Barbell lifting for multi-layer wavelet coding

A computing device comprising:

• a processor;
• and
• a memory coupled to the processor, the memory comprising computer-program instructions executable by the processor for:
• scalably generating a plurality of layers of wavelet coefficients based on a plurality of frames of video data;
• scalably generating motion vector data associated with the plurality of layers;
• combining the motion vector data and the plurality of layers of wavelet coefficients into a plurality of coded video frames representing the plurality of frames of video data;
• and
• selecting a motion vector coding mode with which to scalably generate the motion vector data;
• wherein the selecting operation comprises selecting one of:
• a half magnitude mode;
• a forward transmit/backward generate mode;
• a backward transmit/forward generate mode;
• and
• an inverse direction mode;
• wherein scalably generating motion vector data comprises:
• generating a plurality of motion vectors encoded at a plurality of motion levels of resolution, including a base level and at least one enhancement level;
• determining a switching bit rate, wherein at a bit rate below the switching bit rate a base motion vector at the base level of resolution is transmitted and at a bit rate above the switching bit rate a fine motion vector at an enhancement level of resolution is transmitted, and wherein the determining comprises applying a function of the form:
• arg
• ⁢
• ⁢
• min
• i
• ⁢
• {
• D
• t
• ⁡
• (
• R
• -
• R
• Mi
• )
• +
• D
• Mismatch
• ⁡
• (
• M
• ,
• M
• i
• )
• }
• ⁢
• ,
• (
• 1
• ≤
• i
• ≤
• n
• )
• wherein M represents a given motion vector, Mi represents a motion vector encoded at an ith motion level, i represents one of n motion levels, R represent a bit rate associated with M, RMi represents a bit rate associated with Mi, Dt denotes a rate-distortion function, DMismatch represents distortion caused by motion mismatch between M and Mi.

A computing device comprising:

• a processor;
• and
• a memory coupled to the processor, the memory comprising computer-program instructions executable by the processor for:
• scalably generating a plurality of layers of wavelet coefficients based on a plurality of frames of video data;
• scalably generating motion vector data associated with the plurality of layers;
• combining the motion vector data and the plurality of layers of wavelet coefficients into a plurality of coded video frames representing the plurality of frames of video data
• selecting a motion vector coding mode with which to scalably generate the motion vector data;
• wherein the selecting operation comprises selecting one of:
• a half magnitude mode;
• a forward transmit/backward generate mode;
• a backward transmit/forward generate mode;
• and
• an inverse direction mode;
• wherein scalably generating motion vector data comprises:
• generating a plurality of motion vectors encoded at a plurality of motion levels of resolution, including a base level and at least one enhancement level;
• determining a switching bit rate, wherein at a bit rate below the switching bit rate a base motion vector at the base level of resolution is transmitted and at a bit rate above the switching bit rate a fine motion vector at an enhancement level of resolution is transmitted, and
• wherein scalably generating motion vector data further comprises estimating a distortion between a given motion vector at an associated bit rate and a motion vector encoded at an ith enhancement level by applying a function of the form:
• Di(R)=Dt(R−RMi)+DMismatch(M, Mi),(1≦i≦n),
• wherein M represents the given motion vector, Mi represents a motion vector encoded at an ith motion level, i represents one of n motion levels, R represent a bit rate associated with M, RMi represents a bit rate associated with Mi, Dt denotes a rate-distortion function, DMismatch represents distortion caused by motion mismatch between M and Mi.

A computer-readable medium having computer-executable instructions encoded thereon for executing a computer process on a computer, the computer process comprising:

• scalably generating a plurality of layers of wavelet coefficients based on a plurality of frames of video data;
• scalably generating motion vector data associated with the plurality of layers;
• combining the motion vector data and the plurality of layers of wavelet coefficients into a plurality of coded video frames representing the plurality of frames of video data
• selecting a motion vector coding mode with which to scalably generate the motion vector data
• wherein the selecting operation comprises selecting one of:
• a half magnitude mode;
• a forward transmit/backward generate mode;
• a backward transmit/forward generate mode;
• and
• an inverse direction mode;
• wherein scalably generating motion vector data comprises:
• generating a plurality of motion vectors encoded at a plurality of motion levels of resolution, including a base level and at least one enhancement level;
• determining a switching bit rate, wherein at a bit rate below the switching bit rate a base motion vector at the base level of resolution is transmitted and at a bit rate above the switching bit rate a fine motion vector at an enhancement level of resolution is transmitted, and
• wherein scalably generating motion vector data further comprises estimating a distortion between a given motion vector at an associated bit rate and a motion vector encoded at an ith enhancement level by applying a function of the form:
• Di(R)=Dt(R−RMi)+DMismatch(M, Mi),(1≦i≦n),
• wherein M represents the given motion vector, Mi represents a motion vector encoded at an ith motion level, i represents one of n motion levels, R represent a bit rate associated with M, R Mi represents a bit rate associated with Mi, Dt denotes a rate-distortion function, DMismatch represents distortion caused by motion mismatch between M and Mi.