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共 181 条记录，以下是11-20 订阅

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Crypto-compression of images based on Chaos

Crypto-Compression of Images based on Chaos

引用

6th International conference on Sciences of Electronics, technologies of Information and Telecommunications (SETIT)

作者： Hajji, Jalel Ben Farah, Mohamed Amine Samet, Mounir Kachouri, Abdennaceur Sfax Univ Natl Engn Sch Sfax Lab Elect & Informat Technol Sfax Tunisia Gabes Univ Higher Inst Ind Syst Gabes Tunisia

ISBN: (纸本)9781467316583

In this paper we have proposed an image crypto-compression system that guarantees a secure storage and transfer while preserving the performance of the used compression method. Regarding compression, we have chosen to use the discrete cosine transformation (DCT), Huffman coding and RLE because of their efficiency and their use in most current crypto-compression systems. As for encryption, we have made the choice to use the chaos for its good cryptographic properties. Experimental results confirm that our system is efficient, secure and greatly improve the compression ratio of the image while maintaining the performance of the encryption algorithm.

关键词： compression chaos crypto-compression DCT encryption Huffman coding image RLE coding

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image compression-encryption Scheme Based on 2D DWT, SPIHT and Qi Hyper-chaos

Image Compression-Encryption Scheme Based on 2D DWT, SPIHT a...

引用

27th Southern African Universities Power Engineering conference (SAUPEC) / 11th Robotics and Mechatronics conference of South Africa (RobMech) / 29th Annual Symposium of Pattern-Recognition-Association-of-South-Africa (PRASA)

作者： Lisungu, Tresor Oteko Sumbwanyambe, Mbuyu Univ South Africa Dept Elect & Min Engn Johannesburg South Africa

ISBN: (纸本)9781728103693

With an ever increase usage of multi-media content, such audio, image and video across networks, image compression and security of content has become almost a need to users who would want to transmit over such networks. Transmitting over such networks, especially with images, may result in some information in an image being lost. For that reason good and efficient encryption methods are needed to store and transmit images while preserving the best imaginable quality features enhanced with security. This paper suggests or develops an efficient image compression-encryption scheme based on Discrete wavelet decomposition, SPIHT and Qi hyper-chaos. Pseudo-random numbers generated from Qi hyper chaos and which are in line with the Federal Information Processing Standards (FIPS) and National Institute of Standards and Technology (NIST) were used in this study. The random numbers were used to change the image characteristics and in essence to hide the visual information related to image. To achieve the selective compression-encryption, the 2-D wavelet transform was used to decompose the image into details and approximation components, Set Partitioning in Hierarchical Tree compression method was used to compress the decomposed LL2 image before being encrypted with the bits stream key generated from the Qi hyper-chaos using exclusive or operation. The experimental results demonstrate that the proposed scheme is good for data compression and encryption.

关键词： image compression selective image encryption Discrete Wavelet Transform (DWT) Qi hyper-chaos SPIHT Cryptography

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New image encryption and compression Method Based on Independent Component Analysis

New Image Encryption and Compression Method Based on Indepen...

引用

3rd International conference on Information and Communication technologies

作者： Ito, Masanori Ohnishi, Noboru Alfalou, Ayman Mansour, Ali Nagoya Univ Grad Sch Informat Sci Chikusa Ku Furo Cho Nagoya Aichi 4648603 Japan

ISBN: (纸本)9781424417513

For telecommunication systems, various compression and encryption techniques are proposed to satisfy a fast and secure transmission. However these two techniques have been studied separately. In this paper we propose a method combining encryption and compression based on Independent Component Analysis (ICA) and Discrete Cosine Transform (DCT). For encryption, target images are covered with an insignificant image to hide them and their mixtures to be transmitted are obtained. The receiver reconstructs the original images applying some ICA algorithm to the mixed images. In compression process, using DCT and simple low pass filter, the size of transmission can be reduced. Throughout several computer simulations, the performance of the proposed method is confirmed.

关键词： Discrete cosine transforms

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image encryption Utilizing Lossy image compression 1

Image Encryption Utilizing Lossy Image compression

引用

International conference on Computer Communications and Electronics (Comptelix)

作者： Mishra, Kapil Saharan, Ravi Cent Univ Rajasthan Comp Sci & Engn Dept NH-8 Bandarsindri Kishangarh India

ISBN: (纸本)9781509047086

As the network technologies are improving, more challenges are coming forward in form of huge amount of data being transferred through the network. A large portion of such data is of multimedia type consisting of huge amount of digital images being sent and received through the network. In this paper, an integrated image compression and encryption technique using run length encoding scheme and henon chaotic map is presented. Run length encoding scheme is common scheme and a natural choice for image compression. Run length encoding generates (value, count) pairs such that the value is repeated 'count' number of times. In this paper, we used the run length encoding technique for lossy image compression. We designed a lossy run length encoder that exploits the pixel redundancy and visual imperceptibility of human eye to fine details in the digital images. Along with compression we perform image encryption using henon chaotic map. After encryption the size and resolution of the image is changed that further enhances the security. Various experiments are performed calculating various performance matrices-histogram, information entropy, PSNR, compression ratio, and MSE. The algorithm is secure enough to thwart various statistical attacks while being easy to implement and fast.

关键词： image encryption image compression image processing run length encoding henon chaotic map

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SPIRT compression on encrypted images

SPIRT compression on encrypted images

引用

2013 IEEE conference on Information and Communication technologies, ICT 2013

作者： Rengarajaswamy, C. Rosaline, S. Imaculate Department of Electronics and Communication Engineering Oxford Engineering College India

ISBN: (纸本)9781467357586

A novel technique is proposed for encryption and compression. Here an image is first encrypted using the stream cipher and then compressing the encrypted image using SPIHT. The panorama here stands for using the highly efficient encryption standard and unabating experience of compression techniques. The stream ciphers are chosen for their high encryption rate and they are mainly of bit-by-bit encryption. They don't simply mean encryption but provides authenticity and integrity. Then on the compression section we prefer SPIHT for their unique factors such as larger bit depth, progress from lossy to lossless compression, unrestricted dimensions in image, etc. This paper focuses mainly on highly secure encryption and high compression rate using SPIHT method in Larger images. © 2013 IEEE.

关键词： Cryptography

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Research on wavelet-fractal coding of image sequence

Research on wavelet-fractal coding of image sequence

引用

conference on image compression and encryption technologies

作者： Zhang, ZM Yu, S Tianjin Univ Inst TV & Image Informat Tianjin 300072 Peoples R China

In this paper, a new image sequence compression scheme combining wavelet with fractal is presented. It adopts the coding structure similar to MPEG's except replacing DCT transform with wavelet transform, and uses ... 详细信息

ISBN: (纸本)0819442798

关键词： sequence image coding fractal coding wavelet transformation wavelet-fractal coding

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image encryption Using Separable Reversible Data Hiding Scheme

Image Encryption Using Separable Reversible Data Hiding Sche...

引用

4th International conference on Computing, Communications and Networking technologies (ICCCNT)

作者： Smitha, M. Jayanthi, V. E. Merlin, Ajitha

ISBN: (纸本)9781479939251

image encryption has a significant role in the field of cryptography. A new encryption scheme is introduced to protect an image from unauthorized access, in this scheme two separate keys are used for image encryption and data hiding with high degree of security. The content owner encrypts the original uncompressed image using an encryption key. The least significant bits (LSBs) of the encrypted image are compressed using a data hiding key to create space to embed an additional data. Run-Length Coding (RLC) and Haar Wavelet compression technique is employed to reduce the image size and facilitate faster transmission. Encrypted and decrypted sections, the quality of image retrieval and data extraction are achieved from RLC with their respective keys. In this scheme user can extract an image, data and both image and data based on the keys used.

关键词： Cryptography encryption Haar Wavelet Run Length Coding

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Item Recommendation based on Multimedia Variational Autoencoder

Item Recommendation based on Multimedia Variational Autoenco...

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Asia conference on Geological Research and Environmental Technology (GRET)

作者： Ran, Yu Chen, Ziyu Mu, Yilin Univ Int Business & Econ Sch Informat Technol & Management Beijing 100029 Peoples R China Dalian Ocean Univ Coll Fisheries & Life Sci Dalian 116023 Liaoning Peoples R China Lanzhou Univ Technol Sch Mech & Elect Engn Lanzhou 730050 Gansu Peoples R China

At present, with the rapid development of science and technology and the rapid development of computer related technology, with the development of this series of technologies, multimedia communication has rapidly become the means of communication and communication. Digital image technology, a very important form of information representation in multimedia communication, has now become a mainstream way. The technology provides more convenience for people's lives, but also has many problems, such as security, transmission and storage. For example, some images will involve personal privacy, business secrets, and even government secrets. In addition, the rapid transmission of information in limited bandwidth is also very important. Especially in the presence of cloud storage, it can not only store large amounts of information, such as files, videos and images, but also provide a large enough online space to store shared data. In this case, the real-time and security requirements of information transmission are higher and stricter. It is of great theoretical and practical significance to compress the image and reduce the bandwidth and ensure the security of image encryption. image encryption is also called digital image encryption. image compression is mainly based on the use of different technologies to change the pixel value and location of the image to protect the image. image compression mainly compresses the image by removing redundant or unrelated information. In this paper, the concept of the variational self encoder is introduced firstly, and then the image compression and encryption based on the variational self coder generation model are studied and summarized briefly.

关键词： Multimedia Variational Autoencoder image compression editor decoder

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Decorrelation of multispectral images for lossless compression

Decorrelation of multispectral images for lossless compressi...

引用

conference on image compression and encryption technologies

作者： Zhang, R Liu, ZK Yu, NG Univ Sci & Technol China Hefei 230026 Peoples R China

ISBN: (纸本)0819442798

Decorrelation is the most important step in lossless compression. There are spatial and spectral redundancies in multispectral images. In this paper, we proposed a new technique that integer wavelet transform is used to remove spatial redundancy and non-linear predictors are used to remove spectral redundancy, For computational reason, the number of spectral predictors is discussed. These techniques result in higher compression ratios.

关键词： integer wavelet transform predictors lossless compression

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Near-lossless image compression based on integer wavelet transforms

Near-lossless image compression based on integer wavelet tra...

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conference on image compression and encryption technologies

作者： Moon, YS Tian, JW Chinese Univ Hong Kong Dept Comp Sci & Engn Shatin Hong Kong Peoples R China

ISBN: (纸本)0819442798

This paper discusses the constructing method of a general integer wavelet transform algorithm. Coupling such an algorithm with subblock differential pulse code modulation (DPCM), an encoding scheme for near-lossless image compression is obtained for remote sensing images. This method possesses the following features: (1) real-time processing is possible;(2) hardware implementation is easy;(3) the algorithm is of parallel structure;(4) only addition, subtraction and bit-shift are involved in the processing. Experiments illustrate that our algorithm is an effective encoding scheme to compress remote sensing images.

关键词： image compression integer wavelet transform Lift scheme near-lossless compression remote sensing image

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