Saving the calibration file

[Rtms1984]

Hi, for some reasons I can't manage to save the calibration .xml file in stereo camera mode. It is working fine in single camera mode. I'm using the Windows release.

[BZandi]

What happens if you press the save button directly after the successfully performed stereo calibration ?

[Rtms1984]

I choose the directory and put a name for the file but it saves nothing.

[BZandi]

I could not reproduce this issue. Today, I tested it on a Windows machine with the PupilEXT 0.1.1 release, and everything is working. Maybe you use an invalid name. See the attached video, which I recorded during today's calibration.

StereoCalibration_Example.mp4

[BZandi]

It must be something specific with your PC settings, like permission to wright or similar. Try to save the file directly on your Desktop.

Additional solution:
When you close PupilEXT after successful calibration, the last calibration file is also always saved automatically (for backup reasons) under the following path: C:\Users\ ...YourUserName... \AppData\Roaming\FGLT\PupilEXT

Locate this folder and check if you see the calibration file there. The folder "AppData" is a hidden folder. You will not see it under recent files. So you need to turn on "show hidden folder" in windows and locate this path manually. See here how to view hidden files:
https://support.microsoft.com/en-us/windows/view-hidden-files-and-folders-in-windows-10-97fbc472-c603-9d90-91d0-1166d1d9f4b5

[Rtms1984]

There is no file there also. If the problem is with the permission to write how come I can save the calibration files in single camera mode?

[BZandi]

There is no file there also. If the problem is with the permission to write how come I can save the calibration files in single camera mode?

True, that's strange. As I cannot replicate this issue, it is hard to debug. Can you please take a screenshot to see which files are stored in the following folders:

C:\Users\ ...YourUserName... \AppData\Roaming\FGLT\PupilEXT
and
C:\Users\ ...YourUserName... \AppData\Roaming\FGLT\

Do you have a space in the user name of your windows, like "PC John" or similar?

@lodemo do you have an idea what could cause this issue?

[Rtms1984]

PupilEXT is empty and FGLT has this empty folder + PupilEXT.ini .
Yes there is a space in the user name.

[BZandi]

I think the space in your username could be the problem. Try to remove it. It is recommended to follow a tutorial for changing the username. Spaces should be avoided when setting a username. It causes issues. See this thread for example:

conda/conda#8725

[BZandi]

Think I located the source of the problem. In the file PupilEXT/src/subwindows/stereoCameraCalibrationView.cpp (line 228 to 243), the calibration file will be saved with the following method:

void StereoCameraCalibrationView::onSaveClick() {
    QString filename = QFileDialog::getSaveFileName(this, tr("Save Calibration File"), "", tr("XML files (*.xml)"));

    if(!filename.isEmpty()) {
        filename.replace(" ", "");

        QFileInfo fileInfo(filename);
        // check if filename has extension, else append xml to it
        if(fileInfo.suffix().isEmpty()) {
            filename = filename + ".xml";
        }

        std::cout<<"Saving calibration file to settings directory: "<< filename.toStdString() <<std::endl;
        calibrationWorker->saveToFile(filename.toStdString().c_str());
    }
}

After the if condition with the code filename.replace(" ", ""); all spaces will be removed from the selected path in the dialog window. For example, if you select the Desktop and your username has a space, the file will not be saved correctly, as the username is part of the path. This issue does not happen with the single camera calibration, as the code snippet for removing the spaces is not applied there. See the filePupilEXT/src/subwindows/singleCameraCalibrationView.cpp in line 214 to 227.

As you have a space in your Windows username you will run into this when you save a stereo calibration file. This will be solved in the next release.

As a workaround, you can try to save the stereo calibration file directly into the C:\ drive or another disc without a space or the username in the save path. Please, let me know if this workaround was successful for you.

[Rtms1984]

It worked. Thanks!

[QJieWang]

thanks，I did really meet the same question.

[QJieWang]

I use Win10 and can't save the calibration XML file. In the end, I find the PupilEXT should Run as an administrator to get the right to write XML file on Desktop or C Disk.