Method for the prior monitoring of the detectability of a watermarking signal

摘要

A method for the prior monitoring of the detectability of a watermarking signal inserted by modulation in a set of coefficients (b) representing for example a digital image (I), comprises a step (E44) of simulating a distortion on the set of modulated coefficients (Xjs), the distortion corresponding to a given compression level of the set of coefficients before modulation, determined by optimisation of a ratio of transmission rate to distortion; a step (E45) of calculating a detectability test (ts) on the set of modulated coefficients after distortion; and a step (E47) of comparing the detectability test with a threshold detection value (T). Use notably for inserting a watermarking signal during the compression of a digital image.