The Reference Image Mapper allows to flexibly map gaze data onto a reference image. In many experimental setups, there are however multiple objects of interest in the reference image (e.g. different elements of a UI, or different items on a shelf). Ultimately, one is interested in relating gaze data to those objects rather than the entire reference image. Thus, a tool that allows to define areas of interest (AOIs) in the reference image, which then maps gaze data onto the individual AOIs would be helpful. This would essentially be an optimized UI for doing what is happening in the "Define AOIs and Calculate Gaze Metrics" How-to Guide. https://docs.pupil-labs.com/invisible/how-tos/advanced-analysis/gaze-metrics-in-aois/