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New panoramic image generation based on modeling of vignetting and illumination effects

6th Pacific Rim Conference on Multimedia - Advances in Mulitmedia Information processing - PCM 2005

作者： Sim, Dong-Gyu Image Processing Systems Laboratory Dept. of Computer Engineering Kwangwoon University 447-1 Wolgye-dong Nowon-gu Seoul 139-701 Korea Republic of

ISBN: (纸本)3540300279

In this paper, a new panoramic image generation algorithm is proposed based on more realistic image formation processes. Perspective projection, lens distortion, vignetting and illumination effects are incorporated into the proposed panoramic modeling. Intrinsic and extrinsic camera parameters are estimated by the proposed stable camera parameter estimation algorithm derived from panning camera constraints. This paper shows that accurate panoramic images can be reconstructed based on the proposed camera modeling and parameters estimation. The effectiveness of the proposed algorithm is also shown with several image sequences in terms of reconstruction error from the generated panoramic image. © Springer-Verlag Berlin Heidelberg 2005.

关键词： image processing

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Transmission distortion modeling for wireless video communication

Transmission distortion modeling for wireless video communic...

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GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Dani, Janak U. Zhihai, He Hongkai, Xiong Dept. of Electrical and Computer Engineering University of Missouri Columbia MO 65211 Institute of Image Communication and Information Processing Shanghai Jiaotong University Shanghai 200030 China

ISBN: (纸本)0780394143

In video transmission over wireless networks, the channel is error-prone and the compressed video data is highly sensitive to errors. The transmission errors will cause decoding failure and distort the pictures. This type of picture distortion is called transmission distortion. In this work, we develop a predictive approach for transmission modeling so that the encoder is able to estimate the average transmission distortion of the decoded video data. Our simulation results demonstrate that the proposed model is robust and accurate. Using this type of predictive transmission distortion model, the encoder is able to intelligently allocate its resources, such as bits and energy, to maximize the decoded video quality at receiver side.

关键词： Wireless telecommunication systems

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Modified color co-occurrence matrix for image retrieval

Modified color co-occurrence matrix for image retrieval

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First International Conference on Natural Computation, ICNC 2005

作者： Chang, Min Hyuk Pyun, Jae Young Ahmad, Muhammad Bilal Chun, Jong Hoon Park, Jong An Dept. of Information and Communications Engineering Chosun University Gwangju Korea Republic of Signal and Image Processing Lab. Dept. of Mechatronics Gwangju Institute of Science and Technology Gwangju Korea Republic of Dept. of Computer Information and Communication Eng. Jeonnam Provincial Collage Jeonnam Korea Republic of

Color correlogram for content-based image retrieval (CBIR) characterizes not only the color distribution of pixels, but also the spatial correlation of pairs of colors. Color not only reflects the material of surface, but also varies considerably with the change of illumination, the orientation of the surface, and the viewing geometry of the camera. The invariance to these environmental factors is not considered in most of the color features in color based CBIR including the color correlogram. However, pixels changed their color with almost same proportions with change of environmental factors. This fact is taken into consideration, and new algorithm is proposed. The color cooccurrence matrix for different spatial distances is defined based on the maximum/minimum of color component between the three components (R,G,B) of a pixel. The proposed algorithm has less number of features, and the change of illumination, etc. is also taken into account. © Springer-Verlag Berlin Heidelberg 2005.

关键词： image retrieval

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MoSS: A program for molecular substructure mining

MoSS: A program for molecular substructure mining

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1st International Workshop on Open Source Data Mining: Frequent Pattern Mining Implementations, OSDM 2005, held in conjunction with the 11th ACM SIGKDD International Conference on knowledge Discovery and Data Mining

作者： Borgelt, Christian Meinl, Thorsten Berthold, Michael Dept. of Knowledge Processing and Language Engineering University of Magdeburg Universitätsplatz 2 39106 Magdeburg Germany Computer Science Department 2 University of Erlangen-Nuremberg Martenstraße 3 91058 Erlangen Germany Dept. of Computer and Information Science University of Konstanz 78457 Konstanz Germany

ISBN: (纸本)1595932100

Molecular substructure mining is currently an intensively studied research area. In this paper we present an implementation of an algorithm for finding frequent substructures in a set of molecules, which may also be used to find substructures that discriminate well between a focus and a complement group. In addition to the basic algorithm, we discuss advanced pruning techniques, demonstrating their effectiveness with experiments on two publicly available molecular data sets, and briefly mention some other extensions. Copyright 2005 ACM.

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Study on the detection of infrared small dim targets based on DMMFs

Study on the detection of infrared small dim targets based o...

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International Conference on Space Information Technology

作者： Li, Tao Zhang, Jian Zhang, Caifang Xie, Yubo Key Laboratory of Education Huazhong University of Science and Technology Ministry for Image Processing and Intelligent Control 430074Hubei China School of Information and Electrical Engineering Hunan University of Science and Technology Xiangtan Hunan 411201 China Dept. of Electronic and Information Engineering Huazhong University of Science and Technology Wuhan 430074Hubei China

ISBN: (纸本)0819460079

This paper presents an effective method to detect small and dim infrared image target under complex background, which is performed in spatial domain. Roughly speaking, the new method contains two steps. The first step is further divided into two steps (called difference between maximum and minimum filters, DMMFs): firstly, an original image is filtered by maximum (max) and minimum (min) filters based on the considering max filter can enhance the target and preserve the background while min filter can eliminate the target and also preserve the background;and then the difference between these two results is obtained, therefore the target is enhanced and its background is suppressed at the same time. To obtain an accurate location of the target, the second step called post processing involves local feature mapping and projecting techniques. This DMMF method focuses on reducing the cost of computation, tracking the target in real-time, enhancing the SNR, and suppressing its background clutter. The simulation results show that the proposed algorithm is effective and practical.

关键词： Infrared imaging

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Hybrid model sprite generation: A high-quality, fast and robust algorithm

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International Journal of Electrical engineering 2005年第3期12卷 215-223页

作者： Chi, Cheng-Jan Chen, Chin-Hsing Yang, Dyi-Lang Image Processing Lab. EE Department National Cheng Kung Univ. Taiwan Taiwan ASUS Corp. Electrical Engineering Dept. National Cheng Kung University Department of Electronic Engineering Kaohsiung Municipal Kaohsiung Industrial High School Taiwan Taiwan Office of Academic Affairs Department of Electronic Communication Engineering National Kaohsiung Marine University Taiwan Taiwan

Sprite generation, the core of the sprite coding, is a developing technique included in the MPEG-4 standard. It achieves high subjective quality with low bitrates. The affine and perspective GME (Global Motion Estimation) methods are demonstrated in the MPEG-4 Verification Model (MPEG-4 VM), MPEG-4 Optimization Model (MPEG-4 OM) and many other algorithms. The affine model GME, provides limited image quality, is robust and fast. The perspective model GME generates sprites with better quality, however it suffers from the time-wasting and error propagation problem. A new method to generate sprites in this paper combines the existing affine and perspective GME algorithms to produce high sprites quickly without losing robustness. In order to generate high quality sprites, the proposed "Hybrid Model GME" method uses the affine model GME as an initial search, then switches to the perspective model GME if necessary. To accelerate the speed, a nearest neighborhood (NN) kernel is used to replace the bilinear method for image warping. Experimental results show that the image quality is much improved even when camera movements are more complex and quick. The computation speed is between 10 and 17 times faster than the MPEG-4 VM. If the sprites can be divided into several pieces, the computation speed can be about 1.46 times faster ahead.

关键词： Algorithms

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Weight and stopping set distributions of two-edge type LDPC code ensembles

Weight and stopping set distributions of two-edge type LDPC ...

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作者： Ikegaya, Ryoji Kasai, Kenta Shimoyama, Yuji Shibuya, Tomoharu Sakaniwa, Kohichi Dept. of Communications and Integrated Systems Tokyo Institute of Technology Tokyo 152-8552 Japan R and D Department National Institute of Multimedia Education Chiba-shi 261-0014 Japan Department of Communications and Integrated Systems Graduate School of Science and Engineering Tokyo Institute of Technology Japan R and D Department National Institute of Multimedia Education Japan IEEE SITA IPSJ Japan Information Processing Society Japan Institute of Image Information and Television Engineers Japan Society of Information Theory and its Applications Japan

In this paper, we explicitly formulate the average weight and the stopping set distributions and their asymptotic exponents of two-edge type LDPC code ensembles. We also show some characteristics such as the symmetry and the conditions for zero of the weight distributions of two code ensembles. Further we investigate the relation between two code ensembles from the perspectives of the weight and stopping set distributions. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers.

关键词： Codes (symbols)

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A joint source coding-power control approach combined with adaptive channel coding for video transmission over CDMA cellular networks

A joint source coding-power control approach combined with a...

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2003 IEEE 58th Vehicular Technology Conference, VTC2003-Fall

作者： Chan, Yee Sin Modestino, James W. Center for Image Processing Research ECSE Dept. Rensselaer Polytechnic Institute Troy NY 12180 Department of Electrical Engineering University of Miami Coral Gables FL 33124

ISBN: (纸本)0780379543

We consider a cross-layer design approach for CDMA mobile wireless networks supporting heterogeneous compressed video. By considering the resource requirements as the aggregate of the products of source coding rates and the energy per information bit to noise ratio, we propose a cross-layer optimization approach for video delivery over CDMA cellular networks. In particular, we describe a joint source coding-power control (JSCPC) strategy used in conjunction with joint source-channel coding (JSCC) and employing the class of rate-compatible punctured convolutional (RCPC) codes to provide forward error correction (FEC) coding. We show that this cross-layer approach can simultaneously maximize the quality of the delivered video while minimizing the total resource consumption, thereby providing higher spectral efficiency and improved network utilization. We demonstrate the efficacy of this approach using the ITU-T H.263+ video coder.

关键词： Code division multiple access

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Optical scanning cryptography

Optical scanning cryptography

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Wave-Optical Systems engineering II

作者： Poon, Ting-Chung Optical Image Processing Laboratory Bradley Dept. of Elec. Engineering Virginia Polytech. Inst./Stt. Univ. Blacksburg VA 24061

We introduce a technique called optical scanning cryptography (OSC). The technique can perform encryption on-the-fly using laser beams and can be implemented using an optical heterodyne scanning. We shall first describe the optical heterodyne scanning system and then provide some computer simulations to clarify and confirm the idea of encryption and decryption.

关键词： Cryptography

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Vehicle tracking using image processing techniques

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4th International Conference on Rough Sets and Current Trends in Computing, RSCTC 2004

作者： Rhee, Seung Hak Han, Seungjo Kim, Pan koo Ahmad, Muhammad Bilal Park, Jong An College of Electronics and Information Engineering Chosun University Gwangju Korea Republic of Signal and Image Processing Lab Dept. of Mechatronics Kwangju Institute of Science and Technology Gwangju Korea Republic of

ISBN: (纸本)3540221174

A real time vehicle tracking in image sequences is presented. The moving vehicles are segmented by the method of differential image followed by the process of morphological dilation. The vehicles are recognized and tracked using statistical moments. The straight lines in the moving vehicles are found with the help of Radon transform. The direction of the moving object is calculated from the orientation of the straight lines in the direction of the principal axes of the moving objects. The direction of the moving object and the displacement of the object in the image sequence are used to calculate the velocity of the moving objects. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Vehicles

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