15.5.132 despike

despike(x [, frac=frac, level=level, niter=niter, spikes=spikes, rms=rms])

This function returns a copy of two-dimensional image x from which (radiation) spikes have been removed.

frac

If the average of the eight nearest neighbor pixels is less than 1 - frac) times the central pixel value, then the pixel is declared to be bad. Defaults to 0.25.

level

An index into a sorted list of data values from neighboring pixels, to replace bad pixels. Only values between 0 and 15 are useful. Defaults to 7.

niter

The number of despike iterations to apply. Defaults to 1 and must not exceed 20.

spikes

If non-zero, then 8x8 cells are zapped if they contain spikes or more spikes. This option is intended for use with images that were restored by jpeg decompression, and requires that the dimensions of x be multiples of 8.

rms

If non-zero, then 8x8 cells are zapped if they show an rms data value variation exceeding rms. This option is intended for use with images that were restored by jpeg decompression, and requires that the dimensions of x be multiples of 8.