Processing a video frame having slices and tiles

Patent metadata

Field	Value
Publication number	US-11805253-B2
Application number	US-202217895159-A
Country	US
Kind code	B2
Filing date	Aug 25, 2022
Priority date	Jul 11, 2011
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

A method for decoding video includes receiving a frame of the video that includes at least one slice and at least one time. Each of the at least one slice and the at least one tile are not all aligned with one another. Each of the at least one slice is characterized that it is decoded independently of the other the at least one slice. Each of the at least one tile is characterized that it is a rectangular region of the frame and having coding units for the decoding arranged in a raster scan order. The at least one tile of the frame are collectively arranged in a raster scan order of the frame.

First claim

We claim:

1. A method for decoding a video frame, the method comprising:
receiving a bitstream representative of the video frame, where the video frame comprises a plurality of slices and a plurality of tiles, whereby, a tile is a rectangular region of the video frame which includes a plurality of rows of coding units arranged in a raster scan order;
decoding a first syntax element from a picture parameter set of the video frame, the first syntax element indicating whether or not a plurality of tiles are used in the video frame;
decoding, in a case when the first syntax element indicates a plurality of tiles are used in the video frame, a second syntax element from a slice header of at least one slice of the plurality of slices, indicating whether or not a bitstream location information for at least one tile of the plurality of tiles is transmitted in the slice header of the at least one slice;
decoding, in a case when the second syntax element indicates the bitstream location information for the at least one tile of the plurality of tiles is transmitted in the slice header, a third syntax element from the slice header of the at least one slice, the third syntax element indicating a bit length for a bitstream location value, whereby the bit length represents a number of bits used to identify the bitstream location value; and
decoding, in a case when the second syntax element indicates the bitstream location information for the at least one tile of the plurality of tiles is transmitted in the slice header, and based on the bit length for the bitstream location value, the bitstream location value for a tile of the plurality of tiles.

2. The method of claim 1 , wherein the bitstream location value indicates a byte location of the tile in the bitstream.

3. The method of claim 1 further comprising:
decoding the tile by decoding the plurality of rows of coding units in the tile in the raster scan order.

4. A decoding device for decoding a video frame comprising:
circuitry configured to:
receive a bitstream representative of the video frame, where the video frame comprises a plurality of slices and a plurality of tiles, whereby, a tile is a rectangular region of the video frame which includes a plurality of rows of coding units arranged in a raster scan order;
decode a first syntax element from a picture parameter set of the video frame, the first syntax element indicating whether or not a plurality of tiles are used in the video frame;
decode, in a case when the first syntax element indicates a plurality of tiles are used in the video frame, a second syntax element from a slice header of at least one slice of the plurality of slices, indicating whether or not a bitstream location information for at least one tile of the plurality of tiles is transmitted in the slice header of the at least one slice;
decode, in a case when the second syntax element indicates the bitstream location information for the at least one tile of the plurality of tiles is transmitted in the slice header, a third syntax element from the slice header of the at least one slice, the third syntax element indicating a bit length for a bitstream location value, whereby the bit length represents a number of bits used to identify the bitstream location value; and
decode, in a case when the second syntax element indicates the bitstream location information for the at least one tile of the plurality of tiles is transmitted in the slice header, and based on the bit length for the bitstream location value, the bitstream location value for a tile of the plurality of tiles.

5. The decoding device of claim 4 , wherein the bitstream location value indicates a byte location of the tile in the bitstream.

6. The decoding device of claim 4 , wherein the circuitry is further configured to:
decode the tile by decoding the plurality of rows of coding units included in the tile in the raster scan order.

7. A non-transitory computer readable medium storing instructions which when executed cause a computer to perform a method of decoding a video frame, the method comprising:
receiving a bitstream representative of the video frame, where the video frame comprises a plurality of slices and a plurality of tiles, whereby, a tile is a rectangular region of the video frame which includes a plurality of rows of coding units arranged in a raster scan order;
decoding a first syntax element from a picture parameter set of the video frame, the first syntax element indicating whether or not a plurality of tiles are used in the video frame;
decoding, in a case when the first syntax element indicates a plurality of tiles are used in the video frame, a second syntax element from a slice header of at least one slice of the plurality of slices, indicating whether or not a bitstream location information for at least one tile of the plurality of tiles is transmitted in the slice header of the at least one slice;
decoding, in a case when the second syntax element indicates the bitstream location information for the at least one tile of the plurality of tiles is transmitted in the slice header, a third syntax element from the slice header of the at least one slice, the third syntax element indicating a bit length for a bitstream location value, whereby the bit length represents a number of bits used to identify the bitstream location value; and
decoding, in a case when the second syntax element indicates the bitstream location information for at least one tile of the plurality of tiles is transmitted in the slice header, and based on the bit length for the bitstream location value, the bitstream location value of a tile of the plurality of tiles.

8. The non-transitory computer readable medium of claim 7 , wherein the bitstream location value indicates a byte location of the tile in the bitstream.

9. The non-transitory computer readable medium of claim 7 , wherein the method further comprises:
decoding the tile by decoding the plurality of rows of coding units in the tile in the raster scan order.

10. A method for encoding a video frame, the method comprising generating a bitstream representative of the video frame, where the video frame comprises a plurality of slices and a plurality of tiles, and whereby a tile is a rectangular region of the video frame which includes a plurality of rows of coding units arranged in a raster scan order, and the method further comprising:
encoding a first syntax element into a picture parameter set portion of the bitstream, the first syntax element indicating whether or not a plurality of tiles are used in the video frame;
encoding, in a case when the first syntax element indicates a plurality of tiles are used in the video frame, a second syntax element into a portion of the bitstream corresponding to a slice header of at least one slice of the plurality of slices, the second syntax element indicating whether or not a bitstream location information for at least one tile of the plurality of tiles is transmitted in the slice header of the at least one slice;
encoding, in a case when the second syntax element indicates the bitstream location information for the at least one tile of the plurality of tiles is transmitted in the slice header, a third syntax element into the slice header of the bitstream, the third syntax element indicating a bit length for a bitstream location value, whereby the bit length represents a number of bits used to identify the bitstream location value; and
encoding, in a case when the second syntax element indicates the bitstream location information for the at least one tile of the plurality of tiles is transmitted in the slice header, and based on the bit length for the bitstream location value, the bitstream location value

Assignees

• Velos Media Llc

Inventors

• Misra Kiran
• Segall Christopher

Classifications

• H04N19/124 Primary

  Quantisation · CPC title

• H04N19/105

  Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction · CPC title

• H04N19/117

  Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) · CPC title

• H04N19/13

  Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC] · CPC title

• H04N19/159

  Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction · CPC title