Separately coding the position of a last significant coefficient of a video block in video coding

A method of decoding coefficients associated with a block of video data during a video decoding process, the method comprising:

• decoding information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to decoding information that identifies positions of other non-zero coefficients within the block, wherein decoding the information that identifies the position of the last non-zero coefficient within the block according to the scanning order comprises decoding a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order,
• and wherein decoding the two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order comprises:
• decoding a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order including decoding a first sequence of one or more bins associated with the horizontal component using a context adaptive binary decoding process;
• decoding a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order including decoding a second sequence of bins one or more bins associated with the vertical component using the context adaptive binary decoding process;
• and
• for each coefficient associated with the block, determining whether the coefficient is the last non-zero coefficient within the block according to the scanning order, based on the horizontal coordinate and the vertical coordinate.

An apparatus for encoding coefficients associated with a block of video data during a video encoding process, the apparatus comprising:

• a memory configured to store the block of video data;
• and
• a video encoder configured to:
• encode information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to encoding information that identifies positions of other non-zero coefficients within the block, wherein to encode the information that identifies the position of the last non-zero coefficient within the block according to the scanning order, the video encoder is configured to encode a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, and wherein to encode the two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, the video encoder is configured to:
• determine a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarize the horizontal coordinate, such that the horizontal coordinate comprises a first sequence of one or more bins;
• determine a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarize the vertical coordinate, such that the vertical coordinate comprises a second sequence of one or more bins;
• and
• encode the first sequence of one or more bins and encoding the second sequence of one or more bins by performing a context adaptive binary encoding process.

An apparatus for decoding coefficients associated with a block of video data during a video decoding process, the apparatus comprising:

• a memory configured to store the block of video data;
• and
• a video decoder configured to:
• decode information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to decoding information that identifies positions of other non-zero coefficients within the block, wherein to decode the information that identifies the position of the last non-zero coefficient within the block according to the scanning order, the video decoder is configured to decode a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, and wherein to decode the two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, the video decoder is configured to:
• decode a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order including decoding a first sequence of one or more bins associated with the horizontal component using a context adaptive binary decoding process;
• decode a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order including decoding a second sequence of bins one or more bins associated with the vertical component using the context adaptive binary decoding process;
• and
• for each coefficient associated with the block, determine whether the coefficient is the last non-zero coefficient within the block according to the scanning order, based on the horizontal coordinate and the vertical coordinate.

A device for encoding coefficients associated with a block of video data during a video encoding process, the device comprising:

• means for encoding information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to coding information that identifies positions of other non-zero coefficients within the block;
• and
• means for encoding the information that identifies the positions of the other non-zero coefficients within the block,
• wherein the means for encoding the information that identifies the position of the last non-zero coefficient within the block according to the scanning order comprises means for encoding a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, and wherein the means for encoding the two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order comprises:
• means for determining a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarizing the horizontal coordinate, such that the horizontal coordinate comprises a first sequence of one or more bins;
• means for determining a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarizing the vertical coordinate, such that the vertical coordinate comprises a second sequence of one or more bins;
• and
• means for encoding the first sequence of one or more bins and encoding the second sequence of one or more bins by performing a context adaptive binary encoding process.

A device for decoding coefficients associated with a block of video data during a video decoding process, the device comprising:

• means for decoding information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to coding information that identifies positions of other non-zero coefficients within the block;
• and
• means for decoding the information that identifies the positions of the other non-zero coefficients within the block,
• wherein the means for decoding the information that identifies the position of the last non-zero coefficient within the block according to the scanning order comprises means for decoding a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, and wherein the means for decoding the two-dimensional position within the block comprises:
• means for decoding a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order including means for decoding a first sequence of one or more bins associated with the horizontal component using a context adaptive binary decoding process;
• means for decoding a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order including means for decoding a second sequence of bins one or more bins associated with the vertical component using the context adaptive binary decoding process;
• and
• means for, for each coefficient associated with the block, determining whether the coefficient is the last non-zero coefficient within the block according to the scanning order, based on the horizontal coordinate and the vertical coordinate.

A non-transitory computer-readable medium comprising instructions that, when executed, cause a processor to encode coefficients associated with a block of video data during a video encoding process, wherein the instructions cause the processor to:

• encode information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to coding information that identifies positions of other non-zero coefficients within the block, wherein the instructions that cause the processor to encode the information that identifies the position of the last non-zero coefficient within the block according to the scanning order comprise instructions that cause the processor to encode a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, and wherein to encode the two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order, the instructions cause the processor to:
• determine a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarize the horizontal coordinate, such that the horizontal coordinate comprises a first sequence of one or more bins;
• determine a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order and binarize the vertical coordinate, such that the vertical coordinate comprises a second sequence of one or more bins;
• and
• encode the first sequence of one or more bins and encode the second sequence of one or more bins by performing a context adaptive binary encoding process.

A non-transitory computer-readable medium comprising instructions that, when executed, cause a processor to decode coefficients associated with a block of video data during a video decoding process, wherein the instructions cause the processor to:

• decode information that identifies a position of a last non-zero coefficient within the block according to a scanning order associated with the block prior to coding information that identifies positions of other non-zero coefficients within the block, wherein the instructions that cause the processor to decode the information that identifies the position of the last non-zero coefficient within the block according to the scanning order comprise instructions that cause the processor to decode a two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order,
• and wherein the instructions that cause the processor to decode the two-dimensional position within the block that identifies the position of the last non-zero coefficient within the block according to the scanning order comprise instructions that cause the processor to:
• decode a horizontal coordinate of the position of the last non-zero coefficient within the block according to the scanning order including decoding a first sequence of one or more bins associated with the horizontal component using a context adaptive binary decoding process;
• decode a vertical coordinate of the position of the last non-zero coefficient within the block according to the scanning order including decoding a second sequence of bins one or more bins associated with the vertical component using the context adaptive binary decoding process;
• and
• for each coefficient associated with the block, determine whether the coefficient is the last non-zero coefficient within the block according to the scanning order, based on the horizontal coordinate and the vertical coordinate.