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nabu.thirdparty.pcaflats_utils

source module nabu.thirdparty.pcaflats_utils

Functions

  • zinger_remove — Remove zingers. Anything which is >nsigma (default: 5) sigma after a 3x3 median filter is replaced by the filtered values.

  • dezinger — Performs parallelized zinger removal.

  • ccij — Compute the covariance (img[i]*img[j]).sum() / npixels It is a wrapper for threading. args == i, j, npixels, imgs

source zinger_remove(img: np.ndarray, dark: np.ndarray, medsize: int = 3, nsigma: float = 5)

Remove zingers. Anything which is >nsigma (default: 5) sigma after a 3x3 median filter is replaced by the filtered values.

source dezinger(flats, dark)

Performs parallelized zinger removal.

Parameters

  • in_imgs : tuple — Tuple in the form (flats, darks).

  • Written this way to have only one argument. Could be improved, but it works.

source ccij(args)

Compute the covariance (img[i]*img[j]).sum() / npixels It is a wrapper for threading. args == i, j, npixels, imgs