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Merge pull request #26260 from sturkmen72:upd_doc_4_x
Update Documentation #26260 ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [ ] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMakepull/22704/head^2
Suleyman TURKMEN
1 month ago
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GitHub
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16 changed files with 139 additions and 325 deletions
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/*
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* filestorage_sample demonstrate the usage of the opencv serialization functionality |
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*/ |
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#include "opencv2/core.hpp" |
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#include <iostream> |
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#include <string> |
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using std::string; |
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using std::cout; |
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using std::endl; |
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using std::cerr; |
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using std::ostream; |
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using namespace cv; |
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static void help(char** av) |
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{ |
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cout << "\nfilestorage_sample demonstrate the usage of the opencv serialization functionality.\n" |
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<< "usage:\n" |
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<< av[0] << " outputfile.yml.gz\n" |
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<< "\n outputfile above can have many different extensions, see below." |
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<< "\nThis program demonstrates the use of FileStorage for serialization, that is in use << and >> in OpenCV\n" |
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<< "For example, how to create a class and have it serialize, but also how to use it to read and write matrices.\n" |
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<< "FileStorage allows you to serialize to various formats specified by the file end type." |
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<< "\nYou should try using different file extensions.(e.g. yaml yml xml xml.gz yaml.gz etc...)\n" << endl; |
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} |
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struct MyData |
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{ |
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MyData() : |
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A(0), X(0), id() |
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{ |
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} |
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explicit MyData(int) : |
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A(97), X(CV_PI), id("mydata1234") |
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{ |
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} |
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int A; |
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double X; |
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string id; |
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void write(FileStorage& fs) const //Write serialization for this class
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{ |
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fs << "{" << "A" << A << "X" << X << "id" << id << "}"; |
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} |
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void read(const FileNode& node) //Read serialization for this class
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{ |
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A = (int)node["A"]; |
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X = (double)node["X"]; |
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id = (string)node["id"]; |
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} |
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}; |
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//These write and read functions must exist as per the inline functions in operations.hpp
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static void write(FileStorage& fs, const std::string&, const MyData& x){ |
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x.write(fs); |
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} |
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static void read(const FileNode& node, MyData& x, const MyData& default_value = MyData()){ |
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if(node.empty()) |
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x = default_value; |
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else |
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x.read(node); |
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} |
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static ostream& operator<<(ostream& out, const MyData& m){ |
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out << "{ id = " << m.id << ", "; |
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out << "X = " << m.X << ", "; |
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out << "A = " << m.A << "}"; |
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return out; |
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} |
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int main(int ac, char** av) |
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{ |
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cv::CommandLineParser parser(ac, av, |
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"{@input||}{help h ||}" |
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); |
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if (parser.has("help")) |
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{ |
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help(av); |
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return 0; |
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} |
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string filename = parser.get<string>("@input"); |
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if (filename.empty()) |
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{ |
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help(av); |
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return 1; |
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} |
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//write
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{ |
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FileStorage fs(filename, FileStorage::WRITE); |
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cout << "writing images\n"; |
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fs << "images" << "["; |
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fs << "image1.jpg" << "myfi.png" << "baboon.jpg"; |
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cout << "image1.jpg" << " myfi.png" << " baboon.jpg" << endl; |
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fs << "]"; |
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cout << "writing mats\n"; |
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Mat R =Mat_<double>::eye(3, 3),T = Mat_<double>::zeros(3, 1); |
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cout << "R = " << R << "\n"; |
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cout << "T = " << T << "\n"; |
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fs << "R" << R; |
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fs << "T" << T; |
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cout << "writing MyData struct\n"; |
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MyData m(1); |
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fs << "mdata" << m; |
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cout << m << endl; |
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} |
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//read
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{ |
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FileStorage fs(filename, FileStorage::READ); |
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if (!fs.isOpened()) |
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{ |
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cerr << "failed to open " << filename << endl; |
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help(av); |
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return 1; |
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} |
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FileNode n = fs["images"]; |
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if (n.type() != FileNode::SEQ) |
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{ |
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cerr << "images is not a sequence! FAIL" << endl; |
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return 1; |
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} |
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cout << "reading images\n"; |
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FileNodeIterator it = n.begin(), it_end = n.end(); |
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for (; it != it_end; ++it) |
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{ |
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cout << (string)*it << "\n"; |
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} |
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Mat R, T; |
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cout << "reading R and T" << endl; |
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fs["R"] >> R; |
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fs["T"] >> T; |
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cout << "R = " << R << "\n"; |
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cout << "T = " << T << endl; |
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MyData m; |
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fs["mdata"] >> m; |
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cout << "read mdata\n"; |
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cout << m << endl; |
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cout << "attempting to read mdata_b\n"; //Show default behavior for empty matrix
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fs["mdata_b"] >> m; |
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cout << "read mdata_b\n"; |
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cout << m << endl; |
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} |
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cout << "Try opening " << filename << " to see the serialized data." << endl << endl; |
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//read from string
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{ |
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cout << "Read data from string\n"; |
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string dataString = |
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"%YAML:1.0\n" |
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"mdata:\n" |
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" A: 97\n" |
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" X: 3.1415926535897931e+00\n" |
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" id: mydata1234\n"; |
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MyData m; |
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FileStorage fs(dataString, FileStorage::READ | FileStorage::MEMORY); |
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cout << "attempting to read mdata_b from string\n"; //Show default behavior for empty matrix
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fs["mdata"] >> m; |
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cout << "read mdata\n"; |
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cout << m << endl; |
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} |
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//write to string
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{ |
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cout << "Write data to string\n"; |
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FileStorage fs(filename, FileStorage::WRITE | FileStorage::MEMORY | FileStorage::FORMAT_YAML); |
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cout << "writing MyData struct\n"; |
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MyData m(1); |
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fs << "mdata" << m; |
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cout << m << endl; |
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string createdString = fs.releaseAndGetString(); |
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cout << "Created string:\n" << createdString << "\n"; |
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} |
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return 0; |
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} |
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