... Finding Stars . ... Handling Bad Pixels . ... The guide camera image controller can control one or more guide cameras. ... Each time the camera is read, the image is automatically saved to a fits file on a shared disk. ... Cameras that have bad pixels require "bad pixel maps" in order to find stars, centroid or even compute statistics for the image. ... View this image (for instance in NIH Image) and determine an upper and lower cutoff; pixels whose values are outside of this range are considered...