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安装Libsvm工具箱常见问题解决方法
1&Compile&of&'libsvmread.c'&failed
&&这个问题一般是vc++6.0没装好。重装一下vc++6.0，选择英文版，不要选择中文版。&2&&&make
Warning:&argeArrayDims&specified&with&-l&option¬&found&on&-L&path&&
&&E:\PROGRAM&FILES\MATLAB71\BIN\MEX.PL:&Error:&'libsvmread.c'¬&found.&&
If&make.m&failes,&please&check&README&about&detailed&instructions.&
这种情况是因为没有将current&folder&设定为libsvm-matlab；解决方法，将当前文件夹设定为D:\matlab\libsvm-3.17\matlab
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(4)(12)(2)(4)(11)(11)(8)(7)(1)c++ - Linker Error (MEX could not find the OpenCV library) - Stack Overflow
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I'm using MATLAB R2013a x64 and Win7 x64. I installed OpenCV 2.4.7.2 to the path (C:\opencv). Previous compile errors with round are solved, but now there is a linking error.
MEX command output:
&& mex -LC:\opencv\build\x64\vc11\lib -IC:\opencv\build\include\opencv -lcv -lcxcore me_HaarDetectOpenCV.cpp
Warning: MEX could not find the library "cv" specified with -l option.
MEX looked for a file with one of the names:
MEX looked for the library in the following directories:
D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\LIB\amd64
D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\ATLMFC\LIB\amd64
C:\Program Files (x86)\Windows Kits\8.0\lib\win8\um\x64
D:\Program Files\MATLAB\R2013a\extern\lib\win64
D:\Program Files\MATLAB\R2013a\extern\lib\win64\microsoft
C:\opencv\build\x64\vc11\lib
Warning: MEX could not find the library "cxcore" specified with -l option.
MEX looked for a file with one of the names:
cxcore.lib
libcxcore.lib
MEX looked for the library in the following directories:
D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\LIB\amd64
D:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\ATLMFC\LIB\amd64
C:\Program Files (x86)\Windows Kits\8.0\lib\win8\um\x64
D:\Program Files\MATLAB\R2013a\extern\lib\win64
D:\Program Files\MATLAB\R2013a\extern\lib\win64\microsoft
C:\opencv\build\x64\vc11\lib
Creating library C:\Users\AsUs\AppData\Local\Temp\mex_47j5SQ\templib.x and object C:\Users\AsUs\AppData\Local\Temp\mex_47j5SQ\templib.exp
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvCreateImage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvReleaseImage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvCreateMemStorage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvReleaseMemStorage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvGetSeqElem referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvLoad referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvEqualizeHist referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvReleaseHaarClassifierCascade referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvHaarDetectObjects referenced in function mexFunction
me_HaarDetectOpenCV.mexw64 : fatal error LNK1120: 9 unresolved externals
D:\PROGRA~2\MATLAB\R2013A\BIN\MEX.PL: Error: Link of 'me_HaarDetectOpenCV.mexw64' failed.
Error using mex (line 206)
Unable to complete successfully.
How do I fix the error and compile (create the MEX file me_HaarDetectOpenCV.mexw64)?
and fix error .
#include "D:\Program Files\MATLAB\R2013a\extern\include\mex.h"
#include "C:\opencv\build\include\opencv\cv.h"
#include "C:\opencv\build\include\opencv\highgui.h"
#include "C:\opencv\build\include\opencv\cxcore.h"
MEX command output:
&& mex me_HaarDetectOpenCV.cpp
Creating library C:\Users\AsUs\AppData\Local\Temp\mex_7BQNq1\templib.x and object C:\Users\AsUs\AppData\Local\Temp\mex_7BQNq1\templib.exp
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvReleaseMemStorage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvReleaseHaarClassifierCascade referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvReleaseImage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvGetSeqElem referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvHaarDetectObjects referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvEqualizeHist referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvCreateMemStorage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvCreateImage referenced in function mexFunction
me_HaarDetectOpenCV.obj : error LNK2019: unresolved external symbol cvLoad referenced in function mexFunction
me_HaarDetectOpenCV.mexw64 : fatal error LNK1120: 9 unresolved externals
D:\PROGRA~2\MATLAB\R2013A\BIN\MEX.PL: Error: Link of 'me_HaarDetectOpenCV.mexw64' failed.
Error using mex (line 206)
Unable to complete successfully.
106k19179320
As I mentioned in previous comments, your code is using the old C interface of OpenCV. It is preferred to use the newer C++ interface.
Perhaps it is best to show a complete example. The code below runs face detecting using the Haar-based . I simplified it from your code a bit by removing some of the parameters parsing.
If you want an easier wrapper for using OpenCV inside MATLAB, consider using .
#include "mex.h"
#include &string&
#include "opencv2/opencv.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/imgproc/imgproc.hpp"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
// validate arguments
if (nrhs & 2) {
mexErrMsgTxt("Wrong number of input arguments.");
if (nlhs & 1) {
mexErrMsgTxt("Too many output arguments.");
if (!mxIsChar(prhs[0]) || mxGetM(prhs[0])!=1) {
mexErrMsgTxt("First argument must be a string.");
if (!mxIsUint8(prhs[1]) || mxGetNumberOfDimensions(prhs[0])!=2) {
mexErrMsgTxt("Second argument must be a uint8 grayscale image.");
// get XML cascade file name
char *xmlfile = mxArrayToString(prhs[0]);
cv::CascadeC
if (!cascade.load(std::string(xmlfile))) {
mexErrMsgTxt("Failed to load cascade classifier.");
mxFree(xmlfile);
// get grayscale image
mwSize nrows = mxGetM(prhs[1]);
mwSize ncols = mxGetN(prhs[1]);
uint8_T *data = reinterpret_cast&uint8_T*&(mxGetData(prhs[1]));
// copy into an OpenCV mat (there are better ways to do this step!)
cv::Mat img(nrows, ncols, CV_8UC1, cv::Scalar::all(0));
for(mwIndex c=0; c& c++) {
for(mwIndex r=0; r& r++) {
img.at&char&(r,c) = data[r + nrows*c];
// process image before detection
cv::equalizeHist(img, img);
// detect faces
std::vector&cv::Rect&
cascade.detectMultiScale(img, faces, 1.1, 4, 0, cv::Size(30,30));
// return rectangles found to MATLAB
plhs[0] = mxCreateDoubleMatrix(4, faces.size(), mxREAL);
double *out = mxGetPr(plhs[0]);
for(mwIndex i=0; i&faces.size(); i++) {
out[i+0] = static_cast&double&(faces[i].x);
out[i+1] = static_cast&double&(faces[i].y);
out[i+2] = static_cast&double&(faces[i].width);
out[i+3] = static_cast&double&(faces[i].height);
Assuming you have download OpenCV 2.4.7 and extracted it into C:\OpenCV (with sources and build sub-directories beneath it), run the following command to compile the code:
mex -largeArrayDims -I'C:\OpenCV\build\include' -L'C:\OpenCV\build\x64\vc11\lib'
-lopencv_core247 -lopencv_imgproc247 -lopencv_objdetect247 faces.cpp
(adjust the libraries path above according to your compiler. I'm using VS2012)
Next we test the MEX-function in MATLAB:
% some grayscale face image
img = imread('http://www.ece.rice.edu/~wakin/images/lena512.bmp');
% detect face
rect = faces('./haarcascade_frontalface_alt2.xml', img);
% show result
imshow(img)
rectangle('Position',rect(:,1), 'LineWidth',4, 'EdgeColor','g')
106k19179320
It depends on the version of OpenCV, but for newer versions, you will not find a cxcore library.
In 2.4.7 it is opencv_core247d.lib for the Debug build and and opencv_core247.lib for the Release build.
Look at the documentation for
the version of OpenCV that you are using. It sounds like you are using rather old instructions.
provides instructions for building applications with OpenCV in Windows, and it lists the names of the libraries that you typically include. Obviously, the Visual Studio IDE instructions do not apply.
Based on the unresolved external symbols, you should probably link the following libraries:
opencv_core247
opencv_imgproc247
opencv_objdetect247
opencv_features2d247
opencv_highgui247
This probably too many, but it won't hurt.
26.3k64671
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