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/* image-proc.h: image processing routines */
#ifndef IMAGE_PROC_H
#define IMAGE_PROC_H
#include "bitmap.h"
#include "exception.h"
/* Threshold for binarizing a monochrome image */
#define GRAY_THRESHOLD 225
/* RGB to grayscale */
#define LUMINANCE(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11 + 0.5)
typedef struct
{
unsigned height, width;
float **weight;
float **d;
} distance_map_type;
/* Allocate and compute a new distance map. */
extern distance_map_type new_distance_map(bitmap_type,
unsigned char target_value, bool padded,
at_exception_type * exp);
/* Free the dynamically-allocated storage associated with a distance map. */
extern void free_distance_map(distance_map_type*);
/* Binarize a grayscale or color image. */
extern void binarize(bitmap_type*);
/* Thin a binary image, replacing the original image with the thinned one. */
extern bitmap_type ip_thin(bitmap_type);
#endif /* not IMAGE_PROC_H */
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