> I think if it did you would get obvious visual tearing at the boundaries of the different areas.
They could gradually blend the area with higher refresh rate to the peripheral images with lower refresh rate. You would probably not notice it because the resolution in our peripheral vision is terrible. Even with sharp tear lines it might not be noticeable if the frame rate is fast enough.
I don't think this is what they're doing, but it could be viable.
I think you're right about the other issue with foveated rendering of pass-through video. You really don't want to do much processing.
But imagine this: if you can control which line the camera starts on with its rolling shutter, you could start the camera and the display update a few lines above the point where your eye is focusing. You can blend the first few lines with the ones from the previous frame to make the tear line less obvious, which would require almost no processing. They may be processing a few lines at the time before sending it to the display for color correction, simple transformations, etc. Could be viable.
> They could gradually blend the area with higher refresh rate to the peripheral images with lower refresh rate.
I'm just not sure that's possible for update frequency. For lower/higher resolution, sure, but even with our terrible peripheral vision I think we'd notice that the center of our vision is smooth while our peripheral vision is "sticking", particularly during rapid movement.
They could gradually blend the area with higher refresh rate to the peripheral images with lower refresh rate. You would probably not notice it because the resolution in our peripheral vision is terrible. Even with sharp tear lines it might not be noticeable if the frame rate is fast enough.
I don't think this is what they're doing, but it could be viable.
I think you're right about the other issue with foveated rendering of pass-through video. You really don't want to do much processing.
But imagine this: if you can control which line the camera starts on with its rolling shutter, you could start the camera and the display update a few lines above the point where your eye is focusing. You can blend the first few lines with the ones from the previous frame to make the tear line less obvious, which would require almost no processing. They may be processing a few lines at the time before sending it to the display for color correction, simple transformations, etc. Could be viable.