Method and device for generating a description file, and corresponding streaming method

A communication method to transmit a video having a plurality of image frames from a first communication apparatus to another communication apparatus, wherein the first communication apparatus:

• receive, by a reception unit, from the another communication apparatus a request for description data;
• transmit, by a first transmission unit, to the another communication apparatus which transmits the request for description data received by the reception unit, description data including first positional information indicating a spatial position of a partial region in a first image frame among the plurality of images frames;
• and
• transmit, by a second transmission unit, image data which is encapsulated in order to allow an independent transmission of an image of the partial region to the another communication apparatus based on a request from the another communication apparatus which receives the description data transmitted by the transmission unit,
• wherein the first positional information is represented by top left corner position followed by width and height.

A communication apparatus that receives a video having a plurality of image frames from another communication apparatus, the communication apparatus comprising:

• a transmission unit configured to transmit to the another communication apparatus a request for description data;
• a reception unit configured to receive, from the another communication apparatus which receives the request for description data transmitted by the transmission unit, description data including first positional information indicating a spatial position of a partial region in a first image frame among the plurality of image frames;
• and
• wherein the transmission unit is further configured to transmit a request for the independent transmission of an image of the partial region determined in the first image frame, and
• wherein the first positional information is represented by top left corner position followed by width and height.

A communication method to receive, by a communication apparatus, a video having a plurality of image frames from another communication apparatus, wherein the communication apparatus:

• transmit, by a transmission unit, to the another communication apparatus a request for description data;
• receive, by a reception unit, from the another communication apparatus which receives the request for description data transmitted by the transmission unit, description data including first positional information indicating a spatial position of a partial region in a first image frame among the plurality of image frames;
• and
• transmit, by the transmission unit, a request for the independent transmission of an image of the partial region determined in the first image frame,
• wherein the first positional information is represented by top left corner position followed by width and height.