Before finishing this chapter, we will explore the OpenCV functions to store and read our data. In many applications, such as calibration or machine learning, when we finish performing a number of calculations, we need to save these results to retrieve them in subsequent operations. OpenCV provides an XML/YAML persistence layer to this end.
Basic data persistence and storage
Writing to FileStorage
To write a file with some OpenCV or other numeric data, we can use the FileStorage class, using a streaming << operator such as STL streaming:
#include "opencv2/opencv.hpp"
using namespace cv;
int main(int, char** argv)
{
// create our writer
FileStorage fs("test.yml", FileStorage::WRITE);...