opencv的XML文件读写
发布时间：2020-12-16 06:25:29 所属栏目：百科 来源：网络整理
导读：1. XML、YAML文件的打开和关闭 XMLYAML文件在OpenCV中的数据结构为FileStorage，打开操作例如： string filename = "test.xml"; FileStorage fs(filename,FileStorage::WRITE); 或者 fs.open(filename,sans-serif; font-size:15px; line-height:25px">//
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1. XML、YAML文件的打开和关闭 XMLYAML文件在OpenCV中的数据结构为FileStorage，打开操作例如：string filename = "test.xml"; FileStorage fs(filename,FileStorage::WRITE); 或者 fs.open(filename,sans-serif; font-size:15px; line-height:25px">// 文件读写模式 // file storage mode enum { READ=0,//! read mode WRITE=1,//! write mode APPEND=2 //! append mode }; 文件关闭操作会在FileStorage结构销毁时自动进行，但也可调用如下函数实现 fs.release(); 2.文本和数字的输入和输出 写入文件使用 << 运算符，例如： fs << "iterationNr" << 100; 读取文件，使用 >> 运算符，例如 int itNr; fs["iterationNr"] >> itNr; itNr = (int) fs["iterationNr"]; 3. OpenCV数据结构的输入和输出，和基本的C++形式相同 Mat R = Mat_<uchar >::eye (3,3), T = Mat_<double>::zeros(3,1); fs << "R" << R; // Write cv::Mat fs << "T" << T; fs["R"] >> R; // Read cv::Mat fs["T"] >> T; 4. vector（arrays） 和 maps的输入和输出 vector要注意在第一个元素前加上“[”，在最后一个元素前加上"]"。例如： fs << "strings" << "["; // text - string sequence fs << "image1.jpg" << "Awesomeness" << "baboon.jpg"; fs << "]"; // close sequence 对于map结构的操作使用的符号是"{"和"}"，例如： fs << "Mapping"; // text - mapping fs << "{" << "One" << 1; fs << "Two" << 2 << "}"; 读取这些结构的时候，会用到FileNode和FileNodeIterator数据结构。对FileStorage类的[]操作符会返回FileNode数据类型，对于一连串的node，可以使用FileNodeIterator结构，例如： FileNode n = fs["strings"]; // Read string sequence - Get node if (n.type() != FileNode::SEQ) { cerr << "strings is not a sequence! FAIL" << endl; return 1; } FileNodeIterator it = n.begin(),it_end = n.end(); // Go through the node for (; it != it_end; ++it) cout << (string)*it << endl; //！FileNode的类型 //! type of the file storage node enum NONE=0,//!< empty node INT=1,//!< an integer REAL=2,//!< floating-point number FLOAT=REAL,//!< synonym or REAL STR=3,//!< text string in UTF-8 encoding STRING=STR,//!< synonym for STR REF=4,//!< integer of size size_t. Typically used for storing complex dynamic structures where some elements reference the others SEQ=5,//!< sequence MAP=6,//!< mapping TYPE_MASK=7,sans-serif; font-size:15px; line-height:25px"> FLOW=8,//!< compact representation of a sequence or mapping. Used>// open file storage for writing. Type of the file is determined from the extension { FileStorage fs("test.xml",FileStorage::WRITE); fs << "test_int" << 5 << "test_real" << 3.1 << "test_string" << "ABCDEFGH"; fs << "test_mat" << Mat::eye(3,3,CV_32F); fs << "test_list" << "[" << 0.0000000000001 << 2 << CV_PI << -3435345 << "2-502 2-029 3egegeg" << "{:" << "month" << 12 << "day" << 31 << "year" << 1969 << "}" << "]"; fs << "test_map" << "{" << "x" << 1 << "y" << 2 << "width" << 100 << "height" << 200 << "lbp" << "[:"; const uchar arr[] = {0,1,1}; fs.writeRaw("u",arr,(int)(sizeof(arr)/sizeof(arr[0]))); fs << "]" << "}"; } // open file storage for reading. // Type of the file is determined from the content,not the extension int test_int = (int)fs["test_int"]; double test_real = (double)fs["test_real"]; string test_string = (string)fs["test_string"]; cout << "test_int " << test_int << " test_real " << test_real << " test_string " << test_string << endl; Mat M; fs["test_mat"] >> M; cout << "test_mat " << M << endl; FileNode tl = fs["test_list"]; CV_Assert(tl.type() == FileNode::SEQ && tl.size() == 6); double tl0 = (double)tl[0]; int tl1 = (int)tl[1]; double tl2 = (double)tl[2]; int tl3 = (int)tl[3]; string tl4 = (string)tl[4]; CV_Assert(tl[5].type() == FileNode::MAP && tl[5].size() == 3); int month = (int)tl[5]["month"]; int day = (int)tl[5]["day"]; int year = (int)tl[5]["year"]; cout << "test_list" << endl; cout << "tl0 " << tl0 << " tl1 " << tl1 << " tl2 " << tl2 << " tl3 " << tl3 << " tl4 " << tl4 << endl; cout << "tl5 " << " month " << month << " day " << day << " year " << year << endl; FileNode tm = fs["test_map"]; int x = (int)tm["x"]; int y = (int)tm["y"]; int width = (int)tm["width"]; int height = (int)tm["height"]; cout << "test_map " << " x " << x << " y " << y << " width " << width << " height " << height << endl; int lbp_val = 0; FileNodeIterator it = tm["lbp"].begin(); for(int k = 0; k < 8; k++,++it) lbp_val |= ((int)*it) << k; cout << "blp " << lbp_val << endl; return 0; ###################################################################### 6、XML文件 test.xml ########################################### <?xml version="1.0"?> <opencv_storage> <test_int>5</test_int> <test_real>3.1000000000000001e+00</test_real> <test_string>ABCDEFGH</test_string> <test_mat type_id="opencv-matrix"> <rows>3</rows> <cols>3</cols> <dt>f</dt> <data> 1. 0. 0. 0. 1. 0. 0. 0. 1.</data></test_mat> <test_list> 1.0000000000000000e-13 2 3.1415926535897931e+00 -3435345 "2-502 2-029 3egegeg" <_><month>12</month> <day>31</day> <year>1969</year></_></test_list> <test_map> <x>1</x> <y>2</y> <width>100</width> <height>200</height> <lbp> 0 1 1 0 1 1 0 1</lbp></test_map> </opencv_storage> ########################################## 7、YML文件 tet.yml 运行时需将Filename改为test.yml %YAML:1.0 test_int: 5 test_real: 3.1000000000000001e+00 test_string: ABCDEFGH test_mat: !!opencv-matrix rows: 3 cols: 3 dt: f data: [ 1.,0.,1.,1. ] test_list: - 1.0000000000000000e-13 - 2 - 3.1415926535897931e+00 - -3435345 - "2-502 2-029 3egegeg" - { month:12,day:31,year:1969 } test_map: x: 1 y: 2 width: 100 height: 200 lbp: [ 0,1 ] ######################################### 8、CMakeList.txt文件 ######################################## PROJECT(xml) CMAKE_MINIMUM_REQUIRED(VERSION 2.6) if(COMMAND cmake_policy) cmake_policy(SET CMP0003 NEW) endif(COMMAND cmake_policy) FIND_PACKAGE( OpenCV REQUIRED ) # Declare the target (an executable) ADD_EXECUTABLE(xml xml.cpp) TARGET_LINK_LIBRARIES(xml ${OpenCV_LIBS}) #MESSAGE(STATUS "OpenCV_LIBS: ${OpenCV_LIBS}") ################################################# 编译 执行： cd currentPath cmake -Unix make ./xml2 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |