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  #1 (permalink)  
Old 08-16-2005, 02:06 PM
Bob
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Default image sensor

Hi does anybody have a design example of an image sensor connected to
programmable logic with HDL code?

I want to try this. I have not committed any hardware yet so a working
example would be a great starting point.

Mostly concerned with the physical connections and image sensor low
level interface code.
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  #2 (permalink)  
Old 08-16-2005, 02:56 PM
Gabor
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Default Re: image sensor


Bob wrote:
> Hi does anybody have a design example of an image sensor connected to
> programmable logic with HDL code?
>
> I want to try this. I have not committed any hardware yet so a working
> example would be a great starting point.
>
> Mostly concerned with the physical connections and image sensor low
> level interface code.


Have you already picked out a sensor?
There are as many interface models as there are sensors (almost).

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  #3 (permalink)  
Old 08-16-2005, 05:18 PM
james
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Default Re: image sensor

On Tue, 16 Aug 2005 09:06:10 -0400, Bob <[email protected]> wrote:

>+<Hi does anybody have a design example of an image sensor connected to
>+<programmable logic with HDL code?
>+<
>+<I want to try this. I have not committed any hardware yet so a working
>+<example would be a great starting point.
>+<
>+<Mostly concerned with the physical connections and image sensor low
>+<level interface code.

******

FIrst off you are ging to have to decide on type. Frame Transfer,
progressive scan or CMOS imager. Each one has their advantages and
disadvantages. External clock generation will differ with each. FOr
the most part the Frame Tranfer Imagers, mostly TI, have large gate
capacitances and the clock source for these chips are not drivable
from a FPGA. Peak currents to the SAG and IAG of the TI chips can be
in the range of 1 amp.

All imagers will clock each pixel out serially, that analog output is
then fed to an ADC. You can bin adjacent pixels to form larger pixels
and even bin rows to increase pixel size. SOme imagers allow this to
be done internal to the chip.

Then you need to determine what application this camera is used for.
Still pictures using fast integration times, slow integration times,
or video and how many FPS you want.

Each type of imager requires it own unique interface. So decide from
which type depending on apllication needs and then start thinking of
what circuits are needed around the imager.

james
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  #4 (permalink)  
Old 08-16-2005, 07:14 PM
Bob
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Default image sensor

On Tue, 16 Aug 2005 16:18:45 GMT, james <[email protected]> wrote:

>On Tue, 16 Aug 2005 09:06:10 -0400, Bob <[email protected]> wrote:
>
>>+<Hi does anybody have a design example of an image sensor connected to
>>+<programmable logic with HDL code?
>>+<
>>+<I want to try this. I have not committed any hardware yet so a working
>>+<example would be a great starting point.
>>+<
>>+<Mostly concerned with the physical connections and image sensor low
>>+<level interface code.

>******
>
>FIrst off you are ging to have to decide on type. Frame Transfer,
>progressive scan or CMOS imager. Each one has their advantages and
>disadvantages. External clock generation will differ with each. FOr
>the most part the Frame Tranfer Imagers, mostly TI, have large gate
>capacitances and the clock source for these chips are not drivable
>from a FPGA. Peak currents to the SAG and IAG of the TI chips can be
>in the range of 1 amp.
>
>All imagers will clock each pixel out serially, that analog output is
>then fed to an ADC. You can bin adjacent pixels to form larger pixels
>and even bin rows to increase pixel size. SOme imagers allow this to
>be done internal to the chip.
>
>Then you need to determine what application this camera is used for.
>Still pictures using fast integration times, slow integration times,
>or video and how many FPS you want.
>
>Each type of imager requires it own unique interface. So decide from
>which type depending on apllication needs and then start thinking of
>what circuits are needed around the imager.
>
>james


I am looking for somthing realativly simple. I would like to keep the
power and complexity low. Frame rate is not very important to me.
I mostly want to learn so books, design examples app notes or your own
finished designs woould be great.
so simple cheep low power and low cost would be the driving factors.

I have found some stuff with google and am reading it now.
I looked at kodak and Micron web sites, but they dont have pricing or
avalibility on their sensors so other than looking at data sheets they
were not much help.
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  #5 (permalink)  
Old 08-16-2005, 08:44 PM
Mike Treseler
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Default Re: image sensor

Bob wrote:

> I have found some stuff with google and am reading it now.
> I looked at kodak and Micron web sites, but they dont have pricing or
> avalibility on their sensors so other than looking at data sheets they
> were not much help.


http://www.google.com/search?q=image...ce+design+fpga

-- Mike Treseler
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  #6 (permalink)  
Old 08-17-2005, 06:15 AM
Jerome
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Default Re: image sensor

Hi,
Check http://www.xess.com/ho03000.html
Digital Camera Interface
"Bob" <[email protected]> a écrit dans le message de
news:[email protected]
> Hi does anybody have a design example of an image sensor connected to
> programmable logic with HDL code?
>
> I want to try this. I have not committed any hardware yet so a working
> example would be a great starting point.
>
> Mostly concerned with the physical connections and image sensor low
> level interface code.



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