US 8,275,051 B2 · Feedback based scalable video coding

Abstract

A system and method provides a first integrity check code that can be calculated at an encoder and then sent to a decoder as a supplemental enhancement information message. The decoder can then calculate a second integrity check code over the actual received network abstraction layer units. This second integrity check code can be compared with the encoder-generated first integrity check code sent via the supplemental enhancement information message to indicate if in fact all of the transmitted NAL units from which the integrity check code was generated have been received without changes in their content. In addition, an error tracking algorithm is provided that can be run at either the encoder or the decoder in order to determine if the network abstraction layer units are correct in content at the decoder level. Therefore, pictures that are sent as just intra coded frames and pictures that are sent as just inter coded frames can both be checked for errors. Hence, error checking can be provided in those situations where the decoder fails to provide adequate information to the encoder as to what has actually been decoded.

Claims43

Dependent claims

A method comprising:

encoding a picture to a first access unit, by:
generating, by an encoder, a first integrity check code over a first set of data units, the first set of data units comprising at least a portion of the first access unit, wherein the first set of data units includes at least one data unit having a quality identifier greater than zero in a dependency unit such that the picture is decodable even if the at least one data unit is at least one of discarded and truncated, wherein the quality identifier indicates the quality level of the at least one data unit, and
conveying, by the encoder, at least the first integrity check code to a decoder.

A system, comprising:

an encoder configured to encode a picture to a first access unit by at least generating a first scope and a first integrity check code over a first set of data units, the first set of data units comprising at least a portion of the first access unit, wherein the first set of data units includes at least one data unit having a quality_identifier greater than zero in a dependency unit such that the picture is decodable even if the at least one data unit is at least one of discarded and truncated, wherein the quality_identifier indicates the quality level of the at least one data unit, and wherein a dependency unit comprises the data units of the first set of data units having each an identical dependency identifier value;
and
a decoder configured to decode the first access unit comprising a picture by receiving a first scope characterizing a first set of data units comprising at least a portion of the first access unit and a first integrity check code associated with the first access unit, the first integrity check code being generated over the first set of data units, and generating a second integrity check code over the first set of data units, wherein the first set of data units includes at least one data unit having a quality_identifier greater than zero in a dependency unit wherein the picture is decodable if the at least one data unit is at least one of discarded and truncated, wherein the quality_identifier indicates the quality level of the at least one data unit, and wherein a dependency unit comprises the data units of the first set of data units having each an identical dependency identifier value.

Dependencies are inferred from the claim text.

Feedback based scalable video coding

Life of this patent

Feedback based scalable video coding

Life of this patent

Abstract

Claims43