OpenCV/WishList/IO/WriteMatrix - Revision history

Daviddoria at 15:25, 20 September 2011

2011-09-20T15:25:11Z

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2011-02-16T22:03:16Z

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Daviddoria: /* CMakeLists.txt */

2011-01-21T20:48:08Z

‎CMakeLists.txt

Daviddoria at 15:31, 21 January 2011

2011-01-21T15:31:02Z

Daviddoria at 15:26, 21 January 2011

2011-01-21T15:26:28Z

Daviddoria at 15:13, 21 January 2011

2011-01-21T15:13:37Z

Daviddoria at 15:04, 21 January 2011

2011-01-21T15:04:55Z

Daviddoria at 15:04, 21 January 2011

2011-01-21T15:04:04Z

Daviddoria: Created page with '==WriteMatrix.cxx== #include "cv.h" #include "opencv2/highgui/highgui.hpp" #include int main(int argc, char*argv[]) { cv::Mat myMatrix(3,3,CV_3…'

2011-01-21T15:02:06Z

Created page with '==WriteMatrix.cxx== <source lang="cpp"> #include "cv.h" #include "opencv2/highgui/highgui.hpp" #include <iostream> int main(int argc, char*argv[]) { cv::Mat myMatrix(3,3,CV_3…'

New page

==WriteMatrix.cxx==
<source lang="cpp">
#include "cv.h"
#include "opencv2/highgui/highgui.hpp"

#include <iostream>

int main(int argc, char*argv[])
{
cv::Mat myMatrix(3,3,CV_32FC3);
std::cout << "Input:" << std::endl;
for(unsigned int i = 0; i < 3; i++)
{
for(unsigned int j = 0; j < 3; j++)
{
cv::Point3f myPoint;
myPoint.x = 1;
myPoint.y = 2;
myPoint.z = 3;
myMatrix.at<cv::Point3f>(i,j) = myPoint;
}
}

std::cout << myMatrix << std::endl;

cv::imwrite("matrix.jpg", myMatrix);

cv::Mat inputMatrix = cv::imread("matrix.jpg", 1);

std::cout << inputMatrix << std::endl;

return 0;
}

</source>

==CMakeLists.txt==
<source lang="cmake">
cmake_minimum_required(VERSION 2.6)

PROJECT(WriteMatrix)

FIND_PACKAGE(OpenCV REQUIRED )
INCLUDE_DIRECTORIES( ${OPENCV_INCLUDE_DIR} )

ADD_EXECUTABLE(WriteMatrix WriteMatrix.cxx)
TARGET_LINK_LIBRARIES(WriteMatrix opencv_core opencv_highgui
opencv_flann opencv_imgproc opencv_highgui opencv_ml opencv_video opencv_objdetect
opencv_features2d opencv_calib3d opencv_legacy opencv_contrib
)

</source>

@@ Line 27: / Line 27: @@
    // Write the matrix to a file
-   cv::FileStorage fsout("test.mat", cv::FileStorage::WRITE);
+   cv::FileStorage fsout("test.yml", cv::FileStorage::WRITE);
    fsout << "myMatrix" << myMatrix;
    // Read the file back in to test that it was written correctly
    cv::Mat myMatrix2(3,3,CV_32FC1);
-   cv::FileStorage fsin("test.mat", cv::FileStorage::READ);
+   cv::FileStorage fsin("test.yml", cv::FileStorage::READ);
    fsin["myMatrix"] >> myMatrix2;

@@ Line 1: / Line 1: @@
-This works fine for integer valued matrices, but how do you write a float matrix to a file?
+OpenCV Error: Parsing error (test.mat(0): Valid XML should start with '<?xml ...?>') in icvXMLParse, file /home/doriad/src/OpenCV/modules/core/src/persistence.cpp, line 2136
 ==WriteMatrix.cxx==
@@ Line 11: / Line 13: @@
 int main(int argc, char*argv[])
+{
    cv::Mat myMatrix(3,3,CV_32FC1);
    std::cout << "Input:" << std::endl;
@@ Line 22: / Line 25: @@
    std::cout << myMatrix << std::endl;
-−
-   cv::FileStorage fs("test.mat", cv::FileStorage::WRITE);
+   // Write the matrix to a file
-   fs << myMatrix;
+   cv::FileStorage fsout("test.mat", cv::FileStorage::WRITE);
+   fsout << "myMatrix" << myMatrix;
    return 0;
+}

← Older revision		Revision as of 15:04, 21 January 2011
Line 1:		Line 1:
		+	This works fine for integer valued matrices, but how do you write a float matrix to a file?
		+
	==WriteMatrix.cxx==		==WriteMatrix.cxx==
	<source lang="cpp">		<source lang="cpp">

@@ Line 3: / Line 3: @@
    what():  /home/doriad/src/OpenCV/modules/core/src/persistence.cpp:2136: error: (-212) test.mat(0): Valid XML should start with '<?xml ...?>' in function icvXMLParse
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+==WriteMatrix.cxx==
 ==CMakeLists.txt==

@@ Line 55: / Line 55: @@
 ADD_EXECUTABLE(WriteMatrix WriteMatrix.cxx)
-TARGET_LINK_LIBRARIES(WriteMatrix opencv_core opencv_highgui
+TARGET_LINK_LIBRARIES(WriteMatrix ${OpenCV_LIBS})
-opencv_flann opencv_imgproc opencv_highgui opencv_ml opencv_video opencv_objdetect
-          opencv_features2d opencv_calib3d opencv_legacy opencv_contrib
-−
 </source>

@@ Line 5: / Line 5: @@
 #include "cv.h"
 #include "opencv2/highgui/highgui.hpp"
 #include <iostream>
@@ Line 22: / Line 23: @@
    std::cout << myMatrix << std::endl;
-   cv::imwrite("matrix.jpg", myMatrix);
+   cv::FileStorage fs("test.mat", cv::FileStorage::WRITE);
+   fs << myMatrix;
-  // Doesn't work - the matrix that is read back in has been rounded to integers!
-  cv::Mat inputMatrix = cv::imread("matrix.jpg", 0);
-−
-   std::cout << inputMatrix << std::endl;
    return 0;
+}

@@ Line 8: / Line 8: @@
 int main(int argc, char*argv[])
+{
-   cv::Mat myMatrix(3,3,CV_32FC3);
+   cv::Mat myMatrix(3,3,CV_32FC1);
    std::cout << "Input:" << std::endl;
    for(unsigned int i = 0; i < 3; i++)
@@ Line 14: / Line 14: @@
      for(unsigned int j = 0; j < 3; j++)
+       {
-      cv::Point3f myPoint;
+       myMatrix.at<float>(i,j) = 2.1;
-      myPoint.x = 1;
-      myPoint.y = 2;
-      myPoint.z = 3;
-       myMatrix.at<cv::Point3f>(i,j) = myPoint;
+       }
+     }
@@ Line 25: / Line 21: @@
    cv::imwrite("matrix.jpg", myMatrix);
-−
-   cv::Mat inputMatrix = cv::imread("matrix.jpg", 1);
+   // Doesn't work - the matrix that is read back in has been rounded to integers!
    std::cout << inputMatrix << std::endl;
@@ Line 32: / Line 29: @@
    return 0;
+}