Image encoding/decoding method and apparatus based on subpicture information aligned between layers, and recording medium storing bitstream

An image encoding method performed by an image encoding apparatus, the image encoding method comprising:

• partitioning, by the image encoding apparatus, a current picture into one or more subpictures;
• generating, by the image encoding apparatus, a subpicture information on the one or more subpictures;
• and
• generating, by the image encoding apparatus, a bitstream by encoding image information including the subpicture information,
• wherein the subpicture information comprises a first flag specifying whether each of the one or more subpictures is treated as a picture,
• wherein, based on the bitstream including at least one first layer referring to a current layer including the current picture, the first flag for a first subpicture included in the first layer and the first flag for the current subpicture have the same value, and
• wherein the first subpicture corresponds to the current subpicture.

A method for transmitting a bitstream, the method comprising:

• obtaining, by an encoding apparatus, the bitstream generated by an image encoding method;
• and
• transmitting, by an encoding apparatus, the bitstream,
• wherein the image encoding method comprising:
• partitioning a current picture into one or more subpictures;
• generating a subpicture information on the one or more subpictures;
• and
• generating a bitstream by encoding image information including the subpicture information,
• wherein the subpicture information comprises a first flag specifying whether each of the one or more subpictures is treated as a picture,
• wherein, based on the bitstream including at least one first layer referring to a current layer including the current picture, the first flag for a first subpicture included in the first layer and the first flag for the current subpicture have the same value, and
• wherein the first subpicture corresponds to the current subpicture.