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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_11_02
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1102066a
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1992-12-12
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/********************************************
*
* smooth_histogram(...
*
* This function smoothes the input histogram
* and returns it. It uses a simple averaging
* scheme where each point in the histogram
* is replaced by the average of itself and
* the two points on either side of it.
*
*********************************************/
smooth_histogram(histogram)
unsigned long histogram[];
{
int i;
unsigned long new_hist[GRAY_LEVELS+1];
zero_histogram(new_hist);
new_hist[0] = (histogram[0] + histogram[1])/2;
new_hist[GRAY_LEVELS] =
(histogram[GRAY_LEVELS] +
histogram[GRAY_LEVELS-1])/2;
for(i=1; i<GRAY_LEVELS; i++){
new_hist[i] = (histogram[i-1] +
histogram[i] +
histogram[i+1])/3;
}
for(i=0; i<=GRAY_LEVELS; i++)
histogram[i] = new_hist[i];
} /* ends smooth_histogram */