The software was developed two years ago by Dartmouth College and Microsoft, which works based on the database of images of child pornography from the National Center for Missing and Exploited Children (NCMEC), the United States. Automatically upload photos to compare with the database, and any sign that appears to be the same.
"Traditionally, if the image is resized or edited in a way at all, blue print or digital signature of the photos that will be different, and it would be difficult or sometimes even impossible to find an image nearly identical," said Brad Smith, an interpreter Facebook speech, as reported by TG Daily, Wednesday (05/25/2011). But PhotoDNA, said the company, can detect the drawings even when they have been modified in this way.
Facebook is now planning to run the software on each photo was uploaded to their site, and will report the offending images either to NCMEC and the police. Computer science professor Hany Farid says it can scan images in just four milliseconds, which means users will not see a delay.
He said that the test can detect 99.7 per cent in real time, and have a false positive rate between one in two billion and one in ten billion.
"Perpetrators of child pornography problem in the world - and particularly in the United States - has really exploded with the advent of the internet," said Ernie Allen, president and CEO of NCMEC. "Twenty years ago we thought this problem had almost disappeared,"
He said that the beta testing of software in New Zealand have led to arrests. Microsoft also has succeeded in using technology to remove the 1000 image of cloud-based storage service SkyDrive since February.
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