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1. TOWARDS PRACTICAL SELF-EMBEDDING FOR JPEG-COMPRESSED DIGITAL
IMAGES
ABSTRACT
This paper deals with the design of a practical self-recovery mechanism for lossy
compressed JPEG images. Weextend a recently proposed model of the content
reconstructionproblem based on digital fountain codes to take into account the impact of
emerging watermark extraction and block classificationerrors. In contrast to existing methods,
our scheme guarantees ahigh and stable level of reconstruction quality. Instead of
introducingreconstruction artifacts, emerging watermark extractionerrors penalize the achievable
tampering rates. We introduce newmechanisms that allow for handling high-resolution and color
images efficiently. In order to analyze the behavior of our scheme,we derive an improved model
to calculate the reconstructionsuccess probability. We introduce a new hybrid mechanism for
spreading the reference information over the entire image, whichallows to find a good balance
between the achievable tamperingrates and the computational complexity. Such an approach
reducedthe watermark embedding time from the order of severalminutes to the order of single
seconds, even on mobile devices.