Slides (pdf) - Jesse Kornblum

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Digital BallisticsDC3! Match to individual devices– Depends on small imperfections in lens, sensor– Requires lots of images from each camera– Beyond the scope of this presentation
DC3! Match to type of deviceDigital Ballistics– Possible to identify IJG tables• Except when adaptive makes these by accident– Possible to identify Photoshop tables• But could, in theory, be adaptive tables– Possible to identify adaptive tables• But could be either hardware or software! In all cases, may only be last device to process
Page 4 and 5: Real PictureDC3WARNING:EXPLICIT IMA
Page 6 and 7: Real PictureDC3Image © Copyright P
Page 8 and 9: DC3! JPEG Compression- Lossy compre
Page 10 and 11: Quantization TablesDC32 1 1 1 1 1 2
Page 12 and 13: DC3Quantization Calculations! Origi
Page 14 and 15: IJG Standard TableDC316 11 10 16 24
Page 16 and 17: DC3IJG Standard Tables! Most softwa
Page 18 and 19: Adobe PhotoshopDC3! Adobe Photoshop
Page 20 and 21: DC3Custom Adaptive Tables! Table is
Page 24 and 25: DC3Digital Ballistics! Set of known
Page 26 and 27: DC3Calvin! By default, displays fil
Page 28 and 29: DC3Calvin! Can dump tables from an
Page 30 and 31: DC3Digital Ballistics! This is just
Page 32 and 33: Digital BallisticsDC3But contains s
Page 34 and 35: DC3Acknowledgements! Imagery provid

Slides (pdf) - Jesse Kornblum

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