Image coding/decoding method and device for selectively signaling filter availability information, and method for transmitting bitstream

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

• determining the number of tiles in a current picture based on partitioning of the current picture not being limited;
• determining a value of a first flag for filtering on a boundary of a tile based on the number of tiles in the current picture being plural;
• generating a bitstream including the first flag;
• determining whether the current picture consists of one slice as first information based on partitioning of the current picture not being limited;
• and
• determining a value of a second flag for filtering on a boundary of a slice based on the current picture not consisting of only one slice,
• wherein the first information on a slice constituting the current picture is included in the bitstream based on partitioning of the current picture not being limited, and
• wherein the second flag is included in the bitstream based on second information on the slice representing whether to apply rectangular slice mode to the current picture.

A method for transmitting a bitstream comprising:

• determining the number of tiles in a current picture based on partitioning of the current picture not being limited;
• determining a value of a first flag for filtering on a boundary of a tile based on the number of tiles in the current picture being plural;
• generating a bitstream including the first flag;
• determining whether the current picture consists of one slice as first information based on partitioning of the current picture not being limited;
• determining a value of a second flag for filtering on a boundary of a slice based on the current picture not consisting of only one slice;
• and
• transmitting the bitstream,
• wherein the first information on a slice constituting the current picture is included in the bitstream based on partitioning of the current picture not being limited, and
• wherein the second flag is included in the bitstream based on second information on the slice representing whether to apply rectangular slice mode to the current picture.