Advanced rle coding for weather radar data compression 改进游程编码在天气雷达数据压缩中的应用
Using the run - length coding method , implementing the synchronization of volume date - recording and laplace difference , the filter keeps a high real time capability 运用游程编码的思想作为树集设计逐行扫描的数据录入方法,使数据录入与拉普拉斯差分运葬同步进行,以保证高实时性。
Adaptive run length coding explores the residual redundancy of the high frequency coefficients in the transform domain . hereby , an embedded image coding algorithm based on binary description run length ( bdrl ) is brought forward 对高频子带采用自适应的游程编码处理,提出一种二进制描述游程的嵌入式图像编码算法( bdrl ) 。
Cormecting with spatial geographic information systems , image atttibute library is constructed by using distance squares reciprocal method , trend surface interpolation grouding on windows algorithm , and via series of processes 应用距离平方倒数法、基于窗口算法的趋势面插值,经数据游程编码、链码等一系列过程,与空间地理信息系统接口,建立了图像属性库。
Based on statistic property of all sub - bands coefficients , this paper gives a lossless image coding scheme including dpgm , huffman coding and run length coding . this scheme reduces the calculating complexity and works highly efficiently 针对图像整数小波分解后的各子带系数的统计特性,提出结合dpcm , huffman及游程编码的无损图像编码方法,该方法运算简洁,速度快,易于硬件实现。
The subimage of the lowest frequency ( ll4 ) is carried out lossless compressed coding ; 2 the subimages on diagonal direction of the highest frequency ( hhl ) is abandoned and is not carried out coding , because it is of great probability for zero , and it little affects visual 其主要包括对最低频子带单独进行无损压缩编码,对最高频对角线方向子带舍去不编码。对其余各子带根据视觉特点的不同,分别分配不同的比特数并按其进行零树量化,最后再游程编码。
Secondly , on the basis of the research on the characteristics of the wavelet coefficients , the combination of the ezw ( embedded zerotree wavelet ) and advanced rle ( run length encode ) is presented to realize the efficient codes of the wavelet coefficients . finally , the improved periodic extension algorithm is used to solve the boundary problem appeared in wavelet transform . the algorithm is realized by software and the good processing results are obtained 论文选取cdf ( 2 , 2 )小波基,取得了较好图像压缩效果;二、通过对小波系数的特点的研究,提出了将嵌入式零树编码和改进的游程编码相结合的方法,实现了小波系数的有效编码;三、采用改进的周期延拓法解决图像进行小波分解时出现的边界问题,并通过软件实现,取得较好的处理效果。
2 . reseach different methods and steps carried out including discrete cosine translation , run - length enconding and haffman encoding about signals coding and decoding . the signal - coding structure diagrams and programmable flow charts are not only established but also the applide program about signal coding and decoding is complied on vc developable flat 研究了信源编解码的各种方法(包括dct 、游程编码和哈夫曼编码等)以及实现的步骤,建立了信源编码实现的结构图和程序流程图,并在vc的开发平台下,编制了信源编解码实现过程的应用程序。