pdp_v4l (was Re: [PD] video analysis II)

[marius schebella]

hi,
thanks a lot for all the suggestions on video analysis!!!
i use now glx for output, (need it for debugging and building only, during
performance i do not need it, ... i still was not able to install xvideo...)
and pdp_scanxy~ for analyzing the picture.
with pdp_v4l is it possible to have a smaller resolution than 64*64? or is
then the input messed up? 4*4 or 5*5 would be enough for my purposes.
and i cannot switch to greyscale with the command "type grey". pdp gives an
error message like "no method for 'type'".
but these are subtleties. in the main the patch is working.
marius.



----- Original Message -----
From: "Tom Schouten" <doelie at zzz.kotnet.org>
To: "dmotd" <dmotd at zapz.net>
Cc: <pd-list at iem.kug.ac.at>
Sent: Monday, March 24, 2003 1:32 AM
Subject: Re: [PD] video analysis II


> >  pdp has no analysis objects as such, but yves' pidip extention
> >  has a couple:
> >    pdp_ctrack     colour tracker, outputs the coordinates of a
> >                   colour(+luminosity) in a video stream..
> >    pdp_mgrid      outputs cell coordinates of a grid where motion
> >                   is detected..
> >
>
> just a hint:
>
> there is a "workaround" to analyze pictures by using pdp_scanxy~
> this object works like tabplay~, but it scans the luminocity channel of a
> video frame, instead of an array. it accepts coordinates as signal input.
> (0,0) is top left and (1,1) is bottom right. you could use a phasor~
> object to generate coordinates.
>
> if you use the audio output of pdp_scanxy~ in combination with env~ and
> some lop~ and hip~ objects, you can construct some very basic motion
> (hip) and intensity (lop) detection objects.
>
> tom
>
>
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