[PD] gem/pdp: darkest filter
cgc at humboldtblvd.com
Fri Nov 19 19:08:17 CET 2004
On Nov 19, 2004, at 7:09 AM, Tim Blechmann wrote:
> hi all,
> is there a filer for gem or pdp, that compares to frames and returns
> darkest pixel in a certain position?
pix_compare will do something similar by comparing the luma of each
pixel in two streams, and either copies the right pixel if it's lighter
('direction 1') or darker ('direction 0'). You could possibly modify
that code to your needs as well.
> also, is there a way to analyze frames (to get the average brightness
> or something similar)?
I wrote some basic analysis objects like that a few years ago, but they
didn't seem all that useful. They were part of the yuv_ objects, which
are no longer part of GEM, but they are still in CVS under some old
Is there any general interest in having some specialized objects like
this in GEM? They are simple to write and quite easy to code up in
SIMD for speed.
> thanks a lot ... tim
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