Multiple-viewpoints related metadata transmission and reception method and apparatus
Disclosed is a 360-degree video data processing method performed by a 360-degree video transmission apparatus, the method comprising: obtaining 360-degree video data captured by at least one image obtaining device; deriving a two-dimensional (2D) picture comprising omnidirectional image by processing the 360-degree video data; generating metadata for the 360-degree video data; encoding information on the 2D picture; and performing encapsulation based on the encoded picture and the metadata, wherein the metadata comprises information on viewpoint group ID, and wherein multiple-viewpoints related to the 360-degree video data are categorized into at least one viewpoint group based on the viewpoint group ID.
1. A 360-degree video data processing method performed by a 360-degree video transmission apparatus, the method comprising:
obtaining 360-degree video data;
deriving a two-dimensional (2D) picture by processing the 360-degree video data;
generating metadata;
encoding the 2D picture; and
performing encapsulation based on the encoded picture and the metadata,
wherein:
the metadata comprises information that viewpoints are dynamically switching over time, and
the information comprises a group identification which indicates a group identifier,
the metadata comprises a transition effect flag indicating whether to apply a transition effect when viewpoint switching,
the metadata comprises transition effect type information when the transition effect flag indicates a predetermined value, and the transition effect type information comprises information on a zoom-in effect when a value of a transition effect type is 0 and the transition effect type information comprises information on a walking-through effect when the value of the transition effect type is 1.
2. The method of claim 1 , wherein:
multiple-viewpoints related to the 360-degree video data are categorized into at least one viewpoint group based on the group identification,
the multiple-viewpoints comprise a first viewpoint and a second viewpoint, and
when a group identification of the first viewpoint and a group identification of the second viewpoint are same, the first viewpoint and the second viewpoint are comprised in a first viewpoint group.
3. The method of claim 2 , wherein the first viewpoint and the second viewpoint comprised in the first viewpoint group share a common reference coordinate system.
4. The method of claim 2 , wherein the multiple-viewpoints comprise a third viewpoint which is comprised in a second viewpoint group different from the first viewpoint group, and
wherein a common reference coordinate system for the first viewpoint and a common reference coordinate system for the third viewpoint are different from each other.
5. The method of claim 1 , wherein the metadata comprises description information for one of the at least one viewpoint group.
6. The method of claim 5 , wherein the description information is based on a null-terminated UTF-8 (Universal coded character set+Transformation Format-8 bit) string.
7. The method of claim 1 , wherein the metadata comprises information on location of a center point of a fourth viewpoint comprised in the multiple-viewpoints.
8. The method of claim 7 , wherein the information on the location of the center point of the fourth viewpoint is represented based on a common reference coordinate system of a viewpoint group comprising the fourth viewpoint.
9. The method of claim 3 , wherein viewpoint switching is performed between the first viewpoint and the second viewpoint included in the first viewpoint group.
10. The method of claim 9 , wherein the transition effect is applied when the first view point is switched to the second view point upon the viewpoint switching.
11. A 360-degree video transmission apparatus for processing 360-degree video data, the apparatus comprising:
a projection processor configured to derive a two-dimensional (2D) picture by processing 360-degree video data;
a metadata processor configured to generate metadata;
a data encoder configured to encode the 2D picture; and
an encapsulation processor configured to perform encapsulation based on the 2D picture and the metadata,
wherein:
the metadata comprises information that viewpoints are dynamically switching over time, and
the information comprises a group identification which indicates a group identifier,
the metadata comprises a transition effect flag indicating whether to apply a transition effect when viewpoint switching,
the metadata comprises transition effect type information when the transition effect flag indicates a predetermined value, and
the transition effect type information comprises information on a zoom-in effect when a value of a transition effect type is 0 and the transition effect type information comprises information on a walking-through effect when the value of the transition effect type is 1.
12. A 360-degree video data processing method performed by a 360-degree video reception apparatus, the method comprising:
receiving 360-degree video data including encoded picture;
obtaining metadata of the 360-degree video data;
decoding the encoded picture; and
rendering the decoded picture based on the metadata,
wherein:
the metadata comprises information that viewpoints are dynamically switching over time, and
the information comprises a group identification which indicates a group identifier,
the metadata comprises a transition effect flag indicating whether to apply a transition effect when viewpoint switching,
the metadata comprises transition effect type information when the transition effect flag indicates a predetermined value, and
the transition effect type information comprises information on a zoom-in effect when a value of a transition effect type is 0 and the transition effect type information comprises information on a walking-through effect when the value of the transition effect type is 1.
13. A 360-degree video reception apparatus for processing 360-degree video data, the apparatus comprising:
a receiver configured to receive 360-degree video data including encoded picture;
a data decoder configured to decoded the encoded picture; and
a renderer configured to render the decoded picture based on metadata derived from the 360 -degree video data,
wherein:
the metadata comprises information that viewpoints are dynamically switching over time, and
the information comprises a group identification which indicates a group identifier,
the metadata comprises a transition effect flag indicating whether to apply a transition effect when viewpoint switching,
the metadata comprises transition effect type information when the transition effect flag indicates a predetermined value, and
the transition effect type information comprises information on a zoom-in effect when a value of a transition effect type is 0 and the transition effect type information comprises information on a walking-through effect when the value of the transition effect type is 1.