Method for generating and reconstructing a three-dimensional video stream, based on the use of the occlusion map, and corresponding generating and reconstructing device

A device for generating a three-dimensional video stream by starting from a sequence of video images, said sequence comprising a first view (V0), at least one second view (V1) of a scene, as well as a depth map (D0) of said first view (V0), or a disparity map of said at least one second view (V1) with respect to the first view (V0), the device comprising:

• means for obtaining said at least one occlusion image (O1) comprising the occluded pixels of said at least one second view (V1) by starting from a depth map (D0) of said first view (V0), or from a disparity map of said at least one second view (V1) with respect to the first view (V0);
• means for generating said at least one compacted occlusion image (OC1) by spatially repositioning said occluded pixels of said at least one occlusion image (O1), so as to move said pixels closer to one another;
• means for obtaining said three-dimensional video stream comprising, for one image, said first view (V0), said depth map (D0) or said disparity map, and said at least one compacted occlusion image (OC1).

A device for reconstructing a three-dimensional video stream comprising a sequence of video images, said device comprising:

• means for receiving a first view (Vdec0, V0) of said sequence of video images, a depth map (Ddec0, D0) of said first view (Vdec0, V0), or a disparity map between said first view (Vdec0, V0) and at least one second view (Vdec1, V1) of said sequence of video images, and at least one compacted occlusion image (OCdec1, OC1) obtained by spatially repositioning the occluded pixels of at least one occlusion image (O1) of said at least one second view (Vdec1), so as to move said pixels closer to one another;
• means for obtaining said at least one reconstructed occlusion image (Odec1, O1) by repositioning said occluded pixels of said at least one second view (Vdec1, V1) in the position they were in prior to the compaction operation carried out in order to obtain said at least one compacted occlusion image (OC1);
• means for reconstructing said at least one second view (Vdec1, V1) by starting from said first view (Vdec0, V0), from said depth map (Ddec0, D0) or, respectively, from said disparity map, and from said at least one reconstructed occlusion image (Odec1, O1).