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wavelet based image compression

Wavelet based image compression

引用

Proceedings of the IEEE 12th signal processing and Communications applications conference, SIU 2004

作者： Kaykusuz, M. Ersan Üner, Mücahit K. Hacettepe Üniversitesi Elektrik ve Elektronik Mühendisliǧi Bölümü

ISBN: (纸本)0780383184

In this work, the embedded zerotree wavelet (EZW) coding and the set partitioning in hierarchical trees (SPIHT) coding methods are studied. The effect of the arithmetic coding to the performances of EZW and SPIHT coding methods is analysed. The performances of these two coding methods are compared with the well-known Joint Photographic Experts Group (JPEG) compression method's performance. © 2004 IEEE.

关键词： image compression

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Multiresolution analysis of DEM

Multiresolution analysis of DEM

引用

conference on image and signal processing for Remote Sensing IX

作者： Audenino, P Datcu, M Alcatel Space F-31037 Toulouse France

ISBN: (纸本)0819451215

Digital Elevation Models (DEM) have become important tools in many remote sensing applications, such as classification, defense, Geographic Information Systems, etc. But they are complex products to generate and they are still pervaded with errors and artifacts due to the generation techniques themselves or atmospheric problems. Thus their qualification for a specified application is not guaranteed. It is well known nowadays that the evaluation of the quality of a DEM is a challenging task, due to the variety of requirements depending on the applications and on the end-user. It remains a major field of investigation, where scientists always look for new tools for the analysis of DEM. The use of multiresolution techniques is one possible answer to this research. In the past decades it has been shown that natural landscapes exhibit fractal behaviors. Consequently it seems rather obvious and relevant to use techniques based on fractals and more generally on multi resolution concepts as a tool for understanding the geological nature of terrain. Thanks to the emergence of the use of the wavelet theory, researchers get interested again in fractals modeling for geo information processing and understanding. In this article our aim is to present the various analysis that are possible to lead on DEM thanks to multi resolution methods, in particular wavelet filtering and fractal dimension estimation.

关键词： multiresolution DEM fractals wavelet qualification

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Phase signature-based image authentication watermark robust to compression and coding

Phase signature-based image authentication watermark robust ...

引用

7th conference on Mathematics of Data/image Coding, Compression, and Encryption

作者： Ahmed, F Moskowitz, IS Catholic Univ Amer Dept EECS Washington DC 20064 USA

ISBN: (纸本)0819454990

We present the further development of a watermarking technique that embeds an authentication signal in an image. In this paper, we concentrate on the JPEG 2000 image format. The detection/extraction of this signal can,then be used to decide whether the image has gone through any intentional malicious tampering. Therefore, the watermark needs to be fragile to such tampering attacks. On the other hand, we need to make sure that the authentication is robust to change resulting from the watermarking process itself, or from necessary changes such as image compression. We address the robustness against watermarking process issue in two ways. First, we decompose the image into phase and magnitude values. A signature is then generated from the phase values. In particular, binary phase-only filters and their variants will are utilized for this. This signature is subsequently hidden into the magnitude part by a bit-plane embedding technique. The disjoint operations of signature generation and signature embedding minimize the embedding artifacts of the authentication signal. Secondly, we use wavelet decomposition, whereby, the signature can be generated from one subband, and then it can be embedded in other subband(s), or the same subband.

关键词： authentication wavelet JPEG 2000 watermarking correlation Phasemark (TM)

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A wavelet filter performances criterion

A wavelet filter performances criterion

引用

conference on wavelet applications in Industrial processing II

作者： Nicolier, F Truchetet, F IUT URCA CReSTIC F-10026 Troyes France

ISBN: (纸本)0819455601

In this paper, an objective criterion on wavelet filters in proposed. wavelet transforms are used in number of important signal and image industrial processing tasks including image coding and denoising. The choice of the wavelet filter bank is is very important and is directly linked to the efficiency of the application. Some criteria have been proposed such as regularity, size of the support of the wavelet and number of vanishing moments. The size of the wavelet support increases with the number of vanishing moments. The wavelet regularity is important to reduce the artifacts. The choice of an optimal wavelet is thus the result of a trade-off between the number of vanishing moments and artifacts. But there is only a partial correlation between filter regularity and reconstructed image quality. The proposed criterion is composed of two indexes. The first one is a frequency index computed from the aliasing of the filters. The second is a spatial index computed from the spread of the coefficients in spatial domain. From these indexes a filter set can be represented by a point in a criteria-plan. The abscissa is given by the frequency index and the ordinate by the spatial index. The quality of a wavelet filter bank is a trade-off between frequency and spatial quality. So the quality of a wavelet filter bank can be assessed from the position of the corresponding point in the criteria-plan. The coding and denoising performances are estimated for various filters (including orthogonal splines and Daubechies). These performances are connected to the indexes of each filter bank. The results show that the two proposed indexes allow : a good estimation of the coding and denoising performances of the wavelet filters, an objective comparison of the filters. Some clues on the connection between our indexes and the kernel size in the Heisenberg-Gabor formula are also given.

关键词： wavelets denoising coding Heisenberg-Gabor atom

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Moving region detection in wavelet compressed video

Moving region detection in wavelet compressed video

引用

Proceedings of the IEEE 12th signal processing and Communications applications conference, SIU 2004

作者： Töreyin, B. Uǧur Çetin, A. Enis Aksay, Anil Akhan, M. Bilgay Elektrik ve Elektronik Mühendisliǧi Bölümü Bilkent Üniversitesi Ankara Visioprime Ltd. 30 St Johns Road St Johns Woking Surrey GU21 7SA United Kingdom

ISBN: (纸本)0780383184

In many vision based surveillance systems the video is stored in wavelet compressed form. In this study, an algorithm for moving object and region detection in video that is compressed using a wavelet transform (WT) is developed. The algorithm estimates the WT of the background scene from the WTs of the past image frames of the video. The WT of the current image is compared with the WT of the background and the moving objects are determined from the difference. The algorithm does not perform inverse WT to obtain the actual pixels of the current image nor the estimated background. This leads to a computationally efficient method and a system compared to the existing motion estimation methods. ©2004 IEEE.

关键词： wavelet transforms

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A low memory wavelet zerotree coding for images transmission over noisy channels

A low memory wavelet zerotree coding for images transmission...

引用

6th IASTED International conference on signal and image processing

作者： Wang, N Lin, Y Zheng, SY Li, X Shenzhen Univ Dept Informat Engn Shenzhen 518060 Guangdong Peoples R China

ISBN: (纸本)0889864349

This paper presents a Robust Low Memory Zerotree Coder (RLMZC) with much less working memory. Two distinct bit sequences are designed according to their importance and channel noise sensitivity levels then being protected differently. The RLMZC algorithm abandons the use of lists in most of zerotree coding methods, defines a compact flag map, and introduces the heuristic depth finding strategy in the significant location operation and significant refinement operation. The compact flag map stores the status of coefficients and the heuristic depth finding strategy searches the significant descendant coefficients in tree branches. Furthermore, the proposed algorithm also provides a coding framework that separates the significance bits from the refinement bits, which helps to employ unequal error protection over noisy channels. Comparison of RLMZC with Set Partitioning In Hierarchical Trees(SPIHT) shows that RLMZC saves at least 1.085Mbytes of memory but only reduces minor peak signal-to-noise ratio(PSNR) values for coding a 512 x 512 gray image. For noisy channels our coder is more robust than SPHIT with equal error protection. In addition, RLMZC outperforms another Low Memory Coder (LZC) in both noisy and noiseless channels. The RLMZC is shown to be highly promising for some memory limited applications and noisy channels transmission applications.

关键词： image compression wavelet zerotree coder low memory and noisy channels

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A new lifting scheme for lossless image compression

A new lifting scheme for lossless image compression

引用

conference on applications of Digital image processing XXvii

作者： Hou, HS Aerosp Corp Los Angeles CA 90009 USA

ISBN: (纸本)0819454966

Since its first introduction, the lifting scheme(1,2) has become a powerful method to perform wavelet transforms and many other orthogonal transforms. Especially for integer-to-integer wavelet transforms, the lifting scheme is an indispensable tool for lossless image compression. Earlier work has shown that the number of lifting steps can have an impact on the transform performance.(3) The fidelity of integer-to-integer transforms depends entirely on how well they approximate their original wavelet transforms. The predominant source of errors is due to the rounding-off of the intermediate real result to an integer at each lifting step. Hence, a wavelet transform with a large number of lifting steps would automatically increase the approximation error. In the case of lossy compression, the approximation error is less important because it is usually masked out by the transform coefficient quantization error. However, in the case of lossless compression, the compression performance is certainly affected by the approximation error. Consequently, the number of lifting steps in a wavelet transform is a major concern. The new lifting method presented in this paper reduces the number of lifting steps substantially in lossless data compression. Thus, it also significantly improves the overall rounding errors incurred in the real-to-integer conversion process at each of the lifting steps. The improvement of the overall rounding errors is more pronounced in the integer-to-integer orthogonal wavelet transforms, but the improvement in the integer-to-integer biorthogonal wavelet transforms is also significant. In addition, as a dividend, the new lifting method further saves memory space and decreases signal delay. Many examples on popular wavelet transforms are included.

关键词： integer-to-integer transform image compression lifting method lossless image compression wavelet transform

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Quaternion wavelets for image analysis and processing

Quaternion wavelets for image analysis and processing

引用

2004 International conference on image processing, ICIP 2004

作者： Chan, Wai Lam Choi, Hyeokho Baraniuk, Richard Department of Electrical and Computer Engineering Rice University Houston TX United States

Using the concepts of two-dimensional Hilbert transform and analytic signal, we construct a new quaternion wavelet transform (QWT). The QWT forms a tight frame and can be efficiently computed using a 2-D dual-tree filter bank. The QWT and the 2-D complex wavelet transform (CWT) are related by a unitary transformation, but the former inherits the quaternion Fourier transform (QFT) phase properties, which are desirable for image analysis. The quaternion magnitude-phase representation of the QWT directly leads to near shift-invariance and the ability to encode phase shifts in an absolute xy-coordinate system, which we can use for applications such as edge estimation and statistical image modeling. ©2004 IEEE.

关键词： image analysis

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wavelet-based wavefront control

Wavelet-based wavefront control

引用

conference on Advanced Wavefront Control - Methods, Devices and applications II

作者： Jones, KJ Rice Univ Rice Space Inst Houston TX 77005 USA

ISBN: (纸本)0819454915

The objective of Adaptive Optics is to achieve dynamic correction of severely aberrated systems. This effort will develop a novel adaptive optics approach based on wavelets. Distortions are imprinted on the wavefront in the form of a spatially varying phase field. A wavelet-based method is being developed to subtract out distortions to yield a fully corrected image. This method will be initially developed for laser systems but aims eventually to be used for adaptive optical systems for ground-based telescopes.

关键词： adaptive optics wavefront correction interferometric signal wavelet processing Morlet transform

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Optimal JPEG2000 encoder mechanism for low delay and efficient distribution of HDTV programs

Optimal JPEG2000 encoder mechanism for low delay and efficie...

引用

IEEE International conference on Acoustics, Speech, and signal processing

作者： Naito, S Koike, A Matsumoto, S KDDI R&D Labs Inc Kamifukuoka Saitama 3568502 Japan

Motion JPEG2000 has been developed as a new video coding standard for motion pictures utilizing the still image coding standard JPEG2000. Motion JPEG2000 specifies a normative bitstream syntax that the decoder must recognize and allows flexible selection of detailed coding parameters at the encoder. The compression performance largely depends, therefore, on the encoder design. However, the simple implementation of JPEG2000 encoder might cause picture quality degradation due specifically to wavelet image coding of interlaced TV signals and unsatisfactory bit assignments. That degradation might then become conspicuous in subjective picture quality especially during low bit-rate coding. To overcome this problem, we investigated an optimal design for a Motion JPEG2000 encoder that can be used for primary distribution applications of HDTV programs, assuming that the available bit-rate is approximately 50 Mbps. Our study introduces advanced key technologies not yet recognized officially. Coding experiments using those technologies confirmed that a significant coding gain was achieved versus conventional encoding schemes.

关键词： image coding

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