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International Conference on Intelligent Computing, Instrumentation and Control Technologies (ICICICT)

作者： Saleem, Shiffa Thomas, Abraham Mathew, Dominic Rajagiri Sch Engn & Technol Dept Appl Elect & Instrumentat Kakkanad Kerala India

ISBN: (纸本)9781509061068

Reversible Data Hiding (RDH) is a technique by which original cover image can be losslessly recovered after embedded data is extracted. RDH combined with encryption provides more security during secret data transmission. In this paper, we propose a secure Reversible Data hiding technique for hiding multiple data types such as text, image and audio within the color images by using Reserve Room Before Encryption approach and bit-plane embedding method using arithmetic coding. Lifting Wavelet Transform (LWT) is applied to the cover image and space is reserved for data hiding from the detailed coefficient subbands of the LWT decomposition. Secret data is encrypted using hyper-chaotic sequence, which is generated according to the secret key. The proposed method can achieve high embedding capacity, improved security and real reversibility that is cover image and embedded data can be recovered without any error.

关键词： Reversible Data Hiding (RDH) Lifting Wavelet Transform (LWT) arithmetic coding Hyper-chaotic encryption PSNR

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Spatio-Temporal Context-Guided Algorithm for Lossless Point Cloud Geometry Compression

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ZTE Communications 2023年第4期21卷 17-28页

作者： ZHANG Huiran DONG Zhen WANG Mingsheng Guangzhou Urban Planning and Design Survey Research Institute Guangzhou 510060China Guangdong Enterprise Key Laboratory for Urban Sensing Monitoring and Early WarningGuangzhou 510060China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan UniversityWuhan 430079China

Point cloud compression is critical to deploy 3D representation of the physical world such as 3D immersive telepresence,autonomous driving,and cultural heritage ***,point cloud data are distributed irregularly and discontinuously in spatial and temporal domains,where redundant unoccupied voxels and weak correlations in 3D space make achieving efficient compression a challenging *** this paper,we propose a spatio-temporal context-guided algorithm for lossless point cloud geometry *** proposed scheme starts with dividing the point cloud into sliced layers of unit thickness along the longest ***,it introduces a prediction method where both intraframe and inter-frame point clouds are available,by determining correspondences between adjacent layers and estimating the shortest path using the travelling salesman ***,the few prediction residual is efficiently compressed with optimal context-guided and adaptive fastmode arithmetic coding *** prove that the proposed method can effectively achieve low bit rate lossless compression of point cloud geometric information,and is suitable for 3D point cloud compression applicable to various types of scenes.

关键词： point cloud geometry compression single-frame point clouds multi-frame point clouds predictive coding arithmetic coding

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Group Testing for Wavelet Packet image compression

Group Testing for Wavelet Packet image compression

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Data Compression Conference (DCC 2001)

作者： Hong, ES Ladner, RE Riskin, EA Univ Washington Dept Comp Sci & Engn Seattle WA 98195 USA

ISBN: (纸本)0769510310

This paper introduces Group Testing for Wavelet Packets (GTWP), a novel embedded image compression algorithm based on wavelet packets and group testing. This algorithm extends the Group Testing for Wavelets (GTW) algorithm [7] to handle wavelet packets. Like its predecessor, GTWP obtains good compression performance without the use of arithmetic coding. It also shows that the group testing methodology is very flexible and can be applied in many different circumstances.

关键词： Group Testing Wavelet packets image compression algorithm arithmetic coding Image compression Data compression

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HARMONIC MODEL FOR MDCT BASED AUDIO coding WITH LPC ENVELOPE

HARMONIC MODEL FOR MDCT BASED AUDIO CODING WITH LPC ENVELOPE

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European Signal Processing Conference

作者： Takehiro Moriya Yutaka Kamamoto Noboru Harada Tom Backstrom Christian Helmrich Guillaume Fuchs Nippon Telegraph and Telephone Corp. (NTT) International Audio Laboratories Erlangen Friedrich-Alexander University (FAU) Fraunhofer Institute for Integrate Circuits (IIS)

ISBN: (纸本)9781479988518

Conventional music coders, based on a modified discrete cosine transform (MDCT) suffer greatly when lowering their bit-rate and delay. In particular, tonal music signals are penalized by short analysis windows and the variable length coding of the quantized MDCT coefficients demands a significant amount of bits for coding the harmonic structure. For solving such an issue, the paper proposes a frequency-domain harmonic model aiming to amend the probability model of the variable length coding of the quantized MDCT coefficients. The new model was combined successfully with an envelope based arithmetic coding at rate lower than 10 kbps, and with a context based arithmetic coding at higher bit rates in the recent 3 GPP EVS (Enhanced Voice Services) codec standard. Objective and subjective quality tests indicate that the proposed harmonic model enhances the quality of music for low-delay audio coding.

关键词： MDCT Envelope Harmonic interval arithmetic coding EVS

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Color personal ID photo compression based on object segmentation

Color personal ID photo compression based on object segmenta...

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IEEE Pacific Rim Conference on Communications, Computers, and Signal Processing

作者： Zhu, QY Wang, SH Shanghai Univ Sch Commun & Informat Shanghai 200072 Peoples R China

ISBN: (纸本)0780391950

The paper studies color personal identification photo compression based on object segmentation. Using an object pattern recognition method, a personal ID photo is divided into three regions--background, head-and-shoulder region and facial region. Different regions have different image qualities. After adopting the Freeman chain code description and its arithmetic coding of background boundary, background adaptive gray padding, bit-plane shift quality graded compression algorithm, and JPEG2000 based wavelet transform and EBCOT coding scheme, a good result that is better than the standard JPEG-2000 is obtained.

关键词： data compression image coding image colour analysis image segmentation object recognition wavelet transforms Freeman chain code description JPEG-2000 based wavelet transform arithmetic coding background adaptive gray padding background boundary bit-plane arithmetic coding wavelet transforms image colour analysis Object segmentation Identification photographs image coding Data compression object recognition image segmentation Image quality

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An efficient, optimized JPEG2000 tier-1 coder hardware implementation

An efficient, optimized JPEG2000 tier-1 coder hardware imple...

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Conference on Visual Communications and Image Processing 2003

作者： Schumacher, P Xilinx Res Labs Longmont CO 80503 USA

ISBN: (纸本)0819450235

It is a well-known fact that the major bottleneck of a JPEG2000 encoder is the bit/context modeling and arithmetic coding tasks (also known together as the tier-1 coding portion of EBCOT). Whereas the technique of using multiple coding passes on multiple bit-planes follows a near-optimal path on the rate-distortion curve and helps create an elegant embedded codestream, this tier-1 coding requires a large amount of computation for each block of data as well as significant memory resources and memory accesses. Luckily, the JPEG2000 standard allows us to perform a number of the tier-1 coding tasks in parallel. If this parallelism is exploited and if smart data organization techniques are used, then the throughput of a JPEG2000 system can be dramatically improved. This paper discusses an efficient, optimized hardware implementation of a tier-1 coder that exploits these available parallelisms. This paper also describes implementation on Xilinx FPGA platforms. The proposed technique described in this paper is approximately 50% faster than the best technique described in the literature.

关键词： JPEG2000 EBCOT arithmetic coding hardware implementation FPGA

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Triangle mesh compression along the Hamiltonian cycle

Triangle mesh compression along the Hamiltonian cycle

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Computer Graphics International (CGI) Conference

作者： Zhang, Jie Zheng, Changwen Hu, Xiaohui Chinese Acad Sci Inst Software Natl Key Lab Integrated Informat Syst Technol Beijing Peoples R China Chinese Acad Sci Grad Univ Beijing Peoples R China

This paper proposes a novel and efficient algorithm for single-rate compression of triangle meshes. The input mesh is traversed along its greedy Hamiltonian cycle in O(n) time. Based on the Hamiltonian cycle, the mesh connectivity can be encoded by a face label sequence with low entropy containing only four kinds of labels (HETS) and the transmission delay at the decoding end that frequently occurs in the conventional single-rate approaches is obviously reduced. The mesh geometry is compressed with a global coordinate concentration strategy and a novel local parallelogram error prediction scheme. Experiments on realistic 3D models demonstrate the effectiveness of our approach in terms of compression rates and run time performance compared to the leading single-rate and progressive mesh compression methods.

关键词： Triangle mesh Mesh compression Hamiltonian cycle Connectivity coding Geometry coding arithmetic coding

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Symbolic Dynamics of the Weyl Chamber Flow

Symbolic Dynamics of the Weyl Chamber Flow

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作者： Egorov, Arseni PennState University Libraries

学位级别：Doctor of Philosophy

This thesis studies codings of orbits of Weyl chamber ﬂows on symmetric spacesof non-compact type.
Let H be the hyperbolic plane with constant curvature −1 and Γ be a Fuchsiangroup of ﬁnite covolume. Let D be a Dirichlet domain of Γ on H. The main resultshows that the set of cutting sequences of all geodesics in the sense of Morse withrespect to the tessellation of H, formed by the sets gD, g ∈ Γ, is a topologicalMarkov chain if and only if D does not have vertices in H.
Also, a background is provided for the study of generalization of continuedfractions to higher dimensions. So-called arithmetic Gauss coding of geodesics onH is described along with its relation with the minus continued fractions. H is aparticular case of a symmetric space of non-compact type, H = SL₂R/SO₂R, andthe geodesic ﬂow on H implements the Weyl chamber ﬂow on it. A generalizationof the minus continued fractions was suspected by S. Katok and A. Katok to exist,which involves orbits of Weyl chamber ﬂows on symmetric spaces of non-compacttype SL_nR/SO_nR and their compactiﬁcations.

关键词： topological Markov chains geodesic flow Weyl chamber flow geometric coding arithmetic coding symmetric spaces continued fractions

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ENHANCED SCALABLE TO LOSSLESS AUDIO coding SCHEME

ENHANCED SCALABLE TO LOSSLESS AUDIO CODING SCHEME

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Haiyan Shu Haibin Huang Te Li Susanto Rahardja Signal Processing Department Institute for Infocomm Research Agency for Science Technology & Research Singapore 138632

ISBN: (纸本)9781424442959;9781424442966

Scalable to lossless (SLS) audio coding is a state-of-art audio coding technique that has been adopted as MPEG scalable audio coding tool. To realize bit-plane refinement, this technique employs bit-plane arithmetic coding for lossless entropy coding, and Laplacian distribution is used to model the input data to realize high compression efficiency. In this paper, bit-plane probability is analyzed when generalized Gaussian distribution is used to model the input data. Based on the result of bit-plane probability for generalized Gaussian distribution, a low cost bit-plane arithmetic coding method is presented. This scheme is implemented in the SLS audio coding platform. With the same computational complexity, the proposed algorithm presents higher compression efficiency than SLS.

关键词： Scalable to lossless audio coding arithmetic coding bit-plane probability generalized Gaussian distribution

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Effect of Gray coding on The State and The Distribution of Data Bits in Cross Point Regions

Effect of Gray Coding on The State and The Distribution of D...

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2004 3rd International Conference on Computational Electromagnetics and Its Applications

作者： DANG Thanh Tin VU Dinh Thanh NGUYEN Kim Sach Seihaku HIGUCHI Faculty of Electrical and Electronic Engineering Hochiminh city University of Technology Department of Information System Engineering Faculty of EngineeringOsaka Sangyo University

This paper supplements the effect of Gray code transformation on cross points which are neighbor to the points of gray levels 2 with Gray codes of cross points on bit plane *** the natural characteristic of images,the data do not change much in a specific area,so at first the effect of Gray codes is determined with an adjacent data set,then it will be generalized for real data without losing the generality of their statistical characteristics,espescially in medical images which contain many regions having the same gray scale.A further conclusion,being also a consequence of this effect,is the change of data bits for Gray codes in the regions of cross points from original data *** makes the probabilities of data bits on specific bit planes in those regions and then the entropies of messages,be *** fact has important effects on encoding and decoding processes.

关键词： Gray code cross poin cross point region probability of bits arithmetic coding

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