Join Date: Aug 2001
Location: Redmond, WA, USA
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|What do the numbers 45 and 33.7 mean?|
|Format converters come in many flavors such as up-converters, down-converters, side-converters, cross-converters and all-format converters. Side-converters convert between the multiple HDTV formats, for instance, 720p to 1080i or 1080i to 720p. Cross-converters are format converters that also perform frame rate conversion between 50 Hz and 60 Hz.|
|Originally posted by trbarry:
Watching a movie under 1080i would show 24 frames / second at 1920 x 1080 = 2.07 million new (non-duplicated) pixels / frame.
Watching a movie under 720p would show 24 frames / second at 1280 x 720 = .92 million new (non-duplicated) pixels / frame.
It's early morning and I'm on my first cup of coffee so I hope I haven't screwed up the math above too bad.
|I'm afraid you did, Tom. What you're describing in the first example is actually 1080p/24, not 1080i. In order to make a fair comparison you need to introduce the interlace factor and the time factor in the equation. In interlace only half the pixels are actually on the screen at any given time so a more accurate calculation would be:
1080i/24: 1920x540x24= 24,883,200 pixels per second
720p/24: 1280x720x24= 22,118,400 pixels per second