[GEM-dev] USB 3.0 camera and Gem

Cyrille Henry ch at chnry.net
Wed Apr 4 11:08:11 CEST 2012



Le 03/04/2012 20:17, Jack a écrit :
> Le 03/04/2012 12:38, Antoine Villeret a écrit :
>> the framerate is not limited by the rj45 extender but by the camera itself (in my case)
>> and i think the bandwidth of the extender is wide enough to transfer 120 fps @ 640x480
>> and you often can reduce the scan area of industrial camera sensor to increase framerate
>> for example a 640x480 sensor which outputs 90 fps can outputs 180 fps @ 320x240
>
> Yep, thanx for this precision Antoine.
> What is the category of the cable you use for the connection between the two RJ45 extender ?
> Your config is like that ? :
> camera <=> Firewire 400 cable <=> RJ45 extender <=> CAT6 cable <=> RJ45 extender <=> Firewire 400 cable <=> computer
yes

> or :
> camera <=> Firewire 400 cable <=> RJ45 extender <=> CAT6 cable <=> computer
no, the extender does not convert the FW protocol to ethernet protocol.
it just convert the FW electrical characteristic in order to send FW on a eternet cable. Fut it's still FW, so you can't connect this cable on a regular eternet plug.

++c



> ++
>
> Jack
>
>
>>
>> ++
>> a
>>
>>
>> Le 3 avril 2012 11:34, Jack <jack at rybn.org <mailto:jack at rybn.org>> a écrit :
>>
>>     Le 02/04/2012 09:48, Antoine Villeret a écrit :
>>>     hi,
>>>
>>>     i got 60 fps in 640x480 / grayscale which is the default image configuration and the more bandwith expensive for this camera
>>>
>>>
>>>     ++
>>>     a
>>>
>>>
>>>
>>>
>>>
>>>     --
>>>     do it yourself
>>>     http://antoine.villeret.free.fr
>>>     http://drii.ensad.fr
>>>     --
>>>     Google lit ce mail...
>>>     si vous refusez cela, utilisez l'adresse antoine.villeret [at] free.fr <http://free.fr> pour me contacter
>>>
>>>
>>>
>>>     Le 1 avril 2012 15:42, Jack <jack at rybn.org <mailto:jack at rybn.org>> a écrit :
>>>
>>>         Le 01/04/2012 14:18, Antoine Villeret a écrit :
>>>>         hi jack,
>>>>
>>>>         i'm using a firewire 400 over RJ45 extender (from AVT) on a tour with an AVT Guppy
>>>>         it's work fine with 50m cable, it should work at least until 100m but i never tried
>>>>         it's not possible to use switch to increase the distance with this kind of extender
>>>>
>>>>         you can use certain switches with GigE but it increases latency i think
>>>>
>>>>         another solution for very long distance (more than 100m) is the optical fiber
>>>>         you can find some firewire over optical fiber extender
>>>>
>>>>         Basler made a technical report on industrial cameras interface here :
>>>>         http://www.i2s-vision.fr/upload/BAS1108_Interfaces.pdf
>>>>
>>>>         hope this helps
>>>>
>>>>         ++
>>>>         a.
>>>>         --
>>>>         do it yourself
>>>>         http://antoine.villeret.free.fr
>>>>         http://drii.ensad.fr
>>>>         --
>>>>         Google lit ce mail...
>>>>         si vous refusez cela, utilisez l'adresse antoine.villeret [at] free.fr <http://free.fr> pour me contacter
>>>>
>>>>
>>>>
>>>>         Le 1 avril 2012 13:56, Jack <jack at rybn.org <mailto:jack at rybn.org>> a écrit :
>>>>
>>>>             Le 01/04/2012 02:22, Max a écrit :
>>>>
>>>>                 Am 01.04.2012 um 01:53 schrieb Jack:
>>>>
>>>>                     PS : does anybody tried an other solution (like GigE or USB<->Ethernet<->USB) with Gem when you need long distance between camera and computer ? Is it very stable ?
>>>>
>>>>                 I could offer vnc access to a os x or ubuntu machine hooked up to either a Allied Vision Tech GigE or Firewire 800 camera.
>>>>
>>>>                 m.
>>>>
>>>>
>>>>             Hello Max,
>>>>
>>>>             Did you ever tried that solution ?
>>>>             Is it appropriate to detect very small movement and is it enough fast to be used in real time (not to much latency ?) ?
>>>>             ++
>>>>
>>>>             Jack
>>>>
>>>>
>>>>
>>>>             _______________________________________________
>>>>             GEM-dev mailing list
>>>>             GEM-dev at iem.at <mailto:GEM-dev at iem.at>
>>>>             http://lists.puredata.info/listinfo/gem-dev
>>>>
>>>>
>>>
>>>         Hello Antoine,
>>>
>>>         Thanx to share your configuration and the Basler technical report, it is a useful document.
>>>         What is the resolution the framerate you get on your computer from your camera with that configuration ?
>>>         ++
>>>
>>>         Jack
>>>
>>>
>>>
>>
>>     OK. I would prefer a camera with 640x480 pixels at 120 fps minimum to be more precise in the detection of very small movements.
>>     ++
>>
>>     Jack
>>
>>
>>
>
>
>
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