US 2012/0057629 A1 · Rho-domain Metrics

Abstract

Video encoders, systems and methods are described that characterize video encoding processes using a ρ-domain deviation metric. The deviation metric represents a weighted difference between actual non-zero coefficients and the expected non-zero coefficients, the actual and expected coefficients corresponding to quantization of a macroblock in a video frame during video encoding of the frame. The deviation metric is used to adjust the video encoding process to obtain an optimized encoding bit rate for a desired video encoding quality by selecting a quantizing parameter based on a normalized value of the deviation metric. The quantizing parameter can be selected from a table indexed using the deviation metric.

Claims19

Dependent claims

A method of video encoding performed by a video encoder comprising:

providing in non-transitory storage information relating a plurality of expected non-zero coefficients obtained from quantization of a macroblock to one or more quantization parameters used in a video encoding process;
generating information relating a plurality of actual non-zero coefficients obtained during video encoding of the macroblock to the one or more quantization parameters;
calculating a deviation metric comprising a ratio of the actual non-zero coefficients and the expected non-zero coefficients for one or more quantization step size;
and
adjusting the video encoding process using the deviation metric to obtain an encoding bit rate for a desired video encoding quality.

2 more elements

Dependencies are inferred from the claim text.

Rho-domain Metrics

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Rho-domain Metrics

Life of this patent

Abstract

Claims19