Résumé
In this paper, we present a DCT-based data-hiding method robust to cropping. As it works in the DCT-domain, it is also robust to JPEG compression. A cropping operation on a JPEG image leads to the application of an additionnal compression. So, we achieve robustness to several JPEG compressions by an original datahiding process. The cropping robustness is then obtained by localizing the information in a particular region of interest (ROI): whereas no area of the ROI is removed, the integrity of the hidden data is preserved. As we choice the ROI centered on the main focus, removing the hidden-data leads to removing the interest of the image. The data-hiding process is _nally not dependant on the image coordinates but on the ROI. It is applied on other blocks than those used by the JPEG compression and leads to an asynchronous method instead of a whole integrated one: _rstly a data-hiding step and secondly a compression step.