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检索条件"任意字段=Mathematics of Data/Image Coding, Compression, and Encryption V, with Applications"

共 35 条记录，以下是21-30 订阅

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Dynamic sub-wavelength encryption

Dynamic sub-wavelength encryption

引用

Conference on mathematics of data/image coding, compression and encryption v, with applications

作者： Eckhouse, v Zalevsky, Z Mendlovic, D Tel Aviv Univ Fac Engn Dept Phys Elect IL-69978 Tel Aviv Israel

ISBN: (纸本)0819445606

The suggested device includes a spatial light modulator (SLM) allowing varying the polarization state of an input illumination source. Attached to the SLM a sub wavelength grating is placed per each pixel of the device. This grating is used to encode the input information. The decoding is done by another sub wavelength grating. When the two gratings are attached a variation of the energetic efficiency between the two polarization states occurs. The polarization ratio encrypts the spatial information strewn. The sub wavelength grating are hard to copy and thus high encryption capability is obtained.

关键词： super resolution sub wavelength encryption

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data encryption scheme with extended artithmetic coding

Data encryption scheme with extended artithmetic coding

引用

4th Conference on mathematics of image and data coding, compression, and encryption

作者： Ishibashi, H Tanaka, K Shinshu Univ Fac Engn Nagano 3808553 Japan

ISBN: (纸本)0819441899

In this work, we extend arithmetic coding and present a data encryption scheme that achieves data compression and data security at the same time. This scheme is based on a chaotic dynamics, which makes use of the fact that the decoding process of arithmetic coding scheme can be considered as the repetition of Bernoulli shift map. data encryption is achieved by controlling the piecewise linear maps by a secret key in three kinds of approach: (i) perturbation method, (ii) switching method, and (iii) source extension method. Experimental results show that the obtained arithmetic codes for a message are randomly distributed on the mapping domain [0,1) by using different keys without seriously deteriorating the compression ratio, and the transition of the orbits in the domain [0,1) is similar to the chaotic dynamics.

关键词： arithmetic coding data encryption data compression chaotic dynamical system pieceivise linear map

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Combined data encryption and compression using chaos functions

Combined data encryption and compression using chaos functio...

引用

7th Conference on mathematics of data/image coding, compression, and encryption

作者： Bose, R Pathak, S Indian Inst Technol Dept Elect Engn New Delhi 110016 India

ISBN: (纸本)0819454990

Past research in the field of cryptography has not given much consideration to arithmetic coding as a feasible encryption technique, with studies proving compression-specific arithmetic. coding to be largely unsuitable for encryption. Nevertheless, adaptive modelling, which offers a huge model, variable in structure, and as completely as possible a function of the entire text that has been transmitted since the time the model was initialised, is a suitable candidate for a possible encryption-compression combine. The focus of the work presented in this paper has been to incorporate recent results of chaos theory, proven to be cryptographically secure, into arithmetic coding, to devise a convenient method to make the structure of the model unpredictable and variable in nature, and yet to retain, as far as is possible, statistical harmony, so that compression is possible. A chaos-based adaptive arithmetic coding-encryption technique has been designed, developed and tested and its implementation has been discussed. For typical text files, the proposed encoder gives compression between 67.5% and 70.5%, the zero-order compression suffering by about 6% due to encryption, and is not susceptible to previously carried out attacks on arithmetic coding algorithms.

关键词： symmetric key cryptography variable model arithmetic coding chaos compression encryption

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Benchmarking techniques for evaluation of compression transform performance in ATR applications

Benchmarking techniques for evaluation of compression transf...

引用

7th Conference on mathematics of data/image coding, compression, and encryption

作者： Schmalz, MS Univ Florida Dept Comp & Informat Sci & Engn Gainesville FL 32611 USA

ISBN: (纸本)0819454990

image compression is increasingly employed in applications such as medical imaging, for reducing data storage requirement, and Internet video transmission, to effectively increase channel bandwidth. Similarly, military applications such as automated target recognition (ATR) often employ compression to achieve storage and communication efficiencies, particularly to enhance the effective bandwidth of communication channels whose throughput suffers, for example, from overhead due to error correction/detection or encryption. In the majority of cases, lossy compression is employed due the resultant low bit rates (high compression ratio). However, lossy compression produces artifacts in decompressed imagery that can confound ATR processes applied to such imagery, thereby reducing the probability of detection (Pd) and possibly increasing the rate or number of false alarms (Rfa or Nfa). In this paper, the authors' previous research in performance measurement of compression transforms is extended to include (a) benchmarking algorithms and software tools, (b) a suite of error exemplars that are designed to elicit compression transform behavior in an operationally relevant context, and (c) a posteriori analysis of performance data. The following transforms are applied to a suite of 64 error exemplars: visual Pattern image coding (vPIC [1]), vector Quantization with a fast codebook search algorithm (vQ [2,3]), JPEG and a preliminary implementation of JPEG 2000 [4,5], and EBLAST [6-8]. compression ratios range from 2:1 to 200:1, and various noise levels and types are added to the error exemplars to produce a database of 7,680 synthetic test images. Several global and local (e.g., featural) distortion measures are applied to the decompressed test imagery to provide a basis for rate-distortion and rate-performance analysis as a function of noise and compression transform type.

关键词： image compression error measurement automated target recognition

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Lossless data compression in the space applications

Lossless data compression in the space applications

引用

4th Conference on mathematics of image and data coding, compression, and encryption

作者： Lanza, P Alenia Spazio I-10146 Turin Italy

ISBN: (纸本)0819441899

The first part of the article gives a brief examination of the state of art in terms of methodologies, hardware available and algorithms used in space applications. Particular emphasis is given to the lossless algorithms used and their characterization. In the second part a more detailed analysis, in terms of data entropy, is presented. At the end the preliminary results in the determination of compressibility of the file will be presented.

关键词： entropy data compression estimation of data compression

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Watermarking-based protection of remote sensing images: requirements and possible solutions

Watermarking-based protection of remote sensing images: requ...

引用

4th Conference on mathematics of image and data coding, compression, and encryption

作者： Barni, M Bartolini, F Cappellini, v Magli, E Olmo, G Univ Siena Dept Informat Engn I-53100 Siena Italy

ISBN: (纸本)0819441899

Earth observation missions have recently attracted a growing interest from the scientific and industrial communities, mainly due to the large number of possible applications capable to exploit remotely sensed data and images. Along with the increase of market potential, the need arises for the protection of the image products from non-authorized use. Such a need is a very crucial one even because the Internet and other public/private networks have become preferred means of data exchange. A crucial issue arising when dealing with digital image distribution is copyright protection. Such a problem has been largely addressed by resorting to watermarking technology. A question that obviously arises is whether the requirements imposed by remote sensing imagery are compatible with existing watermarking techniques. On the basis of these motivations, the contribution of this work is twofold: i) assessment of the requirements imposed by the characteristics of remotely sensed images on watermark-based copyright protection ii) analysis of the state-of-the-art, and performance evaluation of existing algorithms in terms of the requirements at the previous point.

关键词： Digital watermarking Remote sensing image resolution image classification image compression Multimedia Algorithm development Electronics visualization image encryption

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Generation of lattice independent vector sets for pattern recognition applications

Generation of lattice independent vector sets for pattern re...

引用

Conference on mathematics of data/image Pattern Recongnition, compression, coding, and encryption X, with applications

作者： Urcid-S., Gonzalo valdiviezo-N., Juan-Carlos INAOE Dept Opt Puebla 72000 Mexico

ISBN: (纸本)9780819468482

Lattice independence and strong lattice independence of a set of pattern vectors are fundamental mathematical proper-ties that lie at the core of pattern recognition applications based on lattice theory. Specifically, the development of morphological associative memories robust to inputs corrupted by random noise are based on strong lattice independent sets, and real world problems, such as, autonomous endmember detection in hyperspectral imagery, use auto-associative morphological memories as detectors of lattice independence. In this paper, we present a unified mathematical framework that-develops the relationship between different notions of lattice independence currently used in the literature. Computational procedures are provided to test if a given set of pattern vectors is lattice independent or strongly lattice independent;in addition, different techniques are fully described that can be used to generate sets of vectors with the aforementioned lattice properties.

关键词： lattice associative memories lattice independence morphological neural networks

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Uniform quantization error for Laplacian sources with applications to JPEG standard

Uniform quantization error for Laplacian sources with applic...

引用

Conference on mathematics of data/image coding, compression, and encryption

作者： Minguillón, J Pujol, J Univ Autonoma Barcelona Bellaterra Spain

ISBN: (纸本)0819429112

In this paper we propose a novel method for computing JPEG quantization matrices based on desired mean square error, avoiding the classical trial and error procedure. First, we use a relationship between a Laplacian source and its quantization error when uniform quantization is used in order to find a model for uniform quantization error. Then we apply this model to the coefficients obtained in the JPEG standard once the image to be compressed has been transformed by the discrete cosine transform. This allows us to compress an image using JPEG standard under a global MSE (or PSNR) constraint and a set of local constraints determined by JPEG standard and visual criteria. Simulations show that our method generates better quantization matrices than the classical method of scaling the JPEG default quantization matrix, with a cost lower than the coding, decoding and error measuring procedure.

关键词： Laplacian sources uniform quantization error JPEG standard

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A cryptanalysis procedure of the data encryption standard

A cryptanalysis procedure of the data encryption standard

引用

mathematics of data/image coding, compression, and encryption vIII, with applications

作者： Silva G., victor Manuel CIDETEC IPN Avenida Te #950 C.P. 08400 Mexico D.F. Mexico

In this paper an attack strategy on the data encryption Standard (DES) that is different from the existing ones is developed. The attack strategy is based on a theorem proved by the author, called LR theorem. The attack can be done by means of a personal computer, i.e. a Pentium Iv based machine. Obviously, more information than a sample of plaintext and ciphertext is required. However, this additional requirement is reduced to a minimum of just 24 bits. The LR theorem uncovers 16 trapdoors of which 2 are of importance. With this knowledge, an attack on Triple-DES can be performed using the aforementioned personal computer. A simple solution to this kind of attack is proposed, preserving the complexity of the Triple-DBS, 2112.

关键词： Cryptography

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On encryption-compression tradeoff of pre/post-filtered images

On encryption-compression tradeoff of pre/post-filtered imag...

引用

mathematics of data/image coding, compression, and encryption vIII, with applications

作者： Gurijala, Aparna Khayam, Syed A. Radha, Hayder Deller Jr., J.R. Department of Electrical and Computer Engineering 2120 Engineering Building Michigan State University East Lansing MI 48824

Advances in network communications have necessitated secure local-storage and transmission of multimedia content. In particular, military networks need to securely store sensitive imagery which at a later stage may be transmitted over bandwidth-constrained wireless networks. This work investigates compression efficiency of JPEG and JPEG 2000 standards for encrypted images. An encryption technique proposed by Kuo et al. in [4] is employed. The technique scrambles the phase spectrum of an image by addition of the phase of an all-pass pre-filter. The post-filter inverts the encryption process, provided the correct pseudo-random filter coefficients are available at the receiver. Additional benefits of pre/post-filter encryption include the prevention of blocking effects and better robustness to channel noise [4]. Since both JPEG and JPEG 2000 exploit spatial and perceptual redundancies for compression, pre/post-filtered (encrypted) images are susceptible to compression inefficiencies. The PSNR difference between the unencrypted and pre/post-filtered images after decompression is determined for various compression rates. compression efficiency decreases with an increase in compression rate. For JPEG and JPEG 2000 compression rates between 0.5 to 2.5 bpp, the difference in PSNR is negligible. Partial encryption is proposed wherein a subset of image phase coefficients are scrambled. Due to the phase sensitivity of images, even partial scrambling of the phase information results in unintelligible data. The effect of compression on partially encrypted images is observed for various bit-rates. When 25% of image phase coefficients are scrambled, the JPEG and JPEG 2000 compression performance of encrypted images is almost similar to that of unencrypted images for compression rates in the 0.5 to 3.5 bpp range.

关键词： image compression

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