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Mat RegionGrow(Mat src, Point2i pt, int th) { Point2i ptGrowing; //待生长点位置 int nGrowLable = 0; //标记是否生长过 int nSrcValue = 0; //生长起点灰度值 int nCurValue = 0; //当前生长点灰度值 Mat matDst = Mat::zeros(src.size(), CV_8UC1); //创建一个空白区域，填充为黑色 //生长方向顺序数据 int DIR[8][2] = { { -1, -1 }, { 0, -1 }, { 1, -1 }, { 1, 0 }, { 1, 1 }, { 0, 1 }, { -1, 1 }, { -1, 0 } }; Vector<Point2i> vcGrowPt; //生长点栈 vcGrowPt.push_back(pt); //将生长点压入栈中 matDst.at<uchar>(pt.y, pt.x) = 255; //标记生长点 nSrcValue = src.at<uchar>(pt.y, pt.x); //记录生长点的灰度值 while (!vcGrowPt.empty()) //生长栈不为空则生长 { pt = vcGrowPt.back(); //取出一个生长点 vcGrowPt.pop_back(); //分别对八个方向上的点进行生长 for (int i = 0; i < 9; ++i) { ptGrowing.x = pt.x + DIR[i][0]; ptGrowing.y = pt.y + DIR[i][1]; //检查是否是边缘点 if (ptGrowing.x < 0 || ptGrowing.y < 0 || ptGrowing.x >(src.cols - 1) || (ptGrowing.y > src.rows - 1)) continue; nGrowLable = matDst.at<uchar>(ptGrowing.y, ptGrowing.x); //当前待生长点的灰度值 if (nGrowLable == 0) //如果标记点还没有被生长 { nCurValue = src.at<uchar>(ptGrowing.y, ptGrowing.x); if (abs(nSrcValue - nCurValue) < th) //在阈值范围内则生长 { matDst.at<uchar>(ptGrowing.y, ptGrowing.x) = 255; //标记为白色 vcGrowPt.push_back(ptGrowing); //将下一个生长点压入栈中 } } } } return matDst.clone(); } |
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