Video decoder, video encoder, method for decoding a video content, method for encoding a video content, computer program and video bitstream

A video encoder, comprising an arithmetic encoder,

• wherein the video encoder is configured to encode a plurality of video frames,
• wherein the video encoder is configured to encode a video frame which is subdivided into a set of one or more slices,
• wherein the video encoder is configured to provide slice type information indicating whether a slice is encoded using an independent coding mode, in which there is no prediction of a video content of a current frame on a basis of a video content of a previous frame, or using a single-predictive mode in which there is a prediction of a block of pixels on a basis of one block of pixels of the previous frame, or using a bi-predictive mode in which there is a prediction of the block of pixels on a basis of two or more blocks of pixels of one or more previous frames,
• wherein the arithmetic encoder is configured for providing an encoded representation of a binary sequence on a basis of the binary sequence,
• wherein the arithmetic encoder is configured to determine a first source statistic value using a first estimation parameter and to determine a second source statistic value using a second estimation parameter,
• wherein the arithmetic encoder is configured to determine a combined source statistic value on a basis of the first source statistic value and on a basis of the second source statistic value,
• wherein the arithmetic encoder is configured to determine one or more range values for an interval subdivision, which is used for a mapping of the binary sequence onto the encoded representation of the binary sequence, on a basis of the combined source statistic value,
• wherein the video encoder is configured to acquire an updated version at+1 of the first source statistic value according to
• at+1=at+xt·(ONEa>>na)−(at>>na),
• wherein at is a previously computed version of the first source statistic value,
• wherein xt is a previously encoded binary value,
• wherein na is a window size information,
• wherein
• ONEa=(1<<BITSa)−ka,
• wherein BITSa is a number of bits used to represent the first source statistic value,
• wherein ka is a predetermined number;
• and/or
• wherein the video encoder is configured to acquire an updated version bt+1 of the second source statistic value according to
• bt+1=bt+xt·(ONEb>>nb)−(bt>>nb),
• wherein bt is a previously computed version of the second source statistic value,
• wherein xt is a previously encoded symbol,
• wherein nb is a window size information,
• wherein
• ONEb=(1<<BITSb)−kb,
• wherein BITSb is a number of bits used to represent the second source statistic value,
• wherein kb is a predetermined number, and
• wherein ka=1 and/or kb=1.

A method for decoding a video content, the method comprising decoding a plurality of video frames,

• wherein the method comprises decoding a video frame which is subdivided into a set of one or more slices,
• wherein the method comprises evaluating slice type information indicating whether a slice is encoded using an independent coding mode, in which there is no prediction of a video content of a current frame on a basis of a video content of a previous frame, or using a single-predictive mode in which there is a prediction of a block of pixels on a basis of one block of pixels of the previous frame, or using a bi-predictive mode in which there is a prediction of the block of pixels on a basis of two blocks of pixels of one or more previous frames, to select a mode of operation for a decoding of the slice,
• wherein the method comprises providing a decoded binary sequence on a basis of an encoded representation of the binary sequence,
• wherein the method comprises determining a first source statistic value using a first estimation parameter and determining a second source statistic value using a second estimation parameter, and
• wherein the method comprises determining a combined source statistic value on a basis of the first source statistic value and on a basis of the second source statistic value,
• wherein the method comprises determining one or more range values for an interval subdivision, which is used for a mapping of the encoded representation of the binary sequence onto the decoded binary sequence, on a basis of the combined source statistic value,
• wherein the method comprises acquiring an updated version at+1 of the first source statistic value according to
• at+1=at+xt·(ONEa>>na)−(at>>na),
• wherein at is a previously computed version of the first source statistic value,
• wherein xt is a previously decoded binary value,
• wherein na is a window size information,
• wherein
• ONEa=(1<<BITSa)−ka,
• wherein BITSa is a number of bits used to represent the first source statistic value,
• wherein ka is a predetermined number;
• and/or
• wherein the method comprises acquiring an updated version bt+1 of the second source statistic value according to
• bt+1=bt+xt·(ONEb>>nb)−(bt>>nb),
• wherein bt is a previously computed version of the second source statistic value,
• wherein xt is a previously decoded symbol,
• wherein nb is a window size information,
• wherein
• ONEb=(1<<BITSb)−kb,
• wherein BITSb is a number of bits used to represent the second source statistic value,
• wherein kb is a predetermined number, and
• wherein ka=1 and/or kb=1.

A method for encoding a video content, the method comprising encoding a plurality of video frames,

• wherein the method comprises encoding a video frame which is subdivided into a set of one or more slices,
• wherein the method comprises providing slice type information indicating whether a slice is encoded using an independent coding mode, in which there is no prediction of a video content of a current frame on a basis of a video content of a previous frame, or using a single-predictive mode in which there is a prediction of a block of pixels on a basis of one block of pixels of the previous frame, or using a bi-predictive mode in which there is a prediction of the block of pixels on a basis of two blocks of pixels of one or more previous frames,
• wherein the method comprises providing an encoded representation of a binary sequence on a basis of the binary sequence,
• wherein the method comprises determining a first source statistic value using a first estimation parameter and determining a second source statistic value using a second estimation parameter,
• wherein the method comprises determining a combined source statistic value on a basis of the first source statistic value and on the basis of the second source statistic value,
• wherein the method comprises determining one or more range values for an interval subdivision, which is used for a mapping of the binary sequence onto the encoded representation of the binary sequence, on a basis of the combined source statistic value,
• wherein the method comprises acquiring an updated version at+1 of the first source statistic value according to
• at+1=at+xt·(ONEa>>na)−(at>>na),
• wherein at is a previously computed version of the first source statistic value,
• wherein xt is a previously encoded binary value,
• wherein na is a window size information,
• wherein
• ONEa=(1<<BITSa)−ka,
• wherein BITSa is a number of bits used to represent the first source statistic value,
• wherein ka is a predetermined number;
• and/or
• wherein the method comprises acquiring an updated version bt+1 of the second source statistic value according to
• bt+1=bt+xt·(ONEb>>nb)−(bt>>nb),
• wherein bt is a previously computed version of the second source statistic value,
• wherein xt is a previously encoded symbol,
• wherein nb is a window size information,
• wherein
• ONEb=(1<<BITSb)−kb,
• wherein BITSb is a number of bits used to represent the second source statistic value,
• wherein kb is a predetermined number, and
• wherein ka=1 and/or kb=1.

A non-transitory digital storage medium having a computer program stored thereon to perform, when the computer program is run by a computer, a method for decoding a video content, the method comprising decoding a plurality of video frames,

• wherein the method comprises decoding a video frame which is subdivided into a set of one or more slices,
• wherein the method comprises evaluating slice type information indicating whether a slice is encoded using an independent coding mode, in which there is no prediction of a video content of a current frame on a basis of a video content of a previous frame, or using a single-predictive mode in which there is a prediction of a block of pixels on a basis of one block of pixels of the previous frame, or using a bi-predictive mode in which there is a prediction of the block of pixels on a basis of two blocks of pixels of one or more previous frames, to select a mode of operation for a decoding of the slice;
• wherein the method comprises providing a decoded binary sequence on a basis of an encoded representation of the binary sequence,
• wherein the method comprises determining a first source statistic value using a first estimation parameter and determining a second source statistic value using a second estimation parameter,
• wherein the method comprises determining a combined source statistic value on a basis of the first source statistic value and on the basis of the second source statistic value,
• wherein the method comprises determining one or more range values for an interval subdivision, which is used for a mapping of the encoded representation of the binary sequence onto the decoded binary sequence, on a basis of the combined source statistic value,
• wherein the method comprises acquiring an updated version at+1 of the first source statistic value according to
• at+1=at+xt·(ONEa>>na)−(at>>na),
• wherein at is a previously computed version of the first source statistic value,
• wherein xt is a previously decoded binary value,
• wherein na is a window size information,
• wherein
• ONEa=(1<<BITSa)−ka,
• wherein BITSa is a number of bits used to represent the first source statistic value,
• wherein ka is a predetermined number;
• and/or
• wherein the method comprises acquiring an updated version bt+1 of the second source statistic value according to
• bt+1=bt+xt·(ONEb>>nb)−(bt>>nb),
• wherein bt is a previously computed version of the second source statistic value,
• wherein xt is a previously decoded symbol,
• wherein nb is a window size information,
• wherein
• ONEb=(1<<BITSb)−kb,
• wherein BITSb is a number of bits used to represent the second source statistic value,
• wherein kb is a predetermined number, and
• wherein ka=1 and/or kb=1.

A non-transitory digital storage medium having a computer program stored thereon to perform, when the computer program is run by a computer, a method for encoding a video content, the method comprising encoding a plurality of video frames,

• wherein the method comprises encoding a video frame which is subdivided into a set of one or more slices,
• wherein the video method comprises providing slice type information indicating whether a slice is encoded using an independent coding mode, in which there is no prediction of a video content of a current frame on a basis of a video content of a previous frame, or using a single-predictive mode in which there is a prediction of a block of pixels on a basis of one block of pixels of the previous frame, or using a bi-predictive mode in which there is a prediction of the block of pixels on a basis of two blocks of pixels of one or more previous frames,
• wherein the method comprises providing an encoded representation of a binary sequence on a basis of the binary sequence,
• wherein the method comprises determining a first source statistic value using a first estimation parameter and determining a second source statistic value using a second estimation parameter,
• wherein the method comprises determining a combined source statistic value on a basis of the first source statistic value and on the basis of the second source statistic value,
• wherein the method comprises determining one or more range values for an interval subdivision, which is used for a mapping of the binary sequence onto the encoded representation of the binary sequence, on a basis of the combined source statistic value,
• wherein the method comprises acquiring an updated version at+1 of the first source statistic value according to
• at+1=at+xt·(ONEa>>na)−(at>>na),
• wherein at is a previously computed version of the first source statistic value,
• wherein xt is a previously encoded binary value,
• wherein na is a window size information,
• wherein
• ONEa=(1<<BITSa)−ka,
• wherein BITSa is a number of bits used to represent the first source statistic value,
• wherein ka is a predetermined number;
• and/or
• wherein the method comprises acquiring an updated version bt+1 of the second source statistic value according to
• bt+1=bt+xt·(ONEb>>nb)−(bt>>nb),
• wherein bt is a previously computed version of the second source statistic value,
• wherein xt is a previously encoded symbol,
• wherein nb is a window size information,
• wherein
• ONEb=(1<<BITSb)−kb,
• wherein BITSb is a number of bits used to represent the second source statistic value,
• wherein kb is a predetermined number, and
• wherein ka=1 and/or kb=1.