威特DI2002测距仪性能及其与ME－3000反射镜匹配研究

本文通过对威特ＤＩ２００２测距仪性能的测试。发现影响测距精度的主要因素是ＧＲＴ１０－ＧＰＨ１Ａ的反射镜系统。威特ＤＩ２００２测距仪匹配ＭＥ－３０００反射镜后，需加两项改正，但观测精度显著提高，实测表明达到与ＭＥ－３０００测距仪相同的精度。     

利用遥感影像进行变化检测

首先分析了利用影像进行变化检测的紧迫要求和存在的困难 ,接着对变化检测的方法进行分类 ,提出将影像配准与变化检测整体同步解求的思想和在此基础上进行三维变化检测的可能性 ,并在文中概要介绍和比较了各种变化检测的 7种方法 ,最后展望了下一步应继续研究的方向。     

A HYBRID THINNING ALGORITHM FOR BINARY TOPOGRAPHY MAP

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｔｈｉｎｎｉｎｇｏｆｂｉｎａｒｙｉｍａｇｅｓｉｓａｎｉｍｐｏｒｔａｎｔｔｅｃｈｎｏｌｏｇｙｉｎｉｍａｇｅｓｐｒｏｃｅｓｓｉｎｇ .Ｉｔｉｓｏｆｔｅｎｕｓｅｄｔｏｅｘｔｒａｃｔｔｈｅｓｋｅｌｅｔｏｎｓｏｆｂｉｎａｒｙｉｍａｇｅｓｆｏｒｒｅｃｏｇｎｉｚ ｉｎｇｂｉｎａｒｙｏｂｊｅｃｔｓ .Ｉｔｈａｓｂｅｅｎｗｉｄｅｌｙａｐｐｌｉｅｄｉｎｍａｐｄｉｇｉｔｉｚｉｎｇ ,ｃｈａｒａｃｔｅｒｓｒｅｃｏｇｎｉｔｉｏｎ ,ａｄｖａｎｃｅｄａｎａｌｙｓｉｓｏｆｉｍａｇｅｓａｎｄｓｏｏｎ .Ｔ…     

Surface Matching and Change Detection Using a Modified Hough Transformation for Robust Parameter Estimation

Many photogrammetric and GIS applications, such as city modelling, change detection and object recognition, deal with surfaces. Change detection involves looking for differences between two surface models that are obtained from different sensors, for example an optical sensor and a laser scanner, or by the same sensor at different epochs. Surfaces obtained through a sampling process may also have to be compared for future processing (for example transformation parameter estimation and change detection). Surface matching is therefore an essential task in these applications. The matching of surfaces involves two steps. The first step deals with finding the correspondences between two surface points and/or patches. The second step requires the determination of transformation parameters between the two surfaces. However, since most surfaces consist of randomly distributed discrete points and may have different reference systems, finding the correspondences cannot be achieved without knowing the transformation parameters between the two surfaces. Conversely, deriving the transformation parameters requires the knowledge of the correspondence between the two point sets. The suggested approach for surface matching deals with randomly distributed data sets without the need for error prone interpolation and requires no point-to-point correspondence between the two surfaces under consideration. This research simultaneously solves for the correspondence and the transformation parameters using a Modified Iterated Hough Transform for robust parameter estimation. Several experiments are conducted to prove the feasibility and the robustness of the suggested approach, even when a high percentage of change exists.     

基于线要素的图幅自动接边问题的探讨

文中介绍了基于线要素的图幅自动接边的基本算法 ,主要分 3步完成 :待拼接数据链的提取 ,属性匹配和图形拼接 ,给出了具体的实现过程 ,并应用某区的地貌数据进行了实际检验。同时还进一步探讨了交通信息管理中图幅之间道路要素的拓扑连接问题     

Enhancing group resolution of TM6 based on multi-variate regression model and semi-variogram function

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动态DEM匹配方法研究

在回顾现有制导技术之后,提出了一种新的导弹制导思想---利用动态DEM匹配方法实现导弹制导。在介绍这一思想及其实现步骤之后,文章着重介绍动态DEM匹配阶段中涉及的几个关键环节,即特征提取、特征描述、特征匹配、变换参数的解求以及相关匹配的改进等问题,最后,用实验验证了上述思想,得出结论,并为今后进一步研究提出了若干建议。     

一种基于小波分析的旋转不变图像快速匹配方法

提出了一种基于小波分解的具有旋转不变特性的三级特征图像快速匹配方法,利用小波分解的高频分量得到图像边缘,进而提取具有旋转不变特性的边缘特征;小波分解的低频分量则用于提取同样具有旋转不变性的图像尺度共生矩阵特征.前一个特征反映了图像边缘间的空间关系,后者则体现了图像灰度间的空间关系,利用这两类特征构成一个三级决策树对图像进行搜索,以查找搜索图中是否包含样本图,对满足匹配条件的若干候选子图,给出具有最大相似特性的一个,实验结果表明,较之于传统的模板匹配方法,该方法具有快速,高精度,抗干扰能力强等优点.     

多模板电子地图研究

着眼于电子地图的层次结构，提出了电子地图阅读特征化思想与方法；并借助电子地图多模板机制来实现地图动态可视化效果，满足了不同用户对电子地图的阅读要求。