Apparatus and method for encoding or decoding using a subband dependent prediction adaptation for GCLI entropy coding

An apparatus for decoding an encoded image signal comprising data on encoded greatest coded line indices and data on coefficients, comprising:

• a decoding mode determiner for determining different decoding modes for the data on the encoded greatest coded line indices for different subbands within a precinct, wherein the data on the coefficients represent image data being decomposed into a plurality of different subbands, each subband comprising a plurality of coefficients, wherein the precinct comprises different sets of coefficients from different subbands, wherein two sets of coefficients of a precinct belong to a spatial region of an image represented by the image data;
• and
• a decoder for decoding the data on the encoded greatest coded line indices for the first set in the precinct using the first decoding mode and for decoding the data on the encoded greatest coded line indices for the second set in the precinct using a second decoding mode as determined by the decoding mode determiner, and for decoding the data on the coefficients using decoded greatest coded line index data,
• wherein the first decoding mode and the second decoding mode are selected from a group of decoding modes comprising at least two of a vertical inverse prediction decoding mode, a horizontal inverse prediction decoding mode, and a raw decoding mode.

A method for encoding image data, the image data being decomposed into a plurality of different subbands, each subband comprising a plurality of coefficients, wherein a first subband of the plurality of different subbands comprises a first set of coefficients, wherein a different second subband of the plurality of different subbands comprises a different second set of coefficients, wherein a precinct comprises the first and the second sets of coefficients from the first and the second subbands of the plurality of different subbands, wherein the first and the second sets of coefficients of the precinct belong to a spatial region of an image represented by the image data, the method comprising:

• determining, for each group of coefficients within a set, a greatest coded line index (GCLI);
• encoding the greatest coded line indices associated with the first set of coefficients of the precinct in accordance with a first encoding mode, and encoding the greatest coded line indices associated with the second set of coefficients of the precinct in accordance with a second encoding mode, the second encoding mode being different from the first encoding mode;
• and
• outputting or storing an encoded image signal comprising data on the encoded greatest coded line indices and data on the coefficients,
• wherein the first encoding mode and the second encoding mode are selected from a set of encoding modes comprising at least two of:
• a vertical prediction encoding mode, a horizontal prediction encoding mode, and a raw encoding mode.

A method for decoding an encoded image signal comprising data on encoded greatest coded line indices and data on coefficients, comprising:

• determining different decoding modes for the data on the encoded greatest coded line indices for different subbands within a precinct, wherein the data on the coefficients represent image data being decomposed into a plurality of different subbands, each subband comprising a plurality of coefficients, wherein the precinct comprises different sets of coefficients from different subbands, wherein two sets of coefficients of a precinct belong to a spatial region of an image represented by the image data;
• and
• decoding the data on the encoded greatest coded line indices for the first set in the precinct using the first decoding mode and decoding the data on the encoded greatest coded line indices for the second set in the precinct using a second decoding mode as determined by the determining the different decoding modes, and decoding the data on the coefficients using decoded greatest coded line index data,
• wherein the first decoding mode and the second decoding mode are selected from a group of decoding modes comprising at least two of a vertical inverse prediction decoding mode, a horizontal inverse prediction decoding mode, and a raw decoding mode.

A non-transitory digital storage medium having stored thereon a computer program for performing a method for encoding image data, the image data being decomposed into a plurality of different subbands, each subband comprising a plurality of coefficients, wherein a first subband of the plurality of different subbands comprises a first set of coefficients, wherein a different second subband of the plurality of different subbands comprises a different second set of coefficients, wherein a precinct comprises the first and the second sets of coefficients from the first and the second subbands of the plurality of different subbands, wherein the first and the second sets of coefficients of the precinct belong to a spatial region of an image represented by the image data, the method comprising:

• determining, for each group of coefficients within a set, a greatest coded line index (GCLI);
• encoding the greatest coded line indices associated with the first set of coefficients of the precinct in accordance with a first encoding mode, and encoding the greatest coded line indices associated with the second set of coefficients of the precinct in accordance with a second encoding mode, the second encoding mode being different from the first encoding mode;
• and
• outputting or storing an encoded image signal comprising data on the encoded greatest coded line indices and data on the coefficients,
• wherein the first encoding mode and the second encoding mode are selected from a set of encoding modes comprising at least two of:
• a vertical prediction encoding mode, a horizontal prediction encoding mode, and a raw encoding mode,
• when said computer program is run by a computer.

A non-transitory digital storage medium having stored thereon a computer program for performing a method for decoding an encoded image signal comprising data on encoded greatest coded line indices and data on coefficients, comprising:

• determining different decoding modes for the data on the encoded greatest coded line indices for different subbands within a precinct, wherein the data on the coefficients represent image data being decomposed into a plurality of different subbands, each subband comprising a plurality of coefficients, wherein the precinct comprises different sets of coefficients from different subbands, wherein two sets of coefficients of a precinct belong to a spatial region of an image represented by the image data;
• and
• decoding the data on the encoded greatest coded line indices for the first set in the precinct using the first decoding mode and decoding the data on the encoded greatest coded line indices for the second set in the precinct using a second decoding mode as determined by the determining the different decoding modes, and decoding the data on the coefficients using decoded greatest coded line index data,
• wherein the first decoding mode and the second decoding mode are selected from a group of decoding modes comprising at least two of a vertical inverse prediction decoding mode, a horizontal inverse prediction decoding mode, and a raw decoding mode,
• when said computer program is run by a computer.