Granted Patent B2

US 12,501,053 · App. 17/328,866 · Granted Dec 16, 2025

Inventors: Robert Skupin (Berlin, DE); Yago Sánchez De La Fuente (Berlin, DE); Cornelius Hellge (Berlin, DE); Adam Wieckowski (Berlin, DE); Valeri George (Berlin, DE); Benjamin Bross (Berlin, DE); Thomas Schierl (Berlin, DE); Karsten Suehring (Berlin, DE); Thomas Wiegand (Berlin, DE)

Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

H04N19/159H04N19/105H04N19/139H04N19/176H04N19/196H04N19/577

Abstract

Claims (41)

1 . A video decoder comprising at least one processor configured to:

identify a location of a current block within a current picture, wherein the current picture is one of a sequence of pictures in temporal presentation order;

derive motion information for the current block by adding a temporal motion vector, MVTemp, to the location of the current block within the picture;

determine that the motion information extends beyond a boundary of an independently coded spatial region within a reference picture, the reference picture preceding the current picture in the temporal presentation order;

in response to the determination, clip the motion information;

identify a location of a co-located block within the reference picture based on the clipped motion information, wherein the co-located block is within the independently coded spatial region of the reference picture;

determine a motion vector for the co-located block in the reference picture; and

predict the current block based on the motion vector from the co-located block.

2 . The video decoder of claim 1 , wherein the at least one processor is further configured to scale the motion vector from the co-located block according to temporal differences of involved pictures.

3 . The video decoder of claim 1 , wherein the motion information is clipped to be within CTU boundaries of the current block.

4 . The video decoder of claim 1 , wherein the at least one processor is further configured to decode a reference picture index for the reference picture from a data stream.

5 . The video decoder of claim 1 , wherein the at least one processor is further configured to decode a motion vector prediction residual from a data stream.

6 . The video decoder of claim 1 , wherein the independently coded spatial region is a tile.

7 . The video decoder of claim 1 , wherein the at least one processor is further configured to select the predicted a motion vector as a selected candidate from a motion vector candidate list based on an index from a data stream.

8 . The video decoder of claim 7 , wherein the at least one processor is further configured to add a motion vector prediction residual from the data stream to the selected candidate to produce a motion vector for the current block.

9 . A method for video decoding, the method comprising:

identifying a location of a current block within a current picture, wherein the current picture is one of a sequence of pictures in temporal presentation order;

deriving motion information for the current block by adding a temporal motion vector, MVTemp, to the location of the current block within the picture;

determining that the motion information extends beyond a boundary of an independently coded spatial region within a reference picture, the reference picture preceding the current picture in the temporal presentation order;

in response to the determination, clipping the motion information;

identifying a location of a co-located block within the reference picture based on the clipped motion information, wherein the co-located block is within the independently coded spatial region of the reference picture;

determining a motion vector for the co-located block in the reference picture; and

predicting the current block by based on the motion vector from the co-located block.

10 . The method of claim 9 , further comprising scaling the motion vector from the co-located block according to temporal differences of involved pictures.

11 . The method of claim 9 , wherein the motion information is clipped to be within CTU boundaries of the current block.

12 . The method of claim 9 , further comprising decoding a reference picture index for the reference picture from a data stream.

13 . The method of claim 9 , further comprising decoding a motion vector prediction residual from a data stream.

14 . The method of claim 9 , wherein the independently coded spatial region is a tile.

15 . The method of claim 9 , further comprising selecting a motion vector as a selected candidate from a motion vector candidate list based on an index from a data stream.

16 . The method of claim 15 , further comprising adding a motion vector prediction residual from the data stream to the selected candidate to produce a motion vector for the current block.

17 . A non-transitory digital storage medium having computer program instructions stored thereon, that when executed causes at least one processor to:

identify a location of a current block within a current picture, wherein the current picture is one of a sequence of pictures in temporal presentation order;

derive motion information for the current block by adding a temporal motion vector, MVTemp, to the location of the current block within the picture;

determine that the motion information extends beyond a boundary of an independently coded spatial region within a reference picture, the reference picture preceding the current picture in the temporal presentation order;

in response to the determination, clip the motion information;

identify a location of a co-located block within the reference picture based on the clipped motion information, wherein the co-located block is within the independently coded spatial region of the reference picture;

determine a motion vector for the co-located block in the reference picture; and

predicting the current block based on the motion vector from the co-located block.

18 . The non-transitory digital storage medium of claim 17 , further comprising instructions that when executed cause the at least one processor to scale the motion vector from the co-located block according to temporal differences of involved pictures.

19 . The non-transitory digital storage medium of claim 17 , wherein the motion information is clipped to be within CTU boundaries of the current block.

20 . The non-transitory digital storage medium of claim 17 , further comprising instructions that when executed cause the at least one processor to decode a reference picture index for the reference picture from a data stream.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (21)