``2D_conn_comp'' - two-dim. connected components analysis

VFX name:

iConnComp2d

IMPROMPTU Equivalent:

2D_conn_comp

purpose:

This function is identical to ``three-d'' except that it works on 2-d x-y (transverse) planes.

input:

An 8-bit binary-valued volume.

output:

An 8-bit volume, possibly with grayscale values.

parameters:

Default parameters menu is

minCompSize = 10
maxNumComp = 1
connectivity = 4
saveLabels = no

The connectivity can be varied between 4-connectivity and 8-connectivity [24].

comments:

1.

This function only works on 2-D transverse planes!

2.

To do a 2-D sagittal (x-z) connect-components analysis, use the function ``three-d'' and set the subregion parameters (REGION submenu of ROI) ``x width = 1'' and ``x low = x<sub>1</sub>'', where x<sub>1</sub> selects the sagittal slice. To do other sagittal slices, you must vary the parameter ``x low = '' and rerun ``three-d''. (Yes, this is cumbersome.) To do a 2-D coronal (y-z) connect-components analysis, use the function ``three-d'' and set the subregion parameters (REGION submenu of ROI) ``y width = 1'' and ``y low = x₁'', where y₁ selects the coronal slice. To do other coronal slices, you must vary the parameter ``y low = '' and rerun ``three-d''.

3.

Only a maximum of 254 components can be saved safely on each slice!