为什么我有错误“未解析的外部符号”void __cdecl cv :: fastNlMeansDenoising" [英] Why am I having the error "unresolved external symbol "void __cdecl cv::fastNlMeansDenoising"

问题描述

 #include <   iostream  >  
 #includeopencv2 / highgui / highgui.hpp
 #include opencv2 / imgproc / imgproc.hpp
 #include <   stdio.h  >  
 #include <   stdlib.h  >  
 #includeopencv2 / opencv.hpp
 using namespace std; 
使用命名空间cv; 
 vector <   Rect  >  detectLetters（Mat img）
 {
 vector <   Rect  >  boundRect; 
 Mat img_gray，img_sobel，img_threshold，element，img_dilated，img_denoised; 
 cvtColor（img，img_gray，CV_BGR2GRAY）; //转换为灰度
 fastNlMeansDenoising（img_gray，img_denoised，3,7,21）; 
 Sobel（img_denoised，img_sobel，CV_8U，1,0,3,1,0，BORDER_DEFAULT）; //索贝尔是一种分化功能。这用于查找渐变
 // dilate（img_sobel，img_dilated，Mat（），Point（-1，-1），1）; 
 // adaptiveThreshold（img_sobel，img_threshold，255,0，THRESH_BINARY，3,0）; 
 threshold（img_sobel，img_threshold，0,255，CV_THRESH_BINARY | CV_THRESH_OTSU）; // 
 element = getStructuringElement（MORPH_RECT，Size（17,3））; 
 morphologyEx（img_threshold，img_threshold，CV_MOP_CLOSE，element）; //技巧
 vector <   vector< Point  > >轮廓; 
 findContours（img_threshold，contours，0,1）; 
 vector <   vector< Point  > > contours_poly（contours.size（））; 
 for（int i = 0; i <     contours.size（）;     i ++    ）  
   
                   if    （等高[i] .size（） >  100）
 {
 approxPolyDP（Mat （contours [i]），contours_poly [i]，3，true）; 
 Rect appRect（boundingRect（Mat（contours_poly [i]）））; 
 if（appRect.width> appRect.height）
 boundRect.push_back（appRect）; 
} 
 imwrite（img_gray.jpg，img_gray）; 
 imwrite（img_sobel.jpg，img_sobel）; 
 imwrite（img_threshold.jpg，img_threshold）; 
 imwrite（element.jpg，element）; 
返回boundRect; 
} 
 
 int main（int argc，char ** argv）
 {
 //读取
 Mat img1 = imread（argv [1]， 1）; 
 Mat img2 = imread（argv [2]，1）; 
 //检测
 vector <   Rect  >  letterBBoxes1 = detectLetters（img1）; 
 vector <   Rect  >  letterBBoxes2 = detectLetters（img2）; 
 //显示
 for（int i = 0; i <    < span class =code-attribute> letterBBoxes1.size（）;     i ++） < span class =code-attribute> 
   
    < span class =code-attribute>               rectangle（img1，letterBBoxes1 [i]，Scalar（0,255,0），3,8,0）;   
   
           imwrite（   imgOut1_new.jpg，    img1）;   
   
           for（int     i   =   0;   i<     letterBBoxes2.size（）;     i ++）  
   
                   rectangle（img2，letterBBoxes2 [i] ，标量（0,255,0），3,8,0）;   
   
           imwrite（   imgOut2_new.jpg，    img2）;   
   
           return     0;   
   
  }  

我收到错误

 错误 LNK2019：未解析的外部符号  void __cdecl cv :: fastNlMeansDenoising（class cv :: _ InputArray const&，class cv :: _ OutputArray const&，float，int ，int）（？fastNlMeansDenoising @ cv @@ YAXABV_InputArray @ 1 @ ABV_OutputAr ray @ 1 @ MHH @ Z）在  function  中引用   class std :: vector< class cv :: Rect_< int> ;, class std :: allocator< class cv :: Rect_< int> > > __cdecl detectLetters（class cv :: Mat）（？detectLetters @@ YA？AV？$ vector @ V？$ Rect_ @ H @ cv @@ V？$ allocator @ V？$ Rect_ @ H @ cv @ @@ std @@@ std @@ VMat @ cv @@@ Z）
 

在我的代码中，当我删除fastNlMeansDenoising（）函数，错误被删除。



有谁能解释这个函数的问题是什么？

解决方案

矢量@ V'

Rect_ 3 H @ @@ CV V'

分配器@ V'

#include <iostream>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <stdio.h>
#include <stdlib.h>
#include "opencv2/opencv.hpp"
using namespace std;
using namespace cv;
vector<Rect> detectLetters(Mat img)
{
    vector<Rect> boundRect;
    Mat img_gray, img_sobel, img_threshold, element, img_dilated, img_denoised;
    cvtColor(img, img_gray, CV_BGR2GRAY); // converting to gray scale
    fastNlMeansDenoising(img_gray, img_denoised, 3, 7, 21);
    Sobel(img_denoised, img_sobel, CV_8U, 1, 0, 3, 1, 0, BORDER_DEFAULT);  // sobel is a differentiation function. this is used to find gradients
    //dilate(img_sobel,img_dilated, Mat(),Point(-1,-1),1);
    //adaptiveThreshold(img_sobel,img_threshold, 255, 0, THRESH_BINARY, 3,0);
    threshold(img_sobel, img_threshold, 0, 255, CV_THRESH_BINARY | CV_THRESH_OTSU); //
    element = getStructuringElement(MORPH_RECT, Size(17, 3));
    morphologyEx(img_threshold, img_threshold, CV_MOP_CLOSE, element); //Does the trick
    vector<vector<Point>> contours;
    findContours(img_threshold, contours, 0, 1);
    vector<vector<Point> > contours_poly( contours.size() );
    for( int i = 0; i < contours.size(); i++ )

        if (contours[i].size()>100)
        {
            approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true );
            Rect appRect( boundingRect( Mat(contours_poly[i]) ));
            if (appRect.width>appRect.height)
                boundRect.push_back(appRect);
        }
        imwrite( "img_gray.jpg", img_gray);
        imwrite( "img_sobel.jpg", img_sobel);
        imwrite( "img_threshold.jpg", img_threshold);
        imwrite( "element.jpg", element);
    return boundRect;
}

int main(int argc,char** argv)
{
    //Read
    Mat img1=imread(argv[1], 1);
    Mat img2=imread(argv[2], 1);
    //Detect
    vector<Rect> letterBBoxes1=detectLetters(img1);
    vector<Rect> letterBBoxes2=detectLetters(img2);
    //Display
    for(int i=0; i< letterBBoxes1.size(); i++)

        rectangle(img1,letterBBoxes1[i],Scalar(0,255,0),3,8,0);

    imwrite( "imgOut1_new.jpg", img1);

    for(int i=0; i< letterBBoxes2.size(); i++)

        rectangle(img2,letterBBoxes2[i],Scalar(0,255,0),3,8,0);

    imwrite( "imgOut2_new.jpg", img2);

    return 0;

}

I am getting the error

error LNK2019: unresolved external symbol "void __cdecl cv::fastNlMeansDenoising(class cv::_InputArray const &,class cv::_OutputArray const &,float,int,int)" (?fastNlMeansDenoising@cv@@YAXABV_InputArray@1@ABV_OutputArray@1@MHH@Z) referenced in function "class std::vector<class cv::Rect_<int>,class std::allocator<class cv::Rect_<int> > > __cdecl detectLetters(class cv::Mat)" (?detectLetters@@YA?AV?$vector@V?$Rect_@H@cv@@V?$allocator@V?$Rect_@H@cv@@@std@@@std@@VMat@cv@@@Z)

In my code, when I am removing fastNlMeansDenoising() function, the error is removed.

Can anyone explain what the problem is in this function??

解决方案

vector@V?

Rect_@H@cv@@V?

allocator@V?

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