Identifier not found with a function in Opencv, how to solve this?

Question

I'm trying to use this function:

fastNlMeansDenoising(image, image, 3.0, 7, 21);

Using OpenCV with Visual Studio 2010 express, but it said "identifier not found". I did a quick search and found that this must be a ".lib" is missing, but I did not find which library should I add in my project for this function to work. Anyone could help me with this?

Answer 1

Ok. In order to use fastNlMeansDenoising(image, image, 3.0, 7, 21);

1) You need to configure opencv 2.4.8 or 2.4.9.

Here is procedure to link opencv 249 with Visual studio.

2) Use the following code to test opencv function

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

using namespace std;
using namespace cv;

int main()
{
   // load the image

   Mat img = imread("lenna.jpg");


   if(!img.data) 
   {
      cout << "File not found" << endl;
      return -1;
   }

   // show it in a window
   namedWindow( "Image", WINDOW_AUTOSIZE );
   imshow("Image", img);

   // image window will immediately disappear if the program ends, so
   // we'll wait for a keypress, indefinitely
   waitKey();

   // do a simple transformation: convert to grayscale

   // first copy the image
   Mat img_gray = img.clone();
   Mat img1;
   cvtColor(img, img_gray, CV_RGB2GRAY);
   fastNlMeansDenoising(img_gray,img1,3.0,7,21);
   imshow("Image", img1);
   waitKey();
   return 0;
}

Hope, this helps you. Cheers,

Answer 2

The function is defined in the photo.hpp file. So you have to get the opencv_photo300.lib

Edit 1:

I searched a little bit (sorry im at work, dont have more time) and i couldnt find the library itself. You can go ahead and build opencv yourself from: https://github.com/Itseez/opencv Then you can just search that folder for the lib. An installationguide for the build process is here: http://docs.opencv.org/trunk/doc/tutorials/introduction/windows_install/windows_install.html

Edit 2:

Berak is right, the opencv_photo300.lib is not in the 2.3 Version of OpenCV. Update your OpenCV to the current version 2.4.9 and you'll have what you need.

Answer 3

您将必须使用opencv 2.4.9，但在2.3.0中不可用