[PD] gem/pdp: darkest filter

Tim Blechmann TimBlechmann at gmx.net
Sat Nov 20 02:15:40 CET 2004

> 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.
i'll have a look at it ...

> > 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 branches.

> 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.
i'm interested in some functions to analyze video frames ... i'm working
on an audiovisual installation that is supposed to control video by
sound and vice versa ... 
in which branches will i can find the yuv_ objects? also, i don't know,
if it's good to remove objects from the sources ... maybe it's better to
have a second library of Gem objects e.g. like pidip for pdp ...

cheers ... tim

mailto:TimBlechmann at gmx.de    ICQ: 96771783

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