Photo Forensics

Hany Farid

336 pages, parution le 25/02/2019

Ajouter à une liste

Indisponible

Résumé

The first comprehensive and detailed presentation of techniques for authenticating digital images.The first comprehensive and detailed presentation of techniques for authenticating digital images. Photographs have been doctored since photography was invented. Dictators have erased people from photographs and from history. Politicians have manipulated photos for short-term political gain. Altering photographs in the predigital era required time-consuming darkroom work. Today, powerful and low-cost digital technology makes it relatively easy to alter digital images, and the resulting fakes are difficult to detect. The field of photo forensics-pioneered in Hany Farid's lab at Dartmouth College-restores some trust to photography. In this book, Farid describes techniques that can be used to authenticate photos. He provides the intuition and background as well as the mathematical and algorithmic details needed to understand, implement, and utilize a variety of photo forensic techniques. Farid traces the entire imaging pipeline. He begins with the physics and geometry of the interaction of light with the physical world, proceeds through the way light passes through a camera lens, the conversion of light to pixel values in the electronic sensor, the packaging of the pixel values into a digital image file, and the pixel-level artifacts introduced by photo-editing software. Modeling the path of light during image creation reveals physical, geometric, and statistical regularities that are disrupted during the creation of a fake. Various forensic techniques exploit these irregularities to detect traces of tampering. A chapter of case studies examines the authenticity of viral video and famously questionable photographs including "Golden Eagle Snatches Kid" and the Lee Harvey Oswald backyard photo.Hany Farid is Professor of Computer Science at Dartmouth College and Cofounder and Chief Technology Officer for Fourandsix Technologies.

Caractéristiques techniques

	PAPIER
Éditeur(s)	Mit press
Auteur(s)	Hany Farid
Parution	25/02/2019
Nb. de pages	336
EAN13	9780262537001

Avantages Eyrolles.com

Livraison à partir de 0,01 € en France métropolitaine

Paiement en ligne SÉCURISÉ

Livraison dans le monde

Retour sous 15 jours

+ d'un million et demi de livres disponibles

Photo Forensics

Résumé

Caractéristiques techniques

Consultez aussi