daaango's profile - activity

Looks like it has to do with the ROS version of OpenNI, as saving to file works when using the unstable version of OpenNI. Refer to the original post for a link to instructions on how to do that.

Special thanks to Miguel Prada and Asomerville!

edit: For those who wish to test this for themselves (specifically qdocehf cough cough), after installing OpenNI navigate to the folder OpenNI/Samples/NiUserTracker/ and copy the following files to a new directory: SceneDrawer.cpp SceneDrawer.h main.cpp

Open up main.cpp and after line 146, paste

g_UserGenerator.GetSkeletonCap().SaveCalibrationDataToFile(nId, "calibration.bin")

and then compile the file with g++:

g++ -o NiUserTracker SceneDrawer.cpp main.cpp -I/usr/include/ni/ -l'OpenNI' -l'glut'

This will simply save the calibration of any user who performs the psi pose (continuously overwriting the .bin file). This is meant to just be a quick demo to make sure saving calibration data to file works. There is already a function on line 167 that is supposed to save calibration when the s key is pushed, but I must be using it wrong because I didn't get it working and don't really care for it enough to figure it out.

edit2: For testing loading calibration files, around line 90 of main.cpp, just paste in the following code:

g_UserGenerator.GetSkeletonCap().LoadCalibrationDataFromFile(nId, "calibration.bin");
g_UserGenerator.GetPoseDetectionCap().StopPoseDetection(nId);
g_UserGenerator.GetSkeletonCap().StartTracking(nId);

This will simply load up a calibration file as soon as a new user detected, so you'll want to fiddle around some more with code to make sure a calibration file is available, make sure its not requesting calibration after loading, etc...

You can google around for it, but here are the functions:

XnStatus SaveCalibrationData( XnUserID user, XnUInt32 nSlot )
XnStatus LoadCalibrationData( XnUserID user, XnUInt32 nSlot )

and here they are in action:

XnStatus nRetVal = g_UserGenerator.GetSkeletonCap().SaveCalibrationData(nId, saveSlot);
    if (nRetVal == XN_STATUS_OK){
        printf("Calibration data has been saved!\n");
    else 
        printf("Saving calibration data has failed!\n");

XnStatus nRetVal = g_UserGenerator.GetSkeletonCap().LoadCalibrationData(nId, loadSlot);
        if (nRetVal == XN_STATUS_OK)
        {
            g_UserGenerator.GetPoseDetectionCap().StopPoseDetection(nId);
            g_UserGenerator.GetSkeletonCap().StartTracking(nId);
        }

There's also a SaveCalibrationDataToFile but I haven't figured out a way to get it to work yet... Unless you can save it to a file, the user will have to calibration at least once because SaveCalibrationData only saves to memory from my understanding.

An example of the SaveCalibrationDataToFile can be found in the OpenNI github samples, specifically here: http://https://github.com/OpenNI/OpenNI/blob/master/Samples/NiUserTracker/main.cpp

Hi everyone,

I've been trying to use the SaveCalibrationDataToFile function in OpenNI but so far, it hasn't been going so well. When I try to call it, it returns a

Save calibration to file failed: This operation is invalid!

Here's the few lines of code:

  if (g_UserGenerator.GetSkeletonCap().IsCalibrated(nId)){
      XnStatus nRetVal = g_UserGenerator.GetSkeletonCap().SaveCalibrationDataToFile(nId, calib.bin);
      if (nRetVal != XN_STATUS_OK)
          printf("Save calibration to file failed: %s\n", xnGetStatusString(nRetVal));
  }

I also downloaded someone else's calibration file and tried to load it, but it yielded the same "operation is invalid" message. Anyone have any clues?

Thanks

Update: I tried installing ROS and OpenNI via source in order to use the newest version, but it still displays the horrid and vague "invalid" message.

Update2: I installed the latest unstable version of OpenNI and SaveCalibrationDataToFile works! For anyone who wants to do that, http://groups.google.com/group/openni... will prove to be very useful