Apparatuses and methods for providing quantized coefficients for video encoding
View Patent ↗Apparatuses and methods for optimizing rate-distortion costs in a signal are disclosed herein. An apparatus may comprise a quantization block that may be configured to serially receive a plurality of coefficients and to generate a plurality of candidates for each of a plurality of coefficients. The quantization block may further be configured to generate a respective arc for each of the candidates having a respective rate and in accordance with the MPEG-2 coding standard. The quantization block may further be configured to identify which of the plurality of arcs has a minimum cost and provide a modified plurality of coefficients associated with the minimum cost arc.
1. An apparatus, comprising:
a candidate generation block configured to generate a plurality of candidates based, at least in part, on a received coefficient;
a plurality of node cost blocks coupled to the candidate generation block, each of the plurality of node cost blocks configured to receive the plurality of candidates from the candidate generation block and a NodeID control signal that defines a respective node state of the MPEG 2 encoding standard, each of the plurality of node cost blocks configured to generate, for each candidate of the plurality of candidates, an arc based, at least in part, on the respective node state defined by the received NodeID control signal and a distortion cost of the candidate; and
a plurality of minimum cost blocks coupled to the plurality of node cost blocks, each of the plurality of minimum cost blocks having a respective node state of the MPEG 2 encoding standard,
wherein for each minimum cost block, the minimum cost block is configured to:
receive, from the plurality of node cost blocks, one or more arcs based on the node state of the minimum cost block, wherein all of the one or more arcs provided to the minimum cost block have a particular node state of the MPEG 2 encoding standard, and
identify which arc of the one or more arcs has a lowest cost.
2. The apparatus of claim 1 , wherein the optimization block is included in an encoder.
3. The apparatus of claim 1 , wherein the plurality of node cost blocks and the plurality of minimum cost blocks are configured in a trellis arrangement.
4. The apparatus of claim 1 , wherein the optimization block further comprises a rate block configured to calculate the rate cost using a rate estimation table.
5. The apparatus of claim 4 , wherein the candidate generation block configured to inverse quantize each of the candidates in accordance with the MPEG-2 coding standard.
6. The apparatus of claim 4 , wherein the candidate generation block is configured to generate each candidate based, at least in part, on an inversed rate scaling factor.
7. The apparatus of claim 1 , wherein each node cost block provides an arc of the plurality of arcs to a respective minimum cost block of the plurality of minimum cost blocks, based on one or more state transition schemes, according to the MPEG 2 encoding standard.
8. The apparatus of claim 1 , wherein each of the plurality of node cost blocks is coupled to a minimum cost block of the plurality of minimum cost blocks having a same respective node state of the MPEG-2 encoding standard and to a minimum cost block of the plurality of minimum cost blocks having a zero node state.