C++ 不识别 opencv 变量

Question

大家好，我有以下处理图像的代码。我是 c++ 和 vis studio 的新手。该程序使用 opencv，所以我下载了它并使我的项目指向构建配置中的必要库。当我尝试构建代码时，它似乎无法识别 opencv 变量。当我将 opencv 库添加到构建中时，有什么想法吗？

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#include <cv.h>
    #include <highgui.h>
    #include <math.h>
    #include <iostream>
    #include "StdAfx.h"

    void sampleImage(const IplImage* arr, float idx0, float idx1, CvScalar& res)
    {
      if(idx0<0 || idx1<0 || idx0>(cvGetSize(arr).height-1) || idx1>(cvGetSize(arr).width-1)){
        res.val[0]=0;
        res.val[1]=0;
        res.val[2]=0;
        res.val[3]=0;
        return;
      }
      float idx0_fl=floor(idx0);
      float idx0_cl=ceil(idx0);
      float idx1_fl=floor(idx1);
      float idx1_cl=ceil(idx1);

      CvScalar s1=cvGet2D(arr,(int)idx0_fl,(int)idx1_fl);
      CvScalar s2=cvGet2D(arr,(int)idx0_fl,(int)idx1_cl);
      CvScalar s3=cvGet2D(arr,(int)idx0_cl,(int)idx1_cl);
      CvScalar s4=cvGet2D(arr,(int)idx0_cl,(int)idx1_fl);
      float x = idx0 - idx0_fl;
      float y = idx1 - idx1_fl;
      res.val[0]= s1.val[0]*(1-x)*(1-y) + s2.val[0]*(1-x)*y + s3.val[0]*x*y + s4.val[0]*x*(1-y);
      res.val[1]= s1.val[1]*(1-x)*(1-y) + s2.val[1]*(1-x)*y + s3.val[1]*x*y + s4.val[1]*x*(1-y);
      res.val[2]= s1.val[2]*(1-x)*(1-y) + s2.val[2]*(1-x)*y + s3.val[2]*x*y + s4.val[2]*x*(1-y);
      res.val[3]= s1.val[3]*(1-x)*(1-y) + s2.val[3]*(1-x)*y + s3.val[3]*x*y + s4.val[3]*x*(1-y);
    }

    float xscale;
    float yscale;
    float xshift;
    float yshift;

    float getRadialX(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = x+((x-cx)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float getRadialY(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = y+((y-cy)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float thresh = 1;
    float calc_shift(float x1,float x2,float cx,float k){
      float x3 = x1+(x2-x1)*0.5;
      float res1 = x1+((x1-cx)*k*((x1-cx)*(x1-cx)));
      float res3 = x3+((x3-cx)*k*((x3-cx)*(x3-cx)));

      //  std::cerr<<"x1: "<<x1<<" - "<<res1<<" x3: "<<x3<<" - "<<res3<<std::endl;

      if(res1>-thresh && res1 < thresh)
        return x1;
      if(res3<0){
        return calc_shift(x3,x2,cx,k);
      }
      else{
        return calc_shift(x1,x3,cx,k);
      }
    }

    int main(int argc, char** argv)
    {
      IplImage* src = cvLoadImage( argv[1], 1 );
      IplImage* dst = cvCreateImage(cvGetSize(src),src->depth,src->nChannels);
      IplImage* dst2 = cvCreateImage(cvGetSize(src),src->depth,src->nChannels);
      float K=atof(argv[3]);
      float centerX=atoi(argv[4]);
      float centerY=atoi(argv[5]);
      int width = cvGetSize(src).width;
      int height = cvGetSize(src).height;

      xshift = calc_shift(0,centerX-1,centerX,K);
      float newcenterX = width-centerX;
      float xshift_2 = calc_shift(0,newcenterX-1,newcenterX,K);

      yshift = calc_shift(0,centerY-1,centerY,K);
      float newcenterY = height-centerY;
      float yshift_2 = calc_shift(0,newcenterY-1,newcenterY,K);
      //  scale = (centerX-xshift)/centerX;
      xscale = (width-xshift-xshift_2)/width;
      yscale = (height-yshift-yshift_2)/height;

      std::cerr<<xshift<<" "<<yshift<<" "<<xscale<<" "<<yscale<<std::endl;
      std::cerr<<cvGetSize(src).height<<std::endl;
      std::cerr<<cvGetSize(src).width<<std::endl;

      for(int j=0;j<cvGetSize(dst).height;j++){
        for(int i=0;i<cvGetSize(dst).width;i++){
          CvScalar s;
          float x = getRadialX((float)i,(float)j,centerX,centerY,K);
          float y = getRadialY((float)i,(float)j,centerX,centerY,K);
          sampleImage(src,y,x,s);
          cvSet2D(dst,j,i,s);

        }
      }
    #if 0
      cvNamedWindow( "Source1", 1 );
      cvShowImage( "Source1", dst);
      cvWaitKey(0);
    #endif

      cvSaveImage(argv[2],dst,0);

    #if 0
      for(int j=0;j<cvGetSize(src).height;j++){
        for(int i=0;i<cvGetSize(src).width;i++){
          CvScalar s;
          sampleImage(src,j+0.25,i+0.25,s);
          cvSet2D(dst,j,i,s);
        }
      }

      cvNamedWindow( "Source1", 1 );
      cvShowImage( "Source1", src);
      cvWaitKey(0);

    #endif  

}

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1>------ Build started: Project: sherize, Configuration: Debug Win32 ------
1>  sherize.cpp
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(1): warning C4627: '#include <cv.h>': skipped when looking for precompiled header use
1>          Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(2): warning C4627: '#include <highgui.h>': skipped when looking for precompiled header use
1>          Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(3): warning C4627: '#include <math.h>': skipped when looking for precompiled header use
1>          Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(4): warning C4627: '#include <iostream>': skipped when looking for precompiled header use
1>          Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(7): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(7): error C2143: syntax error : missing ',' before '*'
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2065: 'idx0' : undeclared identifier
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2065: 'idx1' : undeclared identifier
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2065: 'idx0' : undeclared identifier
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2065: 'arr' : undeclared identifier
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2228: left of '.height' must have class/struct/union
1>          type is ''unknown-type''
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2065: 'idx1' : undeclared identifier
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2065: 'arr' : undeclared identifier
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C2228: left of '.width' must have class/struct/union
1>          type is ''unknown-type''
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C3861: 'cvGetSize': identifier not found
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(9): error C3861: 'cvGetSize': identifier not found
1>c:\users\mat\documents\visual studio 2010\projects\sherize\sherize\sherize.cpp(10): error C2065: 'res' : undeclared identifier
1>c:\

Answer 1

那是因为你把#include "stdafx.h"在其他标题之后。这是 VC++ 的(默认)预编译 header 标记 - 它会丢弃此包含之前的所有内容并改为加载其预编译 header 状态，即忽略此处的 cv.h 包含。

这意味着您应该将 stdafx.h 包含移动到文件顶部或移动 #include <cv.h>等进入 stdafx.h。如果您想将它们包含在项目的所有文件中并且它们不太可能在构建之间更改，那么将它们添加到 stdafx.h 将它们包含在预编译头文件中并且它们将自动(有效地)可用于项目中的所有资源。