The Paper studied and concluded some general ways of scanned topographical map Image pretreatment.

本文首先对地形图扫描图像预处理常用的方法进行了研究和总结。

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In this paper, object-oriented approach is introduced into of segmentation scanned map. The procedure is described as follows. First, linear elements and area elements are separated.

借鉴面向对象的思想，提出了一种扫描地形图自动分层算法，算法先将地形图线划要素与普染区背景分离；

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This paper presents that the segmentation of color map can not be fulfilled only by using color after analyzing the color errors in the scanned data.

在研究了彩色地图扫描数据中客观存在的颜色误差后，根据彩色地图颜色的变化规律，提出了一种快速分层算法。

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