Bounding Box Instructions

We strongly prefer tight bounding boxes over loose ones. There's a bit of leeway here, especially because it is also important to capture the whole head, but if the bounding boxes are too loose we will have to reject the work.
Perfect:

Acceptable:

Too loose:



For the case of people wearing hats or headgear, or who just have large hair, try to approximate where the head would be (it's alright if you're not exact).



As a general rule of thumb, if you can see a feature on a face (an eye, nose, or mouth) or if you can tell it's a forward facing head (but it's too far away to make out individual features), box it! Please err on the side of boxing heads, the exceptions being heads that are completely facing away and heads that are blocked so you cannot see any features.



It's okay if boxes overlap! But, try to only box the parts of the head you can see.



Non-living faces (portraits, faces on screens, etc.) are fair game, too! If they look realistic, box them.



We understand that some images aren't worth your time. In the case of image shown below, where there are many small, blurry heads in the background, just box the person in focus (or press "Not visible" if no one is in focus).



In cases like this one, where many faces are distinguishable, please press the "Crowd" button. We ask that you only do this in cases where there truly are crowds - at least 20 heads or so. Repeated incorrect use of this button will result in rejections.



Thank you for your help with this task! There is certainly a bit of subjectivity to our task, and we will try to be as reasonable as possible. If you have any problems with the HITs, as well as feedback or suggestions, please use the Turk email system to let us know.