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Raspberry Pi Forum raspberry Pi V3 camera module capture problem
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  • raspberrypicamerav3
Related

raspberry Pi V3 camera module capture problem

Beautiran
Beautiran over 2 years ago

Hi Everybody! I have been upgrading my 3D scanner from V2 to V3 camera modules from Raspberry Pi.

I upgraded to Bulleye to use the libcamera-still command and modified my node js program to reflect the new command line.

My system consist of 60 to 80 camera V3 connected to raspi zero W (the old one) that make a capture and send data when ordered by a server using node js.

The model stands at the center of the scanner that is a cylinder of 3m diameter with 5 rows of cameras on 10 to12 columns.

I have two problems:

The first that was already there but less strong with V2 is 7 to 8 darker bands over each picture that is due to LED lighting and rolling shutter I think.

the picture info give a shutter speed of 1/400 tha texplains the 8 bands at 50hz.

Do you have a recommendation for the best shutter speed or other setting to set to avoid that? 

The second is when the model is wearing fine pattern clothes I get a lot of chromatic aberration.

As the Aperture is fixed is their anything else I can do to solve that?

Thanks for any guidance or solution you could provide. 

Greetings.

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  • beacon_dave
    0 beacon_dave over 2 years ago
    Beautiran said:
    The second is when the model is wearing fine pattern clothes I get a lot of chromatic aberration.

    Sounds like Moiré interference patterns. Looks like it could be a bit more pronounced in the V3 module, judging by this comparison:

    https://youtu.be/8-yf_tId62o?t=123

    although really need to see the image at 1:1 scale to tell.

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  • beacon_dave
    0 beacon_dave over 2 years ago

    What lighting are you using ? Proper video lighting designed for this task ?

    You could perhaps try a range of different shutter speeds and compare the results to see what affect shutter speed has.

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  • bidrohini
    0 bidrohini over 2 years ago

    For the darker bands issue, you're correct that this is likely due to the LED lighting and rolling shutter. One solution would be to switch to continuous lighting instead of LED lighting to eliminate the banding caused by the LED flicker.

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  • beacon_dave
    0 beacon_dave over 2 years ago

    There was a light flicker meter project here on element14 a while ago which might be of some use if investigating alternative light sources
    /challenges-projects/project14/photonics/b/blog/posts/simple-light-flicker-meter 

    Derek also did a tutorial on driving LEDs with a constant current source which may also be of interest
    /challenges-projects/element14-presents/dc-to-daylight/w/documents/27486/dc-to-daylight-07-how-to-drive-leds/challenges-projects/element14-presents/dc-to-daylight/w/documents/27486/dc-to-daylight-07-how-to-drive-leds

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  • Beautiran
    0 Beautiran over 2 years ago in reply to beacon_dave

    Hi, thanks for all the feedbacks, I confirmed with a friend pro photographer that it is Moire problem. The 8MPx cameras that I was using before could not catch this level of detail and did not generate Moire. Some time too good is no good ;-)

    He suggested to try to change shutter speed to try to reduce that.

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  • Beautiran
    0 Beautiran over 2 years ago in reply to beacon_dave

    Thanks again, yes I use regular LED bars that flicker. I was going to make my own fix current system but then reducing shutter speed to 100 did the trick. The shadows a less in number and very soft now.

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  • Beautiran
    0 Beautiran over 2 years ago in reply to bidrohini

    Thanks, yes continuous current LED lighting is ideal but I was able to reduce to an acceptable level that by reducing shutter speed form 400 to 100. 

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