ER SK - Erode a binary image to make skeleton

PURPOSE

Erodes object in an input image until a "skeleton" is arrived at. Uses four-fold connectivity inside a cross neighborhood.

SEE ALSO

ER	[Erode a binary image/volume]
DI	[Dilate a binary image/volume]

USAGE

.OPERATION: ER SK

.INPUT FILE: IMG001
[Enter the name of the input file.]

.OUTPUT FILE: IMG002
[Enter name for output file.]

NOTES

1. Requires a "binary" input image with pixels having either zero or one. Eroded areas are set to value of zero.

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

3. Does NOT work on volumes.

SUBROUTINES

SKELETON

CALLER

UTIL3