Interesting subject Dan. In my last 18 paid working years I was an expert witness for Ford. During that time we converted from film to digital photography. With film we had to keep the negatives for proof that the images we testified to were real. With digital we kept the original memory cards. I was aware then of efforts to fool proof digital images but that was still in its infancy. The truthfulness of my images, both film and digital boiled down to my swearing that the images I presented were a true and honest representation of the subject as I saw it when photographed. Never had any of my images, presented at trial, questioned.
-----Original Message----- >From: "Daniel J. Matyola" <[email protected]> >Sent: Feb 15, 2021 10:50 AM >To: Pentax-Discuss Mail List <[email protected]> >Subject: OT: Photo Forensics > >I thought that some here might find this book (which I received as a >Valentine's Day present) of interest. > >I met Hany Farid when he gave a talk and demonstration at Dartmouth during >my 45th class reunion. He is an expert in the field, and has a natural >ability to make complex subjects comprehensible. > >Photo Forensics (The MIT Press) Paperback – February 26, 2019 >by Hany Farid (Author) > >*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. > >Dan Matyola >-- >%(real_name)s Pentax-Discuss Mail List >To unsubscribe send an email to [email protected] >to UNSUBSCRIBE from the PDML, please visit the link directly above and follow >the directions. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to [email protected] to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
