Method and apparatus for signaling slice partition information in image and video coding

An apparatus for decoding a video sequence, the apparatus comprising one or more electronic circuits or processors arranged to:

• receive a video bitstream comprising a current picture;
• parse picture partition information from the video bitstream, wherein the current picture is partitioned into one or more slices and one or more tiles according to the picture partition information;
• determine a control syntax indicating whether in-loop filtering across slice boundaries is enabled, wherein parsing of the control syntax from the video bitstream is bypassed when each of the following is met:
• the picture partition information indicates that a rectangular slice mode is selected, each sub picture is allowed to contain more than one rectangular slice, and the current picture contains only one rectangular slice in the current picture;
• derive a reconstructed picture from the video bitstream, wherein the reconstructed picture comprises picture partition according to the picture partition information;
• and
• apply in-loop filtering across slice boundaries when the picture partition information indicates multiple slices existing in the current picture and the control syntax indicates the in-loop filtering across the slice boundaries being enabled.

A method for encoding a video sequence, the method comprising:

• receiving input data corresponding to a current picture;
• partitioning the current picture into one or more slices and/or one or more tiles;
• signaling picture partition information in a video bitstream;
• determining a control syntax indicating whether in-loop filtering across the slice boundaries is enabled, wherein signaling of the control syntax in the video bitstream is bypassed when each of the following is met:
• the picture partition information indicates that a rectangular slice mode is selected, each sub picture is allowed to contain more than one rectangular slice, and the current picture contains only one rectangular slice in the current picture;
• and
• applying in-loop filtering across slice boundaries when more than one slice exists in the current picture and the control syntax indicates the in-loop filtering across the slice boundaries being enabled.

An apparatus for encoding a video sequence, the apparatus comprising one or more electronic circuits or processors arranged to:

• receive input data corresponding to a current picture;
• partition the current picture into one or more slices and/or one or more tiles;
• signal picture partition information in a video bitstream;
• determine a control syntax indicating whether in-loop filtering across the slice boundaries is enabled, wherein signaling of the control syntax in the video bitstream is bypassed when each of the following is met:
• the picture partition information indicates that a rectangular slice mode is selected, each sub picture is allowed to contain more than one rectangular slice, and the current picture contains only one rectangular slice in the current picture;
• and
• apply in-loop filtering across slice boundaries when more than one slice exists in the current picture and the control syntax indicates the in-loop filtering across the slice boundaries being enabled.