map MAP =Military Aid Program 〔美国〕军事援助计划。 n. 1.地图;天体图;图。 2.〔美俚〕脸,面孔。 3.〔美俚〕(染色体上基因排列的)遗传图。 off the map 〔口语〕不重要的;消失的;过时的;陈腐的。 on the map 〔口语〕存在的;重要的;有名的,占显著地位的,起主要作用的。 put oneself on the map 发生,发现;使自己出名,出人头地。 put sb. [sth.] on the map 使某人[某事]出名。 wipe off the map 把…消灭掉。 vt. 1. 测绘,为…绘制地图;勘测,制订。 2.〔美俚〕测定(染色体中基因的)位置。 map out 规划,安排。
A method erasing noises on raster map based on extension character 基于外延特征的栅格地图噪声去除算法
The algorithm takes advantage of the merits of the watermarks both in low frequency and high frequency and can embed more information with less distortion . experimental results show the algorithm is robust to many common image operations . as for the vector map data , an uniform model of embeding watermark for vector maps and raster maps is proposed after current trend of research and watermarking methods of 3 - d vector images are summarized , primary study results show the model is effective and promising to further research 目前该问题在国内外都还处于探索阶段,作者在分析了国内外三维矢量水印的研究状况、研究方法后,提出了将矢量数据中的部分信息转化为栅格形式后再嵌入水印的方法,该方法使地图栅格数据和矢量数据在嵌入水印时能够使用统一模型,初步的实验结果表明该方法为二维地图矢量数据的水印嵌入开辟了一种新途径。