Vizier87's profile - activity

Wouldn't that create a lot of files though? I just wanted it to be like, if I slide a trackbar to 1, it'll create one fi

Thanks berak. That did the job for me. By the way I have a slightly related issue: Right now my code, since the VideoW

Hi guys, hit a snag on this one. I'm trying to make the simplest recording from a video feed in imshow (Mat current_frame), not from a webcam.

Basically I'm trying to record what happens to a feed in an imshow.

So in my main function, I invoke the following to create the video folder:

VideoWriter cap1("C:\\Users\\Bla3\\Combined.avi", VideoWriter::fourcc('M', 'J', 'P', 'G'), 5, Size(CAP_PROP_FRAME_WIDTH, CAP_PROP_FRAME_HEIGHT), true);

And when I slide a trackbar in my while(1) routine to start recording like this:

if (RecState == 1) {
                        cap1.write(current_frame);
                    }

Should that already do the trick? Am I mising something here?

Thanks.

Edit: In short, what is the simplest code to just record an imshow without using VideoCapture?

Recording from imshow/matrix, not from webcam Hi guys, hit a snag on this one. I'm trying to make the simplest recording

Yeah. The video file does not play, which I believe is due to the write() not working as intended. Technically, those tw

Recording from imshow/matrix, not from webcam Hi guys, hit a snag on this one. I'm trying to make the simplest recording

Ok my bad.. so if I wanted to express it in mW, is it possible?

Converting camera feed into relative intensity in mW Hi guys, general question here. I think this might have been questi

Hi guys,

I'm currently using a specialized camera (OWL 320 Raptor Photonics). I'm attempting at connecting it with OpenCV, but I guess the protocol is not as straightforward as it could be with a simple USB-connected type.

I've tried it by changing the values from 0-2 in the following line:

VideoCapture capture(0);

And it doesn't detect the feed. It works fine with my old webcam, for the record.

The camera is run by a specialized software called XCAP. This software runs well, no issues, and I get the feed just fine.

I'm using OpenCV 4.1.1 with Visual Studio C++ 2019.

Is it still possible though?

Thanks. Vizier87

PS: The complete code is attached here: https://www.mediafire.com/file/fyl3b8...

Sorry I didn't want to clutter this query since it was quite long.

You're right! Here's the working code for future inquirers: // Basic code for importing an image from a OWL 320 Camera

Thanks berak. I feel I'm getting much closer now. Right now I'm just testing this line of the code: Mat img(pxd_imageYd

Hi berak, hope you don't mind me coming back here. I was informed that the following subroutine imports the array data f

Hi berak, hope you don't mind me coming back here. I was informed that the following subroutine imports the array data f

Hi berak, hope you don't mind me coming back here. I was informed that the following subroutine imports the array data f

Oh wow.. I was thinking we might have to buy it. Luckily I archived a copy of the CD into ISO when the camera came to me

Hi berak, I think I might have a lead: http://www.epixinc.com/manuals/pixci_eb1/index.htm#6.2.%20The%20Simplest%20XCLIB%

I guess I'll have to record the video and then perform some dumb processing later... Sigh. I'll see if I can still acce

Oh my.. Do you think there's another way? Anyway, does the SDK enable OpenCV access to the frames grabbed?

And this can only be done if I have the SDK/API? Or is there a workaround? Honestly I prefer workarounds.. VS2019 offe

and I get the feed just fine. what does it mean ? involving code ? I meant the feed was fine using the XCAP software.

Good question. I've sent an email to the guys in the company and see if it comes with something.

Accessing a camera-linked X1 mini PCIE camera Hi guys, I'm currently using a specialized camera (OWL 320 Raptor Photoni

Accessing a camera-linked X1 mini PCIE camera Hi guys, I'm currently using a specialized camera (OWL 320 Raptor Photoni

Exodus to OpenCV 4 issues Hi guys, I have managed to initialize my OpenCV 4 using VS2019 pretty ok. Got a blank Mat to

Exodus to OpenCV 4 issues Hi guys, I have managed to initialize my OpenCV 4 using VS2019 pretty ok. Got a blank Mat to

Access denied when debugging ALL_BUILD in CMake Hi all, I've been following a tutorial using CMake to operate the lates

Access denied when debugging ALL_BUILD in CMake Hi all, I've been following a tutorial using CMake to operate the lates

Access denied when debugging ALL_BUILD in CMake Hi all, I've been following a tutorial using CMake to operate the lates

Thanks berak. Will update soon.

Unwanted autocrop in video feed Hi guys, I'm using a specialized camera which runs from the uEye Cockpit. The feed look

You mean like VideoCapture capture(0, CAP_DSHOW);?

OpenCV 3.0.0 and my OS: Windows 7 Home Edition. I know.. I haven't updated with OpenCV v4 but this works still fine fo

Hi guys,

I'd like to detect small but undefined shapes with a certain value of surface area, say 25 pixels worth. Now, I tried coding by calculating an array of pixels with adjacency but it seems pretty tedious and demanding for the debugging.

Let's say I want to detect an image with at least 3 x 1 green pixels (where I have performed threshold the image to a binary black & green form):

  for (int i = 0; i < Image.rows; i++){

        if (Image.at<cv::Vec3b>(i , 200)[1] == 255){                

           if (Image.at<cv::Vec3b>(i+1 , 200)[1] == 255){

                if (Image.at<cv::Vec3b>(i+2 , 200)[1] == 255){              
                   putText(Image, "Detected", Point(20, 20), FONT_HERSHEY_PLAIN, 1, Scalar::all(255), 2, 8);
                }

           }

        }
    }

Now, this seemed to work but occasionally it'll crash due to the memory.

I suppose there are workarounds to this? How do I do this?

Thanks bros.

"Major ver = 6" return from console Hi guys, I'm initiating a simple connection with an in-built camera in a system. It

Ok new development, I've set the output size as you suggested, still same error but I noticed in the console when it occured: https://s16.postimg.org/67cpsstv9/Unt...

I've read about it in another forum: http://stackoverflow.com/questions/21... , and I suspect the reason was as provided on the lack of image in some frames.. I'm pretty sure it may occur in a few instances throughout some of the videos.

Can I just make the code skip that particular error like VB.net's On Error Resume Next? Sorry I'm still polishing my C++.

Thanks berak.

Oh dayum!! You're a wizard man. I left the program running without the Videowriter and there it pops up! What should I do? Resize the window to a bigger one or make it static sized without depending on frame1.size().width etc?

Well the output video is definitely working fine, as for the recording as well, and I can even play the video afterwards but only up to the point when the program crashed though.

I understand if there's an "overflow" there'll be that error you're thinking of, right? But in my case the output was as attached: https://s11.postimg.org/c8de7sstv/Unt...

Anyway if I understood you wrong, please correct me.

Thanks!

You mean the output window size? Yes, I checked by using

putText(dst_img, std::to_string(Point(dst_img.size().width)) + " " + std::to_string(dst_img.size().height)), FONT_HERSHEY_PLAIN, 1, Scalar::all(255), 2, 8);

And then put the values into the VideoWriter variables. I hope that's what you meant?

Thanks berak. Still gettting the same error. I wonder if it is due to memory? The output video file is only about 70 MB though..

Here's a screenshot of the error: https://s15.postimg.org/gkwc40w3v/Unt...

Anything else I might have missed?

Hi guys,

I was recording my video output combining 6 videos into one and used the DIVX encoding using VideoWriter.

The video recorded fine until it always returned "unhandled exception" at some point. The output video can be played only up to the point it crashed.

Can someone point out what's might be the reason?

int main(int, char**) {

(Contains deleted code lines due to file location for anonymity)

if (!capture1.isOpened() && !capture2.isOpened() && !capture3.isOpened() && !capture4.isOpened() && !capture5.isOpened() && !capture6.isOpened())  // check if we succeeded
    return -1;


struct timeb start, end;
int diff;
int i = 0;
long buffer = 0;


VideoWriter video("Path", CV_FOURCC('D', 'I', 'V', 'X'), 5, Size(1058, 710), true);
bool State = false;

namedWindow("Video", 1);
for (;;)
{

    ftime(&start);
    Mat frame1, frame2, frame3, frame4, frame5, frame6;

    capture1 >> frame1; // get a new frame from camera
    capture2 >> frame2;
    capture3 >> frame3;
    capture4 >> frame4;
    capture5 >> frame5;
    capture6 >> frame6;

    int width = frame1.size().width * 0.5;
    int height = frame1.size().height * 0.7;

    resize(frame1, frame1, Size(height, width), 0, 0, INTER_CUBIC);
    resize(frame2, frame2, Size(height, width), 0, 0, INTER_CUBIC);
    resize(frame3, frame3, Size(height, width), 0, 0, INTER_CUBIC);
    resize(frame4, frame4, Size(height, width), 0, 0, INTER_CUBIC);
    resize(frame5, frame5, Size(height, width), 0, 0, INTER_CUBIC);
    resize(frame6, frame6, Size(height, width), 0, 0, INTER_CUBIC);

    Mat dst_img(cv::Size(frame1.size().width * 3 + 50, frame1.size().height * 2 + 70), frame1.type(), cv::Scalar(0, 0, 0));



    frame1.copyTo(dst_img(Rect(10, 10, frame1.cols, frame1.rows)));
    frame2.copyTo(dst_img(Rect(frame2.size().width + 20, 10, frame2.cols, frame2.rows)));
    frame3.copyTo(dst_img(Rect(30 + frame2.size().width * 2, 10, frame3.cols, frame3.rows)));
    frame4.copyTo(dst_img(Rect(10, frame1.size().height + 20, frame4.cols, frame4.rows)));
    frame5.copyTo(dst_img(Rect(frame2.size().width + 20, frame1.size().height + 20, frame4.cols, frame4.rows)));
    frame6.copyTo(dst_img(Rect(30 + frame2.size().width * 2, frame1.size().height + 20, frame4.cols, frame4.rows)));

    ////////////////////////////////////////////////////////////////////////////////////
    // Calculating Frequency Output Region /////////////////////////////////////////////
    ////////////////////////////////////////////////////////////////////////////////////
    std::stringstream FreqDisp;
    ftime(&end);
    diff = (int)(1000.0 * (end.time - start.time) + (end.millitm - start.millitm));
    buffer = diff + buffer;


    if (10 + buffer * 0.01 > 20000){
        return 0;
    }

    FreqDisp << std::setprecision(1) << std::to_string(10 + buffer * 0.01);


    putText(dst_img, FreqDisp.str() + " MHz", Point(20, dst_img.size().height - 20), FONT_HERSHEY_PLAIN, 1, Scalar::all(255), 2, 8);
    putText(dst_img, "Control", Point(dst_img.size().width - 100, dst_img.size().height - 20), FONT_HERSHEY_PLAIN, 1, Scalar::all(255), 2, 8);

    imshow("Video", dst_img);
    video.write(dst_img);

    if (waitKey(30) >= 0) break;
}

return 0;

}

Thanks for the suggestion man.. They sometimes move, but most of the time they're stationary.

But the video feed is always like "noisy".. I don't know how to describe it.

Lemme play around with this function for a while.