HI E - Histogram - to determine entropy

PURPOSE

Computes entropy of image using a histogram.   Example.

SEE ALSO

HIS	[Histogram - image/volume]

USAGE

.OPERATION: HI E [entropy]

[This operation can return one optional register variable:

Variable	Example	Receives
First	[entropy]	Entropy

.INPUT FILE: PIC027
[Enter the name of the file containing the image/volume.]

.NUMBER OF BINS: 256
[Set number of bins used in histogram.]

.HISTOGRAM RANGE: <CR>
[Enter range for histogram. Default range is the minimum .... maximum of the file.]

NOTES

1. For each grey level (bin) compute the frequency f(i) = number of pixels in bin(i) / total pixels in image. Compute Sum of -f(i)*log(f(i)) The sum is the entropy of the image. The following information will be printed out, there is no plot of the histogram:

   FILE RANGE:	.........
   HIST. RANGE:	.........
   IMAGE PIXELS:	HIST. PIXELS:
   NO. OF BINS:
   ENTROPY:

SUBROUTINES

ENTROP

CALLER

UTIL1