会下降。这是由于控制器中涉及的预测类似于PID控制器的导数项,放大了高频噪声。这就需要对噪声信号进行额外的滤波。因此,本研究提出了无线环境下PPI控制器的三种滤波器配置。仿真结果表明,与反馈滤波器和级联滤波器配置相比,将滤波器置于PPI控制器中可以获得平滑的控制信号,从而获得更好的控制性能。
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引用次数: 1
Radial effect in stochastic diagonal approximate greatest descent 随机对角线近似最大下降的径向效应
H. Tan, K. Lim, H. Harno
Stochastic Diagonal Approximate Greatest Descent (SDAGD) is proposed to manage the optimization in two stages, (a) apply a radial boundary to estimate step length when the weights are far from solution, (b) apply Newton method when the weights are within the solution level set. This is inspired by a multi-stage decision control system where different strategies is used at different conditions. In numerical optimization context, larger steps should be taken at the beginning of optimization and gradually reduced when it is near to the minimum point. Nevertheless, the intuition of determining the radial boundary when the optimized parameters are far from the solution is yet to be investigated for high dimensional data. Radial step length in SDAGD manipulates the relative step length for iteration construction. SDAGD is implemented in a two layer Multilayer Perceptron to evaluate the effects of R on artificial neural networks. It is concluded that the greater the value of R, the higher the learning rate of SDAGD algorithm when the value of R is constrained in between 100 to 10,000.
提出随机对角近似最大下降法(SDAGD),分两个阶段进行优化,即当权值离解较远时,采用径向边界估计步长;当权值在解水平集中时,采用牛顿法。这是受到多阶段决策控制系统的启发,其中在不同的条件下使用不同的策略。在数值优化环境中,在优化开始时应采取较大的步长,在接近最小值点时逐渐减少步长。然而,对于高维数据,当优化参数离解很远时,确定径向边界的直觉性还有待研究。SDAGD中的径向步长操纵迭代构造的相对步长。SDAGD在一个两层多层感知器中实现,以评估R对人工神经网络的影响。结果表明,当R的值被约束在100 ~ 10000之间时,R的值越大,SDAGD算法的学习率越高。
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引用次数: 0
Analysis of Q-learning on ANNs for robot control using live video feed 基于实时视频馈送的机器人控制人工神经网络q学习分析
Nihal Murali, Kunal Gupta, S. Bhanot
Training of artificial neural networks (ANNs) using reinforcement learning (RL) techniques is being widely discussed in the robot learning literature. The high model complexity of ANNs along with the model-free nature of RL algorithms provides a desirable combination for many robotics applications. There is a huge need for algorithms that generalize using raw sensory inputs, such as vision, without any hand-engineered features or domain heuristics. In this paper, the standard control problem of line following robot was used as a test-bed, and an ANN controller for the robot was trained on images from a live video feed using Q-learning. A virtual agent was first trained in simulation environment and then deployed onto a robot's hardware. The robot successfully learns to traverse a wide range of curves and displays excellent generalization ability. Qualitative analysis of the evolution of policies, performance and weights of the network provide insights into the nature and convergence of the learning algorithm.
使用强化学习技术训练人工神经网络在机器人学习文献中得到了广泛的讨论。人工神经网络的高模型复杂性以及强化学习算法的无模型特性为许多机器人应用提供了理想的组合。对使用原始感官输入(如视觉)进行泛化的算法有巨大的需求,而不需要任何手工设计的特征或领域启发式。本文以直线跟随机器人的标准控制问题为实验平台,采用Q-learning方法对机器人的人工神经网络控制器进行训练。首先在模拟环境中对虚拟代理进行训练,然后将其部署到机器人的硬件上。该机器人成功地学习了大范围的曲线,并表现出了出色的泛化能力。对网络的策略、性能和权重的演变进行定性分析,可以深入了解学习算法的性质和收敛性。
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引用次数: 1
A vision-based method for the detection of missing rail fasteners 一种基于视觉的钢轨扣件缺失检测方法
Thanawit Prasongpongchai, T. Chalidabhongse, Sangsan Leelhapantu
Visual inspection of rail fasteners is crucial to rail safety. However, the traditional method in which railway staffs manually inspect the conditions of fasteners is time-consuming and prone to human error. In this paper, we present a method to automatically detect missing rail fasteners from top-view images. Using a top-down approach, coarse bounding boxes of potential fastener areas are first located from the track and the tie regions with an edge density map and the RANSAC algorithm. Preprocessed with the guided filter, the region within the bounding boxes are then scanned to detect rail fasteners using PHOG features and e-SVR with RBF kernel. The boxes, in which no fasteners are found, are reported as missing fasteners. The proposed method was tested and has shown a degree of robustness in scenes from complex real-world environments with the 100% probability of detection and 3.47% probability of false alarm for missing fastener detection. The results also indicate that the use of guided filter, RBF kernel and the image pyramid technique for feature extraction significantly improves the performance of the classifier.
钢轨扣件的目视检查对钢轨安全至关重要。然而,传统的铁路工作人员手工检查紧固件状况的方法既费时又容易出现人为错误。本文提出了一种从俯视图图像中自动检测缺轨紧固件的方法。采用自顶向下的方法,首先利用边缘密度图和RANSAC算法从轨道和捆绑区域定位潜在紧固件区域的粗边界框。然后利用PHOG特征和带RBF核的e-SVR对边界框内的区域进行扫描,检测轨道紧固件。没有发现任何紧固件的箱子被报告为丢失的紧固件。对该方法进行了测试,并在复杂的现实环境中显示出一定程度的鲁棒性,对缺失紧固件的检测具有100%的检测概率和3.47%的误报概率。结果还表明,使用引导滤波器、RBF核和图像金字塔技术进行特征提取可以显著提高分类器的性能。
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引用次数: 12
Comparative analysis of eyes detection on face thermal images 人脸热图像中眼睛检测的对比分析
M. N. Hussien, M. H. Lye, M. F. A. Fauzi, Tan Ching Seong, Sarina Mansor
This paper presents the evaluation of visual features for the proposed two eye detection method applied to thermal images. The use of two eye region is due to its distinctive pattern and to overcome the issue of blurred and noisy characteristic in the thermal image. Comparative performance analysis on three different features which includes Haar, Histogram of Oriented Gradients (HoG) and Local Binary Patterns (LBP) is conducted. The performance of the eyes detection method is measured based on the correct detection of both eyes inside the face image. The experiments were done on the Natural Visible and Infrared Facial Expression Database (NVIE). The method proposed in this paper shows good eye detection accuracy. The best detection accuracy is obtained using the HoG feature.
本文提出了应用于热图像的双眼检测方法的视觉特征评价方法。双眼区域的使用是由于其独特的模式,并克服了热图像模糊和噪声的问题。对Haar、直方图定向梯度(HoG)和局部二值模式(LBP)三种特征进行了性能对比分析。眼睛检测方法的性能是基于对面部图像内两只眼睛的正确检测来衡量的。实验在自然可见和红外面部表情数据库(NVIE)上进行。该方法具有良好的眼检测精度。利用HoG特征可以获得最佳的检测精度。
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引用次数: 6
Performance evaluation of a new local edge profile preservation based denoising algorithm 一种基于局部边缘轮廓保持的去噪算法的性能评价
P. S. Patil, B. Neole, K. Bhurchandi
Denoising digital images while preserving sharp details and fine edges is an active area of research. This paper presents novel local edge profile detection and preservation based denoising algorithm for digital images in presence of zero mean Gaussian noise. Detecting and preserving sharp changes in image pixel intensities preserves the visual quality of the denoised image. Twenty four different types and orientations of edges are detected in 3×3 overlapping tiles of a picture. Based on the edge type and orientation, each tile is subjected to integration along the direction of the detected edge. This preserves the edges. Simple averaging is done if a tile does not have any edge. Continuity of edges is maintained by taking the overlapping tiles of the same edge and integrating both the neighbouring tiles in the direction of the edge. The integration across the edges are avoided to preserve the sharpness of the edges. The proposed algorithm is benchmarked with other denoising algorithms in terms of a novel edge representation parameter i.e. number of edge tiles in the input image. The proposed algorithm clearly outperforms the other contemporary algorithms. Most of the other algorithms either over construct or under construct the edges during denoising.
在保留清晰细节和精细边缘的同时去噪数字图像是一个活跃的研究领域。针对存在零均值高斯噪声的数字图像,提出了一种基于局部边缘轮廓检测和保持的去噪算法。检测和保持图像像素强度的急剧变化可以保持去噪图像的视觉质量。在3×3重叠的图片中检测到24种不同类型和方向的边缘。根据边缘类型和方向,沿检测到的边缘方向对每个贴图进行积分。这保留了边缘。如果瓷砖没有任何边缘,则进行简单的平均。边缘的连续性是通过取同一边缘的重叠瓦片,并在边缘方向上对相邻瓦片进行积分来保持的。避免了边缘间的积分,保持了边缘的锐度。提出的算法与其他去噪算法在一个新的边缘表示参数方面进行基准测试,即输入图像中的边缘瓦片数量。该算法明显优于其他当代算法。其他算法在去噪过程中大都对边缘进行过构造或过构造。
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引用次数: 0
Trade-off between mean brightness and contrast in histogram equalization technique for image enhancement 图像增强的直方图均衡化技术中平均亮度与对比度的权衡
Shubhi Kansal, Shikha Purwar, R. Tripathi
Histogram equalization is the simplest method of image enhancement. Mean brightness and contrast are important parameters of an image. Artifacts are generated if the original mean brightness of an image is not preserved. A high contrast provides good visual quality. Contrast can be increased by increasing entropy of the image. Entropy can be maximized by making the image histogram as flat as possible. In this paper, the trade-off between mean brightness and maximum entropy performed to achieve high contrast image with conserved mean brightness.
直方图均衡化是最简单的图像增强方法。平均亮度和对比度是图像的重要参数。如果不保留图像的原始平均亮度,则会产生伪影。高对比度提供了良好的视觉质量。对比度可以通过增加图像的熵来提高。熵可以通过使图像直方图尽可能平坦来最大化。在本文中,在平均亮度和最大熵之间进行权衡,以获得具有守恒平均亮度的高对比度图像。
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引用次数: 11
Classification of SD-OCT images using a Deep learning approach 使用深度学习方法的SD-OCT图像分类
M. Awais, H. Müller, T. Tang, F. Mériaudeau
Diabetic Macular Edema (DME) is one of the many eye diseases that is commonly found in diabetic patients. If it is left untreated it may cause vision loss. This paper focuses on classification of abnormal and normal OCT (Optical Coherence Tomography) image volumes using a pre-trained CNN (Convolutional Neural Network). Using VGG16 (Visual Geometry Group), features are extracted at different layers of the network, e.g. before fully connected layer and after each fully connected layer. On the basis of these features classification was performed using different classifiers and results are higher than recently published work on the same dataset with an accuracy of 87.5%, with sensitivity and specificity being 93.5% and 81% respectively.
糖尿病性黄斑水肿(DME)是糖尿病患者常见的多种眼病之一。如果不及时治疗,可能会导致视力丧失。本文主要研究了使用预训练的卷积神经网络对异常和正常OCT(光学相干断层扫描)图像体进行分类。使用VGG16 (Visual Geometry Group),在网络的不同层提取特征,例如在完全连接层之前和在每个完全连接层之后。在这些特征的基础上,使用不同的分类器进行分类,结果高于同一数据集上最近发表的工作,准确率为87.5%,灵敏度和特异性分别为93.5%和81%。
{"title":"Classification of SD-OCT images using a Deep learning approach","authors":"M. Awais, H. Müller, T. Tang, F. Mériaudeau","doi":"10.1109/ICSIPA.2017.8120661","DOIUrl":"https://doi.org/10.1109/ICSIPA.2017.8120661","url":null,"abstract":"Diabetic Macular Edema (DME) is one of the many eye diseases that is commonly found in diabetic patients. If it is left untreated it may cause vision loss. This paper focuses on classification of abnormal and normal OCT (Optical Coherence Tomography) image volumes using a pre-trained CNN (Convolutional Neural Network). Using VGG16 (Visual Geometry Group), features are extracted at different layers of the network, e.g. before fully connected layer and after each fully connected layer. On the basis of these features classification was performed using different classifiers and results are higher than recently published work on the same dataset with an accuracy of 87.5%, with sensitivity and specificity being 93.5% and 81% respectively.","PeriodicalId":268112,"journal":{"name":"2017 IEEE International Conference on Signal and Image Processing Applications (ICSIPA)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122361016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 59
期刊
2017 IEEE International Conference on Signal and Image Processing Applications (ICSIPA)
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