利用改进FLIC算法进行重力矢量场可视化  

Visualization of Gravity Vector Field Using Improved FLIC Algorithm

作　　者：李振海[1] 罗志才[1,2,3] 汪海洪[1,2] 李琼[1] 

机构地区：[1]武汉大学测绘学院,武汉市珞喻路129号430079 [2]武汉大学地球空间环境与大地测量教育部重点实验室,武汉市珞喻路129号430079 [3]武汉大学测绘遥感信息工程国家重点实验室,武汉市珞喻路129号430079

出　　处：《武汉大学学报（信息科学版）》2011年第3期276-279,379,共4页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40874002);国家973计划资助项目(2007CB714405);国家863计划资助项目(2008AA12Z105);国家教育部新世纪优秀人才支持计划资助项目(NCET-07-0635);地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(08-02-03)

摘　　要：针对固定滤波长度公式得到的LIC图像显示效果不理想的缺点,利用纹理流线上所有点亮度值的统计方差来衡量可视化精度,提出了一种滤波长度随矢量变化的改进FLIC算法。用颜色信息表示重力异常大小或者真实垂线偏差大小,纹理方向表示重力方向,基于改进FLIC算法实现了重力矢量场的可视化,结果表明,重力矢量场的可视化具有表达多维信息和矢量方向细节、图形直观易读等优势。In order to overcome the shortcomings of the traditional LIC algorithm with fixed filter length,an improved FLIC algorithm which filter length varied with the vector direction was proposed.And statistical variance of the intensities at all points in one texture streamline was employed to evaluate the visualization accuracy.The computational efficiency and visualization accuracy can be improved simultaneously by the new method.Furthermore,visualization of gravity vector field was carried out by improved FLIC algorithm,using color information to distinguish gravity anomalies or deflections of the vertical,and texture to express the direction of gravity vector.The results indicate that the visualization of gravity vector field has obvious advantages including multi-dimensional information expression,image cognition and vector direction details.

关 键 词：改进FLIC算法 重力矢量场 可视化 滤波长度 

分 类 号：P223.7[天文地球—大地测量学与测量工程]