Refinement coefficient coding based on history of corresponding transform coefficient values

A device that decodes refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, the device comprising one or more processors and a memory configured to:

• receive an encoded bitstream;
• receive a signal indicating that a first subset of refinement coefficients, defined as refinement coefficients with a high probability of being zero, are not coded into the encoded bitstream;
• decode a second subset of refinement coefficients from the encoded bitstream, wherein the second subset of refinement coefficients are those that do not qualify as belonging to the first subset and wherein the second subset of refinement coefficients are those that do not define a high probability of being zero based on history of corresponding transform coefficient values associated with one or more previous layers of the SVC scheme;
• and
• generate information that estimates a particular refinement coefficient of the first subset of refinement coefficients based on assigned index values dependent upon the particular refinement coefficient values associated with the one or more previous layers of the SVC scheme, wherein the assigned index values are assigned for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig=(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable.

A non-transitory computer-readable medium comprising instructions that upon execution in a video decoding device cause the device to decode refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, wherein the instructions cause the device to:

• identify a signal indicating that a first subset of refinement coefficients, defined as refinement coefficients with a high probability of being zero, are not coded into a received encoded bitstream;
• decode a second subset of refinement coefficients from the encoded bitstream, wherein the second subset of refinement coefficients are those that do not qualify as belonging to the first subset and wherein the second subset of refinement coefficients are those that do not define a high probability of being zero based on history of corresponding transform coefficient values associated with one or more previous layers of the SVC scheme;
• and
• generate information that estimates a particular refinement coefficient of the first subset of refinement coefficients based on assigned index values dependent upon the particular refinement coefficient values associated with the one or more previous layers of the SVC scheme, wherein the assigned index values are assigned for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig=(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable.

A method of decoding refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, the method comprising:

• evaluating a history of transform coefficient values associated with one or more previous layers of the SVC scheme by assigning index values for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig=(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable;
• defining a first subset of the refinement coefficients of the enhancement layer as type-0 refinement coefficients, based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are those that define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• defining a second subset of the refinement coefficients of the enhancement layer as type-1 refinement coefficients based on the assigned index values dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-1 refinement coefficients are those that do not qualify as type-0 coefficients and wherein the type-1 refinement coefficients are those that do not define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• decoding information for the type-1 refinement coefficients from an encoded bitstream;
• and
• generating information that estimates one or more of the type-0 refinement coefficient values associated with the enhancement layer based on the assigned index values dependent upon corresponding transform coefficient values associated with one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are not coded into the encoded bitstream, wherein generating the information comprises assigning values of zero to refinement coefficients of the enhancement layer that have index values that correspond to one or more pre-defined index values.

A method of encoding refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, the method comprising:

• evaluating a history of transform coefficient values associated with one or more previous layers of the SVC scheme;
• assigning index values for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig=(ci=0)?1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable,
• defining a first subset of the refinement coefficients of the enhancement layer as type-0 refinement coefficients based on the assigned index values dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are those that define a high probability of being zero based on the assigned index values dependent upon history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• defining a second subset of the refinement coefficients of the enhancement layer as type-1 refinement coefficients based on the assigned index values dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-1 refinement coefficients are those that do not qualify as type-0 coefficients and wherein the type-1 refinement coefficients are those that do not define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• coding the type-1 refinement coefficients into an encoded bitstream, wherein the type-0 refinement coefficients are not coded into the encoded bitstream.

A device that decodes refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, the device comprising one or more processors and a memory configured to define:

• a history module that evaluates a history of transform coefficient values associated with one or more previous layers of the SVC scheme by assigning index values for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig=(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable,
• wherein the history module defines a first subset of the refinement coefficients of the enhancement layer as type-0 refinement coefficients, based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, and defines a second subset of the refinement coefficients of the enhancement layer as type-1 refinement coefficients, based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are those that define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-1 refinement coefficients are those that do not qualify as type-0 coefficients, and wherein the type-1 refinement coefficients are those that do not define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• and
• a decoding module that decodes information for the type-1 refinement coefficients from an encoded bitstream, and generates information that estimates one or more of the type-0 refinement coefficient values associated with the enhancement layer based on the assigned index values dependent upon corresponding transform coefficient values associated with one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are not coded into the encoded bitstream, wherein the decoding module generates the information by assigning values of zero to refinement coefficients of the enhancement layer that have index values that correspond to one or more pre-defined index values.

A device that encodes refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, the device comprising one or more processors and a memory configured to define:

• a history module that evaluates a history of transform coefficient values associated with one or more previous layers of the SVC scheme by assigning index values for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig≦(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable;
• and
• wherein the history module defines a first subset of the refinement coefficients of the enhancement layer as type-0 refinement coefficients based on the assigned index values dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, and defines a second subset of the refinement coefficients of the enhancement layer as type-1 refinement coefficients based on the assigned index values dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are those that define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-1 refinement coefficients are those that do not qualify as type-0 coefficients, and wherein the type-1 refinement coefficients are those that do not define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• and
• encoding module that encodes the type-1 refinement coefficients in an encoded bitstream, wherein the type-0 refinement coefficients are not coded into the encoded bitstream.

A non-transitory computer-readable medium comprising instructions that upon execution in a video decoding device cause the device to decode refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, wherein the instructions cause the device to:

• evaluate a history of transform coefficient values associated with one or more previous layers of the SVC scheme by assigning index values for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig=(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable;
• define a first subset of the refinement coefficients of the enhancement layer as type-0 refinement coefficients based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are those that define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• define a second subset of the refinement coefficients of the enhancement layer as type-1 refinement coefficients based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-1 refinement coefficients are those that do not qualify as type-0 coefficients and wherein the type-1 refinement coefficients are those that do not define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• decode information for the type-1 refinement coefficients from an encoded bitstream;
• and
• generate information that estimates one or more of the type-0 refinement coefficient values associated with the enhancement layer based on the assigned index values dependent upon corresponding transform coefficient values associated with one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are not coded into the encoded bitstream, wherein generating the information comprises assigning values of zero to refinement coefficients of the enhancement layer that have index values that correspond to one or more pre-defined index values.

A device that decodes refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, the device comprising:

• means for evaluating a history of transform coefficient values associated with one or more previous layers of the SVC scheme, wherein the means for evaluating assigns index values for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (i=0;
• i<n;
• i++){
• sig=(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable;
• wherein the means for evaluating defines a first subset of the refinement coefficients of the enhancement layer as type-0 refinement coefficients, based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, and defines a second subset of the refinement coefficients of the enhancement layer as type-1 refinement coefficients, based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are those that define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-1 refinement coefficients are those that do not qualify as type-0 coefficients, and wherein the type-1 refinement coefficients are those that do not define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• and
• means for decoding that decodes information for the type-1 refinement coefficients from an encoded bitstream, and generates information that estimates one or more of the type-0 refinement coefficient values associated with the enhancement layer based on the assigned index values dependent upon corresponding transform coefficient values associated with one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are not coded into the encoded bitstream, wherein generating the information comprises assigning values of zero to refinement coefficients of the enhancement layer that have index values that correspond to one or more pre-defined index values.

A circuit configured to decode refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme, wherein the circuit is configured to:

• evaluate a history of transform coefficient values associated with one or more previous layers of the SVC scheme by assigning index values for refinement coefficients of the enhancement layer, the index values being dependent upon corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein a given index value (h) is calculated as follows:
• h=0
• for (1=0;
• i<n;
• i++){
• sig=(ci=0)? 1:
• 0;
• h=h+sig*(2<<i);
• }
• where i is a layer number, ci is a value of a collocated coefficient at layer i, i++ refers to i=i+1, and sig is an intermediate variable;
• define a first subset of the refinement coefficients of the enhancement layer as type-0 refinement coefficients based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are those that define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• define a second subset of the refinement coefficients of the enhancement layer as type-1 refinement coefficients based on the assigned index values dependent upon the transform coefficient values associated with the one or more previous layers of the SVC scheme, wherein the type-1 refinement coefficients are those that do not qualify as type-0 coefficients and wherein the type-1 refinement coefficients are those that do not define a high probability of being zero based on the history of corresponding transform coefficient values associated with the one or more previous layers of the SVC scheme;
• decode information for the type-1 refinement coefficients from an encoded bitstream;
• and
• generate information that estimates one or more of the type-0 refinement coefficient values associated with the enhancement layer based on the assigned index values dependent upon corresponding transform coefficient values associated with one or more previous layers of the SVC scheme, wherein the type-0 refinement coefficients are not coded into the encoded bitstream, wherein generating the information comprises assigning values of zero to refinement coefficients of the enhancement layer that have index values that correspond to one or more pre-defined index values.