在python c扩展中使用opencv的问题？

Question

我正在尝试编写一个简单的python c-extension，其中包含一些opencv代码。这是我的C ++代码：

#include "Python.h"
#include "numpy/arrayobject.h"

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>


 /* .... C matrix utility functions ..................*/
double **pymatrix_to_Carrayptrs(PyArrayObject *arrayin);
double **ptrvector(long n);
void free_Carrayptrs(double **v);
int  not_doublematrix(PyArrayObject *mat);

static PyObject *simple_cv_ops(PyObject *self, PyObject *args)
{
    PyArrayObject *matin, *matout;
    double **cin, **cout;
    int n,m, dims[2];

    /* Parse tuples separately since args will differ between C fcns */
    if (!PyArg_ParseTuple(args, "O!", &PyArray_Type, &matin))  return NULL;
    if (NULL == matin)  return NULL;

    /* Check that object input is 'double' type and a matrix
       Not needed if python wrapper function checks before call to this routine */
    if (not_doublematrix(matin)) return NULL;

    /* Get the dimensions of the input */
    n=dims[0]=matin->dimensions[0];
    m=dims[1]=matin->dimensions[1];

    /* Make a new double matrix of same dims */
    matout=(PyArrayObject *) PyArray_FromDims(2,dims,NPY_DOUBLE);

    /* Change contiguous arrays into C ** arrays (Memory is Allocated!) */
    cin=pymatrix_to_Carrayptrs(matin);
    cout=pymatrix_to_Carrayptrs(matout);

    // _______ Program LOGIC HERE ________

    cv::Mat kernel = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(10, 10), cv::Point(-1, -1));
    cv::Mat imgIn(n, m, CV_64F, cin);
    cv::Mat imgOut(n, m, CV_64F);

    cv::morphologyEx(imgIn, imgOut, cv::MORPH_CLOSE, kernel);
    cv::GaussianBlur(imgOut, imgOut, cv::Size(5, 5), 0, 0);
    cv::medianBlur(imgOut, imgOut, 5);
    cv::threshold(imgOut, imgOut, 127, 255, 0);

    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            cout[i][j] = imgOut.at<double>(i,j);

        }
    }   

// ____________________________________

    /* Free memory, close file and return */
    free_Carrayptrs(cin);
    free_Carrayptrs(cout);

    return PyArray_Return(matout);
}


/* ==== Set up the methods table ====================== */
static PyMethodDef simple_cv_methods[] = {
    {"simple_cv_ops", simple_cv_ops, METH_VARARGS, "Just a simple cv operation"},
    {NULL, NULL, 0, NULL}     /* Sentinel - marks the end of this structure */
};

static struct PyModuleDef simple_cv_modules = {
    PyModuleDef_HEAD_INIT,
    "simple_cv",
    "Python interface for the simple cv ops C library function",
    -1,
    simple_cv_methods
};

PyMODINIT_FUNC PyInit_simple_cv(void) {
    PyObject *pyob;

    pyob = PyModule_Create(&simple_cv_modules);
    import_array();

    return pyob;
}


/* ==== Create Carray from PyArray ======================
Assumes PyArray is contiguous in memory.
Memory is allocated!                                    */
double **pymatrix_to_Carrayptrs(PyArrayObject *arrayin)  {
    double **c, *a;
    int i,n,m;

    n=arrayin->dimensions[0];
    m=arrayin->dimensions[1];
    c=ptrvector(n);
    a=(double *) arrayin->data;  /* pointer to arrayin data as double */
    for ( i=0; i<n; i++)  {
        c[i]=a+i*m;  }
    return c;
}

/* ==== Allocate a double *vector (vec of pointers) ======================
Memory is Allocated!  See void free_Carray(double ** )                  */
double **ptrvector(long n)  {
    double **v;
    v=(double **)malloc((size_t) (n*sizeof(double)));
    if (!v)   {
        printf("In **ptrvector. Allocation of memory for double array failed.");
        exit(0);  }
    return v;
}

/* ==== Free a double *vector (vec of pointers) ========================== */
void free_Carrayptrs(double **v)  {
    free((char*) v);
}

/* ==== Check that PyArrayObject is a double (Float) type and a matrix ==============
return 1 if an error and raise exception */
int  not_doublematrix(PyArrayObject *mat)  {
    if (mat->descr->type_num != NPY_DOUBLE || mat->nd != 2)  {
        PyErr_SetString(PyExc_ValueError,
            "In not_doublematrix: array must be of type Float and 2 dimensional (n x m).");
        return 1;  }
    return 0;
}

为了编写c扩展名，我使用了here中的一些代码，除了在我的代码中使用opencv之外，这些代码非常有效。

这里我也发布了我的setup.py

代码：

import numpy
from distutils.core import setup, Extension

def main():
    setup(name="simple_cv",
          version="1.0.0",
          description="Python interface for the simple cv C extension library function",
          author="My Name",
          author_email="[email protected]",
          ext_modules=[Extension("simple_cv", ["simple_cv.cpp"],
                  include_dirs=[numpy.get_include(), 'C:/opencv/build/include']),
                        ])

if __name__ == "__main__":
    main()
当我运行python安装程序时，出现以下错误：

simple_cv.obj：错误LNK2001：无法解析的外部符号“ double__cdecl cv :: threshold（类cv :: _ InputArray const＆，类cv :: _ OutputArray const＆，double，double，int）“（？threshold @ cv @@ YANAEBV_InputArray @ 1 @ AEBV_OutputArray @ 1 @ NNH @ Z）simple_cv.obj：错误LNK2001：未解析的外部符号“ public：void __cdecl cv :: Mat :: deallocate（void）“（？deallocate @ Mat @ cv @@ QEAAXXZ）simple_cv.obj：错误LNK2001：未解析的外部符号“ public：void __cdecl cv :: Mat :: create（int，int const *，int）“（？create @ Mat @ cv @@ QEAAXHPEBHH @ Z）simple_cv.obj：错误LNK2001：无法解析的外部符号“类cv :: Mat __cdeclcv :: getStructuringElement（int，class cv :: Size_，classcv :: Point_）“（？getStructuringElement @ cv @@ YA？AVMat @ 1 @ HV？$ Size_ @ H @ 1 @ V？$ Point_ @ H @ 1 @@ Z）simple_cv.obj：错误LNK2001：未解决的外部符号“无效”__cdecl cv :: GaussianBlur（class cv :: _ InputArray const＆，class cv :: OutputArray const＆，class cv :: Size

，double，double，int）“（GaussianBlur @ cv @@ YAXAEBV_InputArray @ 1 @ AEBV_OutputArray @ 1 @ V？$ Size_ @ H @ 1 @ NNH @ Z）simple_cv.obj：错误LNK2001：未解决的外部符号“无效”__cdecl cv :: fastFree（void *）“（？fastFree @ cv @@ YAXPEAX @ Z）simple_cv.obj：错误LNK2001：无法解析的外部符号“私有：void __cdeclcv :: String :: deallocate（void）”（？deallocate @ String @ cv @@ AEAAXXZ）simple_cv.obj：错误LNK2001：未解析的外部符号“私人：char * __cdecl cv :: String :: allocate（unsigned __int64）“（？allocate @ String @ cv @@ AEAAPEAD_K @ Z）simple_cv.obj：错误LNK2001：未解析的外部符号“ void __cdecl cv :: error（int，classcv :: String const＆，char const *，char const *，int）“（？error @ cv @@ YAXHAEBVString @ 1 @ PEBD1H @ Z）simple_cv.obj：错误LNK2001：未解析的外部符号“ void __cdecl cv :: morphologyEx（classcv :: _ InputArray const＆，class cv :: _ OutputArray const＆，int，classcv :: InputArray const＆，class cv :: Point，int，int，classcv :: Scalar_ const＆）“（？morphologyEx @ cv @@ YAXAEBV_InputArray @ 1 @ AEBV_OutputArray @ 1 @ H0V？$ Point_ @ H @ 1 @ HHAEBV？$ Scalar_ @ N @ 1 @@@ Z）simple_cv.obj：错误LNK2001：未解决的外部符号“无效”__cdecl cv :: medianBlur（class cv :: _ InputArray const＆，class cv :: _ OutputArray const＆，int）“（？medianBlur @ cv @@ YAXAEBV_InputArray @ 1 @ AEBV_OutputArray @ 1 @ H @ Z）build \ lib.win-amd64-3.6 \ simple_cv_c.cp36-win_amd64.pyd：致命错误LNK1120：12个未解决的外部错误：命令'C：\ Program Files（x86）\ Microsoft VisualStudio \ 2017 \ Enterprise \ VC \ Tools \ MSVC \ 14.12.25827 \ bin \ HostX86 \ x64 \ link.exe'失败，退出状态为1120

现在我知道这些是链接器错误。在Visual Studio中进行编码时遇到了这个问题，我通过在我的Visual Studios项目设置的“链接器”选项卡上的其他库目录

中添加lib路径来解决此问题。但是在这里我不知道该怎么办。

通过我使用Windows 10，Visual Studio 2017和python 3.6的方式。

有人可以帮我吗？

我正在尝试编写一个简单的python c-extension，其中包含一些opencv代码。这是我的c ++代码：#include“ Python.h” #include“ numpy / arrayobject.h” #include ＃...

Answer 1