LogPCHIP

class randd.model.LogPCHIP(r, d, d_measure, ndim)

1D PCHIP rate-distortion function interpolator.

Bitrate is converted into log scale according to the reference below. Extrapolation is enabled, but not always reliable.

Parameters

• r (NDArray) – Encoding representations.

• d (NDArray) – Corresponding distortions.

• d_measure (str) – Name of the distortion measure.

• ndim (int) – Number of dimensions of the RD function domain.

References

https://chromium.googlesource.com/webm/contributor-guide/+/master/scripts/visual_metrics.py

__call__(r)

Predict the distortion at the given representation.

Parameters

r (NDArray) – Input encoding representation.

Returns

Predicted distortion.

Return type

NDArray