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General HD (720 / 1080) Acquisition
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Old November 19th, 2009, 05:25 PM   #16
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Join Date: Sep 2002
Location: Vancouver, British Columbia (formerly Winnipeg, Manitoba) Canada
Posts: 4,088
Originally Posted by David Heath View Post
In reality it's more complicated than you infer, owing to the necessity to avoid interline twitter. Scanning a chip for interlace means that lines have to be summed, but differently for different fields. Hence the lines of an even field may formed from chip lines 1+2, 3+4, 5+6 etc, the lines of an odd field from 2+3, 4+5, 6+7 etc. This reduces twitter, but also reduces vertical resolution compared to progressive scanning.
Agreed. It's actually a more accurate question to ask : "how many lines does it resolve?" than "what is the resolution (in common usage, the NUMBER of lines of pixels)?"
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