Method and system for entropy coding/decoding of a video bit stream for fine granularity scalability

A method of encoding video data into a bit stream, said method comprising:

• calculating transform coefficients for base layer blocks of video data;
• calculating transform coefficients for multiple enhancement layer blocks of video data;
• selecting coefficients to be encoded from each of the multiple enhancement layer blocks;
• encoding the selected enhancement layer coefficients into a bit stream, one block at a time;
• iterating said selecting and encoding operations until all non-zero coefficient values have been encoded.

A computer code product for encoding video data, the computer code product comprising:

• computer code containing machine readable program code for causing, when executed, one or more machines to perform the following:
• calculating DCT coefficients for base layer blocks of video data;
• calculating DCT coefficients for enhancement layer blocks of video data;
• arranging the DCT coefficients from multiple enhancement layer blocks into subbands;
• determining whether the base layer blocks include zero coefficients;
• and
• encoding a coded block flag and end of block flag for an enhancement layer block of video data, corresponding to a base layer block, only if it is determined that the base layer block contains zero coefficients.

A computer code product for encoding video data into a bit stream, said computer code product comprising:

• computer code containing machine readable program code for causing, when executed, one or more machines to perform the following:
• calculating transform coefficients for base layer blocks of video data;
• calculating transform coefficients for multiple enhancement layer blocks of video data;
• selecting coefficients to be encoded from each of the multiple enhancement layer blocks;
• encoding the selected enhancement layer coefficients into a bit stream, one block at a time;
• iterating said selecting and encoding operations until all non-zero coefficient values have been encoded.

A computer code product for encoding video data into a bit stream, said method comprising:

• computer code containing machine readable program code forcasuing, when executed, one or more machines to perform the following:
• calculating transform coefficients for a base layer of video data;
• calculating transform coefficients for an enhancement layer of video data;
• encoding the transform coefficients for said enhancement layer into a bit stream using a context-based arithmetic coder.

A device for encoding for encoding video data, the device comprising:

• a processor;
• memory;
• and
• an application for causing, when executed, one or more machines to perform the following:
• calculating DCT coefficients for base layer macro blocks of video data;
• calculating DCT coefficients for enhancement layer macro blocks of video data;
• arranging the DCT coefficients from multiple enhancement layer macro blocks into subbands;
• determining whether the base layer macro blocks include zero coefficients;
• and
• encoding a coded block flag and end of block flag for an enhancement layer macro block of video data, corresponding to a base layer macro block, only if it is determined that the base layer macro block contains zero coefficients.

A device for encoding video data into a bit stream, said device comprising:

• a processor;
• a memory;
• and
• an application for causing, when executed, one or more machines to perform the following:
• calculating transform coefficients for base layer blocks of video data;
• calculating transform coefficients for multiple enhancement layer blocks of video data;
• selecting coefficients to be encoded from each of the multiple enhancement layer blocks;
• encoding the selected enhancement layer coefficients into a bit stream, one block at a time;
• iterating said selecting and encoding operations until all non-zero coefficient values have been encoded.

A device for encoding video data into a bit stream, said method comprising:

• a processor;
• a memory;
• and
• an application for causing, when executed, one or more machines to perform the following:
• calculating transform coefficients for a base layer of video data;
• calculating transform coefficients for an enhancement layer of video data;
• encoding the transform coefficients for said enhancement layer into a bit stream using a context-based arithmetic coder.

A method of decoding video data, the method comprising:

• decoding transform coefficients for base layer block of video data;
• decoding a coded region flag if a region of base layer coefficients contains only zero-valued coefficients;
• decoding subband coefficients when their availability is indicated by the coded region flag or when a region of base layer coefficients contains at least one non-zero-valued coefficient;
• and
• arranging the subband coefficients into multiple enhancement layer blocks.

A method of decoding video data comprising base layer blocks and enhancement layer blocks, said method comprising:

• decoding transform coefficients for the base layer blocks of video data;
• decoding one or more enhancement coefficients for each enhancement layer block;
• assigning said decoded coefficients to coefficient positions within said enhancement layer blocks;
• iterating said decoding and assigning operations until all coefficient values for said enhancement layer blocks have been decoded.