badpixel_masks

Bad pixel masks will be generated from FLAT_OFF and FLAT_ON images.

A master FLAT_OFF image is created by median combining all FLAT_OFF images. The readout pattern will be removed before combing.

Pixels with abnormal values in the master FLAT_OFF image will be marked as badpixel map.

Badpixels with high pixel values shows "+" pattern.

1. Mask pixels higher than 100 x sigma (the number should be customized).
2. Convolute that mask with "+" pattern.
3. Further mask pixels higher than 10 x sigma or lower than -10 x sigma.

We may further consider other types of bad pixels (see here).