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2013 Fourth National Conference on Computer Vision, Pattern Recognition, Image Processing and Graphics (NCVPRIPG)最新文献

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Image deblurring in super-resolution framework 超分辨率框架下的图像去模糊
Srimanta Mandal, A. Sao
In all image processing applications, it is important to extract the appropriate information from an image. But often the captured image is not clear enough to give the required information due to the imaging environment. Thus, it is essential to enhance the clarity of the image by some post-processing techniques. Image deblurring is one of such techniques to remove the blurry effect of the captured image. This paper looks into this problem in a different way, where the deblurring of an image is addressed by solving image super-resolution problem. The blurred image is first down-sampled and then it is fed to the super-resolution framework to produce the deblurred high resolution image. In addition, the proposed approach states the requirement of edge preservation in the problem. The experimental results are comparable with the existing image deblurring algorithms.
在所有的图像处理应用中,从图像中提取适当的信息是很重要的。但由于成像环境的原因,通常捕获的图像不够清晰,无法提供所需的信息。因此,通过一些后处理技术来增强图像的清晰度是很有必要的。图像去模糊是一种消除所捕获图像模糊效果的技术。本文从另一个角度来研究这一问题,即通过解决图像超分辨率问题来解决图像的去模糊问题。首先对模糊图像进行下采样,然后将其送入超分辨率框架,产生去模糊的高分辨率图像。此外,该方法还说明了问题中边缘保持的要求。实验结果与现有图像去模糊算法具有可比性。
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引用次数: 0
Mean shift clustering based outlier removal for global motion estimation 基于均值移位聚类的全局运动估计离群值去除
M. Okade, P. Biswas
This paper investigates a novel motion vector outlier rejection method based on using mean shift clustering on block motion vectors. The accuracy of compressed domain global motion estimation techniques is largely influenced by its ability to counter the outlier motion vectors. These outliers occur in the block motion vector field due to moving objects, noise or due to large matching errors as a result of the encoders priority on rate distortion optimization. In the present work it is shown that by using mean shift clustering on block motion vectors, those clusters which correspond to outlier motion vectors can be identified. Once detected these clusters are kept out of the global motion estimation process thereby increasing the robustness of estimated camera parameters. The proposed method is compared with existing state-of-the-art outlier removal methods using synthetic and real video sequences to establish and validate its superiority.
本文研究了一种基于块运动矢量上的均值偏移聚类的运动矢量离群值抑制方法。压缩域全局运动估计技术的精度很大程度上取决于其对抗离群运动矢量的能力。这些异常值出现在块运动矢量场中,这是由于移动物体、噪声或由于编码器优先考虑速率失真优化而导致的大匹配误差。在本工作中,通过对块运动向量使用均值移位聚类,可以识别出与离群运动向量对应的聚类。一旦检测到这些集群被排除在全局运动估计过程之外,从而增加了估计相机参数的鲁棒性。将该方法与现有的基于合成和真实视频序列的离群值去除方法进行了比较,验证了该方法的优越性。
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引用次数: 3
A feature information based approach for enhancing score-level fusion in multi-sample biometric systems 一种基于特征信息的多样本生物识别系统分数级融合增强方法
Sandeep Puthanveetil Satheesan, S. Tulyakov, V. Govindaraju
Matching score fusion is a commonly used technique for improving the performance of biometric systems. In this paper we investigate the methods for fusing the scores obtained from matching individual video frames to a stored face template. Traditional fusion rules like sum and product does not account for the diversity of information contained in consecutive frames. Instead, we propose to use a quantitative measure of the shared information content between adjacent frame pairs to capture this information and enhance the score fusion performance. We conduct our experiments in a database of 132 person videos. The results show that application of information content to score level fusion can increase the performance of a fusion algorithm and hence make it more robust to errors. The developed matching score fusion method can be applied to other systems involving the multiple biometric samples or scans.
匹配分数融合是提高生物识别系统性能的常用技术。在本文中,我们研究了融合从匹配单个视频帧获得的分数到存储的人脸模板的方法。传统的融合规则,如求和和乘积,并没有考虑到连续帧中包含的信息的多样性。相反,我们建议使用相邻帧对之间共享信息内容的定量度量来捕获这些信息并提高分数融合性能。我们在一个包含132个人视频的数据库中进行实验。结果表明,将信息含量应用到分数融合中可以提高融合算法的性能,从而使融合算法对误差具有更强的鲁棒性。所开发的匹配分数融合方法可以应用于涉及多个生物特征样本或扫描的其他系统。
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引用次数: 2
Fuzzy video summarization using key frame extraction 基于关键帧提取的模糊视频摘要
Aditi Kapoor, K. K. Biswas, M. Hanmandlu
In this paper we propose to summarize videos based on key frames. We improve upon the histogram and pixel difference based approach with fuzzy rule based approach and also give a new approach which reduces the computation of framewise differences. We test our methods using fidelity ratio and compression ratio on videos of sports from YouTube and UCF sports dataset, videos of commercials and sitcoms. The results of our methods are seen to be comparable to other state of the art approaches.
本文提出了一种基于关键帧的视频总结方法。我们将基于直方图和像素差的方法改进为基于模糊规则的方法,并提出了一种减少帧间差计算的新方法。我们使用来自YouTube和UCF体育数据集的体育视频、商业视频和情景喜剧视频的保真度比和压缩比来测试我们的方法。我们的方法的结果被认为可以与其他最先进的方法相媲美。
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引用次数: 1
A density based method for automatic hairstyle discovery and recognition 一种基于密度的发型自动发现与识别方法
Jyotikrishna Dass, Monika Sharma, Ehtesham Hassan, Hiranmay Ghosh
This paper presents a novel method for discovery and recognition of hairstyles in a collection of colored face images. We propose the use of Agglomerative clustering for automatic discovery of distinct hairstyles. Our method proposes automated approach for generation of hair, background and face-skin probability-masks for different hairstyle category without requiring manual annotation. The probability-masks based density estimates are subsequently applied for recognizing the hairstyle in a new face image. The proposed methodology has been verified with a synthetic dataset of approximately thousand images, randomly collected from the Internet.
本文提出了一种从彩色人脸图像中发现和识别发型的新方法。我们建议使用聚集聚类来自动发现不同的发型。我们的方法提出了一种自动生成不同发型类别的头发、背景和面部皮肤概率面具的方法,而无需手动注释。然后将基于概率掩模的密度估计应用于新人脸图像的发型识别。所提出的方法已经通过从互联网上随机收集的大约一千张图像的合成数据集进行了验证。
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引用次数: 13
Surface fitting in SPECT imaging useful for detecting Parkinson's Disease and Scans Without Evidence of Dopaminergic Deficit 表面拟合的SPECT成像有用的检测帕金森病和扫描无证据的多巴胺能缺陷
R. Prashanth, Sumantra Dutta Roy, P. Mandal, Shantanu Ghosh
Dopaminergic imaging using Single Photon Emission Computed Tomography (SPECT) with 123I-Ioflupane have shown to increase the diagnostic accuracy in Parkinson's Disease (PD). Studies show that around 10% of subjects who are clinically diagnosed as PD, have SPECT scans in the normal range and are called Scans Without Evidence of Dopaminergic Deficit (SWEDD) subjects. Subsequent follow-up on these subjects has indicated that they are unlikely to have PD. Detection and differentiation of PD and SWEDD is problematic in the early stages of the disease. Early and accurate diagnosis of PD and also SWEDD is crucial for early management, avoidance of unnecessary medical examinations and therapies; and their side-effects. We in our paper, use the SPECT images from 35 Normal, 36 PD and 38 SWEDD subjects as obtained from the Parkinson's Progression Markers Initiative (PPMI) database, to carry out intensity-based surface fitting using polynomial model. This is the first time that such kind of modeling is carried out on the SPECT images for the characterization of PD. Our results show that the surface profile in terms of model coefficients and goodness-of-fit parameters is different for Normal, Early PD and SWEDD subjects. Such kind of modeling may aid in the diagnosis of early PD and SWEDD from SPECT images.
使用含有123i -碘氟烷的单光子发射计算机断层扫描(SPECT)进行多巴胺能成像可以提高帕金森病(PD)的诊断准确性。研究表明,在临床诊断为PD的受试者中,约有10%的人的SPECT扫描在正常范围内,被称为无多巴胺能缺陷证据扫描(SWEDD)受试者。对这些受试者的后续随访表明,他们不太可能患有帕金森病。PD和SWEDD的检测和鉴别在疾病的早期是有问题的。PD和SWEDD的早期准确诊断对于早期管理,避免不必要的医学检查和治疗至关重要;还有它们的副作用。在我们的论文中,我们使用从帕金森进展标记计划(PPMI)数据库中获得的35名正常,36名PD和38名SWEDD受试者的SPECT图像,使用多项式模型进行基于强度的表面拟合。这是第一次在SPECT图像上进行这种建模来表征PD。我们的研究结果表明,正常、早期PD和SWEDD受试者的模型系数和拟合优度参数的表面轮廓不同。这种模型可以帮助从SPECT图像中诊断早期PD和SWEDD。
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引用次数: 3
An improvement on thinning to handle characters with noisy contour 一种改进的细化方法以处理带有噪声轮廓的字符
Soumyadeep Ghosh, Soumen Bag
Thinning is an important preprocessing operation used in different document image processing and analysis applications. The main objective of thinning is to obtain single-pixel thin skeleton without any shape distortion. It is noticed that documents written in ink-sketch pens and scanned with high precision scanners suffer from high degree of unevenness on their outer surfaces. This unevenness results in severe distortions in the shapes of thinned images, which makes them unsuitable for efficient recognition. These distortions are mainly two types namely, spurious loops and spurious strokes. Our proposed algorithm gets rid of these distortions in the thinned image. We have tested our approach on our own data set of about 1500 characters and have got promising results.
细化是各种文档图像处理和分析应用中重要的预处理操作。细化的主要目的是获得无任何形状畸变的单像素薄骨架。我们注意到,用水墨笔书写的文件和用高精度扫描仪扫描的文件,其外表面存在高度的不平整。这种不均匀性导致薄图像的形状严重失真,使其不适合有效识别。这些扭曲主要有两种类型,即虚假循环和虚假笔划。我们提出的算法消除了薄图像中的这些畸变。我们已经在我们自己的大约1500个字符的数据集上测试了我们的方法,并得到了很好的结果。
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引用次数: 1
Evolutionary design of Multiquadric radial basis functions neural network for face recognition 多二次径向基函数神经网络人脸识别的进化设计
Vandana Agarwal, S. Bhanot
In this paper, it is proposed to use Multiquadric basis functions at hidden layer of radial basis functions neural networks (RBFNN) for face recognition. The performance of RBFNN depends on the design of the structure of RBFNN, which includes optimal center selection and spread of RBF units, number of neurons at hidden layer, weights etc. Design of hidden layer of RBFNN also includes the choice of basis functions which is proposed to be of Multiquadric basis functions. The shape of Multiquadric basis function plays an important role in the performance of RBFNN in face recognition. A novel evolutionary shape parameter optimization technique inspired by the attractiveness of the natural fireflies is proposed and is used in the design of Multiquadric basis functions for the given face database. The algorithm is tested on two benchmarked face databases ORL and Indian face databases. The proposed technique significantly outperforms the performance of the Gaussian basis functions based RBFNN in terms of face recognition accuracy.
本文提出在径向基函数神经网络(RBFNN)的隐层使用多重二次基函数进行人脸识别。RBFNN的性能取决于RBFNN的结构设计,包括RBF单元的最优中心选择和扩展、隐藏层神经元的数量、权值等。RBFNN隐层的设计还包括基函数的选择,提出了多二次基函数的选择。多二次基函数的形状对RBFNN在人脸识别中的性能起着重要的作用。提出了一种受自然萤火虫吸引力启发的进化形状参数优化技术,并将其应用于给定人脸数据库的多二次基函数设计。在ORL和印度两个基准人脸数据库上对该算法进行了测试。该方法在人脸识别精度方面明显优于基于高斯基函数的RBFNN。
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引用次数: 3
Image denoising using redundant finer directional wavelet transform 利用冗余细定向小波变换对图像进行去噪
Shrishail S. Gajbhar, M. Joshi
In this paper, we propose two designs of redundant finer directional wavelet transform (FiDWT) and explain its application to image denoising. 2-channel perfect reconstruction (PR) checkerboard-shaped filter bank (CSFB) is at the core of the designs. The 2-channel CSFB, uses 2-D nonseparable analysis and synthesis filter responses without downsampling/upsampling matrices resulting in redundancy factor of 2. Both these designs have two lowpass and six highpass directional subbands. The hard-thresholding results for image denoising using proposed designs clearly shows improvement in PSNR as well as visual quality of the denoised images. Using the Bayes least squares-Gaussian scale mixture (BLS-GSM), a current state-of-the-art wavelet-based image denoising technique with the proposed two times redundant FiDWT design indicates encouraging results on textural images with much less computational cost.
本文提出了两种冗余细定向小波变换(FiDWT)的设计,并说明了其在图像去噪中的应用。2通道完全重构(PR)棋盘形滤波器组(CSFB)是设计的核心。2通道CSFB使用二维不可分离分析和合成滤波器响应,没有下采样/上采样矩阵,导致冗余系数为2。这两种设计都有两个低通和六个高通方向子带。使用所提出的设计进行图像去噪的硬阈值结果清楚地显示了PSNR的改善以及去噪图像的视觉质量。使用贝叶斯最小二乘高斯尺度混合(BLS-GSM),当前最先进的基于小波的图像去噪技术与提出的两倍冗余FiDWT设计在纹理图像上显示出令人鼓舞的结果,且计算成本更低。
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引用次数: 1
A new Motion Estimation Technique for video compression 一种新的视频压缩运动估计技术
K. V. Arya, P. Prasad
The popular techniques to eliminate temporal redundancy in video sequences are Motion Estimation and Motion Compensation. These techniques have also been used in popular H.264, MPEG-2 and MPEG-4 video coding standards. Conventional fast Block Matching Algorithms (BMA) perform exhaustive search between the current and the reference frame. Although BMA technique gives the exact result but it is computationally very expensive. Another drawback of this method is that it easily gets trapped into the local minima which eventually lead to degradation of the video quality. The proposed Motion Estimation Technique exploits the fact that the human eyes are incapable of detecting different frames when they are run at particular frame rate. The experimental results on various video sequences demonstrate that the proposed technique has outperformed all the existing conventional motion estimation techniques.
消除视频序列中时间冗余的常用技术是运动估计和运动补偿。这些技术也被用于流行的H.264、MPEG-2和MPEG-4视频编码标准。传统的快速块匹配算法(BMA)在当前帧和参考帧之间进行穷举搜索。虽然BMA技术给出了精确的结果,但它在计算上非常昂贵。这种方法的另一个缺点是它很容易陷入局部最小值,最终导致视频质量下降。提出的运动估计技术利用人眼在特定帧速率下无法检测不同帧的事实。在各种视频序列上的实验结果表明,该方法优于现有的传统运动估计技术。
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引用次数: 2
期刊
2013 Fourth National Conference on Computer Vision, Pattern Recognition, Image Processing and Graphics (NCVPRIPG)
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