Processing device for the generation of 3D content versions and associated device for obtaining content
View Patent ↗A device is intended to process three-dimensional content for a server. The three-dimensional content comprises at least two image sequences obtained from different angles, wherein a three-dimensional rendering is associated to a level of disparity between said at least two image sequences. This processing device is configured to generate from a content at least two different content versions corresponding to different levels of disparity adapted to different transmission bit rates, wherein the disparity level decreases with said transmission bit rate. A server comprising the processing device, a three-dimensional content-obtaining device, and a content receiver comprising three-dimensional content-obtaining device are further disclosed.
1. A device for processing three-dimensional content, said three dimensional content having at least two image sequences obtained or generated from different angles and transmitted via a communication network, wherein a three-dimensional rendering of the content is associated with a level of disparity between said at least two image sequences, said device being configured to generate from said content at least two different content versions corresponding to different levels of disparity adapted to different transmission bit rates of the network, and to encode at least one of the image sequences of content, wherein the level of disparity decreases when the transmission bit rate of the network decreases, the device being further configured to:
encode only one of the said image sequences of a content in order to produce a version corresponding to a transmission bit rate below said threshold; and
generate said content versions according to a law for the level of disparity as a function of the transmission bit rate, wherein said law comprises a transmission bit rate threshold below which the level of disparity is equal to zero.
2. The device according to claim 1 , further configured to generate a description file describing the levels of disparity and/or the transmission bit rates of the versions of a content, said description file being stored in correspondence with said versions.
3. The device according to claim 1 , further configured to produce versions of content which comprise reference frames having temporal positions which are identical from one version to another.
4. The device according to claim 1 , further configured to encode each sequence of each content independently of the other sequences of this same content, so that each version of said content consists of sub-groups of data associated respectively with said sequences and corresponding respectively to the different levels of disparity, or corresponding respectively to complementary levels of disparity to define separately or at at least two the different levels of disparity.
5. The device according to claim 1 , further configured to generate each version by video encoding means applying a compression technique chosen from a group comprising at least MVC, AVC and SVC.
6. A server comprising a processing device according to claim 1 .
7. A three-dimensional content-obtaining device, for a content receiver, said three-dimensional content having at least two image sequences obtained or generated from different angles and transmitted via a communication network, wherein a three-dimensional rendering of the content is associated with a level of disparity between said at least two image sequences; said device being configured to select a version of content according to a chosen level of disparity adapted to a chosen transmission bit rate of the network, wherein at least two different content versions corresponding to different levels of disparity adapted to different transmission bit rates of the network are stored in a content storage server, and wherein the level of disparity decreases when the transmission bit rate of the network decreases; said device being further configured to:
command said content receiver to request said selected version from a content storage server,
encode only one of the said image sequences of a content in order to produce a version corresponding to a transmission bit rate below said threshold; and
generate said content versions according to a law for the level of disparity as a function of the transmission bit rate, wherein said law comprises a transmission bit rate threshold below which the level of disparity is equal to zero.
8. The three-dimensional content-obtaining device according to claim 7 , being further configured to command said content receiver to recover from said server a description file, which is stored in correspondence with the versions of a content which it wishes to obtain and which describe their respective levels of disparity and/or their respective transmission bit rates, then to start a streaming session by continuously controlling the chosen version of said content according to the desired level of disparity and/or the desired transmission bit rate.
9. A content receiver comprising a three-dimensional content-obtaining device according to claim 7 .