From XDCAM EX-1 to what?

[Bill Davis]

Helge,

It might be helpful to note that interlaced shooting actually IMPROVES the temporal resolution of a piece of video. The perceived frame rate doubles if you can take two “snapshots” of an object in motion over the same period of time – as in interlacing 60 “half-resolution” frames over the time period that would otherwise be used to record 30 progressive frames.

Given the larger raster of 1080 and the motion smoothing effect of interlaced shooting – 1080i becomes a great choice for objects in motion.

720p would be better if, for instance, you wanted to pull still frames off static or slow moving video. Then the temporal resolution wouldn’t help you, but the higher density progressive raster would.

Hope that helps.

[Craig Seeman]

Keep in mind that 720p60 (or 50 in PAL) is also 60 snapshots per second so the temporal resolution is as good as 1080i60 (or 50 in PAL). Actually if you consider 1920×1080 is 540 lines at 1/60 and 1280×720 is 720 lines at 1/60 one might say 720 has more lines more closely together in 1/60. I’ve seen arguments on both sides of this but both have a temporal change occurring every 1/60.