Method and device for selecting data in a communication network

A device for selecting data of a compressed digital signal comprising a plurality of levels of spatial granularity of data, in a communication network comprising at least two communication apparatuses connected together by the network, the digital signal being available at least at one, so-called first, of the communication apparatuses, the data being adapted to be transmitted from the first apparatus to the other, so-called second, communication apparatus, and that data being sufficient to reconstitute a spatial part of the signal termed region of interest which is specified at the second apparatus, characterized in that the device comprises:

• means for determining a set of data necessary to satisfy a request and not yet received by the second communication apparatus, taking into account the data received previously by that apparatus;
• means for determining at least one level of spatial granularity of data as a function of the region of interest and of the structure and organization of the data in the signal;
• and
• means for selecting data for each determined level of granularity as a function of the region of interest and of the structure and organization of the data in the signal;
• wherein, determining at least one level of spatial granularity depends on the determined set of data, the minimum quantity of data to be received by the second apparatus to reconstitute the region of interest, and the total quantity of data present in the signal, including precincts that overlap the region of interest and precincts that do not overlap the region of interest.

A method of selecting data of a compressed digital signal comprising a plurality of levels of spatial granularity of data, in a communication network comprising at least two communication apparatuses connected together by the network, the digital signal being available at least at one, so-called first, of the communication apparatuses, the data being adapted to be transmitted from the first apparatus to the other, so-called second, communication apparatus, and that data being sufficient to reconstitute a spatial part of the signal termed region of interest which is specified at the second apparatus, characterized in that the method comprises the following steps:

• determining a set of data necessary to satisfy a request and not yet received by the second communication apparatus, taking into account the data received previously by that apparatus;
• comparing, with respect to a threshold, the ratio of a sum of the quantity of data already present on the second apparatus plus a minimum quantity of data to be received by the second apparatus to reconstitute the region of interest, to a total quantity of data present in the signal, the data of the ratio corresponding to a given level of spatial granularity;
• determining at least one level of spatial granularity of data as a function of the region of interest and of the structure and organization of the data in the signal;
• and
• selecting data for each determined level of granularity as a function of the region of interest and of the structure and organization of the data in the signal;
• wherein, determining at least one level of spatial granularity depends on the determined set of data, the minimum quantity of data to be received by the second apparatus to reconstitute the region of interest, and the total quantity of data present in the signal.

A device for selecting data of a compressed digital signal comprising a plurality of levels of spatial granularity of data, in a communication network comprising at least two communication apparatuses connected together by the network, the digital signal being available at least at one, so-called first, of the communication apparatuses, the data being adapted to be transmitted from the first apparatus to the other, so-called second, communication apparatus, and that data being sufficient to reconstitute a spatial part of the signal termed region of interest which is specified at the second apparatus, characterized in that the device comprises:

• means for determining a set of data necessary to satisfy a request and not yet received by the second communication apparatus, taking into account the data received previously by that apparatus;
• means for comparing, with respect to a threshold, a ratio of a sum of the quantity of data already present on the second apparatus plus a minimum quantity of data to be received by the second apparatus to reconstitute the region of interest, to a total quantity of data present in the signal, the data of the ratio corresponding to a given level of spatial granularity;
• means for determining at least one level of spatial granularity of data as a function of the region of interest and of the structure and organization of the data in the signal;
• and
• means for selecting data for each determined level of granularity as a function of the region of interest and of the structure and organization of the data in the signal;
• wherein, determining at least one level of spatial granularity depends on the determined set of data, the minimum quantity of data to be received by the second apparatus to reconstitute the region of interest, and the total quantity of data present in the signal.