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Frame Interpolation Method Based on Adaptive Threshold and Adjacent Pixels

Frame Interpolation Method Based on Adaptive Threshold and A...

引用

International Conference on Intelligent Information Hiding and Multimedia signal processing (IIHMSP)

作者： Hyeongchul Oh Joohyun Lee Changki Min Jechang Jeong Image Communication and Signal Processing Laboratory Department of Electrical and Computer Engineering Hanyang University Seoul South Korea

This paper presents a frame interpolation algorithm using the motion information of some object within the estimated blocks. The proposed algorithm uses two initial frames that are generated based on the backward and forward frames using the motion vectors. In this process, the occlusion regions are occurred in two initial frames since the optimal block is only selected by threshold. Furthermore, the regions are irregularly appeared because of that the selected block is interpolated on half position between the estimated motion vectors. Two initial frames are merged to interpolate the occlusion regions. Also, the occlusion areas, which are still existence in the merged frame, are interpolated by using the neighboring pixel information and the available data in the occlusion block. In this paper, the experimental results show that the performance of the proposed algorithm has better PSNR and the visual quality than the conventional algorithms.

关键词： Pixel PSNR Interpolation Visualization Motion compensation Algorithm design and analysis Motion estimation

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A fast image registration algorithm for Digital Subtraction Angiography

A fast image registration algorithm for Digital Subtraction ...

引用

Iranian Conference of Biomedical engineering (ICBME)

作者： Mansour Nejati Rassoul Amirfattahi Saeed Sadri Digital Signal Processing Research Laboratory Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran

Digital Subtraction Angiography (DSA) is a powerful technique for the visualization of blood vessels. The major problem encountered in DSA images is the presence of motion artifacts which arise from the misalignment of successive images in the sequence. In this paper, a fast registration algorithm for coronary angiographic images is proposed. It involves a feature-based selection of control points for which the displacement is computed by means of template matching, and the complete displacement vector field is constructed by means of interpolation. To reduce the computational cost of the template matching procedure, an iterative hill-climbing approach is used for optimization and for handling the local misalignments, the image warping is performed based on multilevel B-spline interpolation.

关键词： Image edge detection Artificial neural networks Interpolation Pixel

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Motion Compensated Frame Interpolation Using Adaptive Adjacency Pixel Information

Motion Compensated Frame Interpolation Using Adaptive Adjace...

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International Conference on computer Graphics, Imaging and Visualization, CGIV

We propose an adaptive motion compensated frame interpolation scheme which is capable of developing a frame rate from a lower number into a higher number and a decoded video quality at the decoder. The proposed algorithm utilizes the preliminary frames of the forward and backward directions using bilateral prediction. In the processing of the preliminary frames, an additional interpolation is performed to fill the occlusion areas. If the calculated values between the reference and current frames are larger than the predetermined threshold, the block is chosen as the occlusion area. In addition, we performed a re-search in order to acquire the best blocks, taking into account the number of available adjacent blocks for the occlusion areas. The experimental results show that the performance of the proposed algorithm has better PSNR and visual quality than those of the conventional methods.

关键词： Interpolation Pixel Robustness PSNR Motion estimation Algorithm design and analysis Motion compensation

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A signal perturbation free semi-blind MRT MIMO channel estimation approach

A signal perturbation free semi-blind MRT MIMO channel estim...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Chung Chen Wei-Ping Zhu Qingmin Meng Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing China Center of Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, an efficient signal-perturbation-free semi-blind approach is proposed for flat-fading channel estimation of multiple-input multiple-output (MIMO) systems with maximum ratio transmission (MRT). A novel transmit scheme is developed based on the eigenvalue decomposition of the correlation matrix of the transmitted signal. The new scheme is to send a small volume of data bearing the information of the correlation matrix to the receiver for the cancellation of the signal perturbation error. computer simulations show that the proposed approach significantly outperforms the closed-form semiblind estimation method (CFSB) in terms of the MSE of the beamforming vector estimate.

关键词： MIMO Channel estimation signal processing Array signal processing Matrix decomposition Transmitters Eigenvalues and eigenfunctions computer errors Random variables Receiving antennas

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Automatic segmentation of pallet images using the 2-D wavelet transform and YUV color space

Automatic segmentation of pallet images using the 2-D wavele...

引用

Iranian Conference on electrical engineering (ICEE)

作者： Aida Fooladivanda Narges Chehrerazi Saeed Sadri Rasoul Amirfattahi Mohammad Ali Montazeri Digital signal processing research Laboratory Department of Electrical and computer engineering Isfahan University of Technology Isfahan Iran

ISBN: (纸本)9781424467600

Segmentation is an important stage in automatic digital image processing. A special case of segmentation is to segment objects from their background. Among different segmentation algorithm for object detection, learning based approach is widely applied. In steel industry, pallets are moving on a rail. They have high resolution details in their structure and the image of a pallet taken by a camera in real time suffers from severe noise and illumination variations. The purpose of this paper is to segment the pallet from a frame of a sequence of video images, such that the pallet is segmented without degradation of resolution. We use the pallet image in YUV color space together with wavelet transform (WT) for detection. For classification Support Vector Machine (SVM) is incorporated to the images. It is shown that the above procedure segments the pallets successfully without degradation of resolution.

关键词： Image segmentation Wavelet transforms Image resolution Degradation Support vector machines Support vector machine classification Digital images Object detection Metals industry Rails

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Online signature verification using combination of two classifiers

Online signature verification using combination of two class...

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Iranian Machine Vision and Image processing (MVIP)

作者： M. Saeidi R. Amirfattahi A. Amini M. Sajadi Digital Signal processing Research Laboratory Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran

The objective of signature verification is to distinguish forgery signature from genuine one. Online signature is the one which is registered through electronic devices such as digitizers and stored on computers in time sequence form. In this kind of signatures in addition to location information, time information such as speed and acceleration is stored. In this paper after accomplishment of some pre-processing procedures like normalization of signature size, smoothing and elimination of rotation on signatures using algorithms based on extremum matching of signals and ant colony, their time duration will be equalized. Afterwards, similarities between signatures will be determined using extended regression and finally will try to distinguish between forgery signatures from genuine one using support vector machine (SVM). The suggested online verification system is tested on SVC2004 signature set which is related to the first international signature verification competition and results are compared to respective results of participants. The results state that suggested method exhibits equal error rate (EER) of %4.3 in skilled forger group.

关键词： Forgery Mathematical model Equations Support vector machines Training Error analysis

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Adapting a MIMO/phased-array radar transmit beampattern to target location

Adapting a MIMO/phased-array radar transmit beampattern to t...

引用

International Workshop on Cognitive Information processing

作者： Fuhrmann, Daniel R. Browning, J. Paul Rangaswamy, Muralidhar Department of Electrical and Computer Engineering Michigan Technological University Houghton MI 49931 United States U.S. Air Force Research Laboratory Sensors Directorate Radar Signal Processing Branch Wright-Patterson AFB OH United States

ISBN: (纸本)9781424464593

Proposed MIMO and hybrid MIMO/phased array (HMPAR) radar systems have the potential for tremendous flexibility in the choice of the transmit beampattern, through the selection of multiple transmitted signals. This paper considers how one might exploit that flexibility in light of prior information or uncertainty in target spatial location, for parameter estimation or tracking applications. We first consider an idealized problem of distributing energy across multiple target sites given a prior probability distribution on those sites. It shown that the optimal allocation of energy would be proportional to the square root of the prior probability. Second, we propose a method to approximate this optimal distribution of energy using a MIMO radar or HMPAR radar system. The method chooses signals that realize an intrapulse beamscan over the region of interest, with a nonuniform distribution of scan points matched to the desired distribution of energy. © 2010 IEEE.

关键词： MIMO radar

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Image encryption using the reciprocal-orthogonal parametric transform

Image encryption using the reciprocal-orthogonal parametric ...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Saad Bouguezel M. Omair Ahmad M. N. S. Swamy Scientific Instrumentation Laboratory Department of Electronics Faculty of Engineering University Farhat Abbas of Setif Setif Algeria Center of Signal processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal Canada

Discrete transforms have been widely used in various signal processing applications. Specifically, transform-based data encryption techniques have become attractive for many recent communication systems. In this paper, we propose a fast and efficient image encryption method based on the reciprocal-orthogonal parametric (ROP) transform. By exploiting the properties of the ROP transform, we show that its independent parameters can successfully be used as an additional secret key for encryption. Experiments results carried clearly show the efficiency of the proposed encryption method.

关键词： Cryptography Discrete transforms signal processing Watermarking Instruments Laboratories Image coding Application software Matrix decomposition Software algorithms

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Relay-assisted MIMO transmission with three-phase scheduling in cognitive radio networks

Relay-assisted MIMO transmission with three-phase scheduling...

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International Conference on Wireless Internet

作者： Sen Shao Qingmin Meng Wenhui Zong Wei-ping Zhu Institute of Signal and Transmission Nanjing University of Posts and Telecommunications Nanjing China Center of Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, we investigate a joint scheduling and transmitting scheme in cognitive radio networks. Three phases are considered in the proposed scheme(named scheme 1): l)in the first phase, JVt primary users(PUs) in the high-rate region are chosen to implement communication with primary base station (PBS); 2)in the second phase, PBS will support simultaneously the fixed relay station(RS) and the selected PUs in the high-rate region based on certain beamforming(BF); 3)in the third phase, selected PUs in the low-rate region and selected cognitive users(CUs) in the cognitive region are supported by RS. In particular, during the phases above, all selected users send back their channel covariance matrices to PBS or RS on the purpose of lowering the feedback and implementing certain BE Furthermore, a frame structure used for the joint scheduling and transmitting scheme is presented and the performance of scheme 1 with imperfect channel covariance matrix feedback is evaluated to compare with that of scheme 1 with perfect feedback. From the simulation results, the proposed scheme(scheme 1) can significantly improve the throughput of the network over the basic system(named scheme 2) without spectral sharing.

关键词： Relays MIMO Cognitive radio Silicon compounds

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Fusion of visible and synthesised near infrared information for face authentication

Fusion of visible and synthesised near infrared information ...

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IEEE International Conference on Image processing

作者： Seyed Mohammad Mavadati Mohammad Taghi Sadeghi Josef Kittler Signal Processing Research Laboratory Department of Electrical & Computer Engineering Yazd University Iran CVSSP University of Surrey Guildford Surrey UK

Changes in illumination conditions can cause drastic variations in face appearance and affect the performance of a face authentication system. Near infrared (NIR) face imaging systems have been proposed as a promising way towards illumination invariant face verification. We show that when NIR face images cannot be observed, learning the relationship between NIR information and the corresponding visible images can provide useful complementary information about visible light image data. In particular, we use Canonical Correlation Analysis (CCA) to synthesise the NIR eigenfaces from their corresponding visible ones. In this paper, the verification performance of a CCA-based synthesising algorithm is developed first. Although, synthesised NIR images do not perform as well as the real NIR, it is shown that by fusing the visible and synthesised near infrared information at the score level, the performance of the authentication system considerably improves.

关键词： Face Lighting Correlation Support vector machines Authentication Databases Linear regression

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