Insurance companies must detect falsified claims which sometimes include modified photographs. One way to detect such
doctored images is to combine device authentication with image authentication.
In this paper, we focus on image authentication and report a new alteration detection method
using quantization step characteristics in a compressed domain.
We also describe results of experiments involving embedding and detection, and the processing time required.
By: Kohichi Kamijoh
Published in: RT0419 in 2002
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