CE FREI - Contrast Enhancement - Frei & Chen

(6/18/01)

PURPOSE

Segmentation of image using a Frei-Chen convolution. Useful for edge detection.   Example.

SEE ALSO

CE HURST [Contrast Enhancement - Hurst]
CE HAR [Contrast Enhancement - Haralick]
CE VAR [Contrast Enhancement - Variance]
CE LAP [Contrast Enhancement - Laplacian]

USAGE

.OPERATION: CE FREI

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

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

NOTES

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

  2. Uses a set of 8 convolution kernals to get a ratio of "edgeness" versus "non-edgeness" for each pixel.

  3. Reference: John C. Russ, "The Image Processing Handbook", CRC Press, Inc. (2000)

  4. Not implemented for volumes. Volumes are processed slice-by-slice.

SUBROUTINES

FILTER

CALLER

UTIL2

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