[Fwd: Re: [PD] mean color value of a video grid]

cyrille henry cyrille.henry at la-kitchen.fr
Thu Aug 24 14:17:08 CEST 2006


oups, forget to send to list


-------- Message original --------
Sujet: Re: [PD] mean color value of a video grid
Date: Thu, 24 Aug 2006 13:27:19 +0200
De: cyrille henry <cyrille.henry at la-kitchen.fr>
Pour: vincent rioux <vincent.rioux at no-log.org>
Références: <E92C0114-6601-4E4D-BAE3-EE1CD9FB778B at parisgraphics.com> 
<44ECB1AA.7060502 at goto10.org> 
<A6D82692-79FE-46B7-A516-9A02E72E0F75 at parisgraphics.com> 
<44ECF228.4010802 at goto10.org> 
<461640B5-9633-4346-9A8A-9E5337B56334 at parisgraphics.com> 
<44ED824F.40502 at no-log.org>

hello,

i think (but not tested) pix_resize should give better result.

pix_video
pix_resize 8 8
pix_mean_color

cyrille


vincent rioux a écrit :
> Dear list,
> I am searching for a solution to this problem :
> - given that a video stream - grey scale - is divided in say 8 
> rectangles-zones constituting a grid.
> - compute a time-varying mean value (over space) of the degree of 
> illumination (or shading) of each zone.
> 
> i am right now thinking of a combination of :
> 
> pix_video (to read a stream from a webcam e.g.)
> 8 pix_crop (to divide the image)
> pix_snap to take a snapshot as a picture.
> pix_mean_color to compute the mean value.
> 
> This should work but i am may be missing some more direct way of doing 
> this...
> Moreover would it be possible to compute these values on a more complex 
> shape than a rectangle?
> 
> as one can see, i will probably use Gem as it's the easiest to run and 
> install on osx but i wonder if it won't be easier or more 
> straightforward to code with gridflow or pdp?
> 
> 
> vincent
> 
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