Context adapaptive binary arithmetic coding initialization for gradual decoder refresh pictures

An apparatus, comprising:

• at least one processor;
• and
• at least one non-transitory memory storing instructions, that when executed by the at least one processor, cause the apparatus at least to:
• identify a gradual decoder refresh (GDR) picture within a gradual decoder refresh period of a sequence of pictures,
• wherein the gradual decoder refresh picture is a first picture within the gradual decoder refresh period of the sequence of pictures, and
• perform context-adaptive binary arithmetic coding initialization to determine at least one context-adaptive binary arithmetic coding state;
• and
• use the at least one context-adaptive binary arithmetic coding state for one of encoding or decoding the gradual decoder refresh picture.

A method, comprising:

• identifying a gradual decoder refresh picture within a gradual decoder refresh period of a sequence of pictures,
• wherein the gradual decoder refresh picture is a first picture within the gradual decoder refresh period of the sequence of pictures, and
• performing context-adaptive binary arithmetic coding initialization to determine at least one context-adaptive binary arithmetic coding state;
• and
• using the at least one context-adaptive binary arithmetic coding state for one of encoding or decoding the gradual decoder refresh picture.

A non-transitory computer readable medium comprising instructions which when executed by an apparatus, cause the apparatus to perform at least the following:

• identifying a gradual decoder refresh picture within a gradual decoder refresh period of a sequence of pictures,
• wherein the gradual decoder refresh picture is a first picture within the gradual decoder refresh period of the sequence of pictures, and
• performing context-adaptive binary arithmetic coding initialization to determine at least one context-adaptive binary arithmetic coding state;
• and
• using the at least one context-adaptive binary arithmetic coding state for one of encoding or decoding the gradual decoder refresh picture.