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

共 56 条记录，以下是21-30 订阅

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Bit plane encoding and encryption

引用

2nd International Conference on pattern Recognition and Machine Intelligence

作者： Yekkala, Anil Madhavan, C. E. Veni Philips Elect India Ltd Bangalore Karnataka India Indian Inst Sci Bangalore Karnataka India

ISBN: (纸本)9783540770459

The rapid growth in multimedia based Internet systems and applications like video telephony, video on demand and also tele-medicine has created a great need for multimedia security. One of the important requirements for multimedia security is encryption. Owing to the size of multimedia data and real time requirements, lightweight encryption schemes are important. Lightweight encryption schemes are based on taking the structure of multimedia data into consideration and partially encrypting the content. Even though several lightweight encryption schemes are existing for lossy compression schemes, their do not exist any lightweight encryption scheme for lossless compression. In this paper we present a lossless compression scheme for image, and we show how this scheme can be also used for supporting scalable lightweight encryption.

关键词： image coding

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Proceedings of SPIE - mathematics of data/image pattern Recognition, compression, and encryption with applications IX

Proceedings of SPIE - Mathematics of Data/Image Pattern Reco...

引用

mathematics of data/image pattern Recognition, compression, and encryption with applications IX

ISBN: (纸本)0819463949

The proceedings contain 23 papers. The topics discussed include: biorthogonal wavelets of maximum coding through pseudoframes for subspaces;a skinning prediction scheme for dynamic 3D mesh compression;multi-modal multi-fractal boundary encoding in object-based image compression;perspectives on data compression methods for network-level management of multi-sensor systems;exploiting data compression methods for network-level management of multi-sensor systems;a model utilizing artificial neural network for perceptual image;use of adaptive models in watermark identification;data payload optimality: a key issue for for video watermarking applications;quantization index modulation-based watermarking using holography;the optimum estimation of statistical signals based on systematic expression of many types of sample arrays in multidimensional space;and segmentation of motion textures using mixed-state Markov random fields.

关键词： pattern recognition

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Maximizing reading: pattern analysis to describe points of gaze

Maximizing reading: pattern analysis to describe points of g...

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Conference on mathematics of data/image pattern Recognition, compression and encryption with Application IX

作者： Paeglis, Roberts Bagucka, Kristine Sjakste, Nikolajs Lacis, Ivars Latvian Univ Dept Vis Sci 8 Kengaraga Str LV-1063 Riga Latvia Univ Latvia Fac Med LV-1001 Riga Latvia

ISBN: (纸本)0819463949

As people read texts, their points of gaze can be described either as a sequence or as a pattern of dots. If reading fixations are visualized as a pattern and their duration is graphically attributed to the 3(rd) dimension, image processing techniques can be employed to describe individual reading styles. Two reader groups of text editors and of University students were matching according to parametric tests. Yet they appeared to have marked inter-subject variability of fixation distribution when individual cases were considered. To illustrate this, we applied a simple "Coulomb law"- like model that takes both fixation duration and spacing into account. Further the image entropy filter was shown to distinguish the readers by the extreme value points. Statistical averaging can level out differences in reading patterns that appear by image processing techniques.

关键词： skilled reader eye movements fixation texture MATLAB iViewX

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The synaptic morphological perceptron

The synaptic morphological perceptron

引用

Conference on mathematics of data/image pattern Recognition, compression and encryption with Application IX

作者： Myers, Daniel S. Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0819463949

In recent years, several researchers have constructed novel neural network models based on lattice algebra. Because of computational similarities to operations in the system of image morphology, these models are often called morphological neural networks. One neural model that has been successfully applied to many pattern recognition problems is the single-layer morphological perceptron with dendritic structure (SLMP). In this model, the fundamental computations are performed at dendrites connected to the body of a single neuron. Current training algorithms for the SLMP work by enclosing the target patterns in a set of hyperboxes orthogonal to the axes of the data space. This work introduces an alternate model of the SLMP, dubbed the synaptic morphological perceptron (SMP). In this model, each dendrite has one or more synapses that receive connections from inputs. The SMP can learn any region of space deter-mined by an arbitrary configuration of hyperplanes, and is not restricted to forming hyperboxes during training. Thus, it represents a more general form of the morphological perceptron than previous architectures.

关键词： morphological neural network morphological perceptron lattice algebra pattern recognition

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data payload optimality:: a key issue for video watermarking applications

Data payload optimality:: a key issue for video watermarking...

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Conference on mathematics of data/image pattern Recognition, compression and encryption with Application IX

作者： Mitrea, M. Duta, S. Preteux, F. Vlad, A. GET INT ARTEMIS Dept Evry France POLITEH Univ Fac Elect & Telecommun Bucharest Romania Romanian Acad Res Inst Artificial Intelligence Bucharest Romania

ISBN: (纸本)0819463949

Watermarking aims at enforcing property right for digital video: a mark is imperceptibly - transparently - embedded into original data. The true owner is identified by detecting this mark. The robust watermarking techniques allow the mark detection even when the protected video is attacked. Transparency and robustness constraints restrict the mark size: the better transparency and robustness, the smaller the data payload. The paper presents a method to evaluate the maximum quantity of information which can be theoretically inserted into the 2D-DCT coefficient hierarchy, for prescribed transparency and robustness. This approach relies on the noisy channel model for watermarking. Within this mathematical framework, the maximal data payload is expressed by the channel capacity. As any capacity evaluation procedure requires an intimate knowledge of the noise sources, the paper first describes the developed statistical approach enabling: (1) to properly handle the inner dependency existing among successive frames in a video sequence, and (2) to accurately check-out the Gaussian behaviour for each noise source. The experiments were carried out in partnership with the SFR mobile service provider in France (Vodafone group).

关键词： video watermarking attack statistical analysis watermarking capacity

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Proceedings of SPIE mathematics of data/image coding, compression, and encryption VIII, with applications

Proceedings of SPIE Mathematics of Data/Image Coding, Compre...

引用

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

The proceedings contain 21 papers. The topics discussed include: a cryptanalysis procedure of the data encryption standard;an adaptive watermarking scheme in the DCT domain;robust video watermarking using additional watermarking techniques;computational complexity of object-based image compression;error measures for object-based image compression;exploiting the distributed source coding paradigm for low-complexity compression of hyperspectral images;fast feature extraction in hyperspectral imagery via lifting wavelet transforms;deformable block motion compensation scheme for aerial video surveillance coding;minimax eigenvector decomposition for data hiding;and selective weighing on wavelet coefficients for blind image watermarking system.

关键词： Imaging systems

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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...

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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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Double random phase spread spectrum spread space technique for secure parallel optical multiplexing with individual encryption key

Double random phase spread spectrum spread space technique f...

引用

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

作者： Hennelly, B.M. Javidi, B. Sheridan, J.T. Department of Electronic and Electrical Engineering Faculty of Engineering and Architecture University College Dublin Belfield Dublin 4 Ireland Department of Electrical and Computer Engineering University of Connecticut Storrs CT 06269-2157

A number of methods have been recently proposed in the literature for the encryption of 2-D information using linear optical systems. In particular the double random phase encoding system has received widespread attention. This system uses two Random Phase Keys (RPK) positioned in the input spatial domain and the spatial frequency domain and if these random phases are described by statistically independent white noises then the encrypted image can be shown to be a white noise. Decryption only requires knowledge of the RPK in the frequency domain. The RPK may be implemented using a Spatial Light Modulators (SLM). In this paper we propose and investigate the use of SLMs for secure optical multiplexing. We show that in this case it is possible to encrypt multiple images in parallel and multiplex them for transmission or storage. The signal energy is effectively spread in the spatial frequency domain. As expected the number of images that can be multiplexed together and recovered without loss is proportional to the ratio of the input image and the SLM resolution. Many more images may be multiplexed with some loss in recovery. Furthermore each individual encryption is more robust than traditional double random phase encoding since decryption requires knowledge of both RPK and a lowpass filter in order to despread the spectrum and decrypt the image. Numerical simulations are presented and discussed.

关键词： Spread spectrum communication

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Fractal based techniques and their applications

Fractal based techniques and their applications

引用

作者： Lai, Cheung-Ming Hong Kong Polytechnic University (Hong Kong)

学位级别：Ph.D.

The aim of this research is to develop efficient algorithms for fractal image coding, which can be applied in digital image compression, image magnification and image denoising. Fractal image coding can provide a highly reconstructed image quality with a high compression ratio, is independent of resolution, and has a fast decoding process. The problem with fractal coding is its high computational complexity in the encoding process. Most of the encoding time is spent finding the best-matched domain block from a large domain pool to represent an input range block with respect to contrast and intensity offset, as well as the isometry transformations. The objectives of this research are to investigate and develop efficient techniques for fractal image coding, fractal-based image magnification and denoising. In this thesis, four efficient fractal image-coding algorithms have been proposed. The first algorithm is based on new feature vectors and the property of zero contrast. The proposed feature vectors can provide a better representation of image blocks, and thus result in a more efficient search of the domain block. The second algorithm is an efficient windowing scheme for fractal image coding based on the local variances method. In our method, windows covering those domain blocks whose variances are higher than that of the range block are considered according to a mathematical model. The exhaustive search algorithm can obtain the optimal result by searching all the blocks within the domain pool, but this process requires a high computational cost, which limits its practical application. A single kick-out condition is proposed which can avoid a large number of range-domain block matches when finding the best-matched domain block. An efficient method for zero contrast prediction is also proposed, which can determine whether the contrast factor for a domain block is zero or not, and compute the corresponding difference between the range block and the transformed domain b

关键词： Hong Kong Polytechnic University -- Dissertations. image compression. image processing -- Digital techniques -- mathematics. Fractals. data encryption (Computer science)

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