Digital pics contain fingerprints of cameras used to click themNovember 15th, 2008 - 4:28 pm ICT by ANI
London, November 15 (ANI): A digital picture carries pixel-based fingerprint that can reveal which camera model was used to click it, say researchers.
Nasir Memon of the Polytechnic University in Brooklyn, New York, has revealed that every digital camera has an in-built “demosaicing” software that translates each pixel into a usable colour and brightness signal.
He says that software has to be tailored to a particular camera type to cater for the many peculiarities of each model, including colour filter arrays, lenses, and light-sensitive microchip called a charge-coupled device (CCD).
According to him, one of the algorithm’’s tasks is to work out the colour a screen pixel should adopt without jarring with the colours of neighbouring pixels.
Memon says that he and his colleagues have discovered how to work backwards from neighbouring pixel values in a photo to identify the model-specific demosaicing algorithm that created it.
The researcher says that his teams approach has been found to identify cameras with 90 per cent accuracy in early tests.
Mark Pollitt, a former FBI crime lab scientist who is currently associated with the University of Central Florida in Orlando, says that the novel technique may make a big difference to detective work if further tests too provide promising results.
He substantiates his statement with the example of a photo of any kidnapped person emailed to a press agency.
“If we can identify the camera, then there is a possibility that we can identify who bought it and where,” New Scientist magazine quoted him as saying.
Though the same camera models may be owned by many people, Pollitt still believes that the new approach can be used forensically.
Given that digital cameras have a shelf life of only 18 months, he adds, it may be possible to find out when and where it was sold. (ANI)
- Eye of Gaia: billion-pixel camera to map Milky Way - Jul 08, 2011
- Now, software that can turn blurry snaps into pics worth keeping - May 10, 2010
- Space station cosmonauts to make 3D photo report - May 17, 2012
- New software helps edit billions of pixels in seconds - Oct 31, 2010
- Physics Nobel gone to undeserving duo, say former colleagues - Dec 22, 2009
- Software claims world record by solving 400-piece jigsaw puzzle - May 22, 2010
- Astonishing bionic enables blind to see - Nov 22, 2011
- NASA software could aid interpretation of medical imagery - Oct 15, 2010
- Scientist to make stellar observations aboard Boeing 747 - Dec 02, 2010
- Bionic eye to help the blind 'see' - Nov 27, 2010
- Now, a camera that creates real-time, 3D colour movies of the brain! - Feb 05, 2011
- Web app to keep track of Indian tigers - May 20, 2012
- Now, a software for cops to find criminals easily - Mar 05, 2011
- Electronic implants to give sight back to blind - Nov 03, 2010
- 'X-ray vision' laser camera shoots 'invisible objects' around corners - Nov 19, 2010
Tags: brooklyn new york, camera models, camera type, charge coupled device, colour filter, detective work, digital cameras, fbi crime lab, lab scientist, memon, microchip, new scientist magazine, novel technique, peculiarities, pixel values, polytechnic university, promising results, screen pixel, shelf life, university of central florida