c++ - OpenCV fileStorage XML格式——如何在一个文件中写入和读取多个相同类型的结构

Question

我正在尝试使用 OpenCV 库将多个值写入 XML 文件。

我正在尝试保存我在项目中使用的结构之一:

if (validCalib)
{ 
    QString calpath = path() + "/" + "calibration.xml"; 

    for (int i = 0; i < calibrations_.size(); ++i) 
    {
        QLOGX(" Writing calibration no. " << i); 
        calibrations_[i]->append(calpath.toStdString()); 
        xml.writeTextElement(XML_CALIBSTRUCT, calpath); 
    } 
} 

calibrations_[i]->append(calpath.toStdString()); 行是对以下代码的包装:

void Calibration3D::append(const std::string &path) const
{
LOGX("Storing calibration in: '" << path << "'");

cv::FileStorage fsCal(path, cv::FileStorage::APPEND);
fsCal << "imgSizeW" << imgSize_.width;
fsCal << "imgSizeH" << imgSize_.height;
fsCal << "error" << error_;

fsCal << "cam1M" << cam1_.camera_;
fsCal << "dist1M" << cam1_.distort_;
fsCal << "cam1Err" << cam1_.error_;
fsCal << "cam2M" << cam2_.camera_;
fsCal << "dist2M" << cam2_.distort_;
fsCal << "cam2Err" << cam2_.error_;

fsCal << "rot" << rot_;
fsCal << "trans" << trans_;
fsCal << "ess" << ess_;
fsCal << "fund" << fund_;
}

它生成以下文件:

<?xml version="1.0"?>
<opencv_storage>
<imgSizeW>1624</imgSizeW>
<imgSizeH>1232</imgSizeH>
<error>1.0434992866920401e-001</error>
<cam1M type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    5.8336770199129896e+003 0. 7.9461884987678354e+002 0.
    5.8346113022077216e+003 6.2767580661716852e+002 0. 0. 1.</data></cam1M>
<dist1M type_id="opencv-matrix">
  <rows>1</rows>
  <cols>5</cols>
  <dt>d</dt>
  <data>
    -4.1521842761754475e-002 -1.2257987732483255e+000
    1.8424136500047315e-003 -1.3132630808037672e-003 0.</data></dist1M>
<cam1Err>9.9465113482762754e-002</cam1Err>
<cam2M type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    5.8076598763871389e+003 0. 8.1187260416598792e+002 0.
    5.8094240172010641e+003 6.3986386929850755e+002 0. 0. 1.</data></cam2M>
<dist2M type_id="opencv-matrix">
  <rows>1</rows>
  <cols>5</cols>
  <dt>d</dt>
  <data>
    -9.2121454522962165e-002 1.8926990233429226e+000
    1.7827799056532767e-003 -5.5230657283086685e-004 0.</data></dist2M>
<cam2Err>1.0166116306730072e-001</cam2Err>
<rot type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    8.4241672981065119e-001 -5.8573511631213023e-003
    -5.3879471487058994e-001 1.0809897944575920e-002
    9.9992338290376193e-001 6.0311216804594652e-003
    5.3871810758647809e-001 -1.0905033683970737e-002
    8.4241550365528961e-001</data></rot>
<trans type_id="opencv-matrix">
  <rows>3</rows>
  <cols>1</cols>
  <dt>d</dt>
  <data>
    5.0365870692993354e+002 -5.1969545995371860e+000
    1.3064843970613484e+002</data></trans>
<ess type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    -4.2119898469169144e+000 -1.3058175683709450e+002
    -5.1659517636726635e+000 -1.6126963413464023e+002
    4.7271613740233587e+000 -4.9468259208850623e+002
    9.8225007195261931e+000 5.0358967767424525e+002
    2.3753527526426321e-001</data></ess>
<fund type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    2.7779018317104696e-008 8.6107808772984268e-007
    -3.6379467295147945e-004 1.0632864450905678e-006
    -3.1162232035265673e-008 1.8201493171578327e-002
    -1.0791410825328929e-003 -1.9964962350893754e-002 1.</data></fund>
 <!-- resumed -->

<imgSizeW>1624</imgSizeW>
<imgSizeH>1232</imgSizeH>
<error>7.4143478139918727e+001</error>
<cam1M type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    4.5249661359074507e+003 0. 3.8802378752536885e+002 0.
    4.7322013075897985e+003 -4.6265793355141220e+001 0. 0. 1.</data></cam1M>
<dist1M type_id="opencv-matrix">
  <rows>1</rows>
  <cols>5</cols>
  <dt>d</dt>
  <data>
    4.9921668140553797e+000 -3.9127832752862915e+001
    -1.2848597924228053e-001 5.1729958527179563e-002 0.</data></dist1M>
<cam1Err>9.9465117306014511e-002</cam1Err>
<cam2M type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    4.0809201332391053e+003 0. -2.5863160533898072e+003 0.
    5.5465207503753049e+002 -1.0031409700981827e+001 0. 0. 1.</data></cam2M>
<dist2M type_id="opencv-matrix">
  <rows>1</rows>
  <cols>5</cols>
  <dt>d</dt>
  <data>
    2.1904296242925554e+000 -3.9306686802274299e-001
    1.8437752313918845e-001 -6.1134319745319177e-001 0.</data></dist2M>
<cam2Err>1.0166116351399195e-001</cam2Err>
<rot type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    7.8478700811122082e-001 -3.2115568696367880e-001
    -5.3006450233035418e-001 3.5509697225959491e-001
    9.3396756794800728e-001 -4.0133805119286346e-002
    5.0795225385060261e-001 -1.5672781103611425e-001
    8.4700702538758266e-001</data></rot>
<trans type_id="opencv-matrix">
  <rows>3</rows>
  <cols>1</cols>
  <dt>d</dt>
  <data>
    1.8785463165085166e+003 1.2890651672036026e+002
    -1.3964346923814824e+003</data></trans>
<ess type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    5.6134808692706054e+002 1.2840214772478846e+003
    5.3140487474538034e+001 -2.0501156396900251e+003
    7.4289339504802365e+002 -8.5094146734464744e+002
    5.6590194965857836e+002 1.7959003954385691e+003
    -7.0644431417887716e+000</data></ess>
<fund type_id="opencv-matrix">
  <rows>3</rows>
  <cols>3</cols>
  <dt>d</dt>
  <data>
    -7.7975382126785714e-007 -1.7054919545854610e-006
    -1.1035803155575678e-004 2.0952752203606181e-005
    -7.2600788482834914e-006 3.0886930796631743e-002
    -5.0144317270169004e-003 -1.4218361475375632e-002 1.</data></fund>
    </opencv_storage>

当我只编写一个结构实例时，读取它没有问题，但是当我试图打开上面显示的文件时(该文件由帖子开头显示的代码示例保存)程序在打开该文件时崩溃:

else if (name == XML_CALIBSTRUCT)
    {
        QString filename = xml.readElementText();

        cv::FileStorage fsCal(filename.toStdString(), cv::FileStorage::READ); 

Answer 1

尝试用 { 和 } 封装结构实例。 Here是对类似问题的回答，带有一些工作代码的链接。对不起，半生不熟的回答。