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karo_threshold

Arguments:

• _method={ triangle | yen | otsu | _otsu | bgt | intermeans | intera | rats | fixnnn | huang | huang2 | li | moments | minerrori | maxentropy | mean | renyientropy | shanbhag | bgt2 },_delclass>0,_smooth>0

Description:

Calculate threshold (methods derived from ImageJ) in range [0,255] using histogram evaluation, evtl. normalization necessary. Methods otsu,_otsu and rats base on image evaluation in contrast to the other methods. For help do 'gmic help otsu' or '... _karo__otsu' or '... rats'. Method fixnnn allows to apply a fixed threshold nnn calling '_karo_fix nnn'. Method intera calls the internal function x_threshold in interactive mode

For each method the user function _karo_'method' is called!
If {_delclass > 0} delete cluster {_delclass-1}.
If {_smooth > 0} blur_x histogram with amplitude _smooth.
No histogram processing for otsu, rats and intera!
No test for existence of method!

Default values:

method=triangle, delclass=smooth=0

Example of use: