[PD] Computer Vision with Pure Data

[peter venus]

Hello Jonathan!

as i understand it, you want to track only a hand.

i don´t know if you know about the Leap Motion Controller[1].
This one is specialized to detect hands and from what i read in your 
mail, could really fit.
i have to admit, i havent played with it myself yet...but there is 
support for pd available [2].

if you want to stick to the pix_openCV library, have a look in the 
pix_opencv_example
01_opencv_contrours_boundingrect+pmpd_ambient.pd
if you leave out the physical modelling stuff, it is quite usable to 
track people, maybe hands as well.

If you want to or have to stick to a camera based tracking system, i 
could see some possible improvements:
as you say
 > The idea is to detect hands from an up-facing webcam in order to 
simulate a
 > camera on a touch pad.
if you really want to simulate the hand being tracked on a touchlike 
surface, why not add a semi-transparent plexiglass layer and place a 
camera underneath it, similar to the concept behind the reactable.

[1] https://www.leapmotion.com
[2] http://puredatajapan.info/?page_id=1514

regards,
peter


Am 05.12.14 01:12, schrieb Jonathan Aardestrup:
> Hello,
>
> I am working on a university project using Pure Data for computer vision in
> order to investigate possible advantages or disadvantages in a music
> related interaction context.
> The idea is to detect hands from an up-facing webcam in order to simulate a
> camera on a touch pad.
>
> I've spend some weeks to get familiar with the objects in Gem namely pix
> and pix_opencv, but even with objects such as pix_opencv_bgstats or
> pix_opencv_bgsubstract, alone or in combination with other objects, have I
> been able to get a clear binary image to detect motion from.
>
> If you could possibly have a look at my code and give me some hints to how
> I could improve it I would *really* appreciate it! Other suggestions are
> also most welcome!
>
> What I want it to do is detect hand (preferably without arm?) and give me
> the following readings:
> x-pos, y-pos, x-direction, y-direction,  x-acceleration, y-acceleration and
> blob size. x and y being for the center of the detected hand. Multiple
> blobs would also be great but I can't really understand how to use it so
> far.
>
> I've attached one out of many attempts for the right solution.
>
>
> I am using some objects from pix_opencv library which (in case you don't
> already have it) can be found here:
>
> http://giss.tv/wiki/index.php/Opencv_for_PD#DOWNLOAD_.26_INSTALL
> <https://mail.aau.dk/owa/redir.aspx?C=AfeyM9F6NEuKyXWfCaqyUJjUEYZM49EIDcxZaejZJa5vTByqA8HawMFTHijqhA-X2zxf8U4Y1A4.&URL=http%3a%2f%2fgiss.tv%2fwiki%2findex.php%2fOpencv_for_PD%23DOWNLOAD_.26_INSTALL>
>
> The best
>
> Jonathan
>
>
>
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