Convicted because of digital camera 'fingerprints'
| A new forensic technique means many digital photographs can now be traced to the individual cameras that took them. The method works by analysing imperfections in the cameras' light sensors. Jessica Fridrich and colleagues at Binghamton University in New York, US, analysed more than 3000 digital images taken using 11 different models of digital camera. They found that minute flaws in each camera's sensors left their mark on the images, making it possible to link each picture to a particular camera. Inside each camera, a light-sensitive chip called a charge-coupled device (CCD) converts incoming photons into electrons. Each CCD is covered with millions of individual light-sensors. But these individual sensors do not capture light with uniform efficiency and leave a subtle pattern of variation, or "noise", on each digital image. Fridrich's team developed an algorithm that identifies the noise produced by a particular camera's sensor by analysing scores of images taken using it. "No two CCD sensors are alike," Read more... This was seized 4 u at New Scientist |
posted by Roland at 4/24/2006 06:43:00 PM
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