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2014 IEEE International Conference on Image Processing (ICIP)最新文献

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Marked point process model for facial wrinkle detection 面部皱纹检测的标记点过程模型
Pub Date : 2014-10-27 DOI: 10.1109/ICIP.2014.7025278
Seong-Gyun Jeong, Y. Tarabalka, J. Zerubia
We propose a new model for wrinkle detection in human faces using a marked point process. In order to detect an arbitrary shape of wrinkles, we represent them as a set of line segments, where each segment is characterized by its length and orientation. We propose a probability density of wrinkle model which exploits local edge profile and geometric properties of wrinkles. To optimize the probability density of wrinkle model, we employ reversible jump Markov chain Monte Carlo sampler with delayed rejection. Experimental results demonstrate that the new algorithm detects facial wrinkles more accurately than a recent state-of-the-art method.
提出了一种基于标记点的人脸皱纹检测新模型。为了检测任意形状的皱纹,我们将它们表示为一组线段,其中每个线段都具有其长度和方向的特征。提出了一种利用局部边缘轮廓和皱褶几何特性的概率密度皱褶模型。为了优化皱纹模型的概率密度,我们采用了可逆跳跃马尔可夫链蒙特卡罗延迟抑制采样器。实验结果表明,新算法比目前最先进的方法更准确地检测面部皱纹。
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引用次数: 19
Global scheme for iterative mojette reconstructions 迭代mojette重建的全局方案
Pub Date : 2014-10-27 DOI: 10.1109/ICIP.2014.7025350
B. Recur, H. D. Sarkissian, M. Servieres
In this paper, we develop a global iterative algorithm for tomographic reconstructions from Mojette projections. Since Spline-Mojette projections are obtained by convolving Dirac-Mojette values with a specific uniform projection kernel, we decorrelate iterative reconstructions from projection model and provide a global scheme available for all Mojette models. We refer iterative algorithms to their Radon based counterparts and propose a comparative study from several Mojette acquisitions.
本文提出了一种基于Mojette投影的层析重建的全局迭代算法。由于Spline-Mojette投影是通过将Dirac-Mojette值与特定的均匀投影核进行卷积得到的,因此我们将投影模型的迭代重建解相关,并提供了一种适用于所有Mojette模型的全局方案。我们将迭代算法与基于氡的算法相比较,并对Mojette的几项收购进行了比较研究。
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引用次数: 0
Geodesics-based statistical shape analysis 基于测地线的统计形状分析
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025962
Michel Abboud, A. Benzinou, K. Nasreddine, M. Jazar
In this paper, we describe a statistical shape analysis founded on a robust elastic metric. The proposed metric is based on geodesics in the shape space. Using this distance, we formulate a variational setting to estimate intrinsic mean shape viewed as the perfect pattern to represent a set of given shapes. By applying a geodesic-based shape warping, we generate a principal component analysis (PCA) able to capture nonlinear shape variability. Indeed, the proposed approach better reflects the main modes of variability of the data. Therefore, characterizing dominant modes of individual shape variations is conducted well through the reconstruction process. We demonstrate the efficiency of our approach with an application on a GESTURES database.
在本文中,我们描述了一种基于鲁棒弹性度量的统计形状分析。所提出的度量是基于形状空间中的测地线。利用这个距离,我们制定了一个变分设置来估计被视为代表一组给定形状的完美模式的内在平均形状。通过应用基于测地线的形状翘曲,我们生成了一个能够捕获非线性形状变化的主成分分析(PCA)。实际上,所提出的方法更好地反映了数据的主要变异性模式。因此,通过重建过程可以很好地表征个体形状变化的主导模式。我们用一个基于手势数据库的应用程序演示了这种方法的效率。
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引用次数: 3
Joint video fusion and super resolution based on Markov random fields 基于马尔可夫随机场的联合视频融合与超分辨率
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025431
Jin Chen, J. Núñez-Yáñez, A. Achim
In this paper, a joint video fusion and super-resolution algorithm is proposed. The method addresses the problem of generating a high-resolution (HR) image from infrared (IR) and visible (VI) low-resolution (LR) images, in a Bayesian framework. In order to preserve better the discontinuities, a Generalized Gaussian Markov Random Field (MRF) is used to formulate the prior. Experimental results demonstrate that information from both visible and infrared bands is recovered from the LR frames in an effective way.
本文提出了一种视频融合和超分辨率联合算法。该方法解决了在贝叶斯框架中从红外(IR)和可见光(VI)低分辨率(LR)图像生成高分辨率(HR)图像的问题。为了更好地保留不连续性,使用广义高斯马尔可夫随机场(MRF)来表示先验。实验结果表明,该方法可以有效地恢复可见光和红外波段的信息。
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引用次数: 4
MasterCam FVV: Robust registration of multiview sports video to a static high-resolution master camera for free viewpoint video MasterCam FVV:多视图运动视频的健壮注册到一个静态的高分辨率主相机免费视点视频
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025705
Florian Angehrn, Oliver Wang, Yagiz Aksoy, M. Gross, A. Smolic
Free viewpoint video enables interactive viewpoint selection in real world scenes, which is attractive for many applications such as sports visualization. Multi-camera registration is one of the difficult tasks in such systems. We introduce the concept of a static high resolution master camera for improved long-term multiview alignment. All broadcast cameras are aligned to a common reference. Our approach builds on frame-to-frame alignment, extended into a recursive long-term estimation process, which is shown to be accurate, robust and stable over long sequences.
免费视点视频可以在现实世界场景中进行交互式视点选择,这对于许多应用程序(如体育可视化)具有吸引力。多相机配准是这类系统的难点之一。我们介绍了静态高分辨率主相机的概念,以改善长期多视图对准。所有的广播摄像机都对准一个共同的参考点。我们的方法建立在帧对帧对齐的基础上,扩展为递归的长期估计过程,该过程在长序列上被证明是准确、鲁棒和稳定的。
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引用次数: 6
Decoder complexity reduction for the scalable extension of HEVC 解码器复杂性降低为HEVC的可扩展扩展
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025757
Christian Feldmann, Fabian Jäger, M. Wien
In the current standardization process of the scalable extension to High Efficiency Video Coding (SHVC) a high level syntax multi-loop approach is close to completion. On the one hand this multi-loop approach offers a reasonable rate-distortion performance while only minimal modifications to the encoder and decoder in both layers are required. On the other hand this approach requires full reconstruction of all pictures of all layers at the decoder side which, in the case of quality scalability with two layers, doubles the decoder complexity. In this paper high layer modifications to the prediction structure similar to the scalable extension of H.264 - AVC are implemented in SHVC and studied. These modifications allow for an enhancement layer decoder implementation to skip a significant amount of motion compensation and deblocking operations in the base layer. It is shown that the decoder complexity can hereby be reduced up to 55% for the random access configuration and up to 64% for the low delay configuration compared to SHVC. An overall coding performance increase of 1.2% when decoding the enhancement layer is reported while when only decoding the base layer a drift can be observed between -0.16 dB for random access and -0.39 dB for low delay.
在当前高效视频编码(High Efficiency Video Coding, SHVC)可扩展的标准化进程中,一种高级语法多循环方法已接近完成。一方面,这种多环路方法提供了合理的率失真性能,同时只需要对两层的编码器和解码器进行最小的修改。另一方面,这种方法需要在解码器端完全重建所有层的所有图片,在两层的质量可扩展性的情况下,解码器的复杂性增加了一倍。本文在SHVC中实现了类似于H.264 - AVC可伸缩扩展的预测结构的高层修改,并对其进行了研究。这些修改允许增强层解码器实现在基础层中跳过大量的运动补偿和块化操作。结果表明,与SHVC相比,随机接入配置的解码器复杂度可降低55%,低延迟配置的解码器复杂度可降低64%。据报道,当解码增强层时,总体编码性能提高了1.2%,而当仅解码基础层时,可以观察到随机访问时的-0.16 dB和低延迟时的-0.39 dB之间的漂移。
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引用次数: 5
Multiple-model Bayesian approach to volumetric imaging of cardiac current sources 心脏电流源体积成像的多模型贝叶斯方法
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025715
A. Rahimi, Jingjia Xu, Linwei Wang
Noninvasive cardiac electrophysiological imaging aims to mathematically reconstruct the spatio-temporal dynamics of cardiac current sources from body-surface electrocardiography data. This ill-posed problem is often regularized by imposing a certain constraining model on the solution. However, it enforces the source distribution to follow a pre-assumed spatial structure that does not always match the spatio-temporal changes of current sources. We propose a Bayesian approach for 3D current source estimation that consists of a continuous combination of multiple models, each reflecting a specific spatial property for current sources. Multiple models are incorporated into our Bayesian approach as an Lp-norm prior for current sources, where p is an unknown hyperparameter with prior probabilistic distribution defined over the range between 1 and 2. The current source estimation is then obtained as an optimally weighted combination of solutions across all models, the weight being determined from posterior distribution of p inferred from electrocardiography data. The performance of our proposed approach is assessed in a set of synthetic and real-data experiments on human heart-torso models. While the use of fixed models such as L1- and L2-norm only properly recovers sources with specific spatial structures, our method delivers consistent performance in reconstructing sources with different extents and structures.
无创心脏电生理成像旨在从体表心电图数据中以数学方式重建心脏电流源的时空动态。这种病态问题通常通过在解上施加一定的约束模型来正则化。然而,它强制源分布遵循预先假设的空间结构,并不总是与当前源的时空变化相匹配。我们提出了一种用于三维电流源估计的贝叶斯方法,该方法由多个模型的连续组合组成,每个模型都反映了电流源的特定空间属性。多个模型被纳入我们的贝叶斯方法中,作为电流源的lp范数先验,其中p是一个未知的超参数,其先验概率分布定义在1到2之间。然后获得电流源估计,作为所有模型中解决方案的最佳加权组合,权重由从心电图数据推断的p的后验分布确定。我们提出的方法的性能在人类心脏躯干模型上的一组合成和真实数据实验中进行了评估。虽然使用固定模型(如L1-范数和l2 -范数)只能正确地恢复具有特定空间结构的源,但我们的方法在重建具有不同范围和结构的源时具有一致的性能。
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引用次数: 0
Simultaneous bias correction and image segmentation via L0 regularized Mumford-Shah model 基于L0正则化Mumford-Shah模型的同时偏差校正和图像分割
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025000
Y. Duan, Huibin Chang, Weimin Huang, Jiayin Zhou
This paper presents a novel discrete Mumford-Shah model for the simultaneous bias correction and image segmentation(SBCIS) for images with intensity inhomogeneity. The model is based on the assumption that an image can be approximated by a product of true intensities and a bias field. Unlike the existing methods, where the true intensities are represented as a linear combination of characteristic functions of segmentation regions, we employ L0 gradient minimization to enforce a piecewise constant solution. We introduce a new neighbor term into the Mumford-Shah model to allow the true intensity of a pixel to be influenced by its immediate neighborhood. A two-stage segmentation method is applied to the proposed Mumford-Shah model. In the first stage, both the true intensities and bias field are obtained while the segmentation is done using the K-means clustering method in the second stage. Comparisons with the two-stage Mumford-Shah model show the advantages of our method in its ability in segmenting images with intensity inhomogeneity.
本文提出了一种新的离散Mumford-Shah模型,用于强度不均匀图像的同时偏差校正和图像分割(SBCIS)。该模型是基于这样一个假设,即图像可以近似为真实强度和偏置场的乘积。与现有的方法不同,在现有方法中,真实强度被表示为分割区域特征函数的线性组合,我们使用L0梯度最小化来强制分段常数解。我们在Mumford-Shah模型中引入了一个新的邻居项,以允许像素的真实强度受到其直接邻居的影响。对所提出的Mumford-Shah模型采用了两阶段分割方法。在第一阶段,获得真实强度和偏置场,在第二阶段,使用K-means聚类方法进行分割。与两阶段Mumford-Shah模型的比较表明,我们的方法在分割具有强度不均匀性的图像方面具有优势。
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引用次数: 13
Cleaning up after a face tracker: False positive removal 面部追踪器后的清理:假阳性去除
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025050
Makarand Tapaswi, Cemal Cagn Corez, M. Bäuml, H. K. Ekenel, R. Stiefelhagen
Automatic person identification in TV series has gained popularity over the years. While most of the works rely on using face-based recognition, errors during tracking such as false positive face tracks are typically ignored. We propose a variety of methods to remove false positive face tracks and categorize the methods into confidence- and context-based. We evaluate our methods on a large TV series data set and show that up to 75% of the false positive face tracks are removed at the cost of 3.6% true positive tracks. We further show that the proposed method is general and applicable to other detectors or trackers.
近年来,电视连续剧中的自动人物识别越来越受欢迎。虽然大多数工作依赖于基于人脸的识别,但跟踪过程中的错误,如假阳性的人脸跟踪通常被忽略。我们提出了多种方法来去除假阳性的人脸轨迹,并将这些方法分为基于置信度和基于上下文。我们在一个大型电视连续剧数据集上评估了我们的方法,结果表明,以3.6%的真阳性轨迹为代价,高达75%的假阳性人脸轨迹被去除。进一步证明了该方法具有通用性,适用于其他检测器或跟踪器。
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引用次数: 9
A contrario detection of good continuation of points 一个反向检测点的良好延续
Pub Date : 2014-10-01 DOI: 10.1109/ICIP.2014.7025964
José Lezama, R. G. V. Gioi, G. Randall, J. Morel
We will consider the problem of detecting configurations of points regularly spaced and lying on a smooth curve. This corresponds to the notion of good continuation introduced in the Gestalt theory. We present a robust algorithm for clustering points along such curves, whilst at the same time discarding noisy samples. Based on the a contrario methodology, the detector builds upon a simple, symmetric primitive for a triplet of points, and finds statistically meaningful chains of such triplets. An efficient implementation is proposed using the Floyd-Warshall algorithm. Experiments on synthetic and real data show that the method is able to identify the perceptually relevant configuration of points in good continuation.
我们将考虑检测位于光滑曲线上的规则间隔点的构型的问题。这与格式塔理论中引入的良好延续的概念相对应。我们提出了一种鲁棒的算法,用于沿着这些曲线聚类点,同时丢弃有噪声的样本。基于反向方法,检测器建立在一个简单的,对称的三个点的原语上,并找到这些三个点的统计意义链。提出了一种使用Floyd-Warshall算法的有效实现方法。在合成数据和实际数据上的实验表明,该方法能够识别出具有良好连续性的感知相关点的组态。
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引用次数: 5
期刊
2014 IEEE International Conference on Image Processing (ICIP)
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