OpenCV在Linux中使用CodeBlocks编译Eigenface.cpp

Question

我想用CodeBlocks或Linux终端编译以下OpenCV程序。

http://plaza.ufl.edu/tyler727/imdl/src/eigenface.cpp

line 57: nTrainFaces = loadFaceImgArray("/home/hacker/data/Eigenfacecpp/train.txt"); 

    line 192: // load test images and ground truth for person number 
      nTestFaces = loadFaceImgArray("/home/hacker/data/Eigenfacecpp/test.txt"); 

    // project the training images onto the PCA subspace 
    projectedTrainFaceMat = cvCreateMat(nTrainFaces, nEigens, CV_32FC1); 
    for(i=0; i<nTrainFaces; i++) 
    { 
     cvEigenDecomposite(faceImgArr[i], 
          nEigens, 
          eigenVectArr, 
          0, 0, 
          pAvgTrainImg, 
line 78:     projectedTrainFaceMat->data.fl + i*nEigens); 
    } 

    cvCalcEigenObjects(nTrainFaces, 
         (void*)faceImgArr, 
         (void*)eigenVectArr, 
         CV_EIGOBJ_NO_CALLBACK, 
         0, 
         0, 
         &calcLimit, 
         pAvgTrainImg, 
line 154:    eigenValMat->data.fl); 

     //project the test image onto the PCA subspace 
     cvEigenDecomposite(faceImgArr[i], 
          nEigens, 
          eigenVectArr, 
          0, 0, 
          pAvgTrainImg, 
line 211:     projectedTestFace); 

，我得到了这些错误：

Compiling: eigenface.cpp 

In Function »void learn()«: 
line 57: deprecated conversion from string constant to ‘char*’ [Wwrite-strings] 

In Function »double recognize()«: 
line 192: deprecated conversion from string constant to ‘char*’ [Wwrite-strings] 

/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crt1.o: In function `_start': 
(.text+0x18): undefined reference to `main' 
obj/Debug/eigenface.o: In function `learn()': 
/home/hacker/data/Eigenfacecpp/eigenface.cpp:78: undefined reference to `cvEigenDecomposite' 

obj/Debug/eigenface.o: In function `doPCA()': 
/home/hacker/data/Eigenfacecpp/eigenface.cpp:154: undefined reference to `cvCalcEigenObjects' 

obj/Debug/eigenface.o: In function `recognize()': 
/home/hacker/data/Eigenfacecpp/eigenface.cpp:211: undefined reference to `cvEigenDecomposite' 

我不明白我做错了什么。我认为这很愚蠢，但我找不到它。

编译器和代码块调试器设置：

链接设置 - >其他选项：-lopencv_core -lopencv_objdetect -lopencv_imgproc -lopencv_highgui

搜索Directories->编译器：/usr/local/include/opencv 搜索Directories->链接：/usr/lib

有什么我在这里做错了？ 请帮我解决这个问题。

Answer 1

1. 你的源代码，不包括main()功能，因此无论是从http://plaza.ufl.edu/tyler727/imdl/src/main.cpp下载main.cpp文件，并把它放在你的项目目录中，或者取消在eigenface.cpp的main()或者甚至写自己的main()功能。
2. 使用opencv的链接器选项的完整列表是：-lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_objdetect -lopencv_photo -lopencv_stitching -lopencv_ts -lopencv_video -lopencv_videostab当然，您可能不需要所有这些库，但它不会因为链接器足够聪明而受到伤害，并且只会包含实际引用的库。
3. 在命令行中，您可能会发出g++ main.cpp eigenface.cpp -o eigenface -I/usr/include/opencv -L/usr/lib <all linker flags in "2">将/usr/inlude/opencv替换为包含OpenCV标题的目录，并将/usr/lib替换为包含所有库管理器文件的目录。如果您使用发行版的软件包管理器（如apt-get或yum）来安装OpenCV，这些可能是默认位置。

Answer 2

find/usr/lib -name'libopencv * .so'| xargs readelf -s | egrep“FUNCTION_NAME | libop” find/usr/lib -name'libopencv * .so'| xargs readelf -s | egrep的 “cvEigenDecomposite | libop”

文件：./libopencv_legacy.so 680：00000000000936f0 1046 FUNC全局默认11 cvEigenDecomposite 所以用 'libopencv_legacy.so'
-lopencv_legacy

Answer 3

查看参考文献[3]和链接[4] from http://plaza.ufl.edu/tyler727/imdl/Lovelly_FCRAR12.pdf