ER - Erode object in a binary image/volume

PURPOSE

Erodes object(s) inside a binary input image/volume.   Example.

SEE ALSO

EC CL	[Extract Connected Clusters]
DI	[Dilate (enlarge) object in a binary image/volume]
ER SK	[Erode object a binary image to make its skeleton]
ER EDM	[Create Euclidean Distance Map]
TH F	[Threshold - Set pixels above/below Threshold to Fixed value]

USAGE

.OPERATION: ER

.INPUT FILE: VOL001
[Enter the name of the input file.]

.OUTPUT FILE: VOL002
[Enter name for output file.]

.BOX OR CROSS NEIGHBORHOOD (B/C): C
[Shape of neighborhood. Box is a square/cube centered on each voxel, cross is a 2/3-dimensional cross centered on each voxel.]

.LENGTH OF NEIGHBORHOOD: 3
[Length of the neighborhood around a voxel. Must be an odd number > 1.]

.ERODE IF NUMBER OF OCCUPIED NEIGHBORS IS LESS THAN: 26
[Voxel will be set to 0.0 (eroded) if it has fewer than this many occupied neighbors.]

NOTES

1. Requires a "binary" input image/volume with pixels/voxels having density either zero or one. Various 'TH' operations can be used to create a binary image. Eroded areas are set to value of zero.

2. Image/volume is "circularly closed" so that pixels/voxels on boundaries have a neighbor on opposite boundary.

SUBROUTINES

EROSION

CALLER

UTIL3