Method for slice, tile and brick signaling

A system for decoding a coded video stream, the system comprising:

• memory configured to store computer program code;
• and
• at least one processor configured to receive the coded video stream, the coded video stream including a picture partitioned into first sub-picture units including:
• one first sub-picture unit, and
• an additional first sub-picture unit including a first ordered second sub-picture unit, from among second sub-picture units of the additional first sub-picture unit, and a last ordered second sub-picture unit, from among the second sub-picture units of the additional first sub-picture unit,
• wherein the at least one processor is further configured to access the computer program code, and operate as instructed by the computer program code, the computer program code comprising decoding code configured to cause the at least one processor to:
• obtain index values of the first ordered second sub-picture unit and the last ordered second sub-picture unit of the additional first sub-picture unit, without the coded video stream explicitly signaling the index values and a difference value between the index values of the first ordered second sub-picture unit and the last ordered second sub-picture unit to the at least one processor, and
• wherein the additional first sub-picture unit has an order value that is subsequent to an order value of the one first sub-picture unit.

A non-transitory computer-readable medium storing computer instructions that, when executed by at least one processor, cause the at least one processor to:

• decode a picture from a coded video stream that includes the picture partitioned into first sub-picture units that include:
• one first sub-picture unit, and
• an additional first sub-picture unit including a first ordered second sub-picture unit, from among second sub-picture units of the additional first sub-picture unit, and a last ordered second sub-picture unit, from among the second sub-picture units of the additional first sub-picture unit,
• wherein the instructions are configured to cause the at least one processor to decode the picture by obtaining index values of the first ordered second sub-picture unit and the last ordered second sub-picture unit of the additional first sub-picture unit, without the coded video stream explicitly signaling the index values and a difference value between the index values of the first ordered second sub-picture unit and the last ordered second sub-picture unit to the at least one processor, and
• wherein the additional first sub-picture unit has an order value that is subsequent to an order value of the one first sub-picture unit.