数字筛去除二值图像中斑点的方法

Removoing the Specks in a Binarized Image by Numeric Sieve

用 2 5 6级灰度扫描的工程图进行二值化后 ,会留下许多黑色斑点 ,在进行矢量化前必须把这些斑点除去。笔者根据筛子的原理 ,设计了一个数字筛 ,将它在图二值图上移动 ,小于网眼的黑斑用白色填充 ,连续的线条因无法从网格中掉下去而得以保留 。

There are many black specks in binarized images of engineering drawings scanned in 256 gray-levels,but these specks must be removed before vectoring of the drawings.Based on sieve principle,a numberic sieve is designed which may remove the specks in a binarized image by moving on it with filling white in the black specks smaller than the mesh of the sieve and remaining the curves unable to fall totally into the mesh.