Re: First BD titles under scrutiny: The Fifth Element and others
Cees,
we can debate the semantics of this issue. It's commonly accepted by most engineering folks that bobbing 1080i produces an effective vertical resolution of "540p".
Now, your point is a good one... that each individual frame may have "540p" vertical elements of resolution... but since each alternating frame would be interpolated upon the "missing" information from the frield before... that the combined effective resolution may appear higher. However, in practice the "blurring" of the two together still leaves the viewer perceiving a low-threshold of detail. I don't know if anyone has done tests to measure the actual limits of vertical frequency that can be perceived, and it very well may be closer to 720p. It would be a valuable test... though hopefully eventaully these bobbing issues can be left behind forever!
In any case, my "540p" characterization is consistent with the industry on the matter of bobbing 1080i, though I agree that better explanation of the process is helpful and your comments describe that process in detail.
And to be clear to anyone else reading who's confused, horiztonal resolution would remain unaffected by bobbing (you're still getting 1920 horizontal) regardless of the vertical reduction in perceived detail.
Quote:
| And if this is the issue, using 1080I from the Sammy should show a fully detailed image. |
Only if viewed in native 1080i60 (like on a CRT) or deinterlaced using proper inverse telecine/3-2 reversal.