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检索条件"任意字段=4th Conference on Mathematics of Image and Data Coding, Compression, and Encryption"

共 249 条记录，以下是161-170 订阅

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Application of Fuzzy Neural Network Predictor to Mosaic image coding

Application of Fuzzy Neural Network Predictor to Mosaic Imag...

引用

4th International conference on Natural Computation (ICNC 2008)

作者： Cheng, Yongqiang Hu, Min Xie, Keming Taiyuan Univ Technol Coll Informat Engn Taiyuan Peoples R China

ISBN: (纸本)9780769533049

In this paper,. we propose an effective sequential lossless compression scheme which performs sequentially pixel by pixel in raster-scan order, also so called one-pass scheme as opposed to multiple-pass scheme. the proposed method has two major components: fuzzy neural network predictor and context based adaptive arithmetic coder. the proposed predictor which is based on T-S fuzzy neural network system effectively exploits structural redundancies between mosaic-like color components, and its residuals are well-modeled by a two-side geometry distribution centered at zero. An advantage of the proposed compression method is the clean separation between prediction and entropy coding of prediction errors. Any entropy coder, be it Huffman or arithmetic, static or adaptive, binary or m-ary, can be easily interfaced with our predictor. Consequently, we can encode mosaic images at low complexity level. Compared with existing methods of lossless compression for Bayer raw data, the performance of proposed method is apparently the best.

关键词： Pixels

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SAR polar format implementation with MATLAB

SAR polar format implementation with MATLAB

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IEEE/IFIP International conference in Central Asia on Internet (ICI)

作者： Navneet Agrawal K. Venugopalan Department of Electronics & Communication Engineering College of Technology & Engineering MPUAT Udaipur Rajasthan India Department of Computer Sc.& Information Tehnology University College of Science ML Sukhadia University Udaipur Rajasthan India

ISBN: (纸本)9781424422821

Transform coding based on the Karhunen-Loeve transform (KLT), the discrete cosine transform (DCT), and the discrete wavelet transform (DWT) is well-understood for optical images. Transform coding applied to synthetic aperture radar (SAR) data, however, has not been well-studied. this paper compares the results of compressing SAR images when it is available in Cartesian and polar formats. We compare the compression results based on six performance criteria-mean-squared error, mean absolute error, peak signal-to-noise ratio, energy compaction, transform gain, and compression *** both the formats the phase information of the compressed data is preserved to a great extent. A block adaptive Max quantizer is used with 1-5 bit quantization of the components. the quality of the reconstructed data is compared in terms of compression ratio and quality parameters: signal to noise ratio (SNR), standard deviation of the phase (PSD), and mean phase error (MPE). the parameters are calculated for SAR raw data, complex data and 8-bit gray scale image. Finally, original(Fig.4) and reconstructed gray scale images(Fig. 5) are presented.

关键词： Quantization Signal to noise ratio image coding data compression Histograms image reconstruction Azimuth

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Interactive TV on parliament session

Interactive TV on parliament session

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conference on mathematics of data/image Pattern Recongnition, compression, coding, and encryption X, with Applications

作者： Royer, J. Nguyen, H. Martinot, O. Preda, M. Preteux, F. Zaharia, T. Alcatel Lucent Villarceaux France ARTEMIS Dept GET INT Evry France

ISBN: (纸本)9780819468482

this paper introduces a new interactive mobile TV application related to parliament session. this application aims to provide additional information to mobile TV users by inserting automatically and in real-time interactive contents (complementary information, subject of the current session...) into original TV program, using MPEG-4 streaming video and extra real time information (news, events, databases... from RSS streams, Internet links...). Here, we propose an architecture based on plug-in multimedia analyzers to generate the contextual description of the media and on an interactive scene generator to dynamically create related interactive scenes. Description is implemented according to the MPEG-7 standard.

关键词： multimedia analyzer interactive scene metadata interactive services MPEG-4 BIFS MPEG-7

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Compressed vs. uncompressed domain video watermarking

Compressed <i>vs</i>. uncompressed domain video watermarking

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conference on mathematics of data/image Pattern Recongnition, compression, coding, and encryption X, with Applications

作者： Duta, S. Mitrea, M. Preteux, F. GET INT ARTEMIS Dept Evry France

ISBN: (纸本)9780819468482

When considering the multimedia production chain from the content creation to the end-user consumption, watermarking provides a well defined functionality: property right identification and copy-maker tracking. However, its place within this chain is not yet clearly stated. the present paper describes an objective study aiming at establishing the functional peculiarities in the cases when watermarking follows compression. First, some general limits concerning the transparency, robustness and capacity in compressed (WEG-4 AVC) domain watermarking are identified. then, these results are discussed and compared to the uncompressed domain watermarking case. the experiments were carried out on a video corpus of 5 video sequences, each of them of 35000 frames (about 25 minutes each), coded at 256kbit/s.

关键词： MPEG-4 AVC video watermarking transparency robustness capacity

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Wyner-Ziv video coding with part intracoding

Wyner-Ziv video coding with part intracoding

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4th International conference on image and Graphics

作者： Ding, Guiguang Tsinghua Univ Sch Software Beijing 100084 Peoples R China

ISBN: (纸本)9780769529295

In Wyner Ziv video coding, efficient compression is achieved by exploiting source statistics at the decoder only, which is radically different front conventional video coding. Prior works on this topic generally use channel coding to implement Slepian-Wolf codec. However, the correlation between some bitplanes of source and that of side information may be very weak. At that time, the coding performance of Slepian- Wolf codec should be lower than that of intracoding codec. If we can divide the video data into strongly cot-relative data encoded by Slepian-Wolf codec and weakly correlative data encoded by Intracoding codec, the coding performance of video codec would be improved In this paper, we proposed a novel distributed video coding scheme with part Intracoding. Simulation results show that the proposed scheme can achieve better compression efficiency while keeping the simple encoding property.

关键词： image coding

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High capacity data embedding using colour palette decomposition

High capacity data embedding using colour palette decomposit...

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4th IASTED International conference on Signal Processing, Pattern Recognition and Applications

作者： Raja, K. B. Siddaraju, S. Venugopal, K. R. Patnaik, L. M. Bangalore Univ Univ Visvesvaraya Coll Engn Dept Comp Sci Engn Bangalore 560056 Karnataka India Indian Inst Sci Microprocessor Appl Lab Bangalore Karnataka India

ISBN: (纸本)9780889866461

Steganography is the embedding of secret message in the cover image for covert communication. In this paper, we present a High Capacity data Embedding using Colour Palette Decomposition (CPD) in which the payload is embedded into the cover image as an index of shifted centroids to derive the stego image. the error control coding is applied to stego image to increase PSNR, capacity and security. It is observed that our algorithm has higher PSNR and capacity in comparison to earlier works.

关键词： steganography colour palette payload encryption error control code

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Comparison of pyramidal and packet wavelet coder for image compression using cellular neural network (CNN) with thresholding and quantization

Comparison of pyramidal and packet wavelet coder for image c...

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4th International conference on Information Technology - New Generations

作者： Rahul, S. Vignesh, J. Santosh, Kumar S. Bharadwaj, M. Venkateswaran, N. Final Year Undergraduate Students Sri Venkateswara College of Engineering India

ISBN: (纸本)9780769527765

We present the packet wavelet coder implemented with Cellular Neural Network architecture, and show its superiority over the pyramidal wavelet representation. this paper also demonstrates how the cellular neural universal machine (CNNUM) architecture can be extended to image compression. the packet wavelet coder performs the operation of image compression, aided by CNN architecture. It uses the highly parallel nature of the CNN structure and its speed outperforms traditional digital computers. In packet wavelet coder, an image signal can be analyzed bypassing it through an analysis filter banks followed by a decimation process, according to the rules of packet wavelets. the Simulation results indicate that the quality of the reconstructed image is superior by using packet wavelet coding scheme. Finally, a quantization operation is performed in order to translate the coefficient values to discrete environment. Our results are compared with that of pyramidal wavelet representation.

关键词： image compression data compression wavelets ENCODER Packet Quantization Filter banks image signal Cellular neural networks

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A fast and accurate moving object extraction scheme in the MPEG compressed domain

A fast and accurate moving object extraction scheme in the M...

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4th International conference on image and Graphics

作者： Zhou Qiya Yang Gaobo Chen Weiwei Zhang Zhaoyang Hunan Univ Sch Comp & Commun Changsha 410082 Hunan Peoples R China Shanghai Univ Minist Educ Key Lab Adv Display & Syst Applicat Shanghai 200072 Peoples R China

ISBN: (纸本)9780769529295

the hot topic of moving object extraction has been transferred from the pixel domain to directly from the compressed stream. the existed work of compressed-domain moving object extraction in the literature usually can meet the requirement of real-time performance. However, the accuracy of extracted objects is too coarse. the reason is that the information utilized in the compressed-domain extraction process is not abundant and noisy. In order to solve this problem, a novel moving object extraction scheme with high accuracy for MPEG stream is proposed. Firstly, the contour-feature and motion vector based projection are fused to extract the coarse object in an efficient way. Second, the blocks in I frame are partially decoded to improve the segmentation accuracy. the innovation lies in a threshold method of image segmentation with automatic seeding is applied on the DC+2AC image of I frame to extract the contour-feature, which is combined with the projection of motion vector field of P frame to complete the coarse segmentation. then tradeoff is made between the executive time and results' accuracy. High accuracy is acquired at the cost of partially decoding time and region-growing processing time, which is worthwhile at the expense of such a little more time to refine the result. Experiments reveal that the proposed algorithm has the attributes of both real-time and high accuracy at the same time.

关键词： Transform coding data mining Pixel image segmentation Video compression image coding Decoding Computer displays Streaming media Costs

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PCR-tree: a compression-based index structure for similarity searching in high-dimensional image databases

PCR-tree: a compression-based index structure for similarity...

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4th International conference on Fuzzy Systems and Knowledge Discovery

作者： Cui, Jiangtao Zhou, Shuisheng Zhao, Shan Xidian Univ Dept Comp Sci & Technol Xian Peoples R China Xidian Univ Sch Sci Xian 710071 Peoples R China

ISBN: (纸本)0769528740

the vector approximation file (VA-file) approach is an efficient high-dimensional indexing method using compression technique to overcome the difficulty of 'curse of dimensionality'. the VA-file method combined with tree-based index structure can improve the querying efficiency, but it still succumbs to the 'curse of dimensionality'. In this paper, a new high-dimensional indexing structure called PCR-tree for non-uniform distributed data sets was presented, which employs R-tree to manage the approximate vectors in the reduced-dimensionality space. the approximate vectors can be built in the K-L transform domain, and low dimensional MBRs (minimum bounding rectangles) can be used to manage the approximations on the first few principal components. When performing k -nearest neighbor search, a lower-bound filtering algorithm is used to reject the improper nodes of PCR-tree, which can reduce the computational complexity and I/O cost without any dismissals. the experiment results on large image databases show that the new approach provides a faster search speed than other tree-structured vector approximation approaches.

关键词： image coding Indexes image databases Indexing Karhunen-Loeve transforms Computer science Filtering algorithms Computational complexity Costs Acceleration

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data hiding on H.264/AVC compressed video

引用

4th International conference on image Analysis and Recognition, ICIAR 2007

作者： Sung, Min Kim Sang, Beom Kim Youpyo, Hong Chee, Sun Won Dept. of Electronic Eng. MMChips Co. Ltd. Seoul 100-715 Korea Republic of

ISBN: (纸本)9783540742586

An important issue in embedding watermark bits in compressed video stream is to keep the bit-rate unchanged after the watermarking. this is a very difficult problem for high efficient compression methods such as H.264/AVC, because just one bit alteration in highly compressed bit-stream may widely affect the video content. In this paper we solve this problem by embedding watermark bit to the sign bit of the Trailing Ones in Context Adaptive Variable Length coding (CAVLC) of H.264/AVC. the algorithm yields no bit-rate change after the data hiding. Also, we can easily balance between the capacity of the watermark bits and the fidelity of the video. the simplicity of the proposed algorithm is an added bonus for the real-time applications. Our experiments show that the PSNRs of the video sequences after the data hiding are higher than 43dB. © Springer-Verlag Berlin Heidelberg 2007.

关键词： image segmentation

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