Reply by Ulf Samuelsson●January 10, 20112011-01-10
On Mon, 10 Jan 2011 12:55:53 -0800 (PST), linnix
<me@linnix.info-for.us> wrote:
> On Jan 10, 12:13�pm, Ulf Samuelsson <u...@a-t-m-e-l.com> wrote:
> > Paul skrev:
> > > In article <wsCdnQNlQoTe3bbQnZ2dnUVZ_h2dn...@giganews.com>,
cerbero85
> > > @n_o_s_p_a_m.gmail.com says...
> > >> Hi, all.
> >
> > >> I changed the project for the university and now I have some
time to
> > >> continued this (for my personal interest).
> >
> > >> The specifications of the camera are summarized below:
> >
> > >> - 400x400 pixel
> > >> - 30FPS
> > >> - output 10/8bit (I decide to use only 8bit)
> > >> - the output format is RAW (the software make the color
interpolation)
> >
> > >> So the one frame have a 400x400x1byte = 160KByte (RAW Image)
> >
> > >> At 30fps that is 4.8MByte per second = 38.4Mbps
> >
> > > For a monochrome image yes.
> >
> > >> My goal is find a chip that send the camera's frame to the pc
over
> > > USB2.0
> > You can do this with a modern ARM processor, like the AT91SAM9G45.
> > It has both High Speed USB as well as a camera interface.
> Yes, that will work. Just want to point out that this is a 400MHz
> processor in 324 balls BGA.
That is why I provided a link to a DIMM Module w flash and DRAM
Ulf
--
Best Regards,
Ulf Samuelsson
Reply by Arlet Ottens●January 10, 20112011-01-10
On Mon, 10 Jan 2011 11:22:11 -0600, cerbero85 wrote:
> Hi, all.
>
> I changed the project for the university and now I have some time to
> continued this (for my personal interest).
>
> The specifications of the camera are summarized below:
>
> - 400x400 pixel
> - 30FPS
> - output 10/8bit (I decide to use only 8bit) - the output format is RAW
> (the software make the color interpolation)
>
> So the one frame have a 400x400x1byte = 160KByte (RAW Image)
>
> At 30fps that is 4.8MByte per second = 38.4Mbps
>
>
> My goal is find a chip that send the camera's frame to the pc over
> USB2.0 .
> For this I understand (thanks Paul and linnix) that is not possible send
> directely the frame to USB for the time latency.
>
> So I need a buffer (FIFO or DRAM).
A small FPGA + SRAM (or SDRAM) + USB PHY would work, but not the easiest
solution to implement without prior experience.
Reply by linnix●January 10, 20112011-01-10
On Jan 10, 12:13=A0pm, Ulf Samuelsson <u...@a-t-m-e-l.com> wrote:
> Paul skrev:
>
>
>
> > In article <wsCdnQNlQoTe3bbQnZ2dnUVZ_h2dn...@giganews.com>, cerbero85
> > @n_o_s_p_a_m.gmail.com says...
> >> Hi, all.
>
> >> I changed the project for the university and now I have some time to
> >> continued this (for my personal interest).
>
> >> The specifications of the camera are summarized below:
>
> >> - 400x400 pixel
> >> - 30FPS
> >> - output 10/8bit (I decide to use only 8bit)
> >> - the output format is RAW (the software make the color interpolation)
>
> >> So the one frame have a 400x400x1byte =3D 160KByte (RAW Image)
>
> >> At 30fps that is 4.8MByte per second =3D 38.4Mbps
>
> > For a monochrome image yes.
>
> >> My goal is find a chip that send the camera's frame to the pc over
> > USB2.0
>
> You can do this with a modern ARM processor, like the AT91SAM9G45.
> It has both High Speed USB as well as a camera interface.
>
Yes, that will work. Just want to point out that this is a 400MHz
processor in 324 balls BGA.
Reply by Ulf Samuelsson●January 10, 20112011-01-10
Paul skrev:
> In article <wsCdnQNlQoTe3bbQnZ2dnUVZ_h2dnZ2d@giganews.com>, cerbero85
> @n_o_s_p_a_m.gmail.com says...
>> Hi, all.
>>
>> I changed the project for the university and now I have some time to
>> continued this (for my personal interest).
>>
>> The specifications of the camera are summarized below:
>>
>> - 400x400 pixel
>> - 30FPS
>> - output 10/8bit (I decide to use only 8bit)
>> - the output format is RAW (the software make the color interpolation)
>>
>> So the one frame have a 400x400x1byte = 160KByte (RAW Image)
>>
>> At 30fps that is 4.8MByte per second = 38.4Mbps
>
> For a monochrome image yes.
>
>> My goal is find a chip that send the camera's frame to the pc over
> USB2.0
You can do this with a modern ARM processor, like the AT91SAM9G45.
It has both High Speed USB as well as a camera interface.
You can get a SAM9G45 CPU module from www.ronetix.at.
>
> If nothing else look at USB slave device micros or even FTDI FT42232H or
> whatever their latest offering is as this has a FIFO interface and
> claims to be able to acheive full 480Mbps data rates.
>
>> .
>> For this I understand (thanks Paul and linnix) that is not possible send
>> directely the frame to USB for the time latency.
>>
>> So I need a buffer (FIFO or DRAM).
>>
>>
>> I have read some tutorial of usb protocol, but I don't understand very
>> well.
>>
>> If I use the USB in Full Speed (12Mbps) isochronous mode, a device can send
>> a maximum of 1023 Bytes during a "frame" (each "frame" is 1ms).
>
> Look at USB 2 and High Speed (480 Mbps), in whic the frame time is
> somewhat quicker.
>
>> The camera produce data to 160 KByte, so the job of the buffer is store the
>> data and then sent it to the usb in packets of 1023 Byte each 1ms, is
>> right??
>
> Yes that is teh job of the FIFO. But you will get behind and not acheive
> 30fps at 12Mbps USB.
>> In your opinion why some projects (for example CMUcam and AVRcam) use the
>> RS232 connector for connect the camera to a pc and not usb?
>
> USB was not around for the original CMUcam most of these cameras cannot
> achieve 30fps.
>
>
--
Best Regards
Ulf Samuelsson
These are my own personal opinions, which may
or may not be shared by my employer Atmel Nordic AB
Reply by Ulf Samuelsson●January 10, 20112011-01-10
Paul skrev:
> In article <wsCdnQNlQoTe3bbQnZ2dnUVZ_h2dnZ2d@giganews.com>, cerbero85
> @n_o_s_p_a_m.gmail.com says...
>> Hi, all.
>>
>> I changed the project for the university and now I have some time to
>> continued this (for my personal interest).
>>
>> The specifications of the camera are summarized below:
>>
>> - 400x400 pixel
>> - 30FPS
>> - output 10/8bit (I decide to use only 8bit)
>> - the output format is RAW (the software make the color interpolation)
>>
>> So the one frame have a 400x400x1byte = 160KByte (RAW Image)
>>
>> At 30fps that is 4.8MByte per second = 38.4Mbps
>
> For a monochrome image yes.
>
>> My goal is find a chip that send the camera's frame to the pc over
> USB2.0
You can do this with a modern ARM processor, like the AT91SAM9G45.
It has both High Speed USB as well as a camera interface.
You can get a SAM9G45 CPU module from www.ronetix.at.
>
> If nothing else look at USB slave device micros or even FTDI FT42232H or
> whatever their latest offering is as this has a FIFO interface and
> claims to be able to acheive full 480Mbps data rates.
>
>> .
>> For this I understand (thanks Paul and linnix) that is not possible send
>> directely the frame to USB for the time latency.
>>
>> So I need a buffer (FIFO or DRAM).
>>
>>
>> I have read some tutorial of usb protocol, but I don't understand very
>> well.
>>
>> If I use the USB in Full Speed (12Mbps) isochronous mode, a device can send
>> a maximum of 1023 Bytes during a "frame" (each "frame" is 1ms).
>
> Look at USB 2 and High Speed (480 Mbps), in whic the frame time is
> somewhat quicker.
>
>> The camera produce data to 160 KByte, so the job of the buffer is store the
>> data and then sent it to the usb in packets of 1023 Byte each 1ms, is
>> right??
>
> Yes that is teh job of the FIFO. But you will get behind and not acheive
> 30fps at 12Mbps USB.
>> In your opinion why some projects (for example CMUcam and AVRcam) use the
>> RS232 connector for connect the camera to a pc and not usb?
>
> USB was not around for the original CMUcam most of these cameras cannot
> achieve 30fps.
>
>
--
Best Regards
Ulf Samuelsson
These are my own personal opinions, which may
or may not be shared by my employer Atmel Nordic AB
Reply by Paul●January 10, 20112011-01-10
In article <wsCdnQNlQoTe3bbQnZ2dnUVZ_h2dnZ2d@giganews.com>, cerbero85
@n_o_s_p_a_m.gmail.com says...
>
> Hi, all.
>
> I changed the project for the university and now I have some time to
> continued this (for my personal interest).
>
> The specifications of the camera are summarized below:
>
> - 400x400 pixel
> - 30FPS
> - output 10/8bit (I decide to use only 8bit)
> - the output format is RAW (the software make the color interpolation)
>
> So the one frame have a 400x400x1byte = 160KByte (RAW Image)
>
> At 30fps that is 4.8MByte per second = 38.4Mbps
For a monochrome image yes.
> My goal is find a chip that send the camera's frame to the pc over
USB2.0
If nothing else look at USB slave device micros or even FTDI FT42232H or
whatever their latest offering is as this has a FIFO interface and
claims to be able to acheive full 480Mbps data rates.
> .
> For this I understand (thanks Paul and linnix) that is not possible send
> directely the frame to USB for the time latency.
>
> So I need a buffer (FIFO or DRAM).
>
>
> I have read some tutorial of usb protocol, but I don't understand very
> well.
>
> If I use the USB in Full Speed (12Mbps) isochronous mode, a device can send
> a maximum of 1023 Bytes during a "frame" (each "frame" is 1ms).
Look at USB 2 and High Speed (480 Mbps), in whic the frame time is
somewhat quicker.
>
> The camera produce data to 160 KByte, so the job of the buffer is store the
> data and then sent it to the usb in packets of 1023 Byte each 1ms, is
> right??
Yes that is teh job of the FIFO. But you will get behind and not acheive
30fps at 12Mbps USB.
>
> In your opinion why some projects (for example CMUcam and AVRcam) use the
> RS232 connector for connect the camera to a pc and not usb?
Hi, all.
I changed the project for the university and now I have some time to
continued this (for my personal interest).
The specifications of the camera are summarized below:
- 400x400 pixel
- 30FPS
- output 10/8bit (I decide to use only 8bit)
- the output format is RAW (the software make the color interpolation)
So the one frame have a 400x400x1byte = 160KByte (RAW Image)
At 30fps that is 4.8MByte per second = 38.4Mbps
My goal is find a chip that send the camera's frame to the pc over USB2.0
.
For this I understand (thanks Paul and linnix) that is not possible send
directely the frame to USB for the time latency.
So I need a buffer (FIFO or DRAM).
I have read some tutorial of usb protocol, but I don't understand very
well.
If I use the USB in Full Speed (12Mbps) isochronous mode, a device can send
a maximum of 1023 Bytes during a "frame" (each "frame" is 1ms).
The camera produce data to 160 KByte, so the job of the buffer is store the
data and then sent it to the usb in packets of 1023 Byte each 1ms, is
right??
In your opinion why some projects (for example CMUcam and AVRcam) use the
RS232 connector for connect the camera to a pc and not usb?
---------------------------------------
Posted through http://www.EmbeddedRelated.com
Reply by Rich Webb●November 4, 20102010-11-04
On Thu, 4 Nov 2010 11:39:21 -0700 (PDT), linnix <me@linnix.info-for.us>
wrote:
>On Nov 3, 3:24�pm, Paul <p...@pcserviceselectronics.co.uk> wrote:
>> In article <xLadnfBSLN8Ky0zRnZ2dnUVZ_uydn...@giganews.com>, cerbero85
>> @n_o_s_p_a_m.gmail.com says...
>>
>>
>>
>> > Thanks for the replies
>>
>> > >In article <g8-dnVaMyNriiVLRnZ2dnUVZ_q2dn...@giganews.com>, cerbero85
>> > >@n_o_s_p_a_m.gmail.com says...
>>
>> > >Sounds like a student project.
>>
>> > Yes.. and I have available a low budget.
>>
>> So think about the data flows.
>>
>> > >Do you want a single frame, every second or third or... frame or all
>> > >frames?
>>
>> > Full frames (400x400 pixel to 30FPS)
>>
>> So single frame to 30fps, where a frame is 400 x 400 (160000 pixels)
>
>So, you (OP) are getting into mpeg domain. It's probably cheaper and
>easier to get a mpeg encoded camera module.
Not in stock, but I did get (and play with) their earlier version C328.
<http://www.electronics123.com/s.nl/it.A/id.3010/.f> and there's an SPI
flavor as well. Not sure what the max frame rate is ...
--
Rich Webb Norfolk, VA
Reply by linnix●November 4, 20102010-11-04
On Nov 3, 3:24=A0pm, Paul <p...@pcserviceselectronics.co.uk> wrote:
> In article <xLadnfBSLN8Ky0zRnZ2dnUVZ_uydn...@giganews.com>, cerbero85
> @n_o_s_p_a_m.gmail.com says...
>
>
>
> > Thanks for the replies
>
> > >In article <g8-dnVaMyNriiVLRnZ2dnUVZ_q2dn...@giganews.com>, cerbero85
> > >@n_o_s_p_a_m.gmail.com says...
>
> > >Sounds like a student project.
>
> > Yes.. and I have available a low budget.
>
> So think about the data flows.
>
> > >Do you want a single frame, every second or third or... frame or all
> > >frames?
>
> > Full frames (400x400 pixel to 30FPS)
>
> So single frame to 30fps, where a frame is 400 x 400 (160000 pixels)
So, you (OP) are getting into mpeg domain. It's probably cheaper and
easier to get a mpeg encoded camera module.
Reply by Paul●November 4, 20102010-11-04
Further thoughts.. (should not post with heavy head cold)
In article <xLadnfBSLN8Ky0zRnZ2dnUVZ_uydnZ2d@giganews.com>, cerbero85
@n_o_s_p_a_m.gmail.com says...
>
> Thanks for the replies
>
> >In article <g8-dnVaMyNriiVLRnZ2dnUVZ_q2dnZ2d@giganews.com>, cerbero85
> >@n_o_s_p_a_m.gmail.com says...
> >
> >Sounds like a student project.
>
> Yes.. and I have available a low budget.
>
> >
> >Do you want a single frame, every second or third or... frame or all
> >frames?
>
> Full frames (400x400 pixel to 30FPS)
>
>
> >Step one READ every part of the camera datasheet
> >
> >Step two work out the size in bytes/words the size of a whole image
> >frame. How fast the data is coming as it CANNOT be paused.
>
> I decided of use only 8bits. The camera frame rate is 30FPS.
As you said it was an Omnivision CMOS camera in first post, it
more than likely has digital o/ps unless you are using the older
analog parts. So the data formatting becomes important.