L'assassinat les questions

Sujet: Authentification des backyard photos

Créé le: Wednesday, December 21, 2011 - 10:52 AM

Date d'inscription: May 24, 2007
Dernière visiteOct 17, 2015
Messages: 261
Rang: accroc

Les backyard photos sont authentiques et n'ont pas été trafiquées, c'est la conclusion d'une étude à l'aide des outils d'analyse les plus performants du moment par un professeur de l'université de Dartmouth:


Dartmouth Professor finds that iconic Oswald photo was not faked

Dartmouth College Office of Public Affairs - Press Release
Posted 11/05/09 - Media Contact: Susan Knapp (603) 646-3661

Dartmouth Computer Scientist Hany Farid has new evidence regarding a photograph of accused John F. Kennedy assassin Lee Harvey Oswald. Farid, a pioneer in the field of digital forensics, digitally analyzed an iconic image of Oswald pictured in a backyard setting holding a rifle in one hand and Marxist newspapers in the other. Oswald and others claimed that the incriminating photo was a fake, noting the seemingly inconsistent lighting and shadows. After analyzing the photo with modern-day forensic tools, Farid says the photo almost certainly was not altered.

"If we had found evidence of photo tampering, then it would have suggested a broader plot to kill JFK," said Farid, who is also the director of the Neukom Institute for Computational Science at Dartmouth. "Those who believe that there was a broader conspiracy can no longer point to this photo as possible evidence." Farid added that federal officials long ago said that this image had not been tampered with, but a surprising number of skeptics still assert that there was a conspiracy.

The study will appear in a forthcoming issue of the journal Perception.

Farid and his team have developed a number of digital forensic tools used to determine whether digital photos have been manipulated, and his research is often used by law enforcement officials and in legal proceedings. The tools can measure statistical inconsistencies in the underlying image pixels, improbable lighting and shadow, physically impossible perspective distortion, and other artifacts introduced by photo manipulators. The play of light and shadow was fundamental in the Oswald photo analysis.

"The human brain, while remarkable in many aspects, also has its weaknesses," says Farid. "The visual system can be quite inept at making judgments regarding 3-D geometry, lighting, and shadows."

At a casual glance, the lighting and shadows in the Oswald photo appear to many to be incongruous with the outdoor lighting. To determine if this was the case, Farid constructed a 3-D model of Oswald?s head and portions of the backyard scene, from which he was able to determine that a single light source, the sun, could explain all of the shadows in the photo.

"It is highly improbable that anyone could have created such a perfect forgery with the technology available in 1963," said Farid. With no evidence of tampering, he concluded that the incriminating photo was authentic.

"As our digital forensic tools become more sophisticated, we increasingly have the ability to apply them to historic photos in an attempt to resolve some long-standing mysteries," said Farid.

>>>vidéo: http://www.yout…?v=D4gw_3nA5G4

Source: http://www.dart…009/11/05.html

Date d'inscription: Jan 09, 2008
Dernière visiteFeb 10, 2012
Messages: 122
Rang: assidu

Wednesday, July 27, 2011 - 04:02 PM
Pour la photo là, j'ai eut des doutes...Mais je disais avant qu'elle n'était pas authentique pour cause que j'avais lu des tonnes de livres qu'ils le disaient et j'y croyais. Mais là très surprenant par la video de comment il nous a expliquer ses conclusions !!!

Date d'inscription: Jan 09, 2008
Dernière visiteFeb 10, 2012
Messages: 122
Rang: assidu

Wednesday, December 21, 2011 - 10:52 AM
En plus, je viens d'apprendre par Marina Oswald que c'est elle qui avait prit la photo, elle ne sait pas pourquoi elle a prit la photo.

Si Marina le dit donc c'est prouver que c'est elle qui a prit la photo.