Lidar Labeler Source Loading Error, but folder exists in position specified.

I am attempting to load a lidar labeling session. Whenever I select my session with 'Import Session', I get the following error:

'The following sources could not be found. If you moved them, consider adding their new location to the MATLAB path or placing them in the same folder as the session file'

However, the folder specified by the error message exists, and it contains the relevant pointclouds.

I have added the folder location to the MATLAB path, as well as moving the session file to the same folder where my pointclouds are located, however I still receive the error.

Furthermore, I also worked with the Video Labeller on this dataset. My data came from a ROS Bagfile containing images and pointclouds, where the images were placed under one folder, and the pointclouds under another. There are an equal number of images and pointclouds and the two folders containing the respective file types are in the same directory. I do not have this error when loading the video labelling session.

How can I fix this 'error' so that I can access my work? I have spent a lot of time on labeling this data, and the error message is extremely ambiguous. I just want to access the gTruth data. I have attempted to load the labelling session into the MATLAb workspace directly, but the gTruth data does not appear to be accessible in this way, but surely it must be there somewhere? Whenever I export the data the labels are in their own timetable and appear to have no reference to the actual files they are labelling, so there must be some way of extracting the data.

Answer 1

[Anurag]

Hi James,

I understand that you are receiving an error while importing a Lidar labelling session. Also, you are unable to access the ground truth data.

Please refer to the following to help you solve your errors:

• Check File Paths and Filenames

Double-check that the file paths and filenames in your labelling session match the actual paths and filenames of your Lidar data. Thеrе might be subtle differences or typos that are causing MATLAB to not locate the files properly.

• Rеchеck the Session File

Make sure that the session file (with the “.session” extension) accurately references the point clouds. It's possible that there could be an issue with the session file itself.

• Project or Folder Structure

Ensure that your labelling project, session file, and data are organized within a project folder structure that MATLAB recognizes. The project structure should be maintained when you move the session to another location. Make sure the session file is at the project’s root level.

• Use the Data Store

If you don't sее the data when loading the session into the MATLAB workspace, it might be stored in the Data Store. You can access it using the datastore function.

Lastly, If the above steps do not work, consider recreating the session. You can manually add labels to the data using the “imagеLabеlеr” app and then export the labelling results as a new session. This can be time-consuming but can help overcome issues with the original session file.

Hope this helped!

Regards,

Anurag