Re: [PD] pd and openCV

[Mathieu Bouchard]

On Fri, 2 Oct 2009, Mathieu Bouchard wrote:

On Fri, 2 Oct 2009, Loic Kessous wrote:

well, for those interested...but maybe it's a dev subject...
Ow... endless potential for nameclashes with GridFlow... maybe there is no 
clash now, but as both projects use the "cv." prefix together with names 
spelt exactly as in the original OpenCV, it looks like there will be more 
clashes in the future.


Ok, I changed it to the "cv/#" prefix.

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Re: [PD] pd and openCV

[Loic Kessous]

I understand your point of view, but I am more interested buy the  
approach than the implementation itself.
I mean passing a pointer and not the image itself. That's why it's  
compiled as a dll library I suppose, and I wonder how using another  
solution

as shared memory for example could be done in the same goal...
loic

Well, I must say that after recompiling it on windows, I didn't really  
try deeper too on linux or os X.I will try too.

I don't exactly know how Windows dependent it is.
according to the code not so much, but it uses msvc as compiler if I  
well remember.

On 3 oct. 09, at 12:25, ydego...@gmail.com wrote:


Loic Kessous wrote:

well, for those interested...but maybe it's a dev subject...


On 2 oct. 09, at 18:46, ydego...@gmail.com  
 wrote:




estimado Loic,

i don't have an idea of what you men by 'Jean Yves implementation'.
i never saw it posted anywhere
and where is the code?



 here is Jean-Yves's stuff,it has been posted on the pd-list :


 Projet /CVlib/ : openCV (computer vision lib) dans /pure data/ |
 Free *...* 

- [ Translate this page  ]
21 fév 2009 *...* Le projet /CvLib/ consiste en un framework de  
développement multiplateformes pour faciliter l'implémentation  
dans /Pure Data/ des *...*
s184785159.onlinehome.fr/drupal/?q=node/167 - Cached  - Similar 

i


well sorry i did not considered it as it doesn't compile on linux,
and no effort was made to make it work there.

i don't know why we should always make the effort to make our stuff
made on linux working on windows,
and windows people never do the effort ...

massalami,
sevy



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Re: [PD] pd and openCV

[ydego...@gmail.com]

Loic Kessous wrote:

well, for those interested...but maybe it's a dev subject...


On 2 oct. 09, at 18:46, ydego...@gmail.com  
wrote:




estimado Loic,

i don't have an idea of what you men by 'Jean Yves implementation'.
i never saw it posted anywhere
and where is the code?



  here is Jean-Yves's stuff,it has been posted on the pd-list :


  Projet /CVlib/ : openCV (computer vision lib) dans /pure data/ |
  Free *...* 

 - [ Translate this page 
 ] 

21 fév 2009 *...* Le projet /CvLib/ consiste en un framework de 
développement multiplateformes pour faciliter l'implémentation 
dans /Pure Data/ des *...*
s184785159.onlinehome.fr/drupal/?q=node/167 - Cached 
 - Similar 


i


well sorry i did not considered it as it doesn't compile on linux,
and no effort was made to make it work there.

i don't know why we should always make the effort to make our stuff
made on linux working on windows,
and windows people never do the effort ...

massalami,
sevy

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Re: [PD] pd and openCV

[Mathieu Bouchard]

On Fri, 2 Oct 2009, Loic Kessous wrote:


well, for those interested...but maybe it's a dev subject...


Ow... endless potential for nameclashes with GridFlow... maybe there is 
no clash now, but as both projects use the "cv." prefix together with 
names spelt exactly as in the original OpenCV, it looks like there will be 
more clashes in the future.


(at the moment, GridFlow supports very few OpenCV features.)

I will think about a renaming.

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Re: [PD] pd and openCV

[Loic Kessous]

well, for those interested...but maybe it's a dev subject...


On 2 oct. 09, at 18:46, ydego...@gmail.com wrote:



estimado Loic,

i don't have an idea of what you men by 'Jean Yves implementation'.
i never saw it posted anywhere
and where is the code?


here is Jean-Yves's stuff,it has been posted on the pd-list :

Projet CVlib : openCV (computer vision lib) dans pure data | Free ...  
- [ Translate this page ]
21 fév 2009 ... Le projet CvLib consiste en un framework de  
développement multiplateformes pour faciliter l'implémentation dans  
Pure Data des ...

s184785159.onlinehome.fr/drupal/?q=node/167 - Cached - Similar
i



apart from this we try to make things easy for the people
and not a head-breaking library like gridflow is.
and that can only be used by scientifics..


yes, I see, this is an important thing, of course.


tom schouten already went  in that direction
and i totally disagree with it


what do you mean by this? are you talking about pdp? Is pdp send a   
pointer from one external to another ?


later,
loic



ciao,
sevy

Loic Kessous wrote:

Dear Lluis and Yves,

I'm reading your paper about openCV from the pdconf, and I was  
thinking about a few things that I'd like to share with you.


Some month ago I work on a project with pd and openCV and I observe  
that there was quit different approaches...


with different advantage regarding platforms and implementations,  
including the use of flext o not apparently also.


I recompiled and test for different purposes those different ones:  
pix_ , pdp_ and the one from Jean-Yves Gratius, and also some new  
experiment from myself (which the idea was to use openCV for  
display and video acquisition, this works more or less depending on  
the platform and configuration).


...this on MSW, Ubuntu and os X..., which tend to show that the  
cross-platform issue is not so obvious :)


one very interesting thing with Jean-Yves approach is that from one  
external to another only a pointer (the one of the OpenCV image) is  
passed, and not the full image as (except if I'm confusing) with  
pix_ or pdp_ . But this need  to compile the external as a full  
library (well it is like this in his implementation, I don't know  
if there is a issue to avoid this), and understanding the code and  
writing new codes is diiferent, I would say more complicated.
This may make things more complicated for people who want to  
improve the library but just want to add new externals and not deal  
with all the lib.


He use code:block to compile it, which is both a advantage and an  
inconvenient:
it took me more sometime to understand it, make link to flex, pd,  
gem...but then it is in a way comfortable, and it is cross-platform.


I wonder if it should not be possible to keep the idea to pass only  
the openCV image pointer (much more efficient) but using an  
approach closer to pix_ or pdp_ . From another project, I heard  
that there was some work about using shared memory in max and pd  
for similar issue. do you have any idea about this?


Best,

Loïc







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