Show some previous annotations for all ids to see the mapping from target to id.
Current situation
When annotating ids, you have to keep track of which target has which id.
Use case
You are annotating an episode of big bang theory: face bounding boxes and ids.
During the first frames, you gave Sheldon id 1, Leonard id 2 and Penny id 3.
After annotating targets with other ids > 3, you may have forgotten the mapping from targets to ids ("Which id was Penny?").
After opening "show previous ids", a window pops up and shows some previous example annotations (in terms of bounding box content) for every id used in the annotations.
Other benefits
User can see, whether multiple ids were given to the same target.
Goal
Current situation
Use case
You are annotating an episode of big bang theory: face bounding boxes and ids. During the first frames, you gave Sheldon id 1, Leonard id 2 and Penny id 3. After annotating targets with other ids > 3, you may have forgotten the mapping from targets to ids ("Which id was Penny?"). After opening "show previous ids", a window pops up and shows some previous example annotations (in terms of bounding box content) for every id used in the annotations.
Other benefits