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优化截断
相关语句
  optimized truncation
     The latest still image compression standard JPEG2000 adopts Discrete Wavelet Transform (DWT) and Embedded Block Coding with Optimized Truncation (EBCOT), which achieves much better coding efficiency and image quality than the traditional methods.
     最新静止图像压缩标准JPEG2000采用离散小波变换(DWT)和优化截断嵌入式块编码(EBCOT),在编码效率和复原图像质量上均远优于JPEG等传统算法,今后必将在静止图像压缩领域占据主导地位。
短句来源
     This work does a study and research on the core algorithm and architecture of JPEG2000, especially focus on the MQ coder of its core coder named Embedded Block Coding with Optimized Truncation (EBCOT).
     本文研究JPEG2000的核心算法和系统架构,尤其对其核心编码单元嵌入式优化截断块编码(Embedded Block Coding with Optimized Truncation, EBCOT)中的算术编码器——MQ编码器的算法做了较深入的分析研究。
短句来源
     JPEG 2000 is the new generation of compression standard for still image, which is based on EBCOT (Embedded Block Coding with Optimized Truncation).
     JPEG2000是新一代静止图像压缩编码标准,它是在EBCOT(优化截断嵌入式块编码)算法的基础上形成的。
短句来源
     Embedded zeroblock coding with optimized truncation
     优化截断点的嵌入零块编码算法
短句来源
  “优化截断”译为未确定词的双语例句
     Simulation demonstrates that,by means of mutual information criterion,wavelet denoise could distinguish between dynamical structure of signal and noise effectively.
     互信息所指示的优化截断尺度,既较好地保留了信号的动力结构,又有效地实现了非线性噪声过滤.
短句来源
  相似匹配句对
     Cut-optimized Mould
     截断切割优化模型
短句来源
     Using optimization principl
     优化;
短句来源
     Study on Optimized Model for Cutoff
     截断切割的优化模型
短句来源
     The main problem facing us now is to determine the aims and the ways of the optimization.
     如何优化 ?
短句来源
     The cutting problem
     截断切割
短句来源
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  optimized truncation
It remains all the features of Embedded Block Coding with Optimized Truncation (EBCOT) such as resolution progressive, good robust for error bit spread and compatibility of lossless compression.
      
The paper presents a new architecture composed of bit plane-parallel coder for Embedded Block Coding with Optimized Truncation (EBCOT) entropy encoder used in JPEG2000.
      
The image compression scheme under consideration is EBCOT (Embedded Block Coding with Optimized Truncation) which has been adopted in the verification model (VM) of the emerging JPEG-2000 image compression standard.
      
High-Speed and Low-Power IP for Embedded Block Coding with Optimized Truncation (EBCOT) Sub-Block in JPEG2000 System Implementat
      
Finally, the target output rate is met by the rate-distortion optimized truncation.
      


Recently, many variable size region wise motion estimation techniques have been proposed to replace the conventional constant size block motion estimation, improve the performance of video codec, particularly at very low bit rates. In these region wise motion estimation approaches, Lagrangian multiplier method was commonly adopted to optimize the bit allocation of motion vector field under the constraint of the target bit rate. However the high computation complexity prevents them from being applied in practices....

Recently, many variable size region wise motion estimation techniques have been proposed to replace the conventional constant size block motion estimation, improve the performance of video codec, particularly at very low bit rates. In these region wise motion estimation approaches, Lagrangian multiplier method was commonly adopted to optimize the bit allocation of motion vector field under the constraint of the target bit rate. However the high computation complexity prevents them from being applied in practices. On analyzing the nature of motion compensation prediction, this paper proposes a fast algorithm of optimizing bit allocation for the quadtree structured motion vectors (MV) field based on the minimum entropy criterion, according to which the quadtree structured leaf MVs will be pruned if and only if the increased entropy of MVs is greater than the associated decreased entropy of compensation frame difference (CFD),otherwise, will replace the corresponding root MV. By adaptively pruning along the backward search path of the quadtree, the proposed fast algorithm reaches a globally optimal solution to this problem. Through assuming a prior distribution, a closed format of the theoretical entropy of CFD is presented. Considering the lossy nature of video coding, a modified scheme to the theoretical entropy of CFD is also described, in which theoretical entropy of CFD for each sub block is multiplied by a suitable weighting factor according to its position in the quadtree. To capture the high correlation among MVs, a merging approach of MVs is simultaneously described, in which the MV with minimum norm will be lifted to its parent node position and coded with higher priority. Simulation experiments on a motion compensated three dimensional wavelet video codec show that the proposed optimally pruning algorithm is not only fast but also robust. It will yield an optimal bit allocation across MVs and CFD if a suitable searching depth is provided. Avoiding the concrete post processing of CFD, the proposed algorithm can also be applied to the conventional DCT based hybrid video codec.

从信息论的角度看 ,运动补偿的最终目的是极小化信源熵率 .因此 ,对具有四叉树结构的运动矢量场 ,当使用叶部运动矢量替代相应根部运动矢量作运动补偿预测时 ,若编码运动矢量所增加的熵大于相应补偿帧差所减少的熵 ,则删除相应的叶部运动矢量 ,反之 ,则应使用叶部运动矢量替代根部的运动矢量 .依据这一准则 ,该文通过对正向搜索的运动矢量场进行自下而上反向优化截断 ,得到了一个全局优化运动矢量场码率分配的快速算法 .通过假设补偿帧差系数的先验概率分布 ,该文首先给出了一个闭式补偿帧差系数熵理论计算公式 ,考虑到视频压缩的有损特性 ,然后又对这个闭式理论公式作了带权修正 .为了进一步提高运动矢量的编码效率 ,文中同时也给出了一种运动矢量融合方案 .最后 ,该文在运动补偿的三维小波视频编码系统上对这个算法进行了验证和比较 .模拟实验证实该文所提出的运动矢量码率分配算法不仅速度快而且收敛性态稳定 ,只要提供合适的搜索深度 ,总可以获得最佳的分配结果 .由于优化算法避开了补偿帧差的具体后处理 ,因此该文的算法也可以应用到传统的 DCT视频编码器

Two VLSI architectures were developed for JPEG2000 encoder IP design, the discrete wavelet transform (DWT) and the embedded block coding with optimized truncation (EBCOT) for JPEG2000. The DWT design is based on the spatial combinative lifting algorithm (SCLA) with a 9/7 filter, which requires 7/12 of the computations in the conventional lifting algorithm. The EBCOT design uses parallel processing and dynamic memory control (DMC) architecture, which greatly speeds up the coding process and achieves higher...

Two VLSI architectures were developed for JPEG2000 encoder IP design, the discrete wavelet transform (DWT) and the embedded block coding with optimized truncation (EBCOT) for JPEG2000. The DWT design is based on the spatial combinative lifting algorithm (SCLA) with a 9/7 filter, which requires 7/12 of the computations in the conventional lifting algorithm. The EBCOT design uses parallel processing and dynamic memory control (DMC) architecture, which greatly speeds up the coding process and achieves higher hardware utilization. These two architectures can also be used as independent, efficient IP cores for various real time imaging applications, such as remote surveillances and digital still cameras.

为了进行符合新一代静止图像压缩标准 JPEG2 0 0 0的图像编码 IP核设计 ,提出了基于 JPEG2 0 0 0标准的离散小波变换器 (DWT)和优化截断的嵌入式分块编码器 (E-BCOT)的 VL SI结构。DWT采用的空间组合推举体制算法(SCL A)将基于 9/ 7滤波器的标准推举 (lifting)算法体制快速的运算量降低了 5 / 12。EBCOT采用的并行运算和动态内存控制 (DMC)结构 ,在保证编码速度的前提下 ,最大限度减小了片内小波系数缓存量和访问频率。这 2项设计均可以作为单独的 IP核应用在其他需要高速图像处理的领域 ,如远程监控、数码相机等。

With the broad application of the image coding algorithms to engineering, the researches on the memoryconstrained image coding algorithms have been paid more and more attention to. In this paper, an embedded image coding algorithm based on zeroblock, called Embedded ZeroBlock coding with Optimized Truncation (EZBOT), is presented. It operates the setpartition based on zeroblock, in which the independence between the zeroblocks ensures that the algorithm is effective under the memoryconstrained condition....

With the broad application of the image coding algorithms to engineering, the researches on the memoryconstrained image coding algorithms have been paid more and more attention to. In this paper, an embedded image coding algorithm based on zeroblock, called Embedded ZeroBlock coding with Optimized Truncation (EZBOT), is presented. It operates the setpartition based on zeroblock, in which the independence between the zeroblocks ensures that the algorithm is effective under the memoryconstrained condition. In order to improve the quality of the reconstructed image, we introduce an optimized truncation scheme to allocate the number of every subbitstreams bits. In this scheme, there is more than one truncation point available in every zeroblock, at which the value of the ratedistortion function can be computed. So, given the compression ratio, we can select the approximate optimized truncation point for every zeroblock according to the slope of the ratedistortion function at each truncation point. The experimental result shows that EZBOT is very effective under the memoryconstrained condition.

提出了一种基于零块的嵌入图像编码算法,称为优化截断点的嵌入零块编码算法,该算法以零块为单位进行集合分割,依靠零块间的独立性保证了算法在内存受限条件下的有效性,同时在各零块的比特分配中采用了优化截断的策略,使得每个零块可以近似最优地选择截断点.实验证明,优化截断点的嵌入零块编码算法是目前内存受限条件下非常有效的图像压缩算法之一.

 
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