Faint Objects

Estimate and Subtract Local Sky

Find Faint Objects

The steps taken are: Once the objects have been found, the list of peaks in each object is culled, removing all peaks that are less significant than 3 sigma (sigma, the pixel standard deviation, is determined locally).

Bin Frame

Bin the frame by some power of two in both row and column direction. The origin of the binned frame in each band is chosen taking into account chip-to-chip offsets, so that the binned pixels in the different bands correspond to the same portion of the sky. The data is scaled up by the square root of the area of the binned pixel, so that no significant information is lost.

Binning is generally applied to data which has had an object finder run on it, and in which all detected objects have been replaced by the background level.

An object detected in a binned frame has the OBJECT1_BINNED flag set; it is not currently possible to know on what scale the field was binned.