I am doing some research on adaptive streaming of omnidirectional video and wanted to know what the difference is between "viewport" and "region-of-interest." I've seen it used in the same context so I'm not exactly sure if they describe the same thing.
Difference between region of interest & viewport
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As mentioned in the comments, I don't think you will find any absolute definitions for these terms and ROI in particular is often used in different ways in VR.
I think the most common definitions are likely:
So the viewport can contain one or more regions of interest.
It's gets more complicated if someone uses ROI to refer to the 'section' of a 360 video which is most likely to be of interest to the viewer. This is not the traditional meaning but I think it is easy to see how it might be used this way.