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Reconnaissance faciale sur internet
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Message Posté le : Mer 2 Sep - 09:36 (2009)    Sujet du message : Reconnaissance faciale sur internet Répondre en citant

Trouvé sur un autre forum...

Citation :
Avez-vous votre photo sur le web?
Si oui, cela va devenir, bientôt, très dangereux :twisted:


Face Recognition for Online Photo Searches Sparks Privacy Fears
Mason Inman
for National Geographic News
January 5, 2007

A new type of search engine using facial recognition technology could soon be able to pinpoint images of a person among the billions of photos posted online—even if their name does not appear.
A Swedish company named Polar Rose plans to launch its service for facial searches tied to the photo-sharing site Flickr within a couple weeks.
In the next few months the firm hopes to expand the service to search images across the entire Web.
The technology promises enhanced photo finding that would make it easier to find people on the Internet.
But privacy advocates are concerned that Polar Rose and similar facial-mapping search engines will violate people's rights and potentially aid criminals.
Lee Tien is an attorney at the Electronic Frontier Foundation, an Internet watchdog group that focuses on privacy and civil liberties.
"Photos [posted online] are effectively anonymous now," Tien said, unless they are labeled with some sort if identifying text. "But if Polar Rose works the way they say it will, that's all going to change."
Tien said that this kind of technology could aid stalkers in tracking down their victims, or it could allow employers, insurance companies, and the government to pry into people's lives more than some of us would like.
"People are going to have to be more careful about picture-posting and figure out ways they can prevent pictures from being [analyzed] by these search engines," Tien said.
Current image searches are based on the text surrounding a photo. Images of your neighbor, for example, should only be found if his or her name is in an associated caption or article.
Polar Rose's system works by analyzing a photo to create a three-dimensional sculpture of a person's face, which can account for changes in angle and lighting.
The company developed a computer system that takes about a second and a half to roughly guess what a person looks like in 3-D based on a photo.
The service then encodes the 3-D portrait as a set of numbers describing the face, which they call a "face print." Different face prints can be compared to see if they appear to be the same person.
The system is more than 90 percent accurate when combing through a set of about 10,000 photos, Nyholm said.
But the Web contains vastly more photos, so there are more images of people that look similar enough to trick the system.
"If we searched purely on face prints, it wouldn't be reliable enough," said Polar Rose CEO Nikolaj Nyholm. "That's why we need the help of users."
Polar Rose's system will ask users to input the names of people they recognize in photos online.
With users' help, the company will build a huge database linking together various photos of a person along with other information about them.
This database will then be able to sift through the billions of online photos and tell the difference between, for example, a girl and her sister.
"We do believe we'll be harnessing the collective intelligence rather than just the intelligence of single users," Nyholm said.
Nyholm added that Polar Rose is concerned about privacy.
The firm plans to give people ways of removing photos from the company's database or to avoid having their online photos analyzed and catalogued in the first place.
(...)


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