[PD] video analysis II

[dmotd]

hi.. 

 gem's video analysis objects: 
   pix_blob       the weight (size) of a colour in an image stream..
   pix_histo      output the RGBA density of a stream  to a table..
   pix_dump       output RGBA values of a frame as a list..
   pix_pix2sig~   convert RBBA channels to audio signals..
 used in combination with:
   pix_threshold  threshold filter..
   rgb2hsv        convert RGB values to HSV colourspace..
 may get you somewhere.. pix_dump is particularly useful for
 analysis as you can interpret each frame anyway you like, i used
 it in combination with the matrix objects from the zexy library, 
 but beware it can be processor intensive.. there are probably many 
 more analysis objects in the gem CVS?

 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..
 
 and of course there's yves' pdp2gem/gem2pdp bridge objects for the
 best of both worlds..

 if you don't have Xfree 4.x, then you won't have xv output, 
 either upgrade X or download the sdl library, recompile pdp 
 and use pdp_sdl for pdp output.
   
 enjoy!
dmotd

On Sun, Mar 23, 2003 at 04:15:48PM +0100, marius schebella wrote:
> hi,
> could someone point me to some basics in understanding of video signal. i
> need to analyze a video input signal very roughly, like
> brightness/luminosity of black/white in low resolution an framerate (some
> frames per second). actually i want to detect changes or movement through
> the picture/screen.
> i have installed gem and pdp, but don't know all the objects yet. later it
> is also important, that i will be able to run the patch in -nogui mode,
> because the cpu is quite old and slow and i need all available resources. i
> think Gem is not working then???
> hardware is working fine (though slow, 200MHz, for video input i use a
> win-tv card), only my "know how" is poor : (
> btw some objects of pdp cannot be created (pdp_blur, pdp_motion_phase).
> should i change to a newer version? now i am using 0.10.1. and last
> question: pdp_xv shows an error: no xv port available. is this a software
> problem, or does my tv-card not support this?
> 
> thnx in advance, marius.
> 
> 
> 
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