Detected pixels are manipulated using the following classes:
- Footprint : A set of pixels above (or below) a Threshold
- FootprintFunctor : A functor to process the pixels in a Footprint
- FootprintSet : A set of Footprints associated with a MaskedImage
- Peak : A peak pixel in the image
- Source : The properties of a source of electrons (e.g. a star or cosmic ray)
- Threshold : An object describing the threshold used to define a set of Footprints
