使用OpenCV去除面积较小的连通域
这是后期补充的部分,和前期的代码不太一样
效果图
处理前后图
二,实现源代码
//=======函数实现===================================================================== 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 int a = 0;//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; } //=======函数实现===================================================================== //=======调用函数===================================================================== Mat img; img = imread("D:\\1_1.jpg", 0);//读取图片 threshold(img, img, 128, 255, CV_THRESH_BINARY_INV); imshow("去除前", img); Mat img1; RemoveSmallRegion(img, img, 200, 0, 1); imshow("去除后", img); waitKey(0); //=======调用函数=====================================================================
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