[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
>>>>
>>>>
>>>>
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>>>>
>>>>
>>>
>>> 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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