It takes an UFTI observation comprising nine object frames and a dark frame to make a calibrated, untrimmed mosaic automatically. This recipe aims to keep pace with the pipeline's incoming data, and is intended for faint sources and for moderately crowded fields. The flat field is created by combining normalised object frames using the clipped median at each pixel.
Registration is performed using the telescope offsets transformed to pixels.
There is no resampling, merely integer shifts of origin. The recipe makes the mosaics by applying offsets in intensity to give the most consistent result amongst the overlapping regions. The mosaic is not trimmed to the dimensions of a single frame, thus the noise will be greater in the peripheral areas having received less exposure time. For each cycle of nine, the recipe creates a mosaic, which is then added into a master mosaic of improving signal to noise. The number of frames in the jitter pattern.