METHOD OF TRANSMITTING A PRE-CODED VIDEO SIGNAL OVER A COMMUNICATION NETWORK
First Claim
1. A transmission method for transmitting, over a communication network, a video signal pre-coded using hierarchical coding, said signal being constituted by data distributed into several hierarchical levels, comprising the following steps:
- periodically estimating the bandwidth of the communication network over evaluation periods; and
for a current evaluation period selecting a set of hierarchical levels, the transmission rate of the data of said selected hierarchical levels being compatible with the bandwidth estimated for said current evaluation period;
further comprising the following steps;
estimating a change tendency of said bandwidth for a following evaluation period;
determining additional data of said video signal to transmit depending on said estimated change tendency of the bandwidth; and
transmitting the data of the selected hierarchical levels and said determined additional data during said current evaluation period.
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Abstract
A transmission method for transmitting, over a communication network, a video signal pre-coded using hierarchical coding comprises the steps of periodically estimating (S41) the bandwidth (BW(t)) of the communication network over evaluation periods, and for a current evaluation period, selecting (S42) a set of hierarchical levels (Li(t)), compatible with the estimated bandwidth (BW(t)).
It further comprises the steps (S43, S44) of estimating a change tendency of the bandwidth (BW); of determining (S50, S60) additional data of the video signal to transmit depending on the estimated change tendency of the bandwidth; and of transmitting (S51, S54, S55, S61, S64, S65) the data of the selected hierarchical levels and determined additional data during the current evaluation period.
Use among others for transmitting a signal coded in accordance with the SVC standard.
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Citations
18 Claims
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1. A transmission method for transmitting, over a communication network, a video signal pre-coded using hierarchical coding, said signal being constituted by data distributed into several hierarchical levels, comprising the following steps:
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periodically estimating the bandwidth of the communication network over evaluation periods; and for a current evaluation period selecting a set of hierarchical levels, the transmission rate of the data of said selected hierarchical levels being compatible with the bandwidth estimated for said current evaluation period; further comprising the following steps; estimating a change tendency of said bandwidth for a following evaluation period; determining additional data of said video signal to transmit depending on said estimated change tendency of the bandwidth; and transmitting the data of the selected hierarchical levels and said determined additional data during said current evaluation period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15, 16, 17, 18)
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12. A transmission device for transmitting, over a communication network, a video signal pre-coded using hierarchical coding, said signal being constituted by data distributed into several hierarchical levels, comprising:
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a unit configured to periodically estimate the bandwidth of the communication network over evaluation periods; and for a current evaluation period, a unit configured to select a set of hierarchical levels, the transmission rate of the data of said selected hierarchical levels being compatible with the bandwidth estimated for said current evaluation period; further comprising; a unit configured to estimate a change tendency of said bandwidth for a following evaluation period; a unit configured to determine additional data of said video signal to transmit depending on said estimated change tendency of the bandwidth; and a unit configured to transmit the data of the selected hierarchical levels and said determined additional data during said current evaluation period. - View Dependent Claims (13, 14)
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Specification