Image encoding/decoding method and apparatus, and recording medium storing bitstream

An image encoding method comprising:

• obtaining a stream including subpicture information of a plurality of subpictures;
• selecting a first subpicture to be extracted from among the plurality of subpictures;
• and
• obtaining a sub stream for the first subpicture from the stream, by removing or using at least one piece of subpicture information included in the stream,
• wherein the subpicture information comprises at least one of sequence parameter set (SPS) information or picture parameter set information (PPS),
• wherein the sub stream is obtained without changing at least one piece of subpicture information of the first subpicture, and
• wherein the unchanged subpicture information comprises information indicating whether to treat a subpicture as a picture.

A non-transitory computer-readable recording medium having stored therein a sub stream received by an image decoding apparatus and used to reconstruct a current block included in a current picture, the sub stream being generated by an image encoding method, the image encoding method comprising:

• obtaining a single stream including subpicture information of a plurality of subpictures;
• selecting a first subpicture to be extracted from among the plurality of subpictures;
• and
• obtaining a sub stream for the first subpicture from the stream, by removing or using at least one piece of subpicture information included in the stream,
• wherein the subpicture information comprises at least one of sequence parameter set (SPS) information or picture parameter set information (PPS),
• wherein the sub stream is obtained without changing at least one piece of subpicture information of the first subpicture, and
• wherein the unchanged subpicture information comprises information indicating whether to treat a subpicture as a picture.