IM_THRESHOLD

Threshold images stored in a dataset (DIP_Image)

   B = IM_THRESHOLD(A,TYPE,PAR,INV)
   B = A*IM_THRESHOLD([],TYPE,PAR,INV)

Input
A	Dataset with object images (possibly multi-band)
TYPE	Type of procedure, see below
PAR	Related parameter
INV	If INV = 1, result inverted, default INV = 0.

Output
B	Dataset with thresholded images

Description

The following procedures are supported (TYPE)

'isodata':	Thresholding using the Isodata algorithm,  for more options (mask image, several thresholds)  see dip_isodatathreshold. (default)
'triangle':	Thresholding using chord method  (a.k.a. skewed bi-modality, maximum distance to triangle)  by Zack, Rogers and Latt (1973).
'background':	Thresholding using unimodal background-symmetry method.
'fixed':	Thresholding at a fixed value.
'double':	Thresholding between two fixed values.
'volume':	Thresholding to obtain a given volume fraction.
'hysteresis':	From the binary image (in>low) only those regions are  selected for which at least one pixel is (in>high)

The following parameters are related to these procedures (PAR): ('background'): Distance to the peak where we cut-off, in  terms of the half-width at half the maximum.  Inf selects the default value, which is 2.

('fixed'):	Threshold value. Inf means halfway between  minimum and maximum value.
('double'):	Two threshold values. Inf means min+[1/3,2/3]*(max-min).
('volume'):	Parameter = the volume fraction (Inf means 0.5)
('hysteresis'):Two	values: low, high (see above)

 SEE   DATASETS, DATAFILES, DIP_IMAGE, THRESHOLD