自已动手架设UBB讨论区

安装ＡＣＴＩＶＥ ＰＥＲＬ ｌ由于 ＵＬＴＩＭＡＴＥ ＢＨＬＬＥＴＩＮＢＯＡＲＤ ＭＭ．Ｍ＊ｕ ＣＧＩ撰写的讨论区程序,因此如果要在ＷＩＮＤＯＷＳ环境下执行,就必须安装ＰＥＲＬ执行程序。所以首先请到这里下载免费的ＡＣＴＩＶＥＰＥＲＬ程序：ＨＴＴＰ：／／ＷＷＷ．ＡＣＴＩＶＥＳＴＡＴＥ．ＣＯＭ／ＤＯＷＮ－ＬＯＡＤ／ＡＣＴＩＶＥＰＥＲＬ／ＷＩＮＤＯＷＳ／５．６／ＡＣＴＩＶＥＰＥＲＬ－５．６．０．６２３－ＭＳＷＩＮ３２－Ｘ８６－ＭＵＬＴＩ—ＴＨＲＥＡＤ．ＭＳＩ。 下载完后,请直接执行ＡＣＴＩＶＥＰＥＲＬ－５．…     

低码率视频编码中基于对角线抽样的混合DCT算法

该文提出了一个适用于低码率视频编码的基于对角线抽样（ＤＳ－Ｄｉａｇｏｎａｌｌｙ Ｓａｍｐｌｅｄ）的混合快速 ＤＣＴ编码方案,此方案包含一个新的 ３系数ＤＣＴ算法,同时提出了基于 ＤＳ的计算色度ＳＡＤ（Ｓｕｍ ｏｆ Ａｂｓｏｌｕｔｅ Ｄｉｆｆｅｒｅｎｃｅ）的方法用于有效准确地检测全零或３系数的色度块。这一混合算法可以有效的降低ＤＣＴ、ＩＤＣＴ、量化和反量化的运算量,提高编码器处理速度,而不会导致明显的图象质量的下降。     

Constructing M-sided Patches with NURBS

ＣＯＮＳＴＲＵＣＴＩＮＧＮ－ＳＩＤＥＤＰＡＴＣＨＥＳＷＩＴＨＮＵＲＢＳＷａｎｇＬａｚｈｕ；ＺｈｕＸｉｎｘｉｏｎｇＣＯＮＳＴＲＵＣＴＩＮＧＮ－ＳＩＤＥＤＰＡＴＣＨＥＳＷＩＴＨＮＵＲＢＳ￥ＷａｎｇＬａｚｈｕ；ＺｈｕＸｉｎｘｉｏｎｇＡｂｓｔｒａｃｔＴｈｅｐ...     

Windows95和NT下的网络游戏开发(下)

其中所有的参数都取自ＥｎｕｍＳｅｓ－ｓｉｏｎｓ,系统每收到一个回复的消息便调用一次ＥｎｕｍＳｅｓｓｉｏｎ,并在结构ＬＰＤＰＳＥ－ＳＳＩＯＮＤＥＳＣ中添入适当的值。以下是ＥｎｕｍＳｅｓｓｉｏｎｓＣａｌｌｂａｃｋ的程序实例。ＢＯＯＬＦＡＲＰＡＳＣＡＬＥｎｕｍｓｅｓｓｉｏｎ（ＬＰＤＰＳＥＳＳＩＯＮＤＥＳＣｌｐＤＰＧａｍｅＤｅｓｃ,ＬＰＶＯＩＤｌｐＣｏｎｔｅｘｔ,ＬＰＤＷＯＲＤｌｐｄｗＴｉｍｅｏｕｔ,ＤＷＯＲＤｄｗＦｌａｇｓ）｛ＬＯＮＧｉｌｎｄｅｘ：ＨＷＮＤｈｗｎｄ＝（ＨＷＮＤ）ｌｐＣｏｎ－ｔｅｘｔ;／…     

两分块K－循环Toeplitz矩阵相乘的快速算法

两分块Ｋ－循环Ｔｏｅｐｌｉｔｚ矩阵相乘的快速算法余品能（南京工程兵工程学院）ＡＦＡＳＴＡＬＧＯＲＩＴＨＭＦＯＲＣＯＭＰＵＴＩＮＧＴＨＥＰＲＯＤＵＣＴＳＯＦＢＬＯＣＫＫ－ＣＩＲＣＵＬＡＮＴＴＯＥＰＬＩＴＺＭＡＴＲＩＣＥＳ￥ＹｕＰｉｎｎｅｎｇ（Ｉｎｓｔｉ...     

SUN公司新闻集

ＳＵＮ公司新闻集ＳＵＮ宣布一种供电信业使用的开放性容错平台ｆｔ－ＳＰＡＲＣＴＭＳＵＮ公司近日宣布推出ｆｔ－ＳＰＡＲＣＴＭ容错平台，该平台具有连续可用性和满足遵循工业标准系统ＳＰＡＲＣＴＭ平齿还保持ＳｏｌａｒｉｓＴＭ应用软件可以不加修改的应用到ｆｔ－Ｓ...     

MPEG—4校验模型的研究与实现

本文主要是对ＭＰＥＧ－４校验模型（ＶＭ）关键技术进行研究,并实现了校验模型的编解码算法,主要包括形状、运动、纹理的压缩编码,在程序实现中形状编码采用基于内容的自述编码;运动编码在传统方法基础上做了改进;如半象素搜索、无限的运动失量、高级预测方式等;纹理编码主要还是用传统发ＤＣＴ、量化、变长编码码等,改进只是对帧内方式中ＤＣ、ＡＣ系数预测方法,现已实现了多个视频对象同时编码,解码时实现了ＭＰＥＧ－４     

对称坐标基的直接计算与对称分歧问题的约化求解

对称坐标基的直接计算与对称分歧问题的约化求解徐海洪（武汉大学数学系）ＤＩＲＥＣＴＣＯＭＰＵＴＡＴＩＯＮＯＰＳＹＭＭＥＴＲＹＭＯＤＥＳＡＮＤＲＥＤＵＣＴＩＯＮＯＦＢＩＦＵＲＣＡＴＩＯＮＰＲＯＢＬＥＭＳＷＩＴＨＳＹＭＭＥＴＲＹ￥ＸｕＨａｉ－ｈｏｎｇ（Ｄｅ...     

一类并行多步Runge－Kutta预校算法

一类并行多步Ｒｕｎｇｅ－Ｋｕｔｔａ预校算法李寿佛，甘四清（湘潭大学数学系）ＡＣＬＡＳＳＯＦＰＡＲＡＬＬＥＬＭＵＬＴＩＳＴＥＰＲＵＮＧＥ－ＫＵＴＴＡＰＲＥＤＩＣＴＯＲ－ＣＯＲＲＥＣＴＯＲＡＬＧＯＲＩＴＨＭＳ￥ＬｉＳｈｏｕ－ｆｏ；ＧａｎＳｉ－ｑｉｎｇ（Ｄ...     

A FEATURE－BASED PRODUCT MODELLING SYSTEM ON PC （CASE STUDY OF PARTS DESIGN FOR PRESS MACHINE）

ＡＦＥＡＴＵＲＥ－ＢＡＳＥＤＰＲＯＤＵＣＴＭＯＤＥＬＬＩＮＧＳＹＳＴＥＭＯＮＰＣ（ＣＡＳＥＳＴＵＤＹＯＦＰＡＲＴＳＤＥＳＩＧＮＦＯＲＰＲＥＳＳＭＡＣＨＩＮＥ）ＹｏｎａｓＨａｇｏｓ；ＴｏｎｇＢｉｎｇｓｈｕＡｂｓｔｒａｃｔ：Ｔｈｉｓａｒｔｉｃｌｅｒｅｐｏ...     

形状自适应变换在基于对象编码中的应用

形状自适应DCT(SA-DCT)在低码率时编码效果欠佳,且重建图像块效应明显。针对该问题,提出一种基于形状自适应全相位双正交变换(SA-APBT)的编码系统框架,采用APBT取代DCT进行编码。实验结果表明,该方法在低码率时的编码性能优于SA-DCT,且块效应明显减小。     

快速DCT域分形图像编码方法

分形图像压缩编码复杂度较高,而ＤＣＴ域的分形图像压缩方法虽然在性能上有所提高,但是对每个图像块的处理中又分别增加了一次二维ＤＣＴ,使得编码复杂度进一步提高,为降低ＤＣＴ域分形图像压缩的编码复杂度,引入平坦块的概念,对那些经过ＤＣＴ后,能量非常集中的块不做块匹配,而是直接编码输出。实验结果表明,与一般的ＤＣＴ域分形图像压缩方法相比,这种方法在提高编码速度的同时,也降低了比特率。     

基于边缘建模的纹理深度联合快速三维编码

HEVC的三维视频编码扩展部分（3D-HEVC）引入了视间预测和纹理深度联合预测的工具对相关性较强的纹理、深度视点进行高效编码,同时它沿用了HEVC中的四叉树编码结构和率失真优化来选择最优预测模式和块划分模式,这样导致计算量很大。在3D视频中,纹理图像、深度图像中存在大片较为平坦的纹理区域,深度图像中的平坦区域占比更是达到85%,然而对于平坦区域进行计算量极大的率失真过程是冗余的,针对此问题提出一种基于边缘建模的纹理深度联合快速编码算法。该方法对纹理图像以及深度图像进行边缘建模,对其中的编码单元进行平坦性分析,通过边缘模型中的平坦性和方向性对编码过程进行指导,从而有效地避免了一些冗余的CU深度以及块划分模式的遍历。实验结果表明,在随机访问配置（RA）的情况下,该方法平均降低59.0%的编码时间,而仅在合成视点端带来3.8%性能下降。     

基于自适应参考帧模式选择的多视点视频编码方法

基于多视点视频序列相关性,提出独立片的概念,进而提出一种采用自适应参考帧模式选择的多视点视频编码方法.在保证高率失真性能的前提下,应用独立片、自适应算法有效地降低了多视点视频编码计算复杂度,将多种性能进行有机结合,可以根据用户外部设置的参数调整自适应模式.实验结果表明,该方法在保证高压缩效率的前提下,能有效地降低计算复杂度,并改善随机访问性能.     

基于块运动信息的视频分割算法

提出一种视频对象分割的新算法.该算法利用块的运动信息作为分割依据,同时兼顾算法的计算复杂度和精度需求.一方面,对象分割的计算量开销与DCT运算相比可以忽略.另一方面,算法的分割精度能够满足提高无线视频编码传输质量的要求.实验验证该算法能有效提高无线视频应用的效率和鲁棒性.     

基于AVS1-P2的快速帧内预测算法

AVS1-P2标准参考软件rm52j的RDCost算法能很好地平衡视频编码质量和编码效率,但RDCost的计算复杂度大,占用了大量的编码时间。针对该问题,提出一种快速预测算法,利用帧内8×8亮度块亮度变化的方向性和邻块间预测模式的相关性进行帧内预测。实验证明,与全搜索算法相比,快速预测算法的编码时间平均节省了17%左右,且PSNR和比特率几乎不变。     

Network-driven low complexity coding for wireless multi-view video system

For wireless multi-view video system, which has very limited capability for storage and computation at the encoder, it is essential to design a video coding scheme with low complexity. Wyner-Ziv (WZ) coding scheme shifts large computational complexities to decoder with side information reconstruction, however, its encoding efficiency is not high enough. To obtain higher encoding efficiency and lower encoding complexity for wireless multi-view video applications, a network-driven low complexity video coding method is proposed in the paper. The proposed method is designed to implement color correction, motion vector extrapolation and disparity extraction at the central node of network, so as to reduce large computational complexities of motion estimation at the encoder and disparity estimation at the decoder. Experimental results show that encoding efficiency of the proposed method is higher than those of WZ coding and H.264 intraframe coding methods. The encoding complexity of the proposed method is greatly decreased and the decoded views are of color consistency, which is favorable to high quality view rendering at the decoder.     

Efficient algorithm for very low bit rate embedded image coding

The authors propose an embedded wavelet-based image coding algorithm that exploits both the inter- and intra-subband correlations among the wavelet coefficients. The proposed coding algorithm is based on spatial orientation trees (SOT) in which the basic unit is a block of m times n coefficients in contrast to a single coefficient in the set partitioning in hierarchical trees (SPIHT) algorithm. Each SOT has a root node (a block of m times n coefficients) in the LL-subband with the child and descendent blocks in the high frequency subbands. Thus it fuses the features of both block- and tree-based coding algorithms into a single algorithm. Performance of the proposed method is compared (in terms of rate-distortion performance) with the other state-of-the-art coding algorithms including the JPEG2000 for popular test images. Simulation results show that the proposed algorithm has a better coding efficiency over the other coders at very low bit rates. Also, compared with SPIHT it reduces the elements of the auxiliary lists, thereby reducing the memory requirements. In addition, the encoder of the proposed algorithm is significantly faster than that of the SPIHT, but with a slight increase in its decoder complexity.     

基于梯度的H.265/HEVC帧内预测硬件加速算法研究

HEVC即H.265,是目前最新的视频编码标准。相比于前一代视频编码标准,H.265/HEVC虽然能够明显改善视频压缩效率,但是却带来了更高的计算复杂度,尤其是在帧内预测过程中。为了解决这个问题,提出一种基于梯度的帧内预测硬件加速算法来跳过一些帧内预测模式和划分深度的预测过程,从而达到减少计算的目的。利用图像梯度信息来粗略估计编码单元的纹理方向和纹理复杂度,其中纹理方向用来估计编码单元的最优帧内预测方向,纹理复杂度用来判断是否跳过当前划分深度的预测编码过程。实验表明,相比于H.265/HEVC测试模型HM16.18,本文提出的算法能够减少6059%的编码时间,仅造成0.38 dB的BD PSNR减少和8.52%的BD-Rate增加。     

Optimization of depth modeling modes in 3D-HEVC depth intra coding

In the development of 3D video extension of high efficiency video coding (HEVC) standard, known as 3D-HEVC, depth modeling modes (DMMs) are introduced in depth intra coding to represent object edges in depth maps. With the DMMs, a depth block is approximated by partitioning the block into two non-rectangular regions using Wedgelet or Contour partition, where each region is represented by a constant value referred to as a constant partition value (CPV). To predict the CPV more accurately and efficiently, we develop three approaches in this study. First, a better CPV predictor may be obtained by simply extending the actual depth map boundary, which can also simplify the CPV prediction by removing comparisons and average operations. Second, we propose to choose an optimal combination of delta CPVs in terms of view synthesis optimization at the encoder by checking more candidates. Finally, zero residual coding is suggested for DMMs coding units in the rate-distortion optimization loop. Experimental results demonstrate that about 0.2 and 0.1 % Bjøntegaard delta rate saving can be achieved on average for synthesized views with less complexity, under the all-intra and random access configurations, respectively.