QMap - 边缘检测与细化

本单元将图像单色化、边缘检测、细化处理等组合起来，形成快速有效的细化处理手段。这对于图像到图形的转换提供了一个一次性处理的好方法。给遥感图像到地理信息系统（GIS）的转换连接带来了方便。改变组合参数，可达到最佳处理效果。

现按软件功能界面介绍如下：

1. 选择图像
    在图像上点击鼠标右键，显示图像名在编辑框内。

2. 预处理为单色图像
    默认时为选中“预处理为单色图像”。在边缘检测与细化处理前，一般都将彩色图像转变为二值单色图像。彩色图像转二值图像时，阈值的选择决定最终的处理精度。
    默认的阈值为128，可手动改变，也可点击“获取单色阈值”按钮，得到选中图像的最佳阈值。

3. 边缘检测算法选择
    具体算法列出如下： 罗伯特、拉普拉斯4，拉普拉斯8、索贝尔、基尔希、平滑、右下、普雷维特、罗宾逊。

4. 红绿蓝通道选择
    当图像为彩色时，可屏蔽某通道。被屏蔽通道有两种中选择，即选中“未选通道色置0”，将该通道的图像数据设置为0，相反，保持图像数据不变。

5. 线性细化处理
    细化处理的目的是将图形进行单连通处理，为图像中的点阵图形转化成矢量做准备。默认为选中“线性细化处理”。当处理完后，继续点击“处理”按钮，会循环处理该图像。点击“恢复原图”可恢复原始图像。

6. 保存与载入方案
    点击“保存方案”按钮，可将本单元中的参数保存到文件，需要时通过“载入方案”恢复处理中的参数。
    





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