CE VAR - Contrast Enhancement - Variance

(10/07/02)

PURPOSE

Creates variance image/volume. May be useful for texture based segmentation. Works on images and volumes.   Example.

SEE ALSO

CE G [Contrast Enhancement - Gradient]
CE HURST [Contrast Enhancement - Hurst]

USAGE

.OPERATION: CE VAR

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

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

.NEIGHBORHOOD X, Y, & Z: 3 3 3
[Length of the neighborhood around a pixel. Must be an odd number.]

NOTES

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

  2. Variance is (1/N-1) * summation (over the neighborhood) of the square of the difference between the pixel's intensity and the average intensity of pixels in the neighborhood. (Where N is the number of pixels in the the neighborhood.)

SUBROUTINES

FILTER

CALLER

UTIL2

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