초록 ▼

In order to transmit an inter-frame coded video signal, such as an MPEG-coded video signal, over a packet-based network such as the Internet, the video signal associated with at least one video frame, is split (102, 402) into a high priority partition and a low priority partition. A systematic forwa

In order to transmit an inter-frame coded video signal, such as an MPEG-coded video signal, over a packet-based network such as the Internet, the video signal associated with at least one video frame, is split (102, 402) into a high priority partition and a low priority partition. A systematic forward error erasure/correction (FEC) code (108), such as a Reed Solomon (n,k) code, is then applied to bytes in the high priority partition. The forward error/erasure corrected high priority partition bytes and the low priority partition bytes are then combined (110) into n packets for transmission over the packet network to a receiver/decoder. Each of the n transmitted packets contains a combination of both high priority partition data bytes and low priority partition information bytes. In k of those packets the high priority partition data bytes are all high priority partition information bytes and in n-k of those packets all the high priority partition data byte are parity bytes produced by the FEC coding. More specifically, for each high priority partition byte position within the n packets, the forward error/erasure correction code is applied using one high priority partition information byte from the same byte position in each of those k packets to determine n-k parity bytes, which are arranged, one byte per packet, in the n-k packets containing high priority partition parity bytes. If up to n-k packets are lost in transmission over the packet network to the receiver (500, 600), then the high priority partition bytes in such lost packets can be recovered to applying FEC decoding (506) to the high partition bytes in the received packets. The most visually significant information is thus protected against packet loss over the network.

대표청구항 ▼

1. A method of decoding a compression-coded video signal that has been packetized and transmitted over a packet-based network in a sequence of packets that are associated with at least one frame of the compression-coded video signal, the method comprising the steps of:receiving packets associated wi

1. A method of decoding a compression-coded video signal that has been packetized and transmitted over a packet-based network in a sequence of packets that are associated with at least one frame of the compression-coded video signal, the method comprising the steps of:receiving packets associated with the at least one frame of the compression-coded video signal, each of the received packets containing both low priority partition information bytes and forward error/erasure correction (FEC)-coded high priority partition data bytes associated with the at least one frame of the compression-coded video signal, the compression-coded video signal having been split into low priority and high priority partitions before being packetized and transmitted; determining which transmitted packets associated with the at least one frame of the video sequence have not been received; applying a FEC decoding to the FEC-coded high priority partition data bytes in the received packets to determine high priority partition information bytes associated with the at least one frame, the step of applying a FEC decoding reconstructing high priority partition information bytes in those packets determined not to have been received; combining the received low priority partition information bytes and the decoded and reconstructed high priority partition information bytes; and decompression-decoding the combined received low priority partition information bytes and the decoded and reconstructed high priority partition information bytes to reproduce the at least one frame of the video signal.