US 2009/0213939 A1 · Video Coding Method And Device

Abstract

A video coding method, comprising the following steps: a) successive images (F) of a video sequence are coded to generate coding parameters, b) the coding parameters are included in an output stream (Φ) to be transmitted to a station (B) including a decoder (2), c) back channel information on reconstruction of the images of the video sequence by the decoder is received from said station, d) the back channel information is analyzed in order: d1) to identify a reconstructed image that includes a portion that has been lost in the decoder, d2) to identify in the subsequent coded images between said reconstructed image and a current image to be coded an image portion that refers to said lost portion identified in the step d1), e) said current image of the video sequence is coded in a coding mode that is a function of the identification or non-identification of a lost portion in the step d).

Claims13

Dependent claims

A video coding method, comprising the steps of:

a) coding successive images (F) of a video sequence to generate coding parameters;
b) including the coding parameters in an output stream (Φ) to be transmitted to a station (B) including a decoder (2);
c) receiving from said station back channel information on reconstruction of the images of the video sequence by the decoder;
d) analyzing the back channel information in order to identify among the reconstructed images a reconstructed image that includes a portion that has been lost in the decoder, and in the event of such identification, to identify in the subsequent coded images between said reconstructed image and a current image to be coded an image portion that refers to the lost portion of said reconstructed image;
and
e) coding said current image of the video sequence:
e1) in a first coding mode if at least a portion of the image has been identified as lost in the step d′;
e2) in a second coding mode if no reconstructed image has been identified in the step d) as including a lost portion.

5 more elements

A video coder (1) comprising:

means (5-8, 10, 15) for coding successive images of a video sequence to generate coding parameters;
means (9) for forming an output stream (D) of the coder to be transmitted to a station (B) including a decoder (2), the output stream including said coding parameters;
means for receiving from said station back channel information on reconstruction by the decoder of images of the video sequence;
and
means (10) for analyzing back channel information, comprising identification means (16-17) for identifying among the reconstructed images a reconstructed image that includes a portion that has been lost in the decoder and, where applicable, for identifying in the subsequent coded images between said reconstructed image and a current image to be coded an image portion that refers to the lost portion of said reconstructed image;
and
means for coding said current image of the video sequence:
in a first coding mode if at least a portion of the image has been identified as lost by the identification means;
and
in a second coding mode if that no reconstructed image has been identified by the identification means as including a lost portion.

7 more elements

Dependencies are inferred from the claim text.

Video Coding Method And Device

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Video Coding Method And Device

Life of this patent

Abstract

Claims13