H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/26 (2006.01)
Patent
CA 2739856
The invention relates to a method for optimising a video transmission in a difficult environment, said method including a video encoder for encoding video data to be transmitted, characterised in that said method comprises at least one step for determining one or more compression parameters for the video encoder in question in order to transmit said video data at a given rate Di or for a given quality Qi by executing at least the following steps: defining and using reference nomograms for the encoder in question; predicting, for the portion of the video sequence being compressed and using said reference nomograms, compression parameters to be used, i.e. at least the quantification rate QP, by selecting a nomogram in the representation (QP, flow) or (QP; PSNR) which, for the flow Di or quality Qi target range, is the closest in terms of distance from said portion of the sequence to be compressed while respecting a given margin; updating the prediction step by an iterative method in order to close in on the best parameter choice, said iteration method including at least one compression step followed by a verification step; and compressing the video data to be transmitted using said parameters.
Method for optimizing a video transmission in a constrained environment comprising a video coder adapted for coding the video data to be transmitted,, characterized in that it comprises at least one step of determining one or more compression parameters for the video coder considered so as to transmit said video data at a given throughput Di or for a given quality Qi by executing at least the following steps: - define and use reference charts for said coder considered, - predict for the part of the video sequence undergoing compression, and by means of said reference charts, compression parameters to be used, at least the quantization intervai QP, by selecting a chart in the (QP, throughput) or (QP, PSNR) representation which for the targeted range of throughput Di or of quality Qi, is the closest in distance to said part of the sequence to be compressed, while complying with a given margin, - update with an iterative method the prediction step so as to converge on the best choice of parametrization, said iteration method being composed of at least one compression step followed by a verification step, - compress the video data to be transmitted with said parameters.
Gadat Benjamin
Lamy-Bergot Catherine
Marks & Clerk
Thales
LandOfFree
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