The algorithm introduced in this paper provides prospective psnr performance that is close to the fsbma . the algorithm tries to achieve better performance in terms of all three parameters in the speed - quality - bitrate tradeoff , so satisfies high estimation performance and efficient implementation and can be used for real time low bit - rate video coding 这种运动估计方法性能上接近全搜索法和三步法，有较快的估计速度和较高的峰值信噪比，搜索效率高，在减少计算量的同时，保持较好的图像性能，因而是一种性能良好的运动估计方法。
In improved uep scheme , the syntax elements belonged to luminance parts and chrominance parts was reassigned to different data partitions . those packets containing syntax elements belonged to luminance parts were got error protection at high level so as to guarantee their correctness during transmitting in error - prone network . simulation has shown that using proposed scheme , the packing tradeoff is decreased 8240 bytes in error - free channel and also the output bits and bit rate of coded video stream are decreased 2 . 70kbits and 0 . 33 kbps respectively 仿真实验表明，本方案能在无噪信道中有效降低编码器端8240字节的打包开销和2 . 70kbit的输出比特数以及0 . 33kbps的比特率，而在有噪信道中可使解码输出重构视频图像的视觉质量得到一定程度的提高，亮度分量峰值信噪比可增加近1db 。
The taboo - search algorithm and the ordinary genetic algorithm are combined in this paper and the new algorithm is named taboo - genetic algorithm . the new algorithm is applied into the matching search of domain and range in fractal image coding . the result shows that the coding time is decreased greatly when the compression ration and the peak signal and noise ration do not decline 后来把禁忌搜索算法与简单遗传算法相结合，提出了一种新的禁忌搜索遗传算法，并应用于分形图像压缩编码的定义域、值域匹配搜索，从而在不降低峰值信噪比和压缩比的情况下极大地改善了分形图像压缩编码的速度。
Several evaluation criteria of information entropy , across entropy , psnr , average square difference and definition are presented in this dissertation . using these evaluation criteria , we study that different fusion rules influence the image fusion performance . these evaluation criteria are also applied to compare the performance of various image fusion methods 定量的评价图像融合性能是一项重要而复杂的工作，建立了信息熵、交叉熵、峰值信噪比、均方差以及清晰度这几种评价方法和准则，利用这些评价准则，研究不同的融合规则对融合性能的影响，还利用这些评价规则对多种图像融合方法的性能进行了比较研究。
According to this , we propose a new way to renew the traditional method of subjective image quality evaluation , different to only use mse ( mean square error ) and psnr ( peak signal - to - noise ratio ) to evaluate merely on radiation distortion , and complemented quantitative description on compressed image distortion o it is significant to choose the format of video transferation and measuring precision calculation of tracking and measuring systems based on images 中国科学院长春光机与物理研究所博士学位论文据此提出了不同于传统的仅用均方误差( mse )和峰值信噪比( psnr )来评价图像灰度辐射畸变的新思路，补充了对压缩图像几何畸变的定量描述。这对于基于图像的测量跟踪系统中数字图像传输方式的选择，以及评价压缩解压算法对测量精度的影响有重要意义。
The main contributions of this thesis are as follows : generalized gaussian distribution ( ggd ) is a nice model for the dct coefficients and wavelet coefficients in theory and practice . with information and quantization theory , we mathematically prove that the derivative of ggd distortion - rate function exists and is not related to the variance of the distribution 本文通过信息论和量化理论的知识,分析了广义高斯分布ggd率失真函数的基本属性,数学上严格证明了:以峰值信噪比psnr ( peaksignalnoiseratio )或信噪比snr为失真标准,广义高斯分布ggd的失真速率函数( distortion - ratefunction )的导数存在,并且与分布的方差无关。
The columns and rows are constrained by each other . the simulations over binary symmetric channe ( lbsc ) and gilbert - elliott channel ( gec ) shows the performance is great improved , especially over burst error channel peak signal to noise ratio ( psnr ) is improved more . it is tried to be used in wireless communication system 仿真结果表明,采用行列交替约束的约束维特比译码以后,性能得到较大的提升,尤其在突发错误信道中,传输的图像经乘积编码进行信道编码与译码后峰值信噪比有明显的提高。
