#ifndef THRESHOLD_H #define THRESHOLD_H extern unsigned char *threshold_std(unsigned char *channel, int size, unsigned char th); extern unsigned char *threshold_mean(unsigned char *channel, int size); extern unsigned char *threshold_median(unsigned char *channel, int size); extern unsigned char *threshold_lmean(unsigned char *channel, int width, int height, int half_width); extern unsigned char *threshold_percent(unsigned char *channel, int size, float percent); #endif /* THRESHOLD_H */