Can anyone explain to me why this code below does not work?
#include "opencv/cv.h"
#include "opencv/highgui.h"
#include <iostream>
int main(int, char**) {
cv::VideoCapture vcap;
cv::Mat image;
const std::string videoStreamAddress = "http://hg55.no-ip.org/mjpg/video.mjpg";
//Yes, this stream does work! Try to paste it into your browser...
//open the video stream and make sure it's opened
if(!vcap.open(videoStreamAddress)) {
std::cout << "Error opening video stream or file" << std::endl;
return -1;
}
for(;;) {
if(!vcap.read(image)) {
std::cout << "No frame" << std::endl;
cv::waitKey();
}
cv::imshow("Output Window", image);
if(cv::waitKey(1) >= 0) break;
}
}
This code does cannot open the stream...
The code is based on some code in this thread: OpenCV with Network Cameras
The OpenCV 1 code here works without any problem for me.
Thank you very much in advance
I tried to create a new project with Visual Studio 2010 and OpenCV 2.2, instead of OpenCV 2.3.1.
This solved all my problems!
Related
I would like to use the external PS eye cam to save 30 frames a second if that is possible.
I don't know where to find guides or the code it self since I'm pretty sure it should be somewhere online.
Anyhelp would be appreciated. Thanks in advance!
So, getting the ps3eye up and running differs depending on which OS you're running. If you're running any flavor of Debian, the drivers are already there and the code I've got below should work fine.
If you're on Windows, you'll have to find a driver for it. CodeLibrary has a driver already made, but you'll have to pay $3 for it. Link's here.
I don't know for Mac, but a bit of digging found this, which might work.
Once you've got the drivers installed, you should be able to access it like any other camera.
Simple bit of code for that is below:
#include "stdafx.h"
#include <opencv/cxcore.h>
#include <opencv2\core\mat.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <opencv/cxcore.h>
#include <opencv/highgui.h>
#include <opencv/cv.h>
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/videoio/videoio.hpp>
using namespace cv;
using namespace std;
int main() {
Mat image;
bool escnotpressed = true;
VideoCapture cap(0); // open the default camera
if(!cap.isOpened()) // check if we succeeded
return -1;
cap.set(CV_CAP_PROP_FPS, 30); //sets framerate
String capturePath = "C:/this/is/a/path.avi";
Size frameSize = Size(cap.get(CV_CAP_PROP_FRAME_WIDTH), cap.get(CV_CAP_PROP_FRAME_HEIGHT));
VideoWriter savedCapture;
savedCapture.open(capturePath, VideoWriter::fourcc('M','J','P','G'), 30.0, frameSize, true);
if (!savedCapture.isOpened()) {
return -2;
}
while(escnotpressed) { //loops
cap >> image;
if (image.empty()) {
cout << "camera feed got interrupted" << endl;
return 5; //dies if camera feed is interrupted for some reason
}
imshow("Image", image);
savedCapture << image;
int c = waitKey(10);
if( (char)c == 27 ) { escnotpressed = false;}
}
savedCapture.release();
cout << "Done!" << endl;
}
EDIT: If you've got multiple webcams on your computer, you might need to change that VideoCapture cap(0) to VideoCapture cap(x), where x gives you the right camera.
I installed opencv and configure it from tutorials, but when I am trying a code implementing it, all what is related to opencv is shown as an error as shown in the figure. Can you please help me? I really need it
#include "stdafx.h"
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace std;
using namespace cv;
int Main( void)
{
CvCapture* capture = 0;
// Start Capture From WebCam
capture = cvCaptureFromCAM( CV_CAP_ANY );
if( !capture )
{
cout << "No camera Detected" << endl;
}
// Create New Window
cvNamedWindow( "My OpenCV WebCam", CV_WINDOW_AUTOSIZE );
if( capture )
{
cout << "WebCam Is In capture" << endl;
for(;;)
{
// Get Captured Image And Show It In The New Window
// You Can Do Save It Or Filter It
IplImage* iplImg = cvQueryFrame( capture );
// Use This To Filter Image
//cvNot(iplImg, iplImg);
cvShowImage( "My OpenCV WebCam", iplImg );
if( waitKey( 10 ) >= 0 )
break;
}
}
cvReleaseCapture( &capture );
cvDestroyWindow( "My OpenCV WebCam" );
return 0;
}
From the comments to the question it turned out that the OP was linking to OpenCV 2.4.8, instead of OpenCV 3.0.0.
Correcting the linked libraries name, as well as the library path, solved the issue.
I know this question has been asked a number of times and I'm trying to implement their answers but its causing an exception in my code.
OS: Windows 7
OpenCV: 2.4.9
Here is my code:
#include "stdafx.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
using namespace cv;
using namespace std;
int main( int argc, char** argv )
{
VideoCapture cap(0); //capture the video from webcam
if ( !cap.isOpened() ) // if not success, exit program
{
cout << "Cannot open the web cam" << endl;
return -1;
}
Mat imgHSV;
_sleep(100); //give the camera a chance to wake up
while (true)
{
Mat imgOriginal;
bool success = cap.read(imgOriginal);
if (!success) //if not success, break loop
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cvtColor(imgOriginal, imgHSV, COLOR_BGR2HSV); //Convert the captured frame from BGR to HSV
vector<Mat> hsv_planes;
split( imgHSV, hsv_planes );
//hsv_planes[0] // H channel
//hsv_planes[1] // S channel
//hsv_planes[2] // V channel
imshow(thresholded_window, hsg_planes[2]); //show the S channel
if (waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
Exception is thrown on the split line: "Unhandled exception at 0x62B978C9 (opencv_core249.dll) in TrackColour.exe: 0xC0000005: Access violation writing location 0xFEEEFEEE."
I figured out my problem, incase this happens to anyone else.
In VS I was doing a debug build but I was linking to the non debug versions of opencv. Notice in my error message opencv_core249, it should have been opencv_core249d (Note the 'd'). I updated my CV linking to use the debug libraries and it works.
The other opencv calls performed fine using the wrong libraries, something must be unique with split.
I'm running this code:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.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;
}
namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
imshow( "Display window", image ); // Show our image inside it.
waitKey(0); // Wait for a keystroke in the window
return 0; }
But it isn't working for me because it shows this error on my screen when I write cmake . in terminal:
cv.h: file not found.
Could anyone help me? It was working one month ago.
you have linking problem, try this out;
g++ `pkg-config --cflags --libs opencv` filename.cpp -o filename
You can change the linker properties in case of Visual studio.
For Makefile you need to make sure that the opencv_dir is set correctly.
I run a program similar to the one in this question: https://stackoverflow.com/a/8719192/26070
#include <opencv/highgui.h>
#include <iostream>
/** #function main */
int main( int argc, char** argv )
{
cv::VideoCapture vcap;
cv::Mat image;
const std::string videoStreamAddress = "rtsp://192.0.0.1:8081/live.sdp";
//open the video stream and make sure it's opened
if(!vcap.open(videoStreamAddress)) {
std::cout << "Error opening video stream or file" << std::endl;
return -1;
}
for(;;) {
if(!vcap.read(image)) {
std::cout << "No frame" << std::endl;
cv::waitKey(500);
} else {
cv::imshow("Output Window", image);
}
if(cv::waitKey(1) >= 0) break;
}
}
The program runs fine for a certain amount of time (about one minute or so) and then the call to read() (method from cv::VideoCapture) always returns false.
The output is as follows:
[mpeg4 # 00da27a0] ac-tex damaged at 22 7
[mpeg4 # 00da27a0] Error at MB: 309
No frame
No frame
No frame
Note: the first two lines are not always present.
So, how can I determine what the root of the problem is?