Patent ID: 7385921

Claim:
A data transmission apparatus for storing image data in a packet and for transmitting the packet, comprising: encoding parts for applying scalable-encoding processing by using wavelet transform to an image signal; data receiving parts for receiving receiving-terminal information from a data receiving apparatus; and packet generation parts for generating a packet which stores scalable-encoded data generated by the encoding parts and for specifying priority-level information corresponding to a layer of the scalable-encoded data of the image signal, stored in the generated packet, as additional information of the generated packet, wherein the packet generation parts dynamically specify the priority-level information corresponding to the layer of the scalable-encoded data of the image signal, stored in the generated packet, as additional information of the generated packet, according to a priority-level setting map in which the layer of the scalable-encoded data is associated with a level of priority and according to the receiving-terminal information, wherein a first layer of the scalable-encoded data associated with a high level of priority includes a first data area of scalable-encoded data of the image signal, and a second layer of the scalable-encoded data associated with a low level of priority includes the first data area and a second data area of scalable-encoded data of the image signal.