Overlay processing method in 360 video system, and device thereof

A 360-degree image data processing method performed by a 360-degree video transmitting device, the method comprising:

• acquiring a 360-degree image;
• deriving a picture by processing the 360-degree image;
• generating metadata related to the 360-degree image;
• encoding the picture;
• and
• performing processing for storing or transmission of the encoded picture and the metadata,
• wherein the metadata includes overlay related metadata, and
• wherein the overlay related metadata includes information on a region of the overlay.

A 360-degree video receiving device, the device comprising:

• a reception processor receiving 360-degree image data and acquiring information on an encoded picture and metadata from the 360-degree image data;
• a data decoder decoding a picture based on the information on the encoded picture;
• and
• a renderer rendering the decoded picture and an overlay based on the metadata,
• wherein the metadata includes overlay related metadata,
• wherein the renderer renders the overlay based on the overlay related metadata, and
• wherein the overlay related metadata includes information on a region of the overlay.