应用数字标识法识别地形图中黑块类符号

Recognizing the black block symbols in topographic map by numeric recognition method

采用数学形态学的方法对扫描图进行腐蚀和膨胀等处理,采用数字标识的方法,有效的记忆各像素点在处理过程中的变化规律;通过数字标识,快速滤掉无关要素,无损地恢复有关要素,达到高效识别出黑块类符号并自动提取符号图形信息的目的。

It is much difficult to digitize the black block symbols by hand work. In the paper, based on mathematical morphology, the rapidly and efficiently automatic recognition for the black blocks symbols in topographic maps is realized. On the one hand, scanned map is eroded and dilated. On the other hand, numerical value transformation is imposed in the image processing.