As the real - time acquired and processing age , the researcher have developed the data compression method based on wavelet transform . but most of research only devote to the compression of the non - seismic data 随着实时采集处理时代的到来,研究人员从数学上发展了基于小波变换体系的数据压缩技术,但大多数的研究都是针对非地震数据的压缩。
Finally , a factual image compression method based on wavelet transform is offered . the main work is listed as follows : 1 ) in this part , the orthogonal daubechies wavelet bases from 1 to 4 are analyzed 本文所作主要工作具体如下: 1 )按照小波基的选取原则,通过对性能优良的daubechies的1到4阶正交小波基的验证,得到了实际的仿真结果数据。
Then , in the second chapter , we generalize the mathematical principle of fractal image compression . in the third chapter , we introduce jacquin ' s fractal image compres - sion method and fisher ' s self - adapted quadtree image compression method 第二章给出了分形压缩编码的数学原理和理论基础。第三章介绍了jacquin的分形压缩编码方法和fisher的自适应四叉树编码方法。
In comparison with the abilities of two fractal image compressions , the fractal image compression method based on region partition can gain higher compression ratio as the same of sign to noise rate , which compression ability is improved obviously 通过对两种分形压缩方法性能的比较,基于区域划分的分形图象压缩方法可以在相同的性噪比下达到更高的压缩比,压缩性能显著提高。
So the hyperspectral remote sensing images must be compressed in applications . the existed image compression standards are for ordinary two - dimension images . there is n ' t any authoritative compression method for hyperspectral remote sensing images 目前各种图像压缩标准和方法主要面向二维普通图像,而超光谱遥感图像作为三维立体图像,还没有成熟且适合实际应用的压缩方法。
So this paper focuses on the researching about data compression methods and storage architectures which are suitable for ssdb and corresponding query processing technology on them , including data operations and query optimizations 因此,本文的研究内容包括:研究适合于科学与统计数据库的数据压缩算法及存储结构;研究在压缩科学与统计数据库上的查询处理技术,包括数据操作算法和查询优化算法。
By using storage space with an given ip address and lossless image compression method , a teleimage reading system is realized sucessfully , especially the linkage of different imaing equipment with our system and the technique of downloading and uploading 最终提出了采用固定ip地址中间存储空间和恰当无损压缩以建立院间pacs系统的工作思路,进行利用ftp和公众网( adsl )技术实现了远程图片读片系统。
A low complexity remote sensing image compression method via lapped filtering based on spaced domain resampling named lfrc is proposed , which is characterized with high fidelity of the restored image and low computation complexity of the compression algorithm 结合空间重采样的方法( rbc ) ,提出一种基于重叠滤波的低复杂度遥感图像压缩方法( lfrc ) ,该方法的主要特点是恢复图像的高保真和压缩算法的低运算复杂度。
Its high resolution in range is fulfilled by using pulse compression method . its high resolution in azimuth is achieved by utilizing the doppler information among the signals received by sar at different locations . hence , the acquired image of the targets is of very high resolution 它采用距离向的脉冲压缩技术和方位向不同位置上接收到的脉冲间的多普勒信息来获得两维的高分辨率,从而得到高分辨率的目标图像。
Author segments an image and then makes the text layer as roi of document image , then he compresses and reconstructs its all layers according to its own characteristic . author expects to obtain a higher compression rate than general image compression methods 把分割出来的文本层作为兴趣域,插图层则相应的为非兴趣域,然后针对扫描文档图像本身的特性对各层进行压缩与解压缩,以求达到比通用图像压缩算法更高的压缩比。