Creating a dataset with multiple users - conflict issues?

Hi,

I just finished writing an annotation tool in MATLAB to label images. The idea is to create a labeled dataset.

The utility I wrote saves the filepath of the images, and their associated labels. I would like multiple users to be able to label their images, and regroup the results.

What's the best way to have multiple people using this utility? I'm concerned with redundancies and conflicting entries if several users use the utility at the same time.

Currently, the results are stored in a hashtable variable, which is loaded every time the script is launched.

Thank you!