Allows the user to input the name of an NDF image file and
then constructs an image count value versus occurence
histogram. This is used to allow count median, mode, kurtosis,
standard deviation, background count standard deviation and skewness
values to be estimated.
The user may also select which parts of the image are to be
used. The options implemented are:
- the whole image.
- areas defined using an ARD file.
Both options exclude bad valued points from the calculations.
Four estimates of the modal value are generated:
- unsmoothed histogram mode.
- smoothed histogram mode.
- projected mode. Calculated by extrapolating the lengths of a
series of chords through the peak to zero length and
determining the count value at which this occurs.
- interpolated mode. Calculated by assuming a Normal form
for the histogram peak and 'fitting' a function to it.
The function is then used to provide both a modal value and
the background count standard deviation.
An estimate of the standard deviation of pixel count values
and the background count standard deviation are generated.