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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | /*
* histeq.h - saoimage header file for histogram equalization functions.
* allan: added header, guard, includes, prototypes
*/
#ifndef _histeq_h_
#define _histeq_h_
#include <sys/types.h>
#ifndef lint
static char SccsHistEqId[] = "%W% %G%";
#endif
/* Module: HistEq.h
* Purpose: Define the structs for histogram equalization
* Modified: {0} Michael VanHilst initial version 30 May 1989
* {1} Peter W. Draper converted to use unsigned 20 Jan 1999
* long for scalemap
* {n} <who> -- <does what> -- <when>
*/
#ifndef MAX
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
/* link describes a section of the histogram to have levels allocated */
typedef struct histogramLink {
int low; /* index of lowest histogram entry */
int high; /* index of highest histogram entry */
int range; /* number of histogram entries covered */
int nz_entries; /* number of non-zero histogram entries */
int pixel_area; /* number of image pixels within range */
int max_entry; /* largest area for any single entry */
int excess_pixels; /* pixel area in excess of average */
int color_levels; /* number of color levels allocated */
struct histogramLink *next; /* link list pointer */
int pad;
} SubrangeLink;
/* list describing details of color level allocation for a histogram range */
typedef struct histogramList {
int pixel_area; /* pixel area that is covered by this color level */
int first, last; /* first and last histogram entries cor this color */
int pad;
int shrink_area; /* area covered by omitting last non-zero entry */
int shrink_entry; /* index for last to excude last non-zero entry */
int stretch_area; /* area covered by including next non-zero entry */
int stretch_entry; /* index for last to include next non-zero entry */
} SubrangeList;
/* allan: added prototype */
void histogram_equalize (
unsigned long *scalemap, /* i/o: scalemap (for signed indexing) */
int *histogram, /* i: histogram (for signed indexing) */
int area, /* i: area in pixels when histogram was made */
int pmin, int pmax, /* i: min and max values in histogram */
int color_levels, /* i: number of levels in color map */
unsigned long *pixels); /* i: map to hardware entries */
#endif /* _histeq_h_ */
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