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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131-140 订阅

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Analysis of video compression algorithms on different video files

Analysis of video compression algorithms on different video ...

引用

4th International conference on Computational Intelligence and Communication Networks, CICN 2012

作者： Mozammil Zakariya, S.M. Inamullah, M. Department of Computer Engineering AMU Aligarh India

ISBN: (纸本)9781467329811

the digital video application has become increasingly popular in mobile terminals such as cellular phones and personal digital assistance. However, due to its inherent data intensity of video sequences, storing and transmitting raw video data become impractical. With the limited storage and bandwidth capacity, this data must be compressed to a transportable size and finally decompressed to reach the destination. For this purpose, we studied and implemented two well known video compression and decompression algorithms i.e. Run Length Encoding (RLE) and Arithmetic coding (AC). the main advantage of these compression techniques is that it almost compresses and decompresses all types of video files. In this work, we computed the compression rate on different video files by applying both algorithms. Experimentally, we find that AC algorithm compressed better in almost all types of video files except DAT type video file, and we also find that the compression rate of DAT file is highest and RLE performed better in it. © 2012 IEEE.

关键词： image compression

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VLSI design of a DWT/modified efficient SPIHT based image codec 4

VLSI design of a DWT/modified efficient SPIHT based image co...

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Joint conference of the 4th International conference on Information, Communications and Signal Processing and 4th Pacific-Rim conference on Multimedia, ICICS-PCM 2003

作者： Huang, Win-Bin Chang, Yuan-Jui Su, Alvin W.Y. Kuo, Yau-Hwang Dept. of Computer Science and Information Engineering National Cheng-Kung University Taiwan China

ISBN: (纸本)0780381858

Set Partitioning in Hierarchical Trees (SPIHT) is a highly efficient technique for compressing Discrete Wavelet Transform (DWT) decomposed images. though its compression efficiency is a little less than famous Embedded Block coding with Optimized Truncation (EBCOT) adopted by JPEG2000, a codec standard for still images, SPIHT has a straightforward coding procedure and requires no tables. these make SPIHT a more appropriate algorithm for hardware implementation. In this paper, a modified SPIHT algorithm is presented. the modifications include a simplification of coefficient scanning process, a 1-D addressing method instead of the original 2-D arrangement for wavelet coefficients and a fixed memory allocation for the data lists instead of a dynamic allocation required in the original SPIHT. though distortion is slightly increased, it enjoys an extremely fast throughput and easier hardware implementation. the gate counts of a 16-by-16 DWT/IDWT and a modified SPIHT/Inv-SPIHT are 12,458 and 5,758 respectively. A complete image codec is also provided. © 2003 IEEE.

关键词： Discrete wavelet transforms

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Construction of shift-orthogonal wavelets using splines

Construction of shift-orthogonal wavelets using splines

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4th conference on Wavelet Applications in Signal and image Processing

作者： Unser, M thevenaz, P Aldroubi, A NIH BIOMED ENGN & INSTRUMENTAT PROGRAMNATL CTR RES RESOURCESBETHESDAMD 20892

ISBN: (纸本)0819422134

We present examples of a new type of wavelet basis functions that are orthogonal across shifts, but not across scales. the analysis functions are low order splines while the synthesis functions are polynomial splines of higher degree n₂. the approximation power of these representations is essentially as good as that of the corresponding Battle- Lemarie orthogonal wavelet transform, with the difference that the present wavelet synthesis filters have a much faster decay. this last property, together with the fact that these transformation s are almost orthogonal, may be useful for image coding and data compression.

关键词： splines wavelet basis biorthogonal wavelets perfect reconstruction filterbanks approximation properties image coding

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Format-compliant entropy coding encryption algorithms for wireless video system

Format-compliant entropy coding encryption algorithms for wi...

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2008 International conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008

作者： Li-Feng, Wang Jian, Ma Wen-Dong, Wang Kong-Qiao, Wang Chen, Xiao State Key Lab. of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Department of Electronic and Information Engineering Beijing Electronic Science and Technology Institute Beijing China Nokia Research Center Beijing China School of Computer Science and Technology Bei Hang University Beijing China

ISBN: (纸本)9781424421084

Wireless video security becomes an important challenge for commercial applications. Two efficient encryption algorithms for video system, Signed Integer Exponential-Golomb Coded (SE) encryption Algorithm and Context-Adaptive Variable Length coding (CAVLC) encryption Algorithm are proposed during the process of the entropy coding. In order to maintain the format compliance, the signs of motion vector difference (MVD), delta quantity parameter (QP) in SE are confused, as well as the levels of nonzero transform coefficients in CAVLC are encrypted by stream cipher. Experimental results demonstrate that the proposed algorithms that encrypt much less important data can achieve high security and low complexity, while still maintain compliance to the compression format. the proposed algorithms are especially suitable for wireless multimedia application. © 2008 IEEE.

关键词： Codes (symbols)

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Analysis of Audio Steganography combined with Cryptography for RC4 and 3DES encryption 4

Analysis of Audio Steganography combined with Cryptography f...

引用

4th International conference on Inventive Systems and Control, ICISC 2020

作者： Rashmi, N. Nmam Institute of Technology Dept. of Ise Nitte Karnataka India India

ISBN: (纸本)9781728128139

In this digital era, most of the real-time applications makes use of digital data. At the same time, security of this data becomes important and essential. Different aspects to be considered while dealing with such digital data. they are preserving authenticity and make sure that the data is not modified in transit and no one else other than intended user can read this data. To fulfil these requirements, many techniques are available to protect this data. Cryptography is to jumble the original information so that unauthorized person can't see it and that of steganography is to hide the original information. Depending on the cover medium used, steganography has many types such as image, audio, and video. Audio steganography deals with the noise, echo, samples etc present in the audio. LSB, Echo hiding, phase coding, Tone insertion are some of the types of audio steganography techniques. these techniques have their respective pros and cons. the main intention of the presented technique is to reconciliate cryptography with steganography and give better protection. © 2020 IEEE.

关键词： Cryptography

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Analysis of Audio Steganography combined with Cryptography for RC4 and 3DES encryption 4

Analysis of Audio Steganography combined with Cryptography f...

引用

4th International conference on Inventive Systems and Control, ICISC 2020

作者： Ms Rashmi, N. Nmam Institute of Technology Dept. of Ise Nitte Karnataka India

ISBN: (纸本)9781728128139

As most of the real time applications make use of digital data, security of the data resources become more important and essential. Different aspects to be considered while dealing with such digital data are preserving authenticity and make sure that the data is not modified in transit and no one else other than intended user can read this data. To fulfil these requirements, many techniques are available to protect this data. Cryptography is to jumble the original information so that it cannot be viewed by any unauthorized users and steganography is used to hide the original information. Depending on the cover medium used, steganography has many types such as image, audio, and video. Audio steganography deals with the noise, echo, samples etc present in the audio. LSB, Echo hiding, Phase coding, Tone insertion are some of the types of audio steganography techniques. these techniques have their respective pros and cons. the main intention of the presented technique is to re-conciliate cryptography with steganography and deploys a better protection. © 2020 IEEE.

关键词： Cryptography

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Novel image compression and Deblocking Approach Using BPN and Deep Neural Network Architecture 4th

Novel Image Compression and Deblocking Approach Using BPN an...

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4th IFIP TC 12 International conference on Intelligence Science, ICIS 2020

作者： Manyam, Rajsekhar Reddy Sivagami, R. Krishankumar, R. Sangeetha, V. Ravichandran, K.S. Kar, Samarjit School of Computing SASTRA University ThanjavurTN613401 India Department of Mathematics NIT Durgapur Durgapur West Bengal India

ISBN: (纸本)9783030748258

Medical imaging is an important source of digital information to diagnose the illness of a patient. the digital information generated consists of different modalities that occupy more disk space, and the distribution of the data occupies more bandwidth. A digital image compression technique that can reduce an image's size without losing much of its important information is challenging. In this paper, a novel image compression technique based on BPN and Arithmetic coders is proposed. the high non-linearity and unpredictiveness of the interrelationship between the pixels present in the image to be compressed is handled by BPN. An efficient coding technique called Arithmetic coding is used to produce an image with a better compression ratio and lower redundancy. A deep CNN based image deblocker is used as a post-processing step to remove the artefacts present in the reconstructed image to improve the quality of the reconstructed image. the effectiveness of the proposed methodology is validated in terms of PSNR. the proposed method is able to achieve about a 3% improvement in PSNR compared with the existing methods. © 2021, IFIP International Federation for Information Processing.

关键词： Magnetic resonance imaging

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Wavelet image coding based on significance extraction using morphological operation 5

Wavelet image coding based on significance extraction using ...

引用

5th Asia-Pacific conference Communications and 4th Optoloelectronics Communications conference, APCC/OECC 1999

作者： Zhong, J.M. Leung, C.H. Tang, Y.Y. Dept. of Electrical and Electronic Engineering University of Hong Kong Pokfulam Road Hong Kong Hong Kong Dept. of Computing Studies Hong Kong Baptist University Kowloon Tong Hong Kong

In this paper, an efficient embedded image compression algorithm is presented. It is based on the observation that the distribution of significant coefficients is intra-subband clustered and inter-subband self-similar. Morphological dilation is used to capture the clustered significant coefficients in each subband, resulting in the partitioning of each subband into significance clusters and insignificance space. thus for entropy coding, different probability models are used for different regions according to their own probability distributions. When encoding the insignificant space, which contains mostly zeros, investigation reveals that the zerotree data structure is not very efficient to represent zeros across scales for texture images and a more efficient method is presented. Experimental results show that the proposed algorithm is very effective especially for texture images. © 1999 China Inst. Of Communications.

关键词： Probability distributions

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MOBIMEDIA 2008 - 4th International ICST Mobile Multimedia Communications conference

MOBIMEDIA 2008 - 4th International ICST Mobile Multimedia Co...

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4th International ICST Mobile Multimedia Communications conference, MOBIMEDIA 2008

ISBN: (纸本)9789639799257

the proceedings contain 34 papers. the topics discussed include: parameters optimization for a scalable multiple description coding scheme based on spatial subsampling*;error control for video streaming with small data units;context for multimedia services adaptation;an hybrid error concealment method with data hiding for H.264 over wireless network;reversible image hiding using shifting of mean values with interlaced grouping and side grouping;quality adapted fractal image compression for multimedia communication;ID-based signature scheme for mobile payment;a comparison of request and measurement based end to end video target rate adaptation methods;experimental evaluation of multimedia services in WiMAX;scenarios and research issues for a network of information;and quality-based technique for routing and playout buffering in IP telephony over mobile ad hoc network.

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Research on the WebP image Format 4th

Research on the WebP Image Format

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4th China Academic conference on Printing and Packaging (CACPP)

作者： Si, Zhanjun Shen, Ke Tianjin Univ Sci & Technol Coll Packaging & Printing Engn Tianjin Peoples R China

ISBN: (纸本)9789811000720;9789811000706

WebP is a new image compression technology proposed by Google. It is derived from the VP8 video coding format;it also supports lossless and lossy compressions. Compared with the present popular image format, WebP has smaller volume than JPG and PNG in the condition of the same picture quality conditions. By coding with MATLAB, this experiment adopts the PSNR and SSIM on WebP and JPG, PNG for comparison test, then implement data compression and reduction test. Since MATLAB does not identify the WebP format, this experiment uses canvas to process WebP images, thus measuring the PSNR and WebP of SSIM. the results of experiment show that WebP has high value in the life, it will develop well in the future.

关键词： WebP image compression PSNR SSIM

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