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Scenario: Burger business holds an online photo contest that gives $1 off on a hamburger meal, to anyone submitting a photo of themselves, wearing printed t-shirt with a burger on it.

Is there a way to identify if a photo was used before. The objective would be to have thousands and thousands of separate hamburger t-shirt pictures but no two pictures that are alike.

Wouldn't care what kind of burger as long as it is on the tshirt

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    \$\begingroup\$ I don't know of how to do it, but conceptually it is possible, as what you are asking for is basically what Google image search does - you give it a photo, and it tells you if it it is already online. But IMHO this is more of a data processing rather than photography problem, so is not suited to this forum. \$\endgroup\$
    – Peter M
    Nov 2, 2022 at 22:07
  • \$\begingroup\$ thank you for the feedback. The confirmation that it is possible will allow me to move forward and figure out the details later. Thanks Again i will be back on this forum for photo advice. \$\endgroup\$
    – B Barns
    Nov 2, 2022 at 22:12
  • \$\begingroup\$ I've used a Windows application called VisiPics to identify duplicate images in the past, so programmatic identification of duplicates seems to be something that was solved long ago. \$\endgroup\$
    – osullic
    Nov 2, 2022 at 23:23

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This is not really a photography question. It is possible to do such things, but it is really a software engineering and artificial intelligence problem that has little to do with photography by itself.

I would suggest starting your research by looking at PhotoDNA, which is what a lot of websites use to detect images that they do not allow on their platform.

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In photography, as long as each person takes a new photo, even if it is of a similar subject, it is still a new photo and the photographer cannot be faulted for repeating the content! As a business owner and issuer of the call, you must place a specific and variable physical sign on the objects in front of the lens when staging the scene for photography, so that no two photos are alike.

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