检索结果-内蒙古大学图书馆

3D Color Set Partitioning in Hierarchical Trees

CIRCUITS SYSTEMS AND SIGNAL PROCESSING 2009年第1期28卷 41-53页

作者： Kassim, Ashraf A. Tan, Eng Hong Lee, Wei Siong Natl Univ Singapore Dept Elect & Comp Engn Singapore 119260 Singapore

This paper introduces the 3D color set partitioning in hierarchical trees (3D-CSPIHT) low bit rate embedded video coding scheme. The codec exploits the correlation between temporal and spatial wavelet coefficients and the interdependency between luminance and chrominance components to code color video sequences without the need for explicit bit allocation. Besides offering rate scalability, the new codec also produces multi-resolution scalable code streams. The hierarchical variable size block matching motion estimation technique is also integrated to demonstrate the motion estimation option with 3D-CSPIHT. The coding results show that 3D-CSPIHT produces better performance and visual quality compared to 3D-SPIHT.

关键词： SPIHT embedded coding Video compression

来源：评论

学校读者我要写书评

暂无评论

Strip based coding for large images using wavelets

引用

SIGNAL PROCESSING-IMAGE COMMUNICATION 2002年第6期17卷 441-456页

作者： Bhattar, RK Ramakrishnan, KR Dasgupta, KS Indian Space Res Org Ctr Space Applicat Ahmadabad Gujarat India Indian Inst Sci Dept Elect Engn Bangalore 560012 Karnataka India

Thanks to advances in sensor technology, today we have many applications (space-borne imaging, medical imaging, etc.) where images of large sizes are generated. Straightforward application of wavelet techniques for above images involves certain difficulties. embedded coders such as EZW and SPIHT require that the wavelet transform of the full image be buffered for coding. Since the transform coefficients also require storing in high precision, buffering requirements for large images become prohibitively high. In this paper, we first devise a technique for embedded coding of large images using zero trees with reduced memory requirements. A 'strip buffer' capable of holding few lines of wavelet coefficients from all the subbands belonging to the same spatial location is employed. A pipeline architecure for a line implementation of above technique is then proposed. Further, an efficient algorithm to extract an encoded bitstream corresponding to a region of interest in the image has also been developed. Finally, the paper describes a strip based non-embedded coding which uses a single pass algorithm. This is to handle high-input data rates. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： strip based coding embedded coding pipeline architecture KOI wavelet block adaptive scanning

来源：评论

学校读者我要写书评

暂无评论

Progressive meshes transmission over a wired-to-wireless network

引用

WIRELESS NETWORKS 2008年第1期14卷 47-53页

作者： Luo, Xiaonan Zheng, Guifeng Sun Yat Sen Univ Inst Comp Applicat Guangzhou 510275 Peoples R China

The evolution of mobile network and the popularization of mobile devices;the demand for multimedia services and 3D graphics applications on limited resource devices is more contemporary. Most of the works on multimedia transmission are focused on bit errors and packet losses due to the fading channel environment of a wireless network. Error resilient multimedia is significant research topic which can be adapted to the different conditions in a wireless environment. The current solutions in transmission of multimedia across different networks include some type of transcoder where the source is partially or fully decoded, and re-encoded to suit the network conditions. This paper introduces a flexible progressive coding framework for 3D meshes, which can be adapted to the different conditions imposed by wired and wireless channels at the bitstream level. By avoiding the computationally complex steps of transcoding between networks, could deteriorate decoded model quality. The framework also allows refined degradation of model quality when the network conditions are poor due to congestion or deep fades.

关键词： triangular meshes embedded coding progressive transmission wireless network

来源：评论

学校读者我要写书评

暂无评论

Source-channel rate allocation for progressive transmission of images

引用

IEEE TRANSACTIONS ON COMMUNICATIONS 2003年第2期51卷 186-196页

作者： Nosratinia, A Lu, J Aazhang, B Univ Texas Dept Elect Engn Richardson TX 75080 USA Sony Elect Inc San Jose CA 95134 USA Rice Univ Dept Elect & Comp Engn Houston TX 77005 USA

Progressive image transmission is difficult in the presence of a noisy channel, mainly due to the propagation of errors during the decoding of a progressive bitstream. Excellent results for this problem are made possible through combined source-channel coding, a method that matches the channel code to the source operational rate distortion as well as channel conditions. This paper focuses on the key component of combined source-channel coding: rate allocation. We develop a parametric methodology for rate allocation, in progressive source-channel coding. The key to this technique is an empirical model of decoded bit-error rate as a function of the channel code rate. We investigate several scenarios. In the case of the memoryless channel, we present closed-form expressions. For the fading channel and channels with feedback, where closed-form results are elusive, our analysis leads to low-complexity algorithms.. The results presented in this paper are applicable to any progressive source code, and any family of channel codes.

关键词： embedded coding image compression joint source-channel coding progressive transmission rate allocation

来源：评论

学校读者我要写书评

暂无评论

Performance evaluation of 3D hybrid transforms and 2D-set partitioning methods for lossy hyperspectral data compression

引用

SIGNAL IMAGE AND VIDEO PROCESSING 2015年第8期9卷 1881-1888页

作者： Sharma, Shruti Dewal, M. L. Anand, R. S. Indian Inst Technol Dept Elect Engn Roorkee Uttar Pradesh India

Three dimensional nature of hyperspectral data with huge amount of correlation in spatial and spectral domain makes transform coding methods more efficient for compression. Transform methods concentrate signal power in a few coefficients resulting in better low bit rate performance with low computational complexity. A set of 3D hybrid transforms obtained by combining various 1D spectral decorrelator and 2D spatial decorrelator are investigated for their performance evaluation. Wavelet-based methods generate clustered coefficients having parent-child relationship between the subbands. This property can be exploited by entropy encoders to generate bit streams. For entropy encoding, various 2D-set partitioning methods are studied. 2D-set partitioning in hierarchical trees and 2D-tree block encoding exploit parent-child relationship, and 2D-set partitioning in embedded blocks exploits spatial correlation between neighboring pixels within the sub-band in space and frequency of transformed band images. 2D-set partitioning in blocks of hierarchical trees (2D-SPBHT) exploits energy clustering as well as tree structure of wavelet transform simultaneously. It is shown that 2D-SPBHT provides better performance at all the bitrates as compared to other 2D-set partitioning methods irrespective of the 3D transformation used.

关键词： Transform coding embedded coding Energy compaction Hierarchical and tree structure Set partitioning methods

来源：评论

学校读者我要写书评

暂无评论

Progressive scalable interactive region-of-interest image coding using vector quantization

引用

IEEE TRANSACTIONS ON MULTIMEDIA 2005年第4期7卷 680-687页

作者： Ebrahimi-Moghadam, A Shirani, S McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada

We have developed novel progressive scalable region-of-interest (ROI) image compression schemes with rate-distortion-complexity tradeoff based on vector quantization. Residual vector quantization (RVQ) equips the encoder with a multi-resolution apparatus which is useful for rate-distortion tradeoff. Having all advantages of RVQ, jointly suboptimized RVQ provides a distortion-complexity adjustment. The systems are unbalanced in the sense that the decoder has less computational requirements than the encoder. The proposed jointly suboptimized RVQ method provides an interactive tool for fast ROI-based browsing from image archives.

关键词： embedded coding foveation image compression lossy compression region of interest scalability vector quantization

来源：评论

学校读者我要写书评

暂无评论

Highly scalable hybrid image coding scheme

引用

DIGITAL SIGNAL PROCESSING 2008年第3期18卷 364-374页

作者： Mohammed, Usama S. Assiut Univ Dept Elect Engn Assiut 71516 Egypt

This paper describes a highly scalable hybrid image coding scheme (HS-HIC). The proposed hybrid coding scheme combines simply modification of the data in the wavelet domain and the high performance of the set partitioning in hierarchical trees (SPIHT) coding. The modification of the subband image data is done based on the transformation of the high-frequency subband (details) in the wavelet domain. It is based on linear modification of 9-subband image data within three-layer in the wavelet domain. Except the image data in LL3, all other image data will be linearly modified based on the discrete Fourier transform (DFT) components. The modification process provides a new subband image data containing almost the same information as the original one but having a smaller frequency spectrum. The modified data is then located in the corresponding position and the simple SPIHT coder followed by adaptive arithmetic coder is applied on the resulting hierarchical representation to generate the symbol stream. Simulation results demonstrate that, with small addition in the computational complexity of the coding process, the PSNR performance of the proposed algorithm is much higher than that of the SPIHT test coder and some of famous image coding techniques. (c) 2007 Elsevier Inc. All rights reserved.

关键词： image coding wavelet transform embedded coding JPEG-2000 FFT SPIHT EZW EBCOT

来源：评论

学校读者我要写书评

暂无评论

Fixed-Ratio Compression of an RGBW Image and Its Hardware Implementation

引用

IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS 2016年第4期6卷 484-496页

作者： Kim, Sunwoong Kim, Moonsoo Kim, Jin-Sung Lee, Hyuk-Jae Seoul Natl Univ Interuniv Semicond Res Ctr Dept Elect Engn Seoul 151742 South Korea Sun Moon Univ Dept Elect Engn Asan 336708 South Korea

In the latest large-screen TVs, an RGBW color domain is widely used to enhance the brightness of liquid crystal display (LCD) panels. As the correlations among RGBW color components are different from those among conventional RGB components, a compression algorithm developed for an RGB image may not be efficient for RGBW compression. For high-fidelity RGBW image coding, a novel prediction-based coding algorithm is proposed in this paper. The proposed algorithm is composed of two prediction steps that take advantage of spatial correlation and inter-color correlations, respectively. For residual coding, this paper proposes a fixed-ratio coding method based on Golomb-Rice coding. The proposed encoder is composed of two sub-coders: pre-coder and post-coder. The pre-coder estimates the length of the bitstream for various quantization levels. Based on that estimation, the appropriate quantization level is selected. The post-coder generates the final bitstream. Experimental results show that the average peak signal-tonoise ratio (PSNR) of the proposed algorithm is 51.16 dB. The throughput of the proposed encoder and decoder hardwares is 26.7 Gb/s, and their respective gate counts are 56.1 K and 39.6 K.

关键词： embedded coding image coding liquid crystal display (LCD) RGBW color domain variable length coding (VLC) VLSI implementation

来源：评论

学校读者我要写书评

暂无评论

A perceptually based embedded subband speech coder

引用

IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING 1997年第2期5卷 131-140页

作者： Tang, B Shen, A Alwan, A Pottie, G INTEL CORP HILLSBOROOR 97124 UNIV CALIF LOS ANGELES DEPT ELECT ENGNLOS ANGELESCA 90095

A new scheme for robust, high-quality, embedded speech coding based on subband decomposition and perceptually optimized bit allocation and prioritization is presented, An infinite impulse response (IIR) quadrature mirror filterbank (QMF) performs subband decomposition, A perceptual model, computed using subband spectral analysis, optimizes the coder's perceptual quality, Dynamic bit allocation and prioritization is combined with embedded quantization resulting in little performance degradation relative to a nonembedded implementation, The coder output is scalable from high quality at higher bit rates to lower quality at lower bit rates, supporting a wide range of service and resource utilization, The lower bit-rate representation is obtained simply through truncation of the higher bit-rate representation, Since source-rate adaptation is performed through truncation of the encoded stream, interaction with the coder is not required, making the embedded coder ideally suited for rate-adaptive communication systems, performance for both speech and music was verified through subjective listening tests.

关键词： speech coding subband coding embedded coding perceptual metrics

来源：评论

学校读者我要写书评

暂无评论

Three-Dimensional Tarp coding for the Compression of Hyperspectral Images

引用

IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 2004年第2期1卷 136-140页

作者： Wang, Yonghui Rucker, Justin T. Fowler, James E. Mississippi State Univ Mississippi State ERC GRI Dept Elect & Comp Engn Mississippi State MS 39762 USA Mississippi State Univ Mississippi State ERC GRI VAIL Mississippi State MS 39762 USA

An embedded wavelet-based coder for the compression of hyperspectral imagery is described. The proposed coder, three-dimensional (3-D) tarp, employs an explicit estimate of the probability of coefficient significance to drive a nonadaptive arithmetic coder, resulting in a simple implementation suited to vectorized acceleration in single-instruction-multiple-data (SIMD) hardware. The proposed 3-D tarp coder is compared to other prominent coders for the compression of hyperspectral imagery, and state-of-the-art rate-distortion performance is observed.

关键词： embedded coding hyperspectral compression tarp coding three-dimensional wavelet transforms

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：