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本文小编为大家详细介绍“OpenCV连通域数量统计实例分析”,内容详细,步骤清晰,细节处理妥当,希望这篇“OpenCV连通域数量统计实例分析”文章能帮助大家解决疑惑,下面跟着小编的思路慢慢深入,一起来学习新知识吧。
/* Input: src: 待检测连通域的二值化图像 Output: dst: 标记后的图像 featherList: 连通域特征的清单(可自行查阅文档) return: 连通域数量。 */ int connectionDetect(Mat &src, Mat &dst, vector<Feather> &featherList) { int rows = src.rows; int cols = src.cols; int labelValue = 0; Point seed, neighbor; stack<Point> pointStack; // 用于计算连通域的面积 int area = 0; // 连通域的左边界,即外接最小矩形的左边框,横坐标值,依此类推 int leftBoundary = 0; int rightBoundary = 0; int topBoundary = 0; int bottomBoundary = 0; // 外接矩形框 Rect box; Feather feather; vector<stack<Point>> points; featherList.clear(); dst.release(); dst = src.clone(); for (int i = 0; i < rows; i++) { uchar *pRow = dst.ptr<uchar>(i); for (int j = 0; j < cols; j++) { if (pRow[j] == 255) { area = 0; // labelValue最大为254,最小为1. labelValue++; // Point(横坐标,纵坐标) seed = Point(j, i); dst.at<uchar>(seed) = labelValue; pointStack.push(seed); area++; leftBoundary = seed.x; rightBoundary = seed.x; topBoundary = seed.y; bottomBoundary = seed.y; while (!pointStack.empty()) { neighbor = Point(seed.x + 1, seed.y); if ((seed.x != (cols - 1)) && (dst.at<uchar>(neighbor) == 255)) { dst.at<uchar>(neighbor) = labelValue; pointStack.push(neighbor); area++; if (rightBoundary < neighbor.x) rightBoundary = neighbor.x; } neighbor = Point(seed.x, seed.y + 1); if ((seed.y != (rows - 1)) && (dst.at<uchar>(neighbor) == 255)) { dst.at<uchar>(neighbor) = labelValue; pointStack.push(neighbor); area++; if (bottomBoundary < neighbor.y) bottomBoundary = neighbor.y; } neighbor = Point(seed.x - 1, seed.y); if ((seed.x != 0) && (dst.at<uchar>(neighbor) == 255)) { dst.at<uchar>(neighbor) = labelValue; pointStack.push(neighbor); area++; if (leftBoundary > neighbor.x) leftBoundary = neighbor.x; } neighbor = Point(seed.x, seed.y - 1); if ((seed.y != 0) && (dst.at<uchar>(neighbor) == 255)) { dst.at<uchar>(neighbor) = labelValue; pointStack.push(neighbor); area++; if (topBoundary > neighbor.y) topBoundary = neighbor.y; } seed = pointStack.top(); pointStack.pop(); } box = Rect(leftBoundary, topBoundary, rightBoundary - leftBoundary, bottomBoundary - topBoundary); feather.area = area; feather.boundingbox = box; feather.label = labelValue; featherList.push_back(feather); } } } return labelValue; }
<font color=#999AAA >在此不进行实例演示
1、 输入图像为分割后图像
2、 执行结果可根据featherList信息自行绘制矩形框
<hr style=" border:solid; width:100px; height:1px;" color=#000000 size=1">
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