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Posted by Richard Crowley on 11/14/06 15:25
"Jukka Aho" <jukka.aho@iki.fi> wrote in message
news:6p46h.51554$hj2.16076@reader1.news.jippii.net...
> Richard Crowley wrote:
>
>> <mv@movingvision.co.uk> wrote...
>>
>>> Interesting that say converting from NTSC to PAL is best? I've
>>> always
>>> found it better the other way. It's always better to down convert
>>> from a superior format than try to add data upwards.
>
>> Spatial interpolation is significantly easier than temporal.
>
> That's true as a general statement, but does it work as an answer to
> the question? I'd argue that for a perfect PAL <=> NTSC conversion you
> will have to do temporal interpolation regardless of the direction of
> the conversion.
There is no "perfect conversion". However going from 30FPS
to 25FPS at least gives you more to work with than you need.
Going in the other direction requires the hardware/software to
"use its imagination" to fill in the missing pieces. Which one
do you think is easier to do?
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