PhotoDNA

From Wikipedia, the free encyclopedia

PhotoDNA refers to a technology developed by Microsoft that computes hash values of images in order to identify alike images.[1] It is currently used by Twitter,[2] Facebook [3] and the National Center for Missing & Exploited Children,[4] to whom Microsoft has donated the technology.

PhotoDNA is primarily used in the prevention of child pornography and works by computing a hash that represents an image. This hash is computed such that it is resistant to alterations in the image, including resizing and minor colour alterations.[1] It works by converting the image to black and white, breaking it into a grid, and looking at intensity gradients or edges.[5]

References

  1. ↑ 1.0 1.1 "PhotoDNA at a Glance". Retrieved 22 July 2013. 
  2. ↑ Arthur, Charles (22 July 2013). "Twitter to introduce PhotoDNA system to block child abuse images". The Guardian. Retrieved 22 July 2013. 
  3. ↑ Smith, Catharine (05/02/11). "Facebook Adopts Microsoft PhotoDNA To Remove Child Pornography". Huffington Post. Retrieved 22 July 2013. 
  4. ↑ Salcito, Anthony (2009-12-17). "Microsoft donates PhotoDNA technology to make the Internet safer for kids". Retrieved 22 July 2013. 
  5. ↑ http://www.microsoft.com/global/en-us/news/publishingimages/ImageGallery/Images/Infographics/PhotoDNA/flowchart_photodna_Web.jpg


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