Patent ID: 8792548
Filing Date: 2014-07-29
Classification: H04N

Abstract:
1. A transmission method for transmitting a video signal over a communication network, comprising the following steps: pre-coding the video signal using hierarchical coding thereby obtaining pre-coded video signal, the pre-coded video signal being constituted by data distributed into a plurality of hierarchical levels; periodically estimating a bandwidth of the communication network over evaluation periods; selecting, for a current evaluation period, a set of hierarchical levels in the plurality of hierarchical levels constituting the pre-coded video signal, wherein a transmission rate of the data of the selected hierarchical levels is compatible with the bandwidth estimated for the current evaluation period; estimating a change tendency of the bandwidth for a following evaluation period; determining additional data of the video signal to transmit depending on the estimated change tendency of the bandwidth, wherein the additional data are chosen from among data of the current evaluation period or data of the following evaluation period, wherein if the bandwidth for the following evaluation period has a tendency to increase, the additional data are chosen in at least one hierarchical level higher than the set of hierarchical levels selected for the current evaluation period, and wherein if the bandwidth for the following evaluation period has a tendency to decrease, the additional data are chosen from among at least one hierarchical level of the following evaluation period, wherein the hierarchical level is identical to a hierarchical level of the set of hierarchical levels selected for the current evaluation period; and transmitting the data of the selected hierarchical levels and the determined additional data during the current evaluation period.