Method of tattooing of marking information into a digital image, used in image compression techniques such as those using JPEG standards, inserts marking information when calculated coordinates are verified

摘要

The method includes a step of selecting (E20) a digital image point, a step of evaluation (E21) of a modification of the position of the selected point. The next step is a step of calculating (E22) of co-ordinates of the selected modified point in a spatial coordinate system, the coordinates being invariant in the spatial coordinate system to a predetermined assembly for geometric transformation of the image, There are further steps of accepting (E23,E24) of insertion of marking information when the calculated coordinates verifies the given characteristic.