autowisp.image_calibration.mask_utilities module

Class Inheritance Diagram

A collection of functions for working with masks.

autowisp.image_calibration.mask_utilities.mask_flags

Dictionary contaning the possible bad pixel flags and the corresponding bitmasks.

autowisp.image_calibration.mask_utilities.combine_masks(mask_filenames)

Create a combined mask image from the masks of all input files.

Parameters:

mask_filenames – A list of FITS filenames from which to read mask images (identified by the IMAGETYP header keyword matching [a-z_]*mask). Or a single filename.

Returns:

A bitwise or of the mask extensions of all input FITS files.

Return type:

numpy.array(dtype=uint8)

autowisp.image_calibration.mask_utilities.get_saturation_mask(raw_image, saturation_threshold, leak_directions)

Create a mask indicating saturated and leaked into pixels.

Parameters:

• raw_image – The image for which to generate the saturation mask.

• saturation_threshold – The pixel value which is considered saturated. Generally speaking this should be where the response of the pixel starts to deviate from linear.

• leak_directions – Directions in which charge overflows out of satuarted pixels. Should be a list of 2-tuples giving the x and y offset to which charge is leaked.

Returns:

A bitmask array flagging pixels which are above saturation_threshold or which are adjacent from a saturated pixel in a direction in which a charge could leak.

Return type:

numpy.array(dtype=uint8)