一、对于二值图,0代表黑色,255代表白色。去除小连通区域与孔洞,小连通区域用8邻域,孔洞用4邻域。
函数名字为:void RemoveSmallRegion(Mat &Src, Mat &Dst,int AreaLimit, int CheckMode, int NeihborMode)
CheckMode: 0代表去除黑区域,1代表去除白区域; NeihborMode:0代表4邻域,1代表8邻域;
如果去除小连通区域CheckMode=1,NeihborMode=1去除孔洞CheckMode=0,NeihborMode=0
记录每个像素点检验状态的标签,0代表未检查,1代表正在检查,2代表检查不合格(需要反转颜色),3代表检查合格或不需检查 。
1.先对整个图像扫描,如果是去除小连通区域,则将黑色的背景图作为合格,像素值标记为3,如果是去除孔洞,则将白色的色素点作为合格,像素值标记为3。
2.扫面整个图像,对图像进行处理。
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void RemoveSmallRegion(Mat &Src, Mat &Dst, int AreaLimit, int CheckMode, int NeihborMode)
{
int RemoveCount = 0 ;
/ / 新建一幅标签图像初始化为 0 像素点,为了记录每个像素点检验状态的标签, 0 代表未检查, 1 代表正在检查, 2 代表检查不合格(需要反转颜色), 3 代表检查合格或不需检查
/ / 初始化的图像全部为 0 ,未检查
Mat PointLabel = Mat::zeros(Src.size(), CV_8UC1);
if (CheckMode = = 1 ) / / 去除小连通区域的白色点
{
cout << "去除小连通域." ;
for ( int i = 0 ; i < Src.rows; i + + )
{
for ( int j = 0 ; j < Src.cols; j + + )
{
if (Src.at<uchar>(i, j) < 10 )
{
PointLabel.at<uchar>(i, j) = 3 ; / / 将背景黑色点标记为合格,像素为 3
}
}
}
}
else / / 去除孔洞,黑色点像素
{
cout << "去除孔洞" ;
for ( int i = 0 ; i < Src.rows; i + + )
{
for ( int j = 0 ; j < Src.cols; j + + )
{
if (Src.at<uchar>(i, j) > 10 )
{
PointLabel.at<uchar>(i, j) = 3 ; / / 如果原图是白色区域,标记为合格,像素为 3
}
}
}
}
vector<Point2i>NeihborPos; / / 将邻域压进容器
NeihborPos.push_back(Point2i( - 1 , 0 ));
NeihborPos.push_back(Point2i( 1 , 0 ));
NeihborPos.push_back(Point2i( 0 , - 1 ));
NeihborPos.push_back(Point2i( 0 , 1 ));
if (NeihborMode = = 1 )
{
cout << "Neighbor mode: 8邻域." << endl;
NeihborPos.push_back(Point2i( - 1 , - 1 ));
NeihborPos.push_back(Point2i( - 1 , 1 ));
NeihborPos.push_back(Point2i( 1 , - 1 ));
NeihborPos.push_back(Point2i( 1 , 1 ));
}
else cout << "Neighbor mode: 4邻域." << endl;
int NeihborCount = 4 + 4 * NeihborMode;
int CurrX = 0 , CurrY = 0 ;
/ / 开始检测
for ( int i = 0 ; i < Src.rows; i + + )
{
for ( int j = 0 ; j < Src.cols; j + + )
{
if (PointLabel.at<uchar>(i, j) = = 0 ) / / 标签图像像素点为 0 ,表示还未检查的不合格点
{ / / 开始检查
vector<Point2i>GrowBuffer; / / 记录检查像素点的个数
GrowBuffer.push_back(Point2i(j, i));
PointLabel.at<uchar>(i, j) = 1 ; / / 标记为正在检查
int CheckResult = 0 ;
for ( int z = 0 ; z < GrowBuffer.size(); z + + )
{
for ( int q = 0 ; q < NeihborCount; q + + )
{
CurrX = GrowBuffer.at(z).x + NeihborPos.at(q).x;
CurrY = GrowBuffer.at(z).y + NeihborPos.at(q).y;
if (CurrX > = 0 && CurrX<Src.cols&&CurrY > = 0 && CurrY<Src.rows) / / 防止越界
{
if (PointLabel.at<uchar>(CurrY, CurrX) = = 0 )
{
GrowBuffer.push_back(Point2i(CurrX, CurrY)); / / 邻域点加入 buffer
PointLabel.at<uchar>(CurrY, CurrX) = 1 ; / / 更新邻域点的检查标签,避免重复检查
}
}
}
}
if (GrowBuffer.size()>AreaLimit) / / 判断结果(是否超出限定的大小), 1 为未超出, 2 为超出
CheckResult = 2 ;
else
{
CheckResult = 1 ;
RemoveCount + + ; / / 记录有多少区域被去除
}
for ( int z = 0 ; z < GrowBuffer.size(); z + + )
{
CurrX = GrowBuffer.at(z).x;
CurrY = GrowBuffer.at(z).y;
PointLabel.at<uchar>(CurrY,CurrX) + = CheckResult; / / 标记不合格的像素点,像素值为 2
}
/ / * * * * * * * * 结束该点处的检查 * * * * * * * * * *
}
}
}
CheckMode = 255 * ( 1 - CheckMode);
/ / 开始反转面积过小的区域
for ( int i = 0 ; i < Src.rows; + + i)
{
for ( int j = 0 ; j < Src.cols; + + j)
{
if (PointLabel.at<uchar>(i,j) = = 2 )
{
Dst.at<uchar>(i, j) = CheckMode;
}
else if (PointLabel.at<uchar>(i, j) = = 3 )
{
Dst.at<uchar>(i, j) = Src.at<uchar>(i, j);
}
}
}
cout << RemoveCount << " objects removed." << endl;
}
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调用函数:dst是原来的二值图。
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Mat erzhi1 = Mat::zeros(srcImage.rows, srcImage.cols, CV_8UC1);
RemoveSmallRegion(dst, erzhi, 100 , 1 , 1 );
RemoveSmallRegion(erzhi, erzhi, 100 , 0 , 0 );
imshow( "erzhi1" , erzhi);
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和之前的图像相比
以上这篇OPENCV去除小连通区域,去除孔洞的实例讲解就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/dajiyi1998/article/details/60601410