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Techniques for Independent Production
The challenges of creating Digital Cinema and other narrative forms.

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Old October 21st, 2003, 08:15 PM   #1
Regular Crew
Join Date: Oct 2003
Location: San Diego, CA USA
Posts: 163

Can someone tell me in simple terms what Up-rezzing is all about? How does it work? Thanks!
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Old October 21st, 2003, 08:48 PM   #2
Join Date: Feb 2002
Location: Cleveland, Ohio
Posts: 1,929
Here's a good link for you.

Resampling and Interpolation Demystified
All the best,
Robert K S

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Old October 21st, 2003, 08:59 PM   #3
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Join Date: Jun 2003
Location: San Jose, CA
Posts: 2,218
Thanks for the link. The sample pictures were quite useful.

What I don't understand is why in this day and age popular
image processing programs don't offer full 2D sinc function
interpolation for image resizing. It's a computer. Sure,
the image will shift in both dimensions by the group delay,
but just crop the image by that amount automatically. Or,
just keep these new pixels produced by the resampling process
and include them in the resize automatically. There really
should no aliasing going on. I think the problem is that
coder just do connect the dots and haven't looked at the
frequency responses of these spline and low order polynomial filters. If users are worried about 8 vs. 16 bit word depth for
images, they should definitely be worrying about noise levels
that are much higher than the 8 bit level. Generally, better
interpolation filters reduce contrast at image feature edges,
but after resampling, this contrast is noise. For static images,
it may be less of a deal, but for video, this noise will appear
to swim. The horror !

As for the comment on the sharpening filter, this just amplifies
high frequencies, and of course, noise.
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