On 25 May, 01:47, "David M. Palmer" <dmpal...@email.com> wrote:
> In article
> <4a62cdab-c53b-46fc-aa20-4e64737b4...@x35g2000hsb.googlegroups.com>,
>
> ratemonotonic <niladri1...@gmail.com> wrote:
> > Hi thankf for the response,
> > I am looking got a programmable board with a camera and a ethernet
> > interface is there anything available out there.
>
> If you want an Camera with a FPGA+CPU+100baseT solution, look at
> elphel.com
>
> --
> David M. Palmer dmpal...@email.com (formerly @clark.net, @ematic.com)
Also I have always wanted to learn about implemeting media DSP on FPGA.
Reply by ratemonotonic●May 25, 20082008-05-25
On 25 May, 01:47, "David M. Palmer" <dmpal...@email.com> wrote:
> In article
> <4a62cdab-c53b-46fc-aa20-4e64737b4...@x35g2000hsb.googlegroups.com>,
>
> ratemonotonic <niladri1...@gmail.com> wrote:
> > Hi thankf for the response,
> > I am looking got a programmable board with a camera and a ethernet
> > interface is there anything available out there.
>
> If you want an Camera with a FPGA+CPU+100baseT solution, look at
> elphel.com
>
> --
> David M. Palmer dmpal...@email.com (formerly @clark.net, @ematic.com)
This looks really good , Thanks.
Rate
Reply by David M. Palmer●May 24, 20082008-05-24
In article
<4a62cdab-c53b-46fc-aa20-4e64737b4447@x35g2000hsb.googlegroups.com>,
ratemonotonic <niladri1979@gmail.com> wrote:
> Hi thankf for the response,
> I am looking got a programmable board with a camera and a ethernet
> interface is there anything available out there.
If you want an Camera with a FPGA+CPU+100baseT solution, look at
elphel.com
--
David M. Palmer dmpalmer@email.com (formerly @clark.net, @ematic.com)
Reply by ●May 24, 20082008-05-24
> I am looking got a programmable board with a camera and a ethernet
> interface is there anything available out there.
Yes, but -
- Your best bet would be if you could find a 'product' that was known
to be reflashable, in the tradition of customized firmware on wrt54g
wifi gateways for example. I haven't heard of such, but it might
exist.
- I know that there are manufacturer evaluation platforms that combine
an ethernet-capable embedded processor with a camera. I think
there's one for the analog device blackfin for example. These are
intended to be the starting point for a product design effort so they
are programmable, but they aren't intended to be used as the product,
so they are serious money ($600 sticks in my mind).
- At those prices, cost wise a cheap laptop with built in web-cam, or
a USB-capable miniPC or embedded board plus a USB web cam could be
competitive on cost, though probably not on size. If you can get the
USB webcam itself to output an appropriate reslution/bandwidth data
stream, your embedded board might be able to just pass it on over the
ethernet without doing any compression.
Reply by ratemonotonic●May 24, 20082008-05-24
On 23 May, 16:03, Paul Keinanen <keina...@sci.fi> wrote:
> On Fri, 23 May 2008 06:06:05 -0700 (PDT), ratemonotonic
>
> <niladri1...@gmail.com> wrote:
> >I have a project to transmit video using wireless modems.
>
> There are wireless extenders for home audio/video applications.
>
> >One of the
> >modem will be connected via ethernet to a PC and the other end will be
> >connected to an ethernet camera. The modem connected to the ethernet
> >camera will transmit to the modem connected to the PC over the air.
>
> >I have searched for the internet and found some ethernet based
> >cameras , most of them seem to meet my requirements , but I would
> >never know the knitty gritty details/shortcommings of the cameras
> >untill i try them.
>
> There are video cameras intended for 10/100/1000baseT networks that
> are usually quite reliable.
>
> I assume that your wireless Ethernet modem is intended to carry
> reliably ethernet data (i.e using retransmissions) and hence not in
> real time or with predictable throughput.
>
> It appears that you are doing camera -- ethernet -- wireless --
> ethernet -- PC in which case it is possible that the wireless modems
> might add an other protocol layer for reliable wireless transmission
> around the ethernet protocol (such as TCP/IP).
>
> Since the wireless propagation delay or throughput is highly variable
> due to retransmissions, the transmitting modem will very quickly have
> a huge backlog of data, since the camera generates new data in real
> time, regardless if the modems can transfer in time to the other end.
>
> Do you expect to transfer compressed or uncompressed video data ?
>
> If uncompressed, it might be better to use just UDP in the ethernet
> and turn off any retransmissions in the wireless modems and expect
> that some UDP-frames are lost and reconstruct the missing lines from
> previous pictures. You need some message frame sequence numbering to
> know what frames are lost. The data will be delivered in real time and
> no backlogs can occur.
>
> I would not buy an Ethernet video camera from one vendor and the
> wireless modems from an other vendors, without proof that they will
> work together properly.
>
> Paul
Hi thankf for the response,
I am looking got a programmable board with a camera and a ethernet
interface is there anything available out there.
BR
Rate
Reply by Paul Keinanen●May 23, 20082008-05-23
On Fri, 23 May 2008 06:06:05 -0700 (PDT), ratemonotonic
<niladri1979@gmail.com> wrote:
>I have a project to transmit video using wireless modems.
There are wireless extenders for home audio/video applications.
>One of the
>modem will be connected via ethernet to a PC and the other end will be
>connected to an ethernet camera. The modem connected to the ethernet
>camera will transmit to the modem connected to the PC over the air.
>
>I have searched for the internet and found some ethernet based
>cameras , most of them seem to meet my requirements , but I would
>never know the knitty gritty details/shortcommings of the cameras
>untill i try them.
There are video cameras intended for 10/100/1000baseT networks that
are usually quite reliable.
I assume that your wireless Ethernet modem is intended to carry
reliably ethernet data (i.e using retransmissions) and hence not in
real time or with predictable throughput.
It appears that you are doing camera -- ethernet -- wireless --
ethernet -- PC in which case it is possible that the wireless modems
might add an other protocol layer for reliable wireless transmission
around the ethernet protocol (such as TCP/IP).
Since the wireless propagation delay or throughput is highly variable
due to retransmissions, the transmitting modem will very quickly have
a huge backlog of data, since the camera generates new data in real
time, regardless if the modems can transfer in time to the other end.
Do you expect to transfer compressed or uncompressed video data ?
If uncompressed, it might be better to use just UDP in the ethernet
and turn off any retransmissions in the wireless modems and expect
that some UDP-frames are lost and reconstruct the missing lines from
previous pictures. You need some message frame sequence numbering to
know what frames are lost. The data will be delivered in real time and
no backlogs can occur.
I would not buy an Ethernet video camera from one vendor and the
wireless modems from an other vendors, without proof that they will
work together properly.
Paul
Reply by Ico●May 23, 20082008-05-23
ratemonotonic <niladri1979@gmail.com> wrote:
> Hi all ,
>
> I have a project to transmit video using wireless modems. One of the
> modem will be connected via ethernet to a PC and the other end will be
> connected to an ethernet camera. The modem connected to the ethernet
> camera will transmit to the modem connected to the PC over the air.
>
> I have searched for the internet and found some ethernet based
> cameras , most of them seem to meet my requirements , but I would
> never know the knitty gritty details/shortcommings of the cameras
> untill i try them.
> Also all these cameras are black boxes with limited configurability.
> Are there any programmable ethernet cameras available?
>
> Has any one got any experiance with such devices?
About a year ago I evaluated a handful of IP-cameras for one of my
customers, and we found quality varies a *lot* between brands.
If you want image quality, standard protocols, configurability, good
documentation and support, and you have a few bucks to spare, go for the
Axis brand. (http://axis.com)
If you want to go cheap, with nonstandard protocols, IE6 support only,
no documentation and horrible GUI applications (like this:
http://zevv.nl/div/.old/haha.jpg), choose any cheap taiwanese brand.
Siemens also has some high-quality stuff, but all using propriatery
protocols for which you need their closed source libs for displaying or
recording video.
--
:wq
^X^Cy^K^X^C^C^C^C
Reply by ratemonotonic●May 23, 20082008-05-23
Hi all ,
I have a project to transmit video using wireless modems. One of the
modem will be connected via ethernet to a PC and the other end will be
connected to an ethernet camera. The modem connected to the ethernet
camera will transmit to the modem connected to the PC over the air.
I have searched for the internet and found some ethernet based
cameras , most of them seem to meet my requirements , but I would
never know the knitty gritty details/shortcommings of the cameras
untill i try them.
Also all these cameras are black boxes with limited configurability.
Are there any programmable ethernet cameras available?
Has any one got any experiance with such devices?
Any suggestions will be apperciated.
BR
Rate