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检索条件"任意字段=International Conference on Signal Image Technology and Internet Based Systems"

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Generalized false discovery rate based adaptive thresholding approach for ECG signal compression

Generalized false discovery rate based adaptive thresholding...

引用

international conference on Medical Imaging, m-Health and Emerging Communication systems (MedCom)

作者： Supriya Rajankar Sanjay Talbar Department of Electronics and Telecommunication Sinhgad College of Engineering Pune India Department of Electronics and Telecommunication S. G. G. S. College of Engineering and Technology Nanded India

The paper proposes Generalized False Discovery Rate (FDR) based thresholding procedure for estimating wavelet coefficients adaptively to compress ECG signal. To determine the adaptive threshold the connection between thresholding and hypothesis testing is used. In the proposed algorithm False Discovery Threshold (FDT) is achieved by computing the probability of each detail coefficient. The computed probabilities are arranged in ascending order. The adaptive critical significance level is calculated by k-FWER and step up k-FDR procedures of multiple hypotheses testing. The significance levels are compared with computed probabilities to satisfy desired FDR, which provides the FDT. Finally two stage entropy coding is done using zero Run Length Encoding (RLE) followed by Huffman coding. As compared to existing techniques for ECG compression the proposed algorithms achieved very low average value of percentage root mean difference (PRD) at comparable compression ratios (CR). Very less PRD values signifies faithful reconstruction of original signal.

关键词： Electrocardiography Testing image reconstruction Encoding Discrete wavelet transforms Data compression

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An efficient estimation parameter method of bilateral filter using distribution distance

An efficient estimation parameter method of bilateral filter...

引用

IEEE Region 10 international conference TENCON

作者： Taiki Makishi Shuichi Ichikawa Tadashi Ogino Chikatoshi Yamada Dept. of Electronic and Communication Systems Engineering Okinawa National College of Technology905 Henoko Nago-shi Okinawa Japan Dept. of Electrical and Electronic Information Engineering Toyohashi University of Technology Aichi Japan Dept. of Information and Communication Systems Engineering Okinawa National College of Technology 905 Henoko Nago-shi Okinawa Japan

Bilateral Filter has properties of high noise removal. However, the estimating of suitable parameter by using an input image is required to obtain a fine denoising image. A method of parameter estimation using distribution distance has proposed. The method is optimal parameter estimation of bilateral filter based on distribution distance and assumption noise distribution that is estimated by differences between input and output images. However, there is problem if input images include many small edges. In this paper, we propose estimation of parameter using noise distribution that was estimated from estimation method that less susceptible to the original signal. Moreover, we show experimental results using proposed method.

关键词： Noise Estimation image edge detection Smoothing methods Laplace equations Bridges Educational institutions

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Comparison Study of Scheduling Strategies for Multi-user MIMO OFDM systems with Limited feedback

Comparison Study of Scheduling Strategies for Multi-user MIM...

引用

international conference image Processing, Computers and Industrial Engineering (ICICIE’2014, Kuala Lumpur)

作者： Krishna.P Kishan Rao.K Anil kumar.T SVS Institute of Technology Department of ECE Vaagdevi College of Engineering the ECE Department SR Engineering College

Scheduling schemes provide efficient support of multimedia services in multi-user MIMO OFDM wireless *** cellular systems the base station transmits a signal intended for single user in a particular resource *** efficient utilization of available bandwidth in a system essential in modem wireless systems such as video streaming and voice over internet protocol(VoIP),which demands for higher data *** the user feedback the channel state information in the network,base station to schedule the more than one user data in a single resource *** properly utilizing the feedback information,scheduling algorithms are designed which select pairs of users which would maximize system *** this paper,We describe and compare the scheduling algorithms to improve the system capacity and fairness among the users proposed for the 3GPP Long term evolution(LTE) systems.

关键词： MU-MIMO Bandwidth Limited Feedback 3GPPLTE

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A Hybrid Method for High Density Salt-and-Pepper Noise Removal

A Hybrid Method for High Density Salt-and-Pepper Noise Remov...

引用

9th international conference on signal-image technology and internet-based systems (SITIS)

作者： Inoue, Kohei Hara, Kenji Urahama, Kiichi Kyushu Univ Dept Commun Design Sci Fukuoka 812 Japan

ISBN: (纸本)9781479932115

Recently, two methods for removing high density salt-and-pepper noise in images have been proposed by Esakkirajan et al. and Hong et al. However, their methods have not been yet compared experimentally. In this paper, we compare them and show some experimental results. Additionally, we propose a hybrid method which is derived by combining the two methods, and experimentally show that the proposed method achieves higher values of both peak signal-to-noise ratio (PSNR) and image enhancement factor (IEF) than the two methods.

关键词： high density salt-and-pepper noise removal peak signal-to-noise ratio image enhancement factor hybrid method

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Subpixel spatial response of PMD pixels

Subpixel spatial response of PMD pixels

引用

IEEE international Workshop on Imaging systems and Techniques (IST)

作者： Miguel Heredia Conde Klaus Hartmann Otmar Loffeld Center for Sensorsystems (ZESS) University of Siegen Siegen Germany

Time-of-Flight cameras based on the Photonic Mixer Device (PMD) emit modulated light and perform a correlation between the light signal reflected by the scene and a reference signal at the pixel level in order to estimate the difference of phase between the emitted and received signals. Well known issues of this technology are the low lateral resolution and the limited and scene-dependent depth accuracy. Superresolution algorithms have been proposed that combine several low resolution depth images to obtain an enhanced high resolution result, or make use of a higher resolution intensity image that can be registered with the depth image. To the best of our knowledge, methods in the related literature seem to ignore systematically the fact that the correlating pixels used for phase-based ToF imagers -e.g., PMD pixels- exhibit a complex structure that might lead to a non-trivial response function in spatial domain. This fact, which is irrelevant when working at pixel level due to the symmetry of pixel structure, becomes of capital importance when working at subpixel level. Ignoring it means assuming a wrong sensing model, which leads to false (or noisy) high resolution recovered images. The aim of this work is to characterize the response function of PMD pixels in spatial domain with micrometric resolution and gather novel and valuable information about the PMD sensing process within the pixel. The results of our experiments clearly confirm our hypothesis about a complex response function and give insights about the origins of noise. Additionally, we obtain a spatial characterization of the crosstalk.

关键词： Correlation Logic gates Cameras signal resolution Spatial resolution Delays

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Segmentation of visual images under complex outdoor conditions

Segmentation of visual images under complex outdoor conditio...

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international conference on Communications and signal Processing

作者： T. Sathish kumar S. Pavya K. S. Rangasamy College of technology Namakal

Motion detection and segmentation of traffic vehicles in an outdoor environment, particularly under non ideal weather conditions, in the presence of camera noise and with variable or unfavorable luminance conditions is still an area of active research. Gaussian based background modeling is commonly used to detect moving objects in computer vision systems. However, it has some limitations it cannot effectively deal with sudden change in illumination, snowfall, fog, and repetitive motions such as swaying leaves. These nonideal outdoor conditions result in false motion detection. An alternative technique propose to detect and segment the moving vehicles by making use of dynamically adaptive threshold using the full-search sum of absolute difference (FSSAD) algorithm. Motion energy is obtained using sequence of frames that can be effectively be used to differentiate between moving vehicles and a dynamic background. Adaptive-motion threshold is used. It not only reduces the false motion but improves the computational efficiency as well.

关键词： Vehicles Meteorology Computational efficiency Algorithm design and analysis Filtering Manganese image resolution

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A New image Sharing Scheme for internet Applications in Adverse Environments

A New Image Sharing Scheme for Internet Applications in Adve...

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9th international conference on signal-image technology and internet-based systems (SITIS)

作者： Huang, Chin-Pan Huang, Ping S. Huang, Shih-Yu Ming Chuan Univ Dept Comp & Commun Engn Taoyuan Taiwan Ming Chuan Univ Dept Comp Sci & Inf Eng Taoyuan Taiwan

ISBN: (纸本)9781479932115

based on poly-phase sampling and lookup table encryption techniques, a new image sharing scheme is presented with several aspects of innovations in this paper. Each shadow can be independently decrypted to obtain part of the original image, any pair of decrypted sub-images has very high correlation, it still obtains acceptable image quality when channel congestion occurs, and quality refinement of the recovered image is proportional to number of shadows obtained and achieves perfectly with all shadows. As a result, our method is highly suitable for internet applications in adverse environments with real-time progressive reconstruction. Experimental results demonstrate the promising characteristics of our method.

关键词： Encryption image sharing Multiplierless operations Poly-phase sampling

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Millimeter-wave spotlight circular synthetic aperture radar (scsar) imaging for Foreign Object Debris on airport runway

Millimeter-wave spotlight circular synthetic aperture radar ...

引用

international conference on signal Processing Proceedings (ICSP)

作者： XunChao Cong JiangBo Liu KeYu Long YuLin Liu RongQiang Zhu Qun Wan University of Electronic Science and Technology of China Chengdu CN Civil Aviation Administration of China Beijing Beijing CN China Electronic System Engineering Company China

Foreign Object Debris (FOD) on airport runway is one of the greatest threats to aviation safety. The major characteristics of FOD are diversity and smallness. Synthetic aperture radar (SAR) has a natural advantage in high resolution imaging, and is, therefore, very suitable for small and weak targets imaging on airport runway. Firstly, a new millimeter-wave FOD imaging system called Spotlight Circular Synthetic Aperture Radar (SC-SAR) is introduced in this paper. The SC-SAR system not only can solve the practical limitations for ground-based applications but also fully exploit the advantage of existing ground-based SAR systems for FOD imaging. Secondly, based on the geometry and imaging principle of SC-SAR, the adjusted version of the Range-Doppler imaging formula was presented. Finally, the simulation results validate feasibility of SC-SAR imaging system and algorithm.

关键词： Imaging Synthetic aperture radar Radar imaging Azimuth image resolution Airports

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Research on sensing matrix characteristics in microwave staring correlated imaging based on compressed sensing

Research on sensing matrix characteristics in microwave star...

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IEEE international Workshop on Imaging systems and Techniques (IST)

作者： Yuanyue Guo Dongjin Wang Chao Tian Key Laboratory of Electromagnetic Space Information University of Science and Technology of China Hefei China

ISBN: (纸本)9781479952212

According to target sparsity in observation scene, a novel scheme of microwave staring correlated imaging based on compressed sensing (MSCI-CS) is proposed with its established imaging model. As its imaging base and key element, the formation and specific meaning and characteristics of sensing matrix of temporal-spatial stochastic radiation fields (SM-TSSRF) are analyzed, while a new average cross-correlation function of SM-TSSRF is defined to represent its whole correlation characteristics, as well as the standard judgment condition of target reconstruction. The influence and restraint of radar parameters on SM-TSSRF are discussed emphatically, including emitted signal bandwidth, radar array scale, radar system configuration and its aperture etc. Finally, numerical simulations verify the correctness of theoretical analysis of SM-TSSRF and its potentiality of sparse sampling and high-resolution imaging.

关键词： Radar imaging Imaging Arrays image reconstruction Bandwidth Correlation

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An MRF based abnormal event detection approach using motion and appearance features

An MRF based abnormal event detection approach using motion ...

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IEEE conference on Advanced Video and signal based Surveillance (AVSS)

作者： Hajananth Nallaivarothayan Clinton Fookes Simon Denman Sridha Sridharan Image and Video Laboratory Queensland University of Technology Brisbane Australia

Abnormal event detection has attracted a lot of attention in the computer vision research community during recent years due to the increased focus on automated surveillance systems to improve security in public places. Due to the scarcity of training data and the definition of an abnormality being dependent on context, abnormal event detection is generally formulated as a data-driven approach where activities are modeled in an unsupervised fashion during the training phase. In this work, we use a Gaussian mixture model (GMM) to cluster the activities during the training phase, and propose a Gaussian mixture model based Markov random field (GMM-MRF) to estimate the likelihood scores of new videos in the testing phase. Further-more, we propose two new features: optical acceleration, and the histogram of optical flow gradients; to detect the presence of any abnormal objects and speed violations in the scene. We show that our proposed method outperforms other state of the art abnormal event detection algorithms on publicly available UCSD dataset.

关键词： Feature extraction Optical imaging Vectors Acceleration Hidden Markov models Histograms Event detection

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