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检索条件"主题词=fractal coding"

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Method of Single Image Super-Resolution Enhancement Based on fractal coding 3

Method of Single Image Super-Resolution Enhancement Based on...

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3rd International Conference on Computer Science and Network Technology (ICCSNT)

作者： He Si-hua Wu Zhen CPLA Postdoctoral Sci Res Workstn Unit 92493 Huludao Peoples R China CPLA Unit 92941 Huludao Peoples R China

ISBN: (纸本)9781479905614

According to the local characteristics of image similarity and transitivity, self-similarity and scale invariance characteristic of fractal characteristics, use fractal coding as the characteristic of similarity evaluation criteria, search internal image blocks and use the low resolution image analogy fusion in a single image to reconstruct a high resolution image information blocks, implement super-resolution enhancement based on fractal coding. The experimental results show that the fractal coding method can keep the image details better, the reconstruction error is smaller, is better than the bilinear interpolation and bicubic interpolation method.

关键词： fractal coding single image super resolution enhancement self analogy

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Color Video Compression Based on fractal coding Using Quadtree Weighted Finite Automata 2

Color Video Compression Based on Fractal Coding Using Quadtr...

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2nd International Conference on Information Systems Design and Intelligent Applications (INDIA)

作者： Kamble, Shailesh D. Thakur, Nileshsingh V. Malik, Latesh G. Bajaj, Preeti R. Yeshwantrao Chavan Coll Engn Dept Comp Sci & Engn Nagpur Maharashtra India Prof Ram Meghe Coll Engn & Management Dept Comp Sci & Engn Badnera Amravati India GH Raisoni Coll Engn Dept Comp Sci & Engn Nagpur Maharashtra India GH Raisoni Coll Engn Nagpur Maharashtra India

ISBN: (纸本)9788132222477;9788132222460

fractal based compression technique has a very good performance in terms of achieving a high compression ratio and producing a good quality of image/picture. fractal coding technique is limited because of large number of computation is required for searching best possible domain blocks, number of comparisons and transformations applied on each domain blocks present in domain pool. This paper discusses a quadtree based Extended Weighted Finite Automata (EWFA) coding approach for individual frame coding i.e. similar to the intraframe coding. In this approach the quadtree is used to specify the address of each subimage or quadrants for creating a EWFA. We observed that the EWFA encoding process is also similar to fractal encoding process and the size of domain pool increases dynamically during the process of EWFA encoding. Experimentations are carried on standard databases like football, suzie, crew, highway, soccer, ice, and harbour sequence etc.

关键词： fractal coding Domain pool Quadtree Weighted finite automata

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Transmission error robust fractal coding using a model-residual approach

Transmission error robust fractal coding using a model-resid...

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Data Compression Conference

作者： Novak, M Univ Lund Dept Informat Technol S-22100 Lund Sweden

ISBN: (纸本)0818684062

In this article the robustness of fractal code generated by model-residual fractal image coding algorithms is discussed. The code, representing a transformation, is transmitted through a binary symmetric channel introducing random bit errors. These bit errors introduce errors in the transformation and in the decoded image. It is shown that the effects on the decoded image are limited, and that it is possible to approximately well calculate the effects of the errors if the characteristics of the transmission channel are known.

关键词： fractal coding image coding model residual error resilience quantization transmission errors transformation

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Mean-classified and hierarchical block matching watermarking in fractal coding

Mean-classified and hierarchical block matching watermarking...

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4th International Conference on Intelligent Information Hiding and Multimedia Signal Processing

作者： Guo, Jing-Ming Yang, Chung-Te Lee, Jiann-Der Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei Taiwan Chang Gung Univ Dept Elect Engn Taoyuan Taiwan

ISBN: (纸本)9780769532783

This study presents two watermarking approaches in fractal coding images. The fast method, namely Mean-Classified fractal coding (MCFC), partitions the domain blocks of an image into groups according the mean values. As documented in experimental results, a high embedding capacity can be achieved with good image quality. Moreover, the MCFC is proved of highly robust to against many types of attacks, including JPEG, tampering, and rotating. The second method, namely Hierarchical Block Matching fractal coding (HBMFC), utilizes different domain block sizes to enlarge the searching pool with slightly sacrificing the coding gain. The HBMFC is mainly adapted to fragile watermarking, which can be applied to authentication application to prevent from illegal alteration.

关键词： watermarking fractal coding range block domain block mean-classified fractal coding hierarchical block matching fractal coding

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Research on wavelet-fractal coding of image sequence

Research on wavelet-fractal coding of image sequence

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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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Modification of fractal coding algorithm by a combination of modern technologies and parallel computations 16

Modification of fractal coding algorithm by a combination of...

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16th Conference on Optical Fibers and their Applications

作者： Kvyetnyy, Roman N. Sofina, Olga Yu. Lozun, Alla V. Smolarz, Andrzej Zhirnova, Oxana Vinnitsia Natl Tech Univ UA-21021 Vinnitsa Ukraine Lublin Univ Technol Inst Elect & Informat Technol PL-20618 Lublin Poland Kazakh Natl Res Tech Univ Alma Ata 050013 Kazakhstan

The article proposes the application of discrete cosine transformation, Haar wavelet transformation and parallel computation in order to reduce the computational complexity of the fractal coding algorithm and to incre... 详细信息

ISBN: (纸本)9781510600577

关键词： image compression fractal coding discrete cosine transform wavelet transform parallel computing

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Statistical evaluation of fractal coding schemes

Statistical evaluation of fractal coding schemes

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International Conference on Image Processing

作者： Hurtgen, B RHEIN WESTFAL TH AACHEN INST ELEKTR NACHRICHTENTECHD-52056 AACHENGERMANY

ISBN: (纸本)0780331222

This paper reports on investigations concerning the convergence of the reconstruction process in fractal coding schemes from a statistical point of view. For a rather general family of "fractal operators" a necessary and sufficient condition for the convergence based on the spectral radius of the fractal operator is provided. Emerging from this condition the probability density function (PDF) of the magnitude of the eigenvalues is formulated which enables to determine a probabilistic measure for the convergence of the reconstruction process. Since the PDF considerably depends on the structure of the operators, various coding schemes can be analyzed with respect to their convergence properties in a statistical sense. The results presented indicate that certain types of operators are less suited for applications in the field of fractal coding compared to others.

关键词： fractal coding Converge spectral radius Statistical Computing Scheme

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Quad-tree partitioned fractal coding based on region competition strategy - art. no. 679040

Quad-tree partitioned fractal coding based on region competi...

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Symposium on Remote Sensing and GIS Data Processing and Applications;and Innovative Multispectral Technology and Applications

作者： Chen, Yonghong Shi, Zelin Chinese Acad Sci Shenyang Inst Automat Shenyang 110016 Peoples R China

ISBN: (纸本)9780819469540

To deal with the time-consuming problem in the fractal coding, a novel method based on the region competition strategy is introduced to improve the speed of fractal coding effectively. This strategy adopted can discover the optimal affine matching block and the optimal affine transformation of each range block, improving some affine ones with bigger error. Experiments on still life image, fractal image and remote sensing image show that the proposed scheme reduces the compression time and obtains the approximate reconstruction fidelity while it has the same compression ratios as that of adaptive quad-tree partitioned fractal coding.

关键词： fractal coding region competition strategy optimal affine matching block affine transformation

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Adaptive fractal coding UHD Images with Parametric Algorithm

Adaptive Fractal Coding UHD Images with Parametric Algorithm

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International Scientific-Practical Conference - Problems of Infocommunications Science and Technology (PIC S&T)

作者： Patlayenko, Mikola OS Popov Odessa Natl Acad Telecommun Odesa Ukraine

ISBN: (纸本)9781538666111

The results of application of the modified genetic algorithm of fractal coding to still images and video sequences are presented. The dependence of the compression coefficient on the size of the rank block is obtained. Comparison of fractal compression with standard MPEG-4 compression algorithms is performed and it is shown that it is possible to achieve double the compression coefficients at the same signal-to-noise ratio values. In the video sequence, both I-frames and predicted P, B frames were subjected to fractal compression. The simulation results showed what time in seconds is spent when encoding one frame.

关键词： image fractal coding similarity rank and domain blocks compression ratio signal to noise ratio

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An Effective chaos-based image watermarking scheme using fractal coding

An Effective chaos-based image watermarking scheme using fra...

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1st World Conference on Information Technology (WCIT)

作者： Keyvanpour, MohammadReza Merrikh-Bayat, Farnoosh Alzahra Univ Dept Comp Engn Tehran Iran Islamic Azad Univ Dept Comp Engn Qazvin Iran

The image watermarking technology is a technique of embedding hidden data in an original image. In this paper, a new watermarking method for embedding watermark bits based on Chaos-fractal coding is given. A chaotic signal is defined as being deterministic, pseudo periodic and presenting sensitivity to initial conditions. Combining a chaos system with fractal coding plays an important role in the security, invisibility and capacity of the proposed scheme. The main idea of the new proposed algorithm for coding is to determine a set of selective blocks for steady embedding. Simulation results show that the CFC algorithm (Chaos-fractal coding) has a confident capacity. The embedding technique that proposed in this paper is quite general, and can be applied to the extracting scheme with demanded changes. (C) 2010 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of the Guest Editor.

关键词： Image Watermarking fractal coding Chaos Cryptography Arnold's Cat Map Capacity

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