What is a Label?

What is a Label?

A label is defined as one set of meta-informative in the form of some marker such as a "tag," "class," or "annotation object" over a single piece of raw data such as image or video. (See: What is an Annotation?)
For example, labels for images of house pets might include whether the animal is a dog or a cat, whether the animal is sitting or standing, etc.
Remember: a label is not the same as data. Data are organic content such as images, video, text, audio, or more that have no additional content or explanation attached, whereas a label is meta-information that is added to these data.
Example: Multiple annotations of the shape (box, polygon segmentation, etc.) shown in the image are combined and called a label.

Frequently Asked Questions (FAQ)

Need More Information? Have a look at some of our most frequently asked questions:

Q) Where can I see detailed information on a label?

  1. 1.
    Go to the Labels tab of the project page where the label is located.
  2. 2.
    Find the relevant label in the table and click on it to launch the Review Mode. You can view annotations and other meta-information on the label.
Related Manual:

Q) How do I manage labels?

The Labels tab contains four functions related to label management.
  • Assign labeling tasks to specific users
  • Change the status of labels (In Progress, Skipped, Submitted, etc.)
  • Export and download labels
  • Add custom Tags to labels
All these functions can be accessed through the toolbar buttons at the top of the Label Table.

Q) What does the label status (in progress, submitted, skipped) mean? When does it change?

  • In Progress: When new data is added to a project, or whenever a task is assigned to a user, the label is put into the In Progress status. It indicates that the labeling task is not completed.
  • Submitted: When a user completes and submits a labeling task in Label Mode, the label status is changed to Submitted.
  • Skipped: When a user skips a labeling task in Label Mode, the label status changes to Skipped. This can be due to ambiguities in the labeling task specs, task difficulty, or issues with the raw image (ie. blurry, too dark, etc.). Skipped images likely need further review.

Q) What does the review status (Approved, Rejected) mean? When does it change?

When a label is submitted, another user can then go through the process of reviewing whether the label is accurate. This quality assurance step leads to one of two statuses:
  • Approved: It means that the label has passed the reviewer user's quality assurance check.
  • Rejected: It means that the label did not meet the quality assurance check. In this case, the reviewer's feedback will be displayed along in the Issue Thread and the label status will change back to In Progress.
Related Manuals:

Q) Who is the Assignee?

Assignee refers to the user who is assigned to a particular label. Users of all roles can be assigned to a label.

Q) What is a Label Tag?

Label Tag is a feature that allows users to leave short notes on each label that other project stakeholders should take note of.
Related Manuals:
Any other questions? E-mail us at [email protected].