[OSM-talk] Face and license blurring (GDPR territories)

[Christian Quest]

Le 06/10/2020 à 22:41, Nick Whitelegg a écrit :
> Hi,
>
> Apologies if this is only tangentially OSM related, but I thought I'd 
> ask here to try and get some expert advice.
>
> As you may know, Mapillary has been bought by Facebook and there has 
> been interest in developing, or at least starting to develop/actively 
> researching the possibility of, some sort of open source alternative. 
> I have been developing OpenTrailView (opentrailview.org), however I 
> now have a collaborator to work on exploring an open source panos 
> platform.
>
> The main question I have relates to the very necessary privacy steps 
> that must be taken, in particular face and license plate blurring. I 
> have experimented with various libraries using various datasets and 
> models, and have found that the understand.ai Anonymizer 
> (https://github.com/understand-ai/anonymizer), which advertises itself 
> as something specifically aimed at implementing the privacy 
> protections needed to comply with the GDPR, seems to be working the best.
>
> It detects faces and license plates in clear view on panoramas, which 
> can then be blurred.
>
> My question, then, is what to do about people, or cars, which are 
> further away from the camera? In these cases, the algorithm does not 
> necessarily detect the face or license plate, but on the other hand in 
> general the faces and license plates are not clearly visible, or 
> identifiable, in any case.
>
> So in summary, the tool blurs clearly visible faces or license plates, 
> but in general does not blur those which are not clearly visible.
>
> Apologies once again that this is only tangentially related to OSM 
> (OpenTrailView uses OSM to connect panos together, so not completely 
> unrelated) but it is very much an open geodata issue, so I thought I'd 
> ask to get feedback.
>
> I am in the UK and the server is in Germany (Hetzner), so GDPR would 
> apply.
>
>
> Thanks,
> Nick


We have tested blurring using image segmentation which allows to blur 
full parts of pictures like people and cars, not only faces and license 
plates.


Here is the result: https://takeitout.cquest.org/photo/cquest/blurred/


The code used is on github: https://github.com/tyndare/blur-persons/


We did some tests using TPU to speedup the process.


-- 
Christian Quest - OpenStreetMap France

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