Chapter 5 - Multimedia Security Based on Exrinsic Data

Chapter 5 - Multimedia Security Based on Exrinsic Data -...

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Chapter 5 Multimedia Security Based on Extrinsic Data 1. In the past few years, semi-fragile watermarking has become increasingly important to verify the content of images and localise the tampered areas, while tolerating some non-malicious manipulations. 2. In the literature, the majority of semi-fragile algorithms have applied a predetermined threshold to tolerate errors caused by JPEG compression. 3. However, this predetermined threshold is typically fixed and cannot be easily adapted to different amounts of errors caused by unknown JPEG compression at different quality factors (Qfs). 4. The results show an overall average QF correct detection rate of approximately 99%, when 5%, 20% and 30% of the pixels are subjected to image content tampering and compression using different QFs (ranging from 95 to 65). 5. Nowadays, the popularity and affordability of advanced digital image editing tools, allow users to manipulate images relatively easily and professionally.
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