将关键点转换为mat或将它们保存到文本文件opencv [英] convert keypoints to mat or save them to text file opencv

问题描述

我已经提取了（opencv开源）中的SIFT功能，它们被提取为关键点。现在，我想将它们转换为矩阵（用他们的x，y坐标）或保存在一个文本文件...

I have extracted SIFT features in (opencv open source) and they are extracted as keypoints. Now, I would like to convert them to Matrix (With their x,y coordinates) or save them in a text file...

在这里，代码提取关键点，现在我想知道如何将它们转换为MAT或保存在txt，xml或yaml ...

Here, you can see a sample code for extracting the keypoints and now I would like to know how convert them to MAT or save them in txt, xml or yaml...

cv::SiftFeatureDetector detector;
std::vector<cv::KeyPoint> keypoints;
detector.detect(input, keypoints);

推荐答案

转换为cv :: Mat如下。 / p>

Convert to cv::Mat is as follows.

std::vector<cv::KeyPoint> keypoints;
std::vector<cv::Point2f> points;
std::vector<cv::KeyPoint>::iterator it;

for( it= keypoints.begin(); it!= keypoints.end();it++)
{
    points.push_back(it->pt);
}

cv::Mat pointmatrix(points);

写入filestorage是

Write to filestorage is

cv::FileStorage fs("test.yml", cv::FileStorage::WRITE);
cv::FileStorage fs2("test2.xml", cv::FileStorage::WRITE);

detector.write(fs);
detector.write(fs2);

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