#include "VisXV4.h"    /* VisionX structure include file       */
#include "Vutil.h"     /* VisionX utility header files         */

VXparam_t par[] =      /* command line structure               */
{
{    "if=",    0, " input file  vthresh: threshold images"},
{    "of=",    0, " output file "},
{    "th=",    0, " Threshold value (default 50)"},
{     0,       0,    0}
};
#define  INIMAGE   par[0].val
#define  OUTIMAGE  par[1].val
#define  THRESHOLD par[2].val

int main(int argc, char** argv)
{
Vfstruct (im);
int x, y;
int thresh;

VXparse(&argc, &argv, par);  /* parse the command line         */
 if (THRESHOLD ) {
    thresh = atoi (THRESHOLD); 
 } else {
    thresh = 50;
 }

 while ( Vfread( &im, INIMAGE) ) {
    if ( im.type != VX_PBYTE ) {
           fprintf (stderr, "error: image not byte type\n");
           exit (1);
    }
    for ( y = im.ylo; y <= im.yhi; y++) {
       for ( x = im.xlo; x <= im.xhi; x++) {
          im.u[y][x] = im.u[y][x] >= thresh ? 255 : 0;
       }
    }
    Vfwrite( &im, OUTIMAGE);
  }
exit(0);
}