Patent ID: 8964855
Filing Date: 2015-02-24
Classification: H04L,H04N

Abstract:
1. A transmission apparatus provided to code and transmit video data, the transmission apparatus comprising: a memory; and a processor coupled to the memory which executes the following: transmitting to a receiving apparatus a plurality of frames including a first frame and a second frame which is coded by a forward directional prediction coding mode, and one or more frames being transmitted between the first frame and the second frame; receiving a packet including reception state information from a receiving apparatus after the first frame is transmitted by a transmission unit and before the second frame is transmitted by the transmission unit; detecting that an error on the first frame is detected by the receiving apparatus, based on the received reception state information; identifying, in accordance with the reception state information received from the receiving apparatus, the second frame to be transmitted to the receiving apparatus after the first frame and one or more frames are transmitted; specifying, when an error on the first frame is detected by the receiving apparatus, a size of the square part based on a number of frames which are transmitted between a transmission of the first frame and a transmission of the second frame, a position of a center of the square part on the second frame corresponding to a position of a center of the error area on the first frame; and coding the square part of the second frame by an intra image coding mode without referring to first video data in the first frame and video data in a frame between the first frame and the second frame, and to code the other part of the second frame by the forward directional prediction coding mode with referring to first video data in the first frame or video data in a frame between the first frame and the second frame; and transmitting the coded second frame to the receiving apparatus after the reception state information is received.