I am trying to connect my camera with opencv, but window is showing a grey output screen with no image and output window of vc++ is showing the following error:
... 'opencv practice.exe': Loaded 'C:\Windows\SysWOW64\msyuv.dll',
Cannot find or open the PDB file 'opencv practice.exe': Unloaded
'C:\Windows\SysWOW64\msyuv.dll' ...
i tried fining the msyuv.dll, and it is available there.
i have one further question, next to this, i want to implement this on unity3d, so should i stick with opencv or use emgucv?
#include "StdAfx.h"
#include <stdio.h>
#include <stdlib.h>
#include <opencv\cvaux.h>
#include <opencv\highgui.h>
#include <opencv\cxcore.h>
using namespace std;
int main(int argc)
{
CvCapture* cam = NULL;`
cvNamedWindow("hi",CV_WINDOW_AUTOSIZE);
IplImage* img = NULL;
cam = cvCaptureFromCAM(-1);
char a;
while(1)
{
if(cam != NULL)
{
img = cvQueryFrame(cam);
}
else
{
printf("erro1");
return -1;
}
cvShowImage("hi", img);
a = cvWaitKey(20);
if(a == 27)
break;
}
cvReleaseCapture(&cam);
cvDestroyAllWindows();
return 0;
}
Related
I am kind of an intermediate in Computer Vison and fairly proficient in opencv python however coming to c++ i am facing problems in just selecting ROI from Video feed and displaying the cropped feed .My code looks like this.
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/tracking.hpp"
#include "iostream"
using namespace cv;
using namespace std;
int main() {
Mat frame1;
VideoCapture cap;
cap.open(0);
cap.read(frame1);
Rect2d roi = selectROI(frame1, true);
Mat Crop = frame1(roi);
while (1) {
cap.read(frame1);
Crop = frame1(roi);
if (Crop.empty()) {
cerr << "ERROR! blank frame grabbed\n";
break;
}
imshow("roi", Crop);
int key=waitkey(0);
}
}
The code is compiling ,and the cropped window is seen however I am always in need to click enter,spacebar or esc to get the video feed.Weird?
So the correct version of the corrected code will look somewhat like this.Thanks for the help.
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/tracking.hpp"
#include "iostream"
using namespace cv;
using namespace std;
int main() {
Mat frame1;
VideoCapture cap;
cap.open(0);
cap.read(frame1);
Rect2d roi = selectROI(frame1, true);
Mat Crop = frame1(roi);
while (1) {
cap.read(frame1);
Crop = frame1(roi);
if (Crop.empty()) {
cerr << "ERROR! blank frame grabbed\n";
break;
}
imshow("roi", Crop);
*int key=waitkey(1)*;
}
}
#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
#include "opencv2/opencv.hpp"
#include <opencv2/highgui.hpp>
#include <iostream>
#include <Windows.h>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <direct.h>
#pragma comment(lib, "vfw32.lib")
#pragma comment( lib, "comctl32.lib" )
using namespace cv;
using namespace std;
void PrintFullPath(char * partialPath)
{
char full[_MAX_PATH];
if (_fullpath(full, partialPath, _MAX_PATH) != NULL)
printf("Full path is: %s\n", full);
else
printf("Invalid path\n");
}
int main(int argc, char** argv)
{
PrintFullPath(".\\");
Mat edges;
VideoCapture cap;
try
{
cap.open(0); // open the default camera
}
catch (...)
{
cout << "error!!" << endl;
}
if (!cap.isOpened()) // check if we succeeded
return -1;
//Mat edges;
namedWindow("edges", 1);
for (;;)
{
Mat frame;
cap >> frame; // get a new frame from camera
edges = frame;
GaussianBlur(edges, edges, Size(7, 7), 1.5, 1.5);
//Canny(edges, edges, 0, 30, 3);
//Sleep(2000);
imshow("edges", edges);
if (waitKey(30) >= 0) break;
}
return 0;
}
the program crashes ONLY when the debugger is attached, when i press f5 it crashes in line "cap.open(0)", but when I press cntrol f5 it runs perfectly.
the error i get is:
Unhandled exception at 0x09068EFB in opencv_1.exe: 0xC0000005: Access violation executing location 0x09068EFB.
im using visual studio 2013, windows 8.0, opencv 3.0.
if i run the exe file in the command line the prorgam runs perfectly.
I'm trying to play a video file using the following code.
When run it only shows a black screen with the window name (Video), can anyone help me fix it.
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <opencv2\core\core.hpp>
#include "opencv2/opencv.hpp"
using namespace cv;
int main( int argc, char** argv )
{
CvCapture* capture = cvCreateFileCapture( "1.avi" );
Mat frame= cvQueryFrame(capture);
imshow("Video", frame);
waitKey();
cvReleaseCapture(&capture);
}
Try this if you only want to play a video ::::::::::::::::::::::::::
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <opencv2\core\core.hpp>
#include "opencv2/opencv.hpp"
int main(int argc, char** argv)
{
cvNamedWindow("Example3", CV_WINDOW_AUTOSIZE);
//CvCapture* capture = cvCreateFileCapture("20051210-w50s.flv");
CvCapture* capture = cvCreateFileCapture("1.wmv");
/* if(!capture)
{
std::cout <<"Video Not Opened\n";
return -1;
}*/
IplImage* frame = NULL;
while(1) {
frame = cvQueryFrame(capture);
//std::cout << "Inside loop\n";
if (!frame)
break;
cvShowImage("Example3", frame);
char c = cvWaitKey(33);
if (c == 27) break;
}
cvReleaseCapture(&capture);
cvDestroyWindow("Example3");
std::cout << "Hello!";
return 0;
}
Actually the code you posted won't even compile.
Just have a look at OpenCV documentation: Reading and Writing images and video
#include "opencv2/opencv.hpp"
using namespace cv;
int main(int, char**)
{
VideoCapture cap(0); // open the default camera
//Video Capture cap(path_to_video); // open the video file
if(!cap.isOpened()) // check if we succeeded
return -1;
namedWindow("Video",1);
for(;;)
{
Mat frame;
cap >> frame; // get a new frame from camera
imshow("Video", frame);
if(waitKey(30) >= 0) break;
}
// the camera will be deinitialized automatically in VideoCapture destructor
return 0;
}
Coming from a Windows world, I'm quite new to the OS X environment. I have created a simple OpenCV project with XCode from scratch to only show a video feed, it works. But I wanted to show my students how to insert text in image with the putText method and it fails to compile. I have added core, videoio and highgui libs to the project.
The following errors occur
Here is the simple code.
#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
using namespace std;
int main(int argc, const char * argv[])
{
Mat img;
VideoCapture capture;
if (!capture.open(0)) {
cout << "Erreur d'ouverture de caméra\n";
return -1;
}
int c = 0;
int result = 0;
bool captureOk = true;
string winName = "Main window";
string testString = "TEST!";
while (c != 27) {
captureOk = capture.read(img);
if (captureOk) {
putText(img, testString, Point(30, 30), FONT_HERSHEY_SIMPLEX, 0.5, Scalar(255));
imshow(winName, img);
}
else {
result = -1;
}
c = waitKey(1);
}
return result;
}
Thanks!
Which OpenCV's function support the analog camera for live streaming?
Please give me the answer.
I tried CvCapture and VideoCapture functions of OpenCV.
It works for USB camera but did not work for Analog camera.
I tried VideoInput function.It works well with analog camera but i want opencv inbuilt function.
So please help me.
Thanks for your time.
This is the code for cvcapture function which I have used.
#include "stdafx.h"
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include "videoInput.h"
#include <opencv2/imgproc/imgproc.hpp>
using namespace cv;
using namespace std;
char key;
int main()
{
cvNamedWindow("Camera_Output", 1); //Create window
CvCapture* capture = cvCaptureFromCAM(CV_CAP_ANY); //Capture using any camera connected to your system
while(1){ //Create infinte loop for live streaming
IplImage* frame = cvQueryFrame(capture); //Create image frames from capture
cvShowImage("Camera_Output", frame); //Show image frames on created window
key = cvWaitKey(10); //Capture Keyboard stroke
if (char(key) == 27){
break; //If you hit ESC key loop will break.
}
}
cvReleaseCapture(&capture); //Release capture.
cvDestroyWindow("Camera_Output"); //Destroy Window
return 0;
}
end of code
Next code is using VideoInput function.
The code is
#include "stdafx.h"
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include "videoInput.h"
#include <opencv2/imgproc/imgproc.hpp>
using namespace cv;
using namespace std;
int main(int, char**)
{
videoInput VI;
int numDevices = VI.listDevices();
//int device1= 0;
VI.setup(0);
unsigned char* yourBuffer = new unsigned char[VI.getSize(0)];
IplImage* colourImage = cvCreateImage(cvSize(320,240),8,3);
while(1)
{
VI.grabFrame(0, yourBuffer);
colourImage->imageData = (char*)yourBuffer;
cvConvertImage(colourImage, colourImage, 3);
cvShowImage("test",colourImage);
if( cvWaitKey(10) == 27)
break;
}
return 0;
}
end of code
and last code is using videocapture function
the code is
#include "stdafx.h"
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include "videoInput.h"
#include <opencv2/imgproc/imgproc.hpp>
using namespace cv;
using namespace std;
int main() {
VideoCapture stream1(-1); //0 is the id of video device.0 if you have only one camera.
if (!stream1.isOpened()) { //check if video device has been initialised
cout << "cannot open camera";
return 0;
}
//unconditional loop
while (true) {
Mat cameraFrame;
stream1.read(cameraFrame);
imshow("cam", cameraFrame);
if (waitKey(30) >= 0)
break;
}
return 0;
}
End of code
Please help me.