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/****************************************************************************/
/* */
/* IMG* Image Processing Tools Library */
/* Program: imgThresh.c */
/* Author: Simon A.J. Winder */
/* Date: Thu Oct 20 20:46:01 1994 */
/* Copyright (C) 1994 Simon A.J. Winder */
/* */
/****************************************************************************/
#include "tools.h"
#define PRGNAME "Thresh"
#define ERROR(e) imgError(e,PRGNAME)
int main(int argc,char **argv)
{
it_image *i1,*i2;
int width,height,x,y;
double val,low_thresh,high_thresh;
it_float *flt_ptr;
IFHELP
{
fprintf(stderr,"img%s - Threshold image\n",PRGNAME);
fprintf(stderr,"img%s [low_thresh [high_thresh]]\n",PRGNAME);
fprintf(stderr," stdin: Float\n");
fprintf(stderr," stdout: pbm\n");
exit(0);
}
imgStart(PRGNAME);
low_thresh=high_thresh=0.0;
if(argc>3)
ERROR("invalid arguments");
if(argc>1)
low_thresh=atof(argv[1]);
if(argc>2)
high_thresh=atof(argv[2]);
do {
i1=i_read_image_file(stdin,IT_FLOAT,IM_FRAGMENT);
if(i1==NULL)
ERROR("can't import image file");
width=i1->width;
height=i1->height;
i2=i_create_image(width,height,IT_BIT,IM_FRAGMENT);
if(i2==NULL)
ERROR("out of memory");
for(y=0;y<height;y++)
{
flt_ptr=im_float_row(i1,y);
for(x=0;x<width;x++)
{
val=1;
if(*flt_ptr>=low_thresh)
{
val=0;
if(argc==3 && *flt_ptr>high_thresh)
val=1;
}
im_put_bit_value(i2,x,y,val);
flt_ptr++;
}
}
i_destroy_image(i1);
i_write_image_file(stdout,i2,IF_BINARY);
i_destroy_image(i2);
} while(!feof(stdin));
imgFinish(PRGNAME);
return(0);
}
/* Version 1.0 (Oct 1994) */
/* Version 1.1 (Nov 1994) */
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