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fractal video sequences coding with region-based functionality

APPLIED MATHEMATICAL MODELLING 2012年第11期36卷 5633-5641页

作者： Zhu, Shiping Hou, Yangshuan Wang, Zaikuo Belloulata, Kamel Beihang Univ Dept Measurement Control & Informat Technol Sch Instrumentat Sci & Optoelect Engn Beijing 100191 Peoples R China Chinese Acad Sci Key Lab Technol Geospatial Informat Proc & Applic Inst Elect Beijing 100190 Peoples R China Univ Djilali Liabes Sidi Bel Abbes Dept Elect Fac Sci Ingn Sidi Bel Abbes 22000 Algeria

In this paper, we explore the fractal video sequences coding in the context of region-based functionality. Since the main drawback of fractal coding is the high computational complexity, some schemes are proposed to speed up the encoding process. As fractal encoding essentially spends most time on the search for the best-matching block in a large domain pool, this paper firstly ameliorates the conventional CPM/NCIM method and then applies a new hexagon block-matching motion estimation technology into the fractal video coding. The images in the video sequences are encoded region by region according to a previously-computed segmentation map. Experimental results indicate that the proposed algorithm spends less encoding time and achieves higher compression ratio and compression quality compared with the conventional CPM/NCIM method. (C) 2012 Elsevier Inc. All rights reserved.

关键词： fractal video coding Region-based coding Motion estimation H.264

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Fast Quadtree Based Normalized Cross Correlation Method for fractal video Compression using FFT

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JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY 2016年第2期11卷 519-528页

作者： Chaudhari, R. E. Dhok, S. B. Visvesvaraya Natl Inst Technol Dept Elect Engn Ctr VLSI & Nanotechnol Nagpur Maharashtra India

In order to achieve fast computational speed with good visual quality of output video, we propose a frequency domain based new fractal video compression scheme. Normalized cross correlation is used to find the structural self similar domain block for the input range block. To increase the searching speed, cross correlation is implemented in the frequency domain using FFT with one computational operation for all the domain blocks instead of individual block wise calculations. The encoding time is further minimized by applying rotation and reflection DFT properties to the IFFT of zero padded range blocks. The energy of overlap small size domain blocks is pre-computed for the entire reference frame and retaining the energies of the overlapped search window portion of previous adjacent block. Quadtree decompositions are obtained by using domain block motion compensated prediction error as a threshold to control the further partitions of the block. It provides a better level of adoption to the scene contents than fixed block size approach. The result shows that, on average, the proposed method can raise the encoding speed by 48.8 % and 90 % higher than NHEXS and CPM/NCIM algorithms respectively. The compression ratio and PSNR of the proposed method is increased by 15.41 and 0.89 dB higher than that of NHEXS on average. For low bit rate videos, he proposed algorithm achieve the high compression ratio above 120 with more than 31 dB PSNR.

关键词： fractal video coding Quadtree FFT Motion estimation SSIM Normalized cross correlation

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Multi-View video Codec with fractal coding

Multi-View Video Codec with Fractal Coding

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IEEE International Conference on Imaging Systems and Techniques (IST)

作者： Zhu, Shiping Li, Liyun Beihang Univ Sch Instrumentat Sci & Optoelect Engn Dept Measurement Control & Informat Technol Beijing 100191 Peoples R China

ISBN: (纸本)9781467357913

The original data of one view video is huge and that of multi-view video is much more. So, data compression is important for multi-views, and data compression is a key technology for multi-views. In this paper, we explore an efficient fractal video codec with multi-views. From the experimental results with the proposed method and other state of the art methods, we can conclude that the proposed algorithm for multi-view coding is robust, and provides less encoding time and high compression ratio while maintaining good compression quality.

关键词： fractal video coding multi-views temporal-spatial prediction structure disparity estimation deblocking loop filter

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An automatic region-based video sequence codec based on fractal compression

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2014年第8期68卷 795-805页

作者： Zhu, Shiping Li, Liyun Chen, Juqiang Belloulata, Kamel Beihang Univ Sch Instrumentat Sci & Optoelect Engn Dept Measurement Control & Informat Technol Beijing 100191 Peoples R China Univ Djilali Liabes Sidi Bel Abbes Fac Sci Ingn Dept Elect Sidi Bel Abbes 22000 Algeria

In order to improve the performance of fractal video coding, we explore a novel fractal video sequences codec with automatic region-based functionality. To increase the quality of decoding image, intra frame coding, deblocking loop filter and sub-pixel block matching are applied to the codec. An efficient searching algorithm is used to increase the compression ratio and encoding speed. Automatic region-based fractal video sequences coding reduces coding stream greatly. Experimental results indicate that the proposed algorithm is more robust, and provides much less encoding time and bitrate while maintaining the quality of decompression image than the conventional CPM/NCIM method and other related references. We compare the proposed algorithm with three algorithms in Refs. [24-26], and the results of all these four algorithms are compared with H.264. The bitrate of the proposed algorithm is decreased by 0.11% and the other algorithms are increased by 4.29%. 6.85% and 11.62%, respectively. The average PSNR degradations of the four algorithms are 0.71 dB, 0.48 dB, 0.48 dB and 0.75 dB. So the bitrate of the proposed algorithm is decreased and the other algorithms are increased. At the meantime the compression time is reduced greatly, about 79.19% on average. The results indicate that, on average, the proposed automatic region-based fractal video sequences coding system can save compression time 48.97% and bitrate 52.02% with some image quality degradation in comparison with H.264, since they are all above 32 dB and the human eyes are insensitive to the differences. (C) 2014 Elsevier GmbH. All rights reserved.

关键词： fractal video coding Pre-searching limitation condition Deblocking loop filter Sub-pixel block matching Automatic region-based coding

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fractal video coding with the orthogonal transformation

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE 2007年第3期90卷 36-47页

作者： Ohse, Koji Nakagawa, Masahiro Nagaoka Univ Technol Fac Engn Nagaoka Niigata 9402188 Japan

fractal coding, which is coding with the self-similarity of the image as redundancy, has recently been studied extensively. In this paper, a method of fractal video coding is proposed in which the redundancy along the time axis is eliminated from a sequence of videos by the orthogonal transformation and then the results are rearranged according to the frequency components before fractal video coding. In comparison with the conventional fractal video coding, the average PSNR is improved with almost identical information content. (C) 2006 Wiley Periodicals, Inc.

关键词： fractal video coding orthogonal transformation frequency domain

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Efficient fractal video coding algorithm using intercube correlation search

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OPTICAL ENGINEERING 2000年第8期39卷 2058-2064页

作者： Wang, CC Hsieh, CH Chung Cheng Inst Technol Dept Elect Engn Taoyuan 33509 Taiwan I Shou Univ Dept Informat Engn Kaohsiung 84004 Taiwan

We propose an efficient fractal video coding algorithm that exploits the correlation between range cubes. Four domain cubes mapped by the previous neighboring range cubes are considered as the good candidates for the input range cube. Two search methods, which take advantage of the correlation between intercubes in the spatial and spatial-temporal directions, are developed to reduce the computational complexity in the encoding phase. In order to raise the compression efficiency, a search-order coding technique is applied to encode the candidate domain cubes. Simulation results show that when the proposed method is implemented with a fast fractal video coding algorithm, it can further reduce the encoding times and bit rate with insignificant loss of video quality. (C) 2000 Society of Photo-Optical instrumentation Engineers. [S0091-3286(00)02508-3].

关键词： fractal video coding image compression video compression search-order coding image processing

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WAVELETS AND fractal IMAGE COMPRESSION BASED ON THEIR SELF-SIMILARITY OF THE SPACE-FREQUENCY PLANE OF IMAGES

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International Journal of Wavelets, Multiresolution and Information Processing 2003年第4期1卷 393-405页

作者： YOSHITO UENO Graduate School of Engineering SOKA University 1-236 Tangi-cho Hachioji-shi Tokyo 192-8577 Japan

This paper presents a fusion scheme for wavelets and fractal image compression based on the self-similarity of the space-frequency plane of sub-bands after wavelet transformation of images. Various kinds of wavelet transform are examined for the characteristics of their self-similarity and evaluated for the adoption of fractal encoder. The aim of this paper is to reduce the information of the two sets of blocks involved in the fractal image compression by using the self-similarity of images. And also, the new video encoder using the fusion method of wavelets and fractal adopts the similar manner as the motion compensation technique of MPEG encoder. Experimental results show almost the same PSNR and bits rate as conventional fractal image encoder by depending on the sampled images through computer simulations.

关键词： Wavelet self-similarity of wavelet transformed image fractal image coding fractal video coding

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