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Posts Tagged ‘photo forensics’

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2016-10-12

Surprises of JPEG Quantization Table

Examination of JPEGĀ quantization tables has been used in digital imageĀ forensics for quite a long time. Using it an examiner can:

identify imagery processed by software [1, 2]; identify camera, including its model [1, 2]; detect double compressed images [3].
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2016-09-21

Blurring Detection Using ELA

In our previous article we discussed using ELA for detection of fragments insertion from the same image or another image. This method also allows examiner to detect other image modifications. For example, image scaling, brightness, contrast and saturation correction, editing with an image editor, and filters usage.

But ELA results interpretation in such cases demands more experience from examiner. The best way to gain it is analysing images with known modifications.

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