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检索条件"任意字段=Conference on Wavelet Applications in Signal and Image Processing VII"

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Intra-Frame Dyadic Spatial Scalable Coding Based on a Subband/wavelet Framework for MPEG-4 AVC/H.264 Scalable Video Coding

Intra-Frame Dyadic Spatial Scalable Coding Based on a Subban...

引用

IEEE International conference on image processing

作者： Shih-Ta Hsiang ARC-Multimedia Research Lab Motorola Research Laboratories Schaumburg IL USA

This paper develops a new intra-frame dyadic spatial scalable coding framework based on a subband/wavelet coding approach for MPEG-4 AVC/H.264 scalable video coding (SVC). It is the first attempt in the literature to join the subband filter banks with the traditional macroblock and DCT based video coding system. We demonstrate that the current H.264 coding tools and syntax set can efficiently work together with the traditional subband filter banks for providing the improved efficiency for intra-frame dyadic spatial scalable coding. More importantly, unlike the classical wavelet coding, the proposed framework still allows the down-sampling filter to be flexibly designed to generate the ideal low resolution video for target applications. The proposed wavelet tool has been adopted by the JSVM for the next-phase SVC standard.

关键词： MPEG 4 Standard Automatic voltage control Video coding Spatial resolution image coding Filter bank signal resolution Static VAr compensators Transform coding wavelet transforms

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A DCT-Based Watermarking Technique for image Authentication

A DCT-Based Watermarking Technique for Image Authentication

引用

ACS/IEEE International conference on Computer Systems and applications

作者： Mohamed Al Baloshi Mohammed E. Al-Mualla Multimedia Communication and Signal Processing Research Group Etisalat University College-UAE Sharjah UAE

This paper presents a novel DCT-based watermarking method for image authentication. In this method a watermark in the form of a visually meaningful binary pattern is embedded for the purpose of tamper detection. The method embeds one watermark bit in each DCT block by shifting a randomly selected coefficient to have a mapped value, in a coefficient-binary-mapping function, that is identical to the watermark bit. The method was tested under different attacks and was found to provide good detection performance while maintaining the quality of the watermarked image.

关键词： Watermarking Authentication Discrete cosine transforms Discrete wavelet transforms Testing image restoration Multimedia communication signal processing Educational institutions Availability

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Optimal Decomposition Level of Discrete wavelet Transform for Pixel Based Fusion of Multi - Focused images

Optimal Decomposition Level of Discrete Wavelet Transform fo...

引用

International conference on Computational Intelligence and Multimedia applications

作者： K. Kannan S. Arumuga Perumal Department of ECE Kamaraj College of Engineering and Technology Tamil Nadu India Department of Computer Science Saint Hindu College Nagercoil Tamil Nadu India

ISBN: (纸本)9780769530505

The fast development of digital image processing leads to the growth of feature extraction of images which leads to the development of image fusion. image fusion is defined as the process of combining two or more different images into a new single image retaining important features from each image with extended information content. There are two approaches to image fusion, namely Direct Fusion and Multi resolution fusion. In Direct fusion, the pixel values from the source images are directly summed up and taken average to form the pixel of the composite image at that location. Multi resolution fusion uses transform for representing the source image at multi scale. The most common widely used transform for image fusion at multi scale is wavelet Transform. This paper describes the optimal level of decomposition of discrete wavelet transform required for better pixel based fusion of multi focused images in terms of root mean square error, Peak signal to Noise Ratio, Quality Index and image fidelity.

关键词： Discrete wavelet transforms Pixel Focusing image fusion image resolution Digital images Feature extraction Discrete transforms Root mean square PSNR

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Variation operator performance for evolved image reconstruction transforms

Variation operator performance for evolved image reconstruct...

引用

IEEE International conference on Systems, Man and Cybernetics

作者： Michael R. Peterson Gary B. Lamont Frank Moore Brendan Babb Department of Computer Science and Engineering Wright State University Dayton OH USA Department of Electrical and Computer Engineering U.S. Air Force Institute of Technology OH USA Department of Mathematical Sciences University of Alaska Anchorage Anchorage AK USA

Modern image processing applications often require robust performance in noisy or bandwidth-limited situations. In this research, we employ genetic algorithms (GAs) to evolve image transforms that reduce quantization error in reconstructed signals and images. The resulting transforms produce higher quality images than current wavelet-based transforms at a given compression ratio and thus allow transmission of compressed data at a lower bandwidth. We evaluate state-of-the-art variation operators for evolving reconstruction filters. Our results indicate that the careful selection of these operators has a strong positive effect upon the evolutionary search for superior image transforms.

关键词： image reconstruction image coding Quantization Discrete wavelet transforms Multiresolution analysis Filters image processing signal processing algorithms wavelet transforms Bandwidth

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Pulp Fibre Recognition Based on Curvelet Transform and Skeleton Tracing Algorithm

Pulp Fibre Recognition Based on Curvelet Transform and Skele...

引用

IEEE conference on Industrial Electronics and applications (ICIEA)

作者： Jianmei Bian Shubo Qiu Automation Lab Shandong Institute of Light Industry Jinan Shandong China

In the analysis of pulp fibre, the characteristics of pulp fibre are important parameters in papermaking industry. In this paper, the curvelet transform and skeleton tracing method based on preferential direction were introduced to analyze the paper pulp fibre images. The curvelet transform was developed based on the Fourier transform, wavelet transform and radon transform. It has overcome some limitations of wavelet in representing orientations of edges in images. The theory and implementation of curvelet transform were summarized. In this paper, the curvelet transform was used to analyze the pulp fibre images, and the different characteristics of each fibre were extracted to disjoin the intersect fibres; the crossed or furcated fibres were distinguished by the width information. Experiment results showed that the proposed algorithm obtained perfect effects in the analysis of pulp fibre images.

关键词： Skeleton Optical fiber theory image edge detection Fourier transforms wavelet transforms image analysis Algorithm design and analysis signal processing wavelet analysis Character recognition

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A New wavelet Based Compression Scheme Replicating Human Visual System processing

A New Wavelet Based Compression Scheme Replicating Human Vis...

引用

International conference on Computational Intelligence and Multimedia applications

作者： G. Sreelekha P.S. Sathidevi Department of Electronics Engineering National Institute of Technology Calicut Kerala India

ISBN: (纸本)9780769530505;0769530508

A perceptual image coder for the compression of monochrome images is presented here, in which the coding structure is coupled with a vision model to produce coded images with an improved visual quality at low bit-rates. The coder is an improvement on the current image compression standard, JPEG2000. The proposed coding structure incorporates the human vision model in all stages of compression, and gives very good results compared to the existing wavelet based JPEG scheme. Though the mathematical model used are not new, the simple structure of it which can be easily incorporated into the coding structure of the JPEG2000, incorporates the visual processing stages in a very systematic manner in the same way as the visual neurons process the signal. The results presented in this paper reveal that the proposed structure gives very good perceptual quality compared to the existing scheme especially as we go for lower bit rates. One of the major advantages of the proposed scheme is that it can be easily extended to a structure in which the rate control optimization can be incorporated, as in the JPEG2000.

关键词： Humans Visual system image coding Transform coding Optical distortion Optical sensors Discrete wavelet transforms Machine vision Quantization Frequency

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An Efficient Implementation of a 2D DWT on FPGA

An Efficient Implementation of a 2D DWT on FPGA

引用

International conference on Field Programmable Logic and applications

作者： Michael Wisdom Peter Lee Electronics Department University of Kent UK

This paper presents a high-speed implementation of a 2-D fixed-point discrete wavelet transform (DWT) using the embedded DSP48 blocks available on a Xilinx Virtex-4 XC4VLX15-10 FPGA. The full transform uses just 10 DSP48 blocks, 3 block RAMs and 2,126 logic elements when synthesized using Xilinx ISE Version 8.2i and can perform calculations at 197.2 MHz. The results clearly show that by using the DSP48 blocks, it is possible to build computationally efficient DWT algorithms that can operate at higher speeds and with lower overall logic resources than other FPGA solutions that have been reported previously.

关键词： Discrete wavelet transforms Field programmable gate arrays Hardware Low pass filters image coding Logic signal processing algorithms Digital signal processing Finite impulse response filter Computer architecture

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Very Lowbit Rate ideo Codec Based on Diffrentialwavelet Filters

Very Lowbit Rate ideo Codec Based on Diffrentialwavelet Filt...

引用

International conference on Computational Science and its applications (ICCSA)

作者： Mostafa A. Ahmad Ayoub Al-Hamadi Gerald Krell B. Michaelis Signal Processing and Communications Otto-von-Guericke University Magdeburg Magdeburg Germany

State-of-the-art in digital coding/decoding includes discrete image transformation, quantization, and entropy coding. The key to efficient data compression is associated with image transformation/reconstruction processes. In this paper, we present a different filters wavelet-based intra-frame video coding technique. The wavelet transformation is developed and optimized in order to enhance the visual quality especially at very low bit rate. The proposed coding technique reduces the bit rate while performing well regarding PSNR and visual quality. In comparison with the conventional coding methods, our proposed coding technique provides significant performance gains in objective and subjective quality.

关键词： Codecs Filters Bit rate image coding Decoding Quantization Entropy coding Data compression image reconstruction Video coding

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A Rate-Constrained Pre-Compression Bit Allocation Algorithm for Memory Constrained Embedded applications of JPEG2000

A Rate-Constrained Pre-Compression Bit Allocation Algorithm ...

引用

IEEE International conference on signal processing and Communications, ICSPC

作者： Alireza Aminlou Amir Naghdinezhad Mahmoud Reza Hashemi Omid Fatemi Multimedia Processing Laboratory School of Electrical and Computer Engineering University of Tehran Tehran Iran

The execution order of the main components in a JPEG2000 encoder, i.e. the coding sequence, plays a significant role in its performance, implementation cost and memory requirement. The coding sequence is mainly affected by the bit allocation strategy. Existing strategies either require a large working memory or can not be used in rate constrained applications. In this paper, an improved pre-compression bit allocation algorithm for rate-constrained applications of JPEG2000 is proposed. Using the proposed method with multi-layered coding, the memory requirement of a JPEG2000 system is reduced by more than 80%. This is at the expense of a quality degradation of merely 0.47 dB in average, for higher compression ratios of 50 to 100.

关键词： Bit rate image coding Discrete wavelet transforms signal processing algorithms Transform coding Video coding Rate distortion theory Application software Laboratories Embedded computing

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Oversampled Inverse Complex Lapped Transform Optimization

Oversampled Inverse Complex Lapped Transform Optimization

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Jerome Gauthier Laurent Duval Jean-Christophe Pesquet Institut Français du Pétrole IFP Rueil-Malmaison Cedex France Institut Gaspard Monge and UMR CNRS 8049 Université de Marne La Vallée Marne La Vallée

When an oversampled FIR filter bank structure is used for signal analysis, a main problem is to guarantee its invertibility and to be able to determine an inverse synthesis filter bank. As the analysis scheme corresponds to a redundant decomposition, there is no unique inverse filter bank and some of the solutions can lead to artifacts in textured image filtering applications. In this paper, the flexibility in the choice of the inverse filter bank is exploited to find the best-localized impulse responses. The design is performed by solving a constrained optimization problem which is reformulated in a smaller dimensional space. Application to seismic data clearly shows the improvements brought by the optimization process.

关键词： Finite impulse response filter Filter bank Filtering Discrete cosine transforms signal analysis signal synthesis Design optimization wavelet transforms image analysis image texture analysis

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