[Elphel-support] binning modes, sum and average, how to change them?

Sat Oct 13 03:40:55 PDT 2012

cool, now I see the effect, now let me make a  couple of questions,

 1 - why the effect varies in the 1/4th decrement and the 1/8th decrement?
      in 1/1th (no binning) there's no light increment (that's logical)
      in 1/2th and 1/3th there is one light increment (ok)
      in 1/4th there is a super light increment (why?)
      between 1/5th and  1/7th there is only one increment (ok)
      in 1/8th there is again a super light increment (why?)

 2 - this lights increment happen before any "gain" is applied to the
sensor signal isn't it?
      this means that this light increment doesn't add noise to the image
isn't it?

--------------------------------------------------

EXPOS shouldn't change with pixel-binning (by summing) I guess I could try
to match the light increment to an second EXPOS value while using only
pixel-binning (by averaging), by trying to match both a shot of the first
case, and a shot of the second case, and see the difference in exposure
time.

I'll try to find it later at night when I can control the light
environment...

2012/10/13 Oleg <support-list at support.elphel.com>

> Biel,
>
> What I meant with all this is to:
>> 1 - check out how much light do I gain from pixel binning (by suming) vs
>> pixel binning (by averaging)
>>
>
> So, you would want to read EXPOS parameter as well with autoexposure
> enabled, right? Or how do check?
>
>
>> 2 - get a way to control this difference between pixel binning methods
>>
>> once I get connected to the camera (where I can already use a script that
>> already controls a lot of parameters from the camera, and sets up the
>> camera to my liking)...
>>
>
>
>> what do I gain from typing?:
>
> wget "http://elphel/parsedit.php?DCM_HOR&DCM_VERT&BIN_HOR&BIN_VERT"
>>
>
> You get the response from that request - which equals to what you would
> see in the browser window. From your 1st letter I got it that you would
> like to read/set camera parameters from a command line.
>
> Resolent elphel (elphel)... 192.168.1.9
>> S'està connectant a elphel (elphel)|192.168.1.9|:80... conectat.
>> HTTP: Petició enviada, esperant resposta... 200 OK
>> *Longitud: no especificat [text/html]*
>> S'està desant a: «parsedit.php?DCM_HOR&DCM_VERT&BIN_HOR&BIN_VERT»
>
>     [ <=>                                   ] 9.182       --.-K/s   en
>> 0,01s
>> 2012-10-13 02:51:16 (779 KB/s) - s'ha desat
>> «parsedit.php?DCM_HOR&DCM_VERT&BIN_HOR&BIN_VERT» [9182]
>> "Longitud: no especificat [text/html]" translates as: "Longitude: not
>> specified [text/html]"
>> is this an error? it seems that it doesn't upload/download anything...
>>
>
> You need to add the 'immediate' key. My bad again. But you'll have to
> print the contents of the response if you would like to actually see the
> parameters values.
>
> Try the following:
> Create test.php:
>
>> <?
>> $r = file_get_contents("
>> http://192.168.0.9/parsedit.php?immediate&DCM_HOR&DCM_VERT&BIN_HOR&BIN_VERT&EXPOS
>> ");
>> echo $r;
>> ?>
>
>
> Then launch it from a browser:
>
>> http:/localhost/.../test.php
>
>  or a command line:
>
>> $php test.php
>
>
> In the command line you'll see something like:
>
>> <?xml version="1.0"?>
>> <parameters>
>>   <DCM_HOR>1</DCM_HOR>
>>   <DCM_VERT>1</DCM_VERT>
>>   <BIN_HOR>1</BIN_HOR>
>>   <BIN_VERT>1</BIN_VERT>
>>   <EXPOS>19883</EXPOS>
>> </parameters>
>
>
> If you specify values for the parameters they'll be applied. The response
> will read an old value though - so you would need to do one more read.
>
> shouldn't it be something like this?:
>>
>> wget "
>> http://elphel/parsedit.php?immediate&DCM_HOR=2&DCM_VERT=2&BIN_HOR=2&BIN_VERT=2<http://elphel/parsedit.php?DCM_HOR&DCM_VERT&BIN_HOR&BIN_VERT>
>> "
>> but this again only sets up skpping at half res. and pixel-binning "at
>> half res." (by avraging) isn't it?
>>
>
> Yes, that's correct.
>
> how do I get the luminous advantage of pixel binning (by summing)?
>>
>
> We don't have this setting in the upper level parameters. Do you have the
> datasheet for the sensor?
>
> I looked it up. You can switch between summing and averaging in register
> 0x20, bit 5.
>
> The commands from the camera terminal are:
> read:
>
>> fpcf -i2cr16 4820 1
>
> write:
>
>> fpcf -i2cw16 4820 0x60 - enable summing
>
> fpcf -i2cw16 4820 0x40 - switch back to averaging
>
>
> Where 0x[48] is the I2C sensor's address, 0x[20] - register address.
>
> You can connect to the camera through telnet. Or go http://elphel ->
> Terminal and type the commands there.
>
> This way of changing the sensor parameters will not be in sync with the
> frames' exposure period - so you might be getting a transitional broken
> frame(s).
>
> Best regards,
> Oleg Dzhimiev
> Electronics Engineer
> phone: +1 801 783 5555 x124
> Elphel, Inc.
>
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