colour_hdri.camera_response_functions_Debevec1997#

colour_hdri.camera_response_functions_Debevec1997(image_stack: ImageStack, sampling_function: Callable = samples_Grossberg2003, sampling_function_kwargs: Dict | None = None, weighting_function: Callable = weighting_function_Debevec1997, weighting_function_kwargs: Dict | None = None, extrapolating_function: Callable = extrapolating_function_polynomial, extrapolating_function_kwargs: Dict | None = None, l_s: float = 30, n: int = 256, normalise: bool = True) → NDArrayFloat[source]#

Return the camera response functions for given image stack using Debevec (1997) method.

Image channels are sampled with \(s\) sampling function and the output samples are passed to colour_hdri.g_solve().

Parameters:

  • image_stack (ImageStack) – Stack of single channel or multi-channel floating point images.

  • sampling_function (Callable) – Sampling function \(s\).

  • sampling_function_kwargs (Dict | None) – Arguments to use when calling the sampling function.

  • weighting_function (Callable) – Weighting function \(w\).

  • weighting_function_kwargs (Dict | None) – Arguments to use when calling the weighting function.

  • extrapolating_function (Callable) – Extrapolating function used to handle zero-weighted data.

  • extrapolating_function_kwargs (Dict | None) – Arguments to use when calling the extrapolating function.

  • l_s (float) – \(\lambda\) smoothing term.

  • n (int) – \(n\) constant.

  • normalise (bool) – Enables the camera response functions normalisation.

Returns:

Camera response functions \(g(z)\).

Return type:

numpy.ndarray

References

[DM97]