Motion tracking can be done easily in GEM with a combination of
[pix-background] to create a histrogram showing only changed pixel
values, and [pix_blob] to track the center of gravity of those changed
values.
D.
On 12/7/10 6:43 PM, Jose Luis Santorcuato wrote:
I don't quite understand why people do motion detection with squares
like that. I use a generic motion detection that gets me the centre of
the motion, and then when I rescale the values, it may split the
possible results into bands or squares because of rounding (if I
quantise them).
Hi all!,
what is the generic motion detector you are using Mathieu? I use pdp...
Best Regards
José
2010/12/7 Mathieu Bouchard <[email protected] <mailto:[email protected]>>:
> On Tue, 7 Dec 2010, Pagano, Patrick wrote:
>
>> pdp_mgrid
>
> I don't quite understand why people do motion detection with squares like
> that. I use a generic motion detection that gets me the centre of the
> motion, and then when I rescale the values, it may split the possible
> results into bands or squares because of rounding (if I quantise them).
>
> Nevertheless, if I have a picture of size (240 320 3), I can make
groups of
> rows and columns, for example I [#redim (15 16 20 16 3)], which turns a
> picture into a 5-dimensional grid, and then if I [#transpose 1 2], I will
> have a 5-dimensional grid that is a 2-dimensional grid of 16x16
icons. After
> that, many effects and analyses that GF can do on pictures will also
work on
> such groups of pictures without any change.
>
> But more simply, if I want an average of each 16x16 icon, I don't
need to go
> 5-dimensional, I can just do [#downscale_by 16 smoothly] and that's all.
>
>> pdp_cmap
>> pdp_ctrack
>> pdp_ascii
>> are essential
>
> I'd like to know what it takes for you to call something «essential».
Do you
> mean that there is no other way to do it with Pd, or just no other
way to do
> with with PDP ?
>
>> pdp_qt will be obsolete when we get either pix_film OR pix_movie or
>> whatever to play audio directly from a movie without extra table banging
>> [hopefully this exists somewhere]
>
> There's [#in~], which is rather experimental. It uses [#to~].
>
> _______________________________________________________________________
> | Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC
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