I tried to play a video using OpenCV-2.4.7 in Visual Studio 2010, Win 7
Code is as follow-
#include<opencv\cv.h>
#include <opencv\highgui.h>
using namespace cv;
int main( int argc, char** argv ) {
cvNamedWindow( "Window", CV_WINDOW_AUTOSIZE );
CvCapture* capture = cvCreateFileCapture( "C:/Users/17/Desktop/Wildlife.avi" );
IplImage* frame;
while(1) {
frame = cvQueryFrame( capture );
if( !frame ) break;
cvShowImage( "Window", frame );
char c = cvWaitKey(33);
if( c == 27 ) break;
}
cvReleaseCapture( &capture );
cvDestroyWindow( "Window" );
}
Debugs is fine but on running, a waring window opens saying "The program can't start because libiconv-2.dll is missing from your computer".
I tried to download libiconv-2.dll into system package then it showed the error "C:\Windows\System32\libiconv-2.dll', Binary was not built with debug information".
Is there any possible missing setting?? what should be done to run this code?
It's an issue with opencv_ffmpeg247.dll in the latest release (2.4.7) as described here
I'm having the same issue, though with the fix earmarked for 2.4.8 I'd suggest either installing an earlier version (2.4.6) or using the latest copy from the repo here
Related
I know this is similar to some other posts but still a little different...
I'm using the newest version of Xcode with SDL. The following code should show me a window but nothing happens except that I get the following message: Metal API Validation Enabled
Program ended with exit code: 0
When I disable this validation nothing happens at all. Any ideas on what might be wrong?
#include <SDL2/SDL.h>
#include <iostream>
int main() {
SDL_Init((SDL_INIT_VIDEO) <0);
SDL_Window *window;
window = SDL_CreateWindow("Title", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN); //also tried different WINDOW_ input here
if (window == NULL) {
// In the case that the window could not be made...
printf("Could not create window: %s\n", SDL_GetError());
return 1;
}
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
SDL_Delay(3000);
}
````
I don't have enough reputation to comment, but for a start, the int main() should be replaced with int main(int argc, char* argv[]) and i'm not sure about SDL_Init((SDL_INIT_VIDEO) <0); just try SDL_Init(SDL_INIT_VIDEO); also, im not 100% about this I don't use mac, but if there are .dll on mac make sure you have the correct .dll files aswell (note what you're compiling (64bit or 32bit) use the corresponding .dll files)
i'm runing a simple code
#include<opencv2/opencv.hpp>
#include"iostream"
using namespace std;
using namespace cv;
int main()
{
Mat image1 = imread("C:\\Users\\Public\\Pictures\\Sample Pictures\\Tulips.jpg");
Mat image = imread("Koala.jpg");
if (image.empty())
{
cout << "no image" << endl;
system("pause");
}
imshow("win1", image1);
waitKey(0);
imshow("win2", image);
waitKey(0);
return 0;
}
when i run the code using "start without debugging (ctrl+f5)" it runs fine and the ouput image appear.
but when i run it using "start debugging (f5)" it gives opencv_world341d.dll is missing.
how to fix this.
This happen because the application couldn't find the correct dll, there are 2 solutions for this problem.
Add dll to exe location
Add dll to system path
The "opencv_world341d.dll" can be found in this location $OPENCV_INSTALL_DIR/build/x64/vc15/bin
hope this helps...
I run this sample cod, and i get run time exception
#include "stdafx.h"
#include <iostream>
using namespace std;
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
using namespace cv;
int _tmain(int argc, char** argv)
{
//IplImage* img = cvLoadImage( "Walk1001.jpg" ,1 );
IplImage* img =cvLoadImage( argv[1] );
if(!img)
cout << "Could not open or find the image" << endl ;
cvNamedWindow( "Example1", 1 );
cvShowImage( "Example1", img );
cvWaitKey(0);
cvReleaseImage( &img );
cvDestroyWindow( "Example1" );
return 0;
}
when i use IplImage* img = cvLoadImage( "Walk1001.jpg" ,1 ); instead of this IplImage* img =cvLoadImage( argv[1] ); program runs fine. but otherwise i got error.
What is to do with argv. i have came across many programs in which image is loaded through some argv[] syntex! how to use this array (argv[]) or what else?
to use the argv array, you've got to supply arguments to your program (from the cmdline, or similar)
prog.exe Walk1001.jpg 19
now argv holds 3 elements, [ "prog.exe", "Walk1001.jpg", "19" ], and argc==3
in your program , do:
char * imgPath="Walk1001.jpg"; // having defaults is a good idea
if ( argc > 1 ) // CHECK if there's actual arguments !
{
imgPath = argv[1]; // argv[0] holds the program-name
}
int number = 24;
if ( argc > 2 ) // CHECK again, if there's enough arguments
{
number = atoi(argv[2]); // you get the picture..
}
sidenote: you seem to be a beginner (nothing wrong with that!), the opencv api has changed over the years, please don't use IplImage* and cv*Functions(the 1.0 api),
use cv::Mat and functions from cv:: namespace.
using namespace cv;
int main(int argc, char** argv)
{
char * imgPath="Walk1001.jpg";
if ( argc > 1 )
{
imgPath = argv[1];
}
Mat img = imread( imgPath );
if ( img.empty() )
{
cout << "Could not open or find the image" << endl ;
return 1;
}
namedWindow( "Example1", 1 );
imshow( "Example1", img );
waitKey(0);
// no, you don't have to release Mat !
return 0;
}
I am getting run time exception. the error is line 2482 unknown function in array.cpp? I think i get this message from imshow after debugging. I'm using Mat img=imread("walk100.jpg"); but the img.total() returning NULL. why imread is returning NULL. cvload is working perfectly.
I got this solved, on the web i came to know about ***d.dll. while adding dll files, I omitted the d, that is for release mode not for debug mode. So I just place "d", like opencv_core244d.dll instead of opencv_core244.dll
thanks all for your contribution
While I was working on a project, I noticed that I am not able to load images. Here is the simple code that I used to check:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/objdetect/objdetect.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main( int argc, char** argv )
{
if( argc != 2)
{
cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
return -1;
}
Mat image;
image = imread(argv[1], CV_LOAD_IMAGE_COLOR); // Read the file
if(! image.data ) // Check for invalid input
{
cout << "Could not open or find the image" << std::endl ;
return -1;
}
Mat gray_image;
cv::cvtColor(image, gray_image, CV_RGB2GRAY);
imwrite("Gray_Image.jpg",gray_image);
return 0;
}
Here is its output when I execute it:
root#beaglebone:~# ./tryit lena.jpg
Could not open or find the image
I tried to directly use the address of the image ("/home/root/lena.jpg") instead of argv[1] but nothing changed.
What can be the problem?
ps: I am cross-compiling this OpenCV program and then running it on my BeagleBone which has Angstrom Linux installed on it. Can this problem related to it?
I solved my problem by deleting existing OpenCV libraries on my angstrom image and replacing them with the working ones.
Try saving the image with a png extension and then opening it. For some reason, files with a png extension work better than other extensions like jpg/gif.
I am a beginner for Eclipse. I now have Eclipse C/C++ IDE with OpenCV library running on Windows 7. So far it works after spending hours trying to get it running. But then I realize that Eclipse does not pop up a command prompt as VS2010 does while debugging. And moreover Eclipse's debug mode is just stuck in there and refuse to output anything. But if the code doesn't involve the OpenCV things it works again.
Below is the code I use for testing. It captures images from webcam and output it to the screen. The infinite loop (until you press 'q') makes sure it constantly grabs new inputs from the camera.
I browsed through the workspace and run the exe just compiled and it worked flawlessly. So I don't think there's anything wrong in the code (it's an example code anyway
In brief, can I just pop up a command prompt window in debug mode? And why is Eclipse console stuck when the code involves some OpenCV functions?
#include <stdio.h>
#include <stdlib.h>
#include <tchar.h>
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include <iostream>
int _tmain(int argc, _TCHAR* argv[])
{
CvCapture *capture = 0;
IplImage *frame = 0;
int key = 0;
/* initialize camera */
capture = cvCaptureFromCAM( 0 );
/* always check */
if ( !capture ) {
printf("Cannot open initialize webcam!\n");
return 1;
}
/* create a window for the video */
cvNamedWindow( "result", CV_WINDOW_AUTOSIZE );
while( key != 'q' ) {
/* get a frame */
frame = cvQueryFrame( capture );
/* always check */
if( !frame ) break;
/* display current frame */
cvShowImage( "result", frame );
/* exit if user press 'q' */
key = cvWaitKey( 1 );
}
/* free memory */
cvDestroyWindow( "result" );
cvReleaseCapture( &capture );
return 0;
}
This is because you have already set the windows 7 system variable PATH to your MinGw/bin and compiled opencv bin directories. So when you run the program from your folder your system automatically take the required binaries from its PATH and the program runs correctly.
I don't know why but Eclipse does not take it directly from the system environment PATH variable. So we have to set it ourself.
go to Preferences > C/C++ (Expand it) > Environment > Add:
"Name:PATH"
"Value:C:\MinGW\bin;C:\opencv_MinGW\bin"
where opencv_MinGW is the folder where I compiled my opencv