Abstract: A reception apparatus and method is disclosed wherein recovery of a lost packet can be performed simply and rapidly in response to the variation of the loss rate. A packet analysis section detects loss of a packet, and a retransmission processing section registers packet information including a sequence number for identification of a packet having been lost into a NACK list. When loss of a packet is detected by the packet analysis section, a NACK production section produces a NACK packet for requesting for retransmission of the non-arriving packet whose packet information is registered in the NACK list. A network inputting/outputting section transmits the NACK packet to a transmission apparatus. The invention can be applied to a reception apparatus which receives, for example, streaming data.

Abstract: The present invention relates to a transmission and reception system, a transmission apparatus and transmission method, a reception apparatus and reception method, a recording medium, and a program in which, even when received image data has defects, a good-quality image can be displayed. A reception control section 147 detects a loss from image data received by a communication section 141 and permits reception according to the loss. When reception is permitted, the communication section 141 holds the image data in a buffer. A decoder control section 152 permits decoding according to a threshold value held in a threshold-value holding section 151. When decoding is permitted, a decoder 143 decodes the image data held in the buffer 142 and holds the data in a frame memory 144. A display control section 145 controls a display section 146 so as to display an image in accordance with the image data held in the frame memory 144. The present invention can be applied to an image distribution system.

Abstract: A picture transmitting apparatus transmits, to a picture receiving apparatus, a picture as a predetermined area of an omnidirectional picture. The picture receiving apparatus displays a portion of the transmitted picture which corresponds to a viewpoint. When the viewpoint is moved, information of the movement is transmitted from the picture receiving apparatus to the picture transmitting apparatus, and a picture corresponding to the new viewpoint is transmitted from the picture transmitting apparatus to the picture receiving apparatus. The picture receiving apparatus displays a portion of the received picture which corresponds to the viewpoint.

Abstract: JPEG-2000 data is formatted into RTP packets for transmission through the Internet. A priority field is provided in the format, and a value indicating the importance of a code stream included in a packet is stored therein. A type field indicates a payload type of a JPEG-2000 code stream. An mh_id field is provided as an identifier of a main header of the JPEG-2000 code stream and indicates a change in the main header. An mh_length field indicates the length of the main header and a fragment offset field stores the number of offset bytes from the start of an image of the packet.