检索结果-内蒙古大学图书馆

An efficient architecture of bitplane coding with high frame rate for VC-1

SIGNAL PROCESSING-IMAGE COMMUNICATION 2008年第9期23卷 692-698页

作者： Lim, Yo-Han Kang, Jung-Sun Semicond Business Samsung Elect Co Ltd Syst LSI Div Youngin City 446711 Gyeonggi Do South Korea

In this paper, we present an efficient hardware architecture of bitplane coding in VC-1. bitplane coding has demerit of implementation area because bitplane coding supports seven different decoding modes. Also. particular mode consumes many clock cycles. In order to reduce the area, we use suitable register banks that different modes share for decoding and use two SRAMs that are shared for different frames. Also, we designed MODE2 and DIFF modules with high-performance capability to account for the intensive processing that Differential-2 mode undergoes. The hardware implementation, based on 0.065-mu m standard cell library, consumes only 19.52K (excluding two 135 x 40 SRAMs) gates at a clock frequency of 133 MHz. Our architecture supports real-time bitplane coding for high-resolution (1280 x 720) video at 30 fps. (C) 2008 Elsevier B.V. All rights reserved.

关键词： VC-1 WMV-9 Video coding bitplane coding

来源：评论

学校读者我要写书评

暂无评论

Mutual information-based context template modeling for bitplane coding in remote sensing image compression

引用

JOURNAL OF APPLIED REMOTE SENSING 2016年第2期10卷

作者： Zhang, Yongfei Cao, Haiheng Jiang, Hongxu Li, Bo Beihang Univ Sch Comp Sci & Engn Beijing Key Lab Digital Media Beijing 100191 Peoples R China Beihang Univ State Key Lab Virtual Real Technol & Syst Beijing 100191 Peoples R China

As remote sensing image applications are often characterized with limited bandwidth and high-quality demands, higher coding performance of remote sensing images are desirable. The embedded block coding with optimal truncation (EBCOT) is the fundamental part of JPEG2000 image compression standard. However, EBCOT only considers correlation within a sub-band and utilizes a context template of eight spatially neighboring coefficients in prediction. The existing optimization methods in literature using the current context template prove little performance improvements. To address this problem, this paper presents a new mutual information (MI)-based context template selection and modeling method. By further considering the correlation across the sub-bands, the potential prediction coefficients, including neighbors, far neighbors, parent and parent neighbors, are comprehensively examined and selected in such a manner that achieves a nice trade-off between the MI-based correlation criterion and the prediction complexity. Based on the selected context template, a high-order prediction model, which jointly considers the weight and the significance state of each coefficient, is proposed. Experimental results show that the proposed algorithm consistently outperforms the benchmark JPEG2000 standard and state-of-the-art algorithms in term of coding efficiency at a competitive computational cost, which makes it desirable in real-time compression applications, especially for remote sensing images. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： remote sensing image compression bitplane coding context modeling mutual information

来源：评论

学校读者我要写书评

暂无评论

bitplane coding of DCT coefficients for image and video compression

Bitplane coding of DCT coefficients for image and video comp...

引用

Meeting on Visual Communications and Image Processing

作者： Ling, F Li, WP Sun, HQ Gen Instrument San Diego CA 92121 USA

ISBN: (纸本)0819431249

In the current image and video coding standards, such as MPEG-1, MPEG-2, MPEG-4, H.261, H.263, and JPEG, quantized DCT coefficients are entropy coded using a so-called run-value coding technique. A. problem with this technique is that the statistics of the run-value symbols are highly dependent on the quantization step size and the dynamic range of the DCT coefficients. Therefore, a single fixed entropy coding table cannot achieve the optimal coding efficiency for all possible quantization step sizes and all possible dynamic ranges of the DCT coefficients. bitplane coding of the DCT coefficients is a new coding scheme that overcomes this problem. It provides a better performance than run-value coding under all conditions.

关键词： image and video compression quantization entropy coding run_value coding bitplane coding

来源：评论

学校读者我要写书评

暂无评论

LOSSLESS COMPRESSION OF LOGLUV32 HDR IMAGES BY SIMPLE bitplane coding

LOSSLESS COMPRESSION OF LOGLUV32 HDR IMAGES BY SIMPLE BITPLA...

引用

Picture coding Symposium (PCS)

作者： Kikuchi, Hisakazu Deguchi, Taiyo Okuda, Masahiro Niigata Univ Dept Elect & Elect Engn Nishi Ku Igarashi 2 Niigata 9502181 Japan City Univ Kitakyushu Dept Informat & Media Engn Wakamatsu Ku Kitakyushu Fukuoka 8080135 Japan

ISBN: (纸本)9781479902941

A method of lossless compression of high dynamic range (HDR) images encoded in LogLuv32 format is presented. Simple bitplane coding (SBC) is independently applied to the components of LogLuv data. A context model for coding a bit is created by a comparison of neighboring pixel values, and is fed to a range coder. As a result, the average bit rate of 9.8 bits/pixel was obtained in lossless compression of popular 34 LogLuv32 HDR images. That is, a set of those data shrinks to 31% of the uncompressed data size on average.

关键词： High dynamic range image image compression lossless compression bitplane coding

来源：评论

学校读者我要写书评

暂无评论

An efficient architecture of bitplane coding in VC-1 for real-time video processing

An efficient architecture of bitplane coding in VC-1 for rea...

引用

7th IEEE International Symposium on Signal Processing and Information Technology

作者： Lim, Yo-Han Jun, Seung-Sick Kang, Jung-Sun Semicond Business Samsung Elect Co Ltd Syst LSI Div Youngin City South Korea

ISBN: (纸本)9781424418343

In this paper, we propose an efficient hardware architecture of the bitplane coding for VC-1. The bitplane coding has demerit of area, since the bitplane coding has all different 7 modes for decoding. Also, particular mode consumes many clock cycles. In order to reduce area, we use register banks that different modes share for decoding and two SRAMs that are shared for different frames. Also, we carefully designed MODE2 and DIFF module for high performance, because Differential-2 mode was the worst case. The experimental result shows that under 0.065 mu m CMOS technology, the synthesized logic gate count is only 19.52K (not include two 135x40 SRAMs) when the maximum frequency is 133 MHz. Our architecture can easily support real-time processing of bitplane coding for 720p (1280x720) 30Hz video.

关键词： VC-1 WW-9 video coding bitplane coding

来源：评论

学校读者我要写书评

暂无评论

Contextual bitplane coding for DWT image compression 5

Contextual bitplane coding for DWT image compression

引用

Conference on Storage and Retrieval for Image and Video Databases V

作者： NguyenPhi, K Weinrichter, H Technische Univ. Wien (Austria)

ISBN: (纸本)0819424331

We propose anew simple image coder based on Discrete Wavelet Transform (DWT). The DWT coefficients are coded in bitplanes. We use a variable order Markovian model to code the DWT coefficient bitplanes. Recently, we have developed this method that used 65 contexts(7). In this paper, the number of contexts is reduced to 34. We show the experimental results, both in terms of distortion measurement and visual comparison, and compare them to well-known methods.

关键词： wavelet image compression bitplane coding zero-tree coding

来源：评论

学校读者我要写书评

暂无评论

GPU Paralleled Transformation and Quantization for Wavelet-Based bitplane coding of Multiresolution Meshes 12

GPU Paralleled Transformation and Quantization for Wavelet-B...

引用

12th International Conference on Machine Vision (ICMV)

作者： Hachicha, Soumaya Elkefi, Akram Ben Amar, Chokri Zaied, Mourad Univ Sfax ENIS REGIM Lab REs Grp Intelligent Machines BP 1173 Sfax 3038 Tunisia

ISBN: (纸本)9781510636446

Fast mesh compression is becoming a requisite in several applications such as medical imaging and video games. Graphics Processing Units (GPUs) are recently becoming massively parallel devices for Single Instruction, Multiple Data (SIMD) computing, addressing hence greater implementation challenges. Transformation and Quantization (TQ) is considered the second highest workload part of the wavelet-based mesh coding. Therefore, its acceleration will further improve the overall processing speed of the coding. In this paper, an OpenCL (Open Computing Language) acceleration of TQ is proposed. The Butterfly Wavelet Transform (BWT) based on the unlifted scheme is adopted in the transformation method while the embedded deadzone quantization is employed for the wavelet quantization. A chunk rearrangement process is applied for the computation of the neighborhood information needed for the Butterfly subdivision stencils. Accordingly, every chunk proceeds independently the prediction of the wavelet coefficients and their quantization. The key insights behind the proposed TQ method on GPU are a smart memory management and an efficient memory data mapping. Extensive experimental assessments demonstrate the effectiveness of our GPU implementation in terms of memory and runtime costs while preserving the rate distortion performance of the state-of-the-art bitplane coder.

关键词： Multiresolution mesh bitplane coding GPU SIMD OpenCL TQ unlifted BWT

来源：评论

学校读者我要写书评

暂无评论

Distortion Estimators for bitplane Image coding

引用

IEEE TRANSACTIONS ON IMAGE PROCESSING 2009年第8期18卷 1772-1781页

作者： Auli-Llinas, Francesc Marcellin, Michael W. Univ Autonoma Barcelona Dept Informat & Commun Engn Barcelona 08290 Cerdanyola Vall Spain Univ Arizona Dept Elect & Comp Engn Tucson AZ 85721 USA

bitplane coding is a common strategy used in current image coding systems to perform lossy, or lossy-to-lossless, compression. There exist several studies and applications employing bitplane coding that require estimators to approximate the distortion produced when data are successively coded and transmitted. Such estimators usually assume that coefficients are uniformly distributed in the quantization interval. Even though this assumption simplifies estimation, it does not exactly correspond with the nature of the signal. This work introduces new estimators to approximate the distortion produced by the successive coding of transform coefficients in bitplane image coders, which have been determined through a precise approximation of the coefficients' distribution within the quantization intervals. Experimental results obtained in three applications suggest that the proposed estimators are able to approximate distortion with very high accuracy, providing a significant improvement over state-of-the-art results.

关键词： bitplane coding distortion estimation image coding JPEG2000 rate-distortion optimization

来源：评论

学校读者我要写书评

暂无评论

Stationary Probability Model for bitplane Image coding Through Local Average of Wavelet Coefficients

引用

IEEE TRANSACTIONS ON IMAGE PROCESSING 2011年第8期20卷 2153-2165页

作者： Auli-Llinas, Francesc Univ Autonoma Barcelona Dept Informat & Commun Engn Bellaterra 08193 Spain

This paper introduces a probability model for symbols emitted by bitplane image coding engines, which is conceived from a precise characterization of the signal produced by a wavelet transform. Main insights behind the proposed model are the estimation of the magnitude of wavelet coefficients as the arithmetic mean of its neighbors' magnitude (the so-called local average), and the assumption that emitted bits are under-complete representations of the underlying signal. The local average-based probability model is introduced in the framework of JPEG2000. While the resulting system is not JPEG2000 compatible, it preserves all features of the standard. Practical benefits of our model are enhanced coding efficiency, more opportunities for parallelism, and improved spatial scalability.

关键词： bitplane coding context-adaptive coding JPEG2000

来源：评论

学校读者我要写书评

暂无评论

bitplane-by-bitplane shift (BbBShift) - A suggestion for JPEG2000 region of interest image coding

引用

IEEE SIGNAL PROCESSING LETTERS 2002年第5期9卷 160-162页

作者： Wang, Z Bovik, AC Univ Texas Dept Elect & Comp Engn Lab Image & Video Engn Austin TX 78712 USA

The JPEG2000 image coding standard defines two kinds of region of interest (ROI) coding methods-the general scaling based method and the maximum shift (maxshift) method. The former requires shape coding of the ROIs, which leads to increased complexity of codec implementations and limits the choice of ROI shapes (currently, only rectangle and ellipse shapes are defined). The latter allows for arbitrarily shaped ROI coding without explicitly transmitting any shape information to the decoder, but does not have the flexibility to select an arbitrary scaling value to define the relative importance of the ROI and the background wavelet coefficients. We propose a bitplane-by-bitplane shift (BbBShift) method, which supports both arbitrary ROI shape and arbitrary scaling without shape coding.

关键词： image coding JPEG2000 region of interest (ROI) bitplane coding wavelet coding maximum shift (maxshift) bitplane-by-bitplane shift (BbBShift)

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：