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Optomechatronic Technologies (ISOT), 2010 International Symposium on : 25-27 Oct. 2010 : [Toronto, ON]. International Symposium on Optomechatronic Technologies (2010 : Toronto, Ont.)最新文献

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Quantitative phase retrieval 定量相位恢复
G. Barbastathis
Imaging the internal structure of quasi-transparent three-dimensional (3D) objects is one of the most challenging tasks for optical systems. If the light propagates coherently through the volumetric object, then collection of phase projections from different angles and tomographic reconstruction are required. However, a single shot from a high space-bandwidth-product camera is often sufficient to yield 3D information if the object is sufficiently sparse. For incoherent 3D sources or scatterers, the mutual intensity of the propagated field has sufficient degrees of freedom to reconstruct the source but it is limited by the sensitivity (contrast) of the interferometric measurement. We describe two complementary methods of phase recovery. (1) For the coherent sparse case, which typically leads to rapid phase oscillations at the exit pupil, we have implemented several generations of digital holographic imaging systems which can be deployed underwater to image, e.g. aquatic organisms, seed particles, or bubbles in a flow. (2) For slowly varying optical density profiles, we have been investigating phase recovery via the Transport of Intensity Equation (TIE) and we have developed methods to improve contrast and eliminate the inherent scanning requirement by exploiting the (known) object dispersion. We will present experimental results and discuss these methods comparatively.
准透明三维物体的内部结构成像是光学系统最具挑战性的任务之一。如果光在体积物体中以相干方式传播,则需要从不同角度收集相位投影并进行层析重建。然而,如果物体足够稀疏,高空间带宽产品相机的单次拍摄通常足以产生3D信息。对于非相干的三维源或散射体,传播场的相互强度具有足够的自由度来重建源,但受干涉测量的灵敏度(对比度)的限制。我们描述了两种互补的相位恢复方法。(1)对于相干稀疏情况,通常会导致出口瞳孔处的快速相位振荡,我们已经实现了几代数字全息成像系统,可以部署在水下成像,例如水生生物,种子颗粒或流动中的气泡。(2)对于缓慢变化的光密度剖面,我们一直在通过强度输运方程(TIE)研究相位恢复,并开发了利用(已知的)物体色散来提高对比度和消除固有扫描要求的方法。我们将给出实验结果并对这些方法进行比较讨论。
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引用次数: 0
A separability index based on earth mover's distance for local evaluation of fusion systems 基于推土机距离的融合系统局部评价可分离性指标
Abdellah Lamallem, L. Valet, D. Coquin
This paper deals with the uses of the Earth Mover's Distance for local evaluation of fusion system. Local evaluation is an interesting way to better characterize the system behavior and consequently to have information on which subpart needs to be adjusted. The definition of the subpart mission and its measurement are two key points in this problematic. This paper shows that the use of the Earth Mover's Distance for measuring the mission achievement is a more complete mathematical tool. The efficiency of the approach is illustrated on an information fusion system devoted to 3D image analysis.
本文讨论了用震源距离对核聚变系统进行局部评价的方法。局部评估是一种有趣的方法,可以更好地描述系统行为,从而获得需要调整哪个子部分的信息。子部件任务的定义及其测量是该问题的两个关键点。本文表明,用地动距离来衡量任务成就是一种较为完备的数学工具。通过一个用于三维图像分析的信息融合系统验证了该方法的有效性。
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引用次数: 1
Illumination compensation method for local matching Gabor face classifier 局部匹配Gabor人脸分类器的光照补偿方法
C. Pérez, L. Castillo, Leonardo A. Cament
Illumination compensation has proven to be crucial in face detection and face recognition. Several methods for illumination compensation have been developed and tested on the face recognition task using international available face databases. Among the methods with best results are the Discrete Cosine Transform (DCT), Local Normalization (LN) and Self-Quotient Image (SQI). Most of these methods have been applied with great success in face recognition using a principal component classifier (PCA). In the past few years, Local Matching Gabor (LMG) classifiers have shown great success in face classification relative to other classifiers. In this work we optimize several illumination compensation methods using the LMG face classifier. We use ge netic algorithms as the optimization tool. We test our results on the FERET international face database. Results show that face recognition can be significantly improved by illumination compensation methods. The best results are obtained with the optimized LN method which yields a 31% reduction in the total number of errors in the FERET database.
光照补偿在人脸检测和识别中起着至关重要的作用。利用国际上可用的人脸数据库,已经开发了几种照明补偿方法并对人脸识别任务进行了测试。其中效果最好的方法是离散余弦变换(DCT)、局部归一化(LN)和自商图像(SQI)。这些方法大多在主成分分类器(PCA)的人脸识别中得到了成功的应用。近年来,局部匹配Gabor (Local Matching Gabor, LMG)分类器在人脸分类方面取得了巨大的成功。本文利用LMG人脸分类器对几种光照补偿方法进行了优化。我们使用遗传算法作为优化工具。我们在FERET国际人脸数据库上测试了我们的结果。结果表明,采用光照补偿方法可以显著提高人脸识别效果。优化后的LN方法得到了最好的结果,使FERET数据库的总误差减少了31%。
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引用次数: 9
Fast phase-based stereo matching method for 3D shape measurement 基于相位的三维形状测量快速立体匹配方法
Dong Li, Huijie Zhao, Hongzhi Jiang
Three dimensional (3D) shape-measurement systems combining fringe projection and stereo vision utilize phase for dense stereo matching. However, projection of orthogonal fringe patterns and computation of curved epipolar lines due to lens distortion has made traditional phase-based stereo matching time-consuming. This paper presents a phase-based stereo matching method that takes advantage of epipolar line rectification and transforms bi-stereo geometry into epipolar standard geometry. Using phase-shifting techniques to compute ph ase, stereo matching is simplified by searching for the closest phase along horizontal epipolar lines. Compared with the traditional method, this method shortened the stereo matching time by 20 percent. In 3D reconstruction of a plane with high flatness, the 3D shape measurement accuracy was demonstrated to be 0.0178mm. Thus, this method is suitable for applications that require fast speed and high accuracy.
结合条纹投影和立体视觉的三维形状测量系统利用相位进行密集立体匹配。然而,由于正交条纹图案的投影和透镜畸变引起的极线弯曲的计算,使得传统的基于相位的立体匹配非常耗时。本文提出了一种利用极线校正的相位立体匹配方法,将双立体几何转换为极标准几何。利用移相技术计算ph相位,通过沿水平极线搜索最接近的相位来简化立体匹配。与传统方法相比,该方法的立体匹配时间缩短了20%。在高平整度平面的三维重建中,三维形状测量精度达到0.0178mm。因此,该方法适用于速度快、精度高的应用。
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引用次数: 14
Characterization on all effective parameters of anisotropic optical material using Stokes polarimeter — Theory and experiment 用Stokes偏振计表征各向异性光学材料的所有有效参数-理论与实验
Y. Lo, T. Pham
An analytical technique based on the Mueller matrix method and the Stokes parameters is proposed for extracting all effective parameters on the principal axis angle, phase retardance, diattenuation axis angle, diattenuation, optical rotation angle and circular diattenuation value of anisotropic optical materials. The linear birefringence, circular birefringence, linear diattenuation, circular diattenuation properties are decoupled within the analytical model. The result demonstrates the feasibility of analytical model in characterizing all effective parameters of anisotropic optical material. Also, it confirms that the proposed fiber-based polarimeter provides a simple alternative to existing fiber-based probes for parameter measurement in the near field or the remote environment. A low birefringence fiber-based polarimeter based on effective parameters and genetic algorithm without using a fiber polarization controller is first proposed confirmatively. As authors' knowledge, this methodology is introduced in this paper cou ld be the most comprehensive algorithm in extracting all parameters in anisotropic optical materials.
提出了一种基于Mueller矩阵法和Stokes参数的分析方法,用于提取各向异性光学材料的主轴角、相位延迟、双衰减轴角、双衰减、旋光角和圆双衰减值的所有有效参数。线性双折射、圆形双折射、线性双衰减、圆形双衰减特性在解析模型内解耦。结果表明,解析模型在表征各向异性光学材料的所有有效参数方面是可行的。此外,它证实了所提出的基于光纤的偏振计提供了一种简单的替代现有的基于光纤的探针,用于近场或远程环境的参数测量。首次提出了一种不使用光纤偏振控制器的基于有效参数和遗传算法的低双折射光纤偏振仪。据作者所知,本文介绍的方法可能是提取各向异性光学材料中所有参数的最全面的算法。
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引用次数: 1
Spectral imaging with a modified document scanner 光谱成像与改进的文件扫描仪
Yuuto Okuda, Koji Yamashita, I. Fujieda
Spectral imaging of a color document is realized by a modified flat-bed scanner in which its linear image sensor is replaced by a diffraction grating and a two-dimensional image sensor. This illuminant-independent color recording may be ad vantageous for desk-top applications.
采用一种改进的平板扫描仪,将其线性图像传感器替换为衍射光栅和二维图像传感器,实现了彩色文档的光谱成像。这种与光源无关的彩色记录可能有利于桌面应用。
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引用次数: 0
Design and temperature analysis of ZDSF based on triangular graded-index single-mode optical fiber 基于三角形梯度折射率单模光纤的ZDSF设计及温度分析
A. Rostami, S. Makouei, F. Janabi-Sharifi
In this paper, we design a zero-dispersion shifted fiber based on triangular core graded index single mode optical fiber and consider the transmission parameters fluctuations owing to environmental conditions variations such as temperature. The Transfer Matrix Method (TMM) developed in the cylindrical coordinate [1] is used to obtain the field distribution and guided modes. Meanwhile, design process consists of limited coordinate descent optimization method. In order to estimate the thermal coefficients, the model introduced in [2] is applied. It is found out that the propagation characteristics of the proposed graded index fiber have greater endurance against temperature fluctuations compared to the reported structures based on the multi-clad step index ones.
本文设计了一种基于三角芯梯度折射率单模光纤的零色散位移光纤,并考虑了温度等环境条件对传输参数的影响。采用圆柱坐标系下发展的传递矩阵法(Transfer Matrix Method, TMM)[1]来获得场分布和引导模。同时,设计过程采用有限坐标下降优化方法。为了估算热系数,我们采用了[2]中引入的模型。结果表明,与已有的多包层阶梯折射率光纤相比,所提出的梯度折射率光纤的传输特性对温度波动的耐受性更强。
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引用次数: 1
Recognition and tracking of magnetic nanobots using MRI 磁性纳米机器人的MRI识别与跟踪
T. Wortmann, C. Dahmen, C. Geldmann, S. Fatikow
By switching the gradient fields of a clinical magnetic resonance imaging (MRI) scanner, magnetic objects may be moved inside the cardiovascular system of the human body. The main field of application is seen in targeted drug therapy or embolization. A successful navigation of such devices requires continuous position determination. The occurrence of magnetic susceptibility artifacts can be exploited for this purpose. This article studies the effect of magnetic microscopic objects and nanoparticles on the process of MRI image formation in several imaging sequences. An MRI simulator based on evaluation of the Bloch equation is presented and applied for the simulation of artifact formation. Also, artifact properties are studied by experiments carried out on clinical MRI scanners, using magnetic objects placed into an agarose gel phantom. The transferability of the results from the gel phantom to a real tissue environment is proven. Based on the results, a two-stage procedure for visual servoing is proposed. It is initialized by object detection, carried out in a 3D scan. Object tracking is performed on fast 2D scans by template matching. The slice position is adjusted automatically in a feedback loop in order to follow object movements perpendicular to the image plane.
通过切换临床磁共振成像(MRI)扫描仪的梯度场,磁性物体可以在人体的心血管系统内移动。其主要应用领域是靶向药物治疗或栓塞。这种设备的成功导航需要连续的位置确定。磁化率伪影的出现可用于此目的。本文研究了磁性微观物体和纳米颗粒在若干成像序列中对MRI图像形成过程的影响。提出了一种基于Bloch方程评估的MRI模拟器,并将其应用于伪影形成的仿真。此外,通过在临床MRI扫描仪上进行的实验研究了伪影特性,使用放置在琼脂糖凝胶幻影中的磁性物体。结果从凝胶幻影转移到真实的组织环境被证明。在此基础上,提出了一种两阶段视觉伺服控制方法。它是通过物体检测初始化的,在3D扫描中进行。通过模板匹配在快速二维扫描中进行目标跟踪。切片位置在反馈回路中自动调整,以便跟随垂直于图像平面的物体运动。
{"title":"Recognition and tracking of magnetic nanobots using MRI","authors":"T. Wortmann, C. Dahmen, C. Geldmann, S. Fatikow","doi":"10.1109/ISOT.2010.5687358","DOIUrl":"https://doi.org/10.1109/ISOT.2010.5687358","url":null,"abstract":"By switching the gradient fields of a clinical magnetic resonance imaging (MRI) scanner, magnetic objects may be moved inside the cardiovascular system of the human body. The main field of application is seen in targeted drug therapy or embolization. A successful navigation of such devices requires continuous position determination. The occurrence of magnetic susceptibility artifacts can be exploited for this purpose. This article studies the effect of magnetic microscopic objects and nanoparticles on the process of MRI image formation in several imaging sequences. An MRI simulator based on evaluation of the Bloch equation is presented and applied for the simulation of artifact formation. Also, artifact properties are studied by experiments carried out on clinical MRI scanners, using magnetic objects placed into an agarose gel phantom. The transferability of the results from the gel phantom to a real tissue environment is proven. Based on the results, a two-stage procedure for visual servoing is proposed. It is initialized by object detection, carried out in a 3D scan. Object tracking is performed on fast 2D scans by template matching. The slice position is adjusted automatically in a feedback loop in order to follow object movements perpendicular to the image plane.","PeriodicalId":91154,"journal":{"name":"Optomechatronic Technologies (ISOT), 2010 International Symposium on : 25-27 Oct. 2010 : [Toronto, ON]. International Symposium on Optomechatronic Technologies (2010 : Toronto, Ont.)","volume":"29 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89364032","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: 9
Detection of touch event with a camera-based user interface 使用基于摄像头的用户界面检测触摸事件
I. Fujieda, Y. Inoue, Masayuki Nishino
Three-dimensional coordinates of multiple fingers are acquired by a camera equipped with a fisheye lens and LEDs covered by a transparent hemispherical shell. Finger deformation induced by touch events is identified from the captured images, making the device compatible with the conventional mouse.
多个手指的三维坐标由配备鱼眼镜头的摄像头和覆盖在透明半球形外壳上的led获取。由触摸事件引起的手指变形可以从捕获的图像中识别出来,使该设备与传统的鼠标兼容。
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引用次数: 0
Smart wearable robot glasses for human visual augmentation based on human intention and scene understanding 基于人类意图和场景理解的智能可穿戴机器人眼镜
Hyun-Woo Kim, M. Y. Kim, Seung-Ho Yang, Kyo-Yeol Kim, H. Son, Yun-Jung Lee
This article focuses on the design and implementation of smart wearable robot glasses for human visual augmentation, which take a role to provide the refined visual recognition result to users of wearing the proposed system. The proposed system consists of a glass-type wearable device with a front looking camera, an eye looking camera, and an earphone, and signal processing units. The scene-analyzing process on the input image acquired by the front view camera is supported by an eye view camera of monitoring the eye position of user for efficient in formation processing, which is used to catch the user's visual intention and attention in given situations. The recognized results are transformed into the audio information for the user friendly information service without obstructing the users' own visual information gathering and processing, and then the result is transferred into the user earphone finally. This device can be used for the augmentation of human visual capability in various areas, museum, conference, meetings, etc. For the proposed device's feasibility, a series of experiments are performed, and the evaluation results are discussed in detail.
本文重点研究了用于人类视觉增强的智能可穿戴机器人眼镜的设计与实现,其作用是为佩戴本系统的用户提供精细的视觉识别结果。所提出的系统包括一个玻璃型可穿戴设备,该设备具有前置摄像头、前置摄像头和耳机,以及信号处理单元。对前视摄像头采集的输入图像进行场景分析,并辅以眼视摄像头对用户眼睛位置进行监控,有效地进行信息处理,捕捉用户在给定情况下的视觉意图和注意力。在不妨碍用户自身视觉信息采集和处理的情况下,将识别结果转换为音频信息,为用户提供友好的信息服务,最后将结果传输到用户耳机中。本设备可用于各种场所、博物馆、会议、会议等增强人的视觉能力。为了验证该装置的可行性,进行了一系列实验,并对评价结果进行了详细讨论。
{"title":"Smart wearable robot glasses for human visual augmentation based on human intention and scene understanding","authors":"Hyun-Woo Kim, M. Y. Kim, Seung-Ho Yang, Kyo-Yeol Kim, H. Son, Yun-Jung Lee","doi":"10.1109/ISOT.2010.5687362","DOIUrl":"https://doi.org/10.1109/ISOT.2010.5687362","url":null,"abstract":"This article focuses on the design and implementation of smart wearable robot glasses for human visual augmentation, which take a role to provide the refined visual recognition result to users of wearing the proposed system. The proposed system consists of a glass-type wearable device with a front looking camera, an eye looking camera, and an earphone, and signal processing units. The scene-analyzing process on the input image acquired by the front view camera is supported by an eye view camera of monitoring the eye position of user for efficient in formation processing, which is used to catch the user's visual intention and attention in given situations. The recognized results are transformed into the audio information for the user friendly information service without obstructing the users' own visual information gathering and processing, and then the result is transferred into the user earphone finally. This device can be used for the augmentation of human visual capability in various areas, museum, conference, meetings, etc. For the proposed device's feasibility, a series of experiments are performed, and the evaluation results are discussed in detail.","PeriodicalId":91154,"journal":{"name":"Optomechatronic Technologies (ISOT), 2010 International Symposium on : 25-27 Oct. 2010 : [Toronto, ON]. International Symposium on Optomechatronic Technologies (2010 : Toronto, Ont.)","volume":"29 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86719818","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: 4
期刊
Optomechatronic Technologies (ISOT), 2010 International Symposium on : 25-27 Oct. 2010 : [Toronto, ON]. International Symposium on Optomechatronic Technologies (2010 : Toronto, Ont.)
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