The standard calibration algorithm executes the following steps for each raw data image (if requested, see the dialog window in figure 1):
Important:
It depends on the algorithm used for the reconstruction step if it is allowed to subtract the sky background or not. For example, the Richardson-Lucy deconvolution algorithm uses a sky-subtracted psf but a target image which must contain the sky background. In this case, the sky background must be kept and subtracted later during the psf preprocessing step.![]() |
The defect pixel interpolation is provided by an algorithm which uses up to two pairs of good pixels. The pixels of a pair are on the opposite side of a defect pixel, and an interpolation schema is used to calculate the replacement value.
Additional information: