基于小波分析的噪声抑制和数据压缩综合技术——SAR图像的噪声抑制与数据压缩

本文给出了一种基于小波分析方法的噪声抑制技术,它具有运算简便和能在保持原图精度的同时有效地降低斑点噪声影响的优点。更重要的是,它将噪声抑制与数据压缩过程同时进行,对ＳＡＲ雷达图像的处理取得了良好的效果。     

卫星图像的格矢量量化编码压缩方法研究

卫星图像是一个种高熵值图像,本文针对卫星图像研究了格矢量量化编码压缩方法,分析了格矢量量化特性,并列举了几种格。实验结果表明,格矢量量化编码压缩方法失真小,计算量少,比较适用于卫星图像编码压缩。     

基于网结构压缩技术的Petri网监控器综合

针对Petri网控制问题中不可控子网的状态空间指数级增长导致的计算复杂性难题,提出了控制目标（线性约束）等价的网结构压缩算法：（1）将不可控子网部分区域压缩为单个库所;（2）并将原网上的线性约束等价转换为新网的新线性约束.反复迭代该算法,可以有效地压缩原不可控子网,从而指数级地减小不可控子网的状态空间,有效地降低监控问题的计算复杂性,甚至当不可控子网为状态机时,该方法能够彻底解决上述计算复杂性难题,获得高效最优的Petri网监控器,并用一个物料运输系统演示了该方法.     

Algorithmic compression of empirical data: reply to Twardy, Gardner, and Dowe

This discussion note responds to objections by Twardy, Gardner, and Dowe to my earlier claim that empirical data sets are algorithmically incompressible. Twardy, Gardner, and Dowe hold that many empirical data sets are compressible by Minimum Message Length technique and offer this as evidence that these data sets are algorithmically compressible. I reply that the compression achieved by Minimum Message Length technique is different from algorithmic compression. I conclude that Twardy, Gardner, and Dowe fail to establish that empirical data sets are algorithmically compressible.     

透水模板布几何参数对透排水性能的影响

为研究透水模板布(controlled permeability formwork liner,CPEL)透排水性能的影响因素,采用吸力平板仪、厚度测试仪等测试了不同压力下3种不同规格透水模板布的孔隙、厚度等几何参数.分析了孔隙累积分布曲线、孔隙率、压力及厚度的相互关系;结合CPFL水平和垂直渗透系数,深入探讨了CPFL孔隙分布、厚度和压力对透水模板布透排水性能的影响.并对交通运输部JT/T736-2009<混凝土工程用透水模板布>标准中厚度压缩比等指标提出了具体修改建议.研究表明:3种CPFL孔隙率和厚度均在32 kPa压力左右时趋于某一稳定值;CPFL透排水性能的内外部因素耦合作用明显.     

基于全局运动估计的高分辨率生物显微图像压缩算法

随着全自动生物显微镜的应用越来越广泛,高分辨率显微图像数据量大的问题越来越突出.为了对高分辨率显微图像进行更有效地压缩,针对全自动生物显微镜下图像步进式移动的特点,提出了基于全局运动估计的高分辨率生物显微图像压缩算法、利用H.264的帧内编码、全局运动矢量估计及运动补偿对图像进行压缩.实验结果表明,在图像质量满足观察需要的情况下,高分辨率生物显微图像的压缩比可以达到600倍以上.     

数字影像压缩技术的设计与实现

数字影像压缩一直是计算机图像图形领域的研究热点和攻关难点,针对影像压缩的具体要求,通过JPEG影像压缩算法和理论,实现了BMP影像文件从1到100范围内动态压缩成JPG影像文件.同时,对获取的JPG影像文件又可以还原解码成BMP影像文件.在设计与实现压缩的分析过程中,还对压缩后的影像质量作了比较,当压缩比例为50时,压缩影像质量良好,肉眼很难感知目标影像和压缩影像的差异.     

A NAM Representation Method for Data Compression of Binary Images

A representation method using the non-symmetry and anti-packing model (NAM) for data compression of binary images is presented.The NAM representation algorithm is compared with the popular linear quadtree and run length encoding algorithms.Theoretical and experimental results show that the algorithm has a higher compression ratio for both lossy and lossless cases of binary images and better reconstructed quality for the lossy case.     

Design of the signal processor for an ionospheric sounding system

On the basis of the analysis of the system sounding principle, this paper introduced a new type of ionospheric oblique backscattering sound system, which is based on the pseudo- random noise phase modulated pulse compression. According to the high requirements of real-time and a large amount of computation and echo characteristics, a high-speed real-time signal processing system was established and the design of system hardware and software was focused on. The sounding results indicate that the system is equipped to handle the data fast and has a high degree of software features. It is of great significance for the realization of fast, real-time ionospheric sounding means.      

一种以二值图像格式保存纯色信息的二值化简单彩色图像压缩方法

二值化简单彩色图像压缩方法通过颜色分离、二值化处理等操作,以二值图像格式高效率压缩保存包含有类似蓝色信笺头、红色公章、黑色图文等单纯颜色信息的影像文件,而且还原后能够原文原貌地恢复压缩前的图像和色彩内容,压缩效率比常用的8位以上彩色压缩方法提高8～10倍。二值化简单彩色图像压缩方法压缩7种以下单纯颜色图像文件的效果最为明显。