Watermarking using Side Information |
During the past few years, the development of digital files sharing has been incredible, and led to a certain amount of abuses, the most important one being piracy and illegal copying. Thus, new Methods have been invented to struggle against these abuses and the most well known technique is watermarking. Watermarking allows marking in an indelible way a media so that the message embedded (legal owner/author, right or not to copy…) remains accessible and readable whatever happens to the media itself during its normal use. This thesis suggest a watermarking system using Quantization Index Modulation allowing to embed a watermark in the spatial domain that will resist to the geometric attacks that are commonly used such as cropping, rows/columns deletion and rotation. The system has been tested in different situations and with different attacks to show its strengths, weaknesses and limits.
Lefort S, Ambroze MA