Watermarking already imposed itself as an effective and reliable solution for conventional multimedia content
protection (image/video/audio/3D). By persistently (robustly) and imperceptibly (transparently) inserting some extra
data into the original content, the illegitimate use of data can be detected without imposing any annoying constraint
to a legal user. The present paper deals with stereoscopic image protection by means of watermarking techniques.
That is, we first investigate the peculiarities of the visual stereoscopic content from the transparency and robustness
point of view. Then, we advance a new watermarking scheme designed so as to reach the trade-off between
transparency and robustness while ensuring a prescribed quantity of inserted information. Finally, this method is
evaluated on two stereoscopic image corpora (natural image and medical data).