Granted Patent B2

US 12,382,059 · App. 18/604,341 · Granted Aug 5, 2025

Inventor: Michael Horowitz (Austin, TX)

Assignee: Dolby Laboratories Licensing Corporation

H04N19/139C12N9/0071C12P7/14C12P17/14C12Y114/00H04N19/103H04N19/105H04N19/117H04N19/137H04N19/159H04N19/172H04N19/174H04N19/196H04N19/436H04N19/44H04N19/46H04N19/50H04N19/61H04N19/70H04N19/80H04N19/82H04N19/91

Abstract

Claims (18)

1. An encoder for encoding a bitstream of coded pictures, comprising:

one or more processors and one or more storage devices storing instructions that are operable, when executed by the one or more processors, to cause the one or more processors to perform operations comprising:

receiving an uncoded picture;

encoding the uncoded picture into the bitstream as a first coded picture,

wherein the first coded picture comprises a plurality of coded tree blocks (CTBs),

wherein the first coded picture is segmented into at least two columns and at least two slices,

wherein each CTB belongs to both a respective column and a respective slice,

wherein a slice boundary in the first coded picture is not equal to a column boundary in the first coded picture and wherein all CTBs belonging to a first slice are located in exactly one column, and

wherein encoding the uncoded picture is performed using multiple columns and multiple slices, and wherein encoding the uncoded picture comprises:

for a slice of the multiple slices, encoding the CTBs in the slice in an order that is based on the respective columns to which the CTBs in the slice belong, and

breaking in-loop filtering within the first slice at a column boundary between adjacent columns of the multiple columns;

encoding, in a first picture parameter set in the bitstream, a value for a number of columns N minus one for the first coded picture of the bitstream; and

encoding, in the first picture parameter set in the bitstream, column width parameters pertaining to leftmost N−1 columns of the first coded picture, the column width parameters being measured in units of CTBs having a first size,

wherein the column width parameters pertaining to the leftmost N−1 columns determine a width of a rightmost column of the first coded picture, and

wherein the width of the rightmost column of the first coded picture is calculated using a width of the first coded picture and the column width parameters pertaining to the N−1 leftmost columns for the first coded picture.

2. The encoder of claim 1 , wherein the column width of at least one column is variable between at least two rows of CTBs in the first coded picture.

3. The encoder of claim 2 , wherein the variability is controlled by coding the column width in a slice header.

4. The encoder of claim 1 , wherein encoding the CTBs in the slice in an order that is based on the respective columns to which the CTBs in the slice belong comprises encoding the plurality of CTBs following a scan order of CTBs, according to which the plurality of CTBs are encoded sequentially by column from left-to-right across a plurality of columns, and sequentially by CTB from left-to-right and top-to-bottom within each of the plurality of columns.

Assignments (8)

Continuity (8)

References Cited (131)