matlab/mex/distancetransform.c

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#include "mex.h"
#include "mex_utils.h"

#include <stdlib.h>
#include "array.h"
#include "distances.h"
#include "imageproc.h"


void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]){ 
  char msg[2000];
  const char *docstring = 
     "[ dt ] = distancetransform( binarymatrix );\n"
     " The input array is treated as binary, i.e. if a value is >0, it is\n"
     " assumed to be 1, else it is 0.\n";
  
  /* check proper input and output */
  if(nrhs<1){
    sprintf(msg, ">> Need 1 input.\n%s\n", docstring);
    mexErrMsgTxt(msg);
  } else if(!is_mex_matrix(prhs[0])){
    sprintf(msg, ">> First Input must be a double-precision matrix.\n%s\n", docstring);
    mexErrMsgTxt(msg);
  } 

  /* getting the appropriate array representation */
  Array *binimg = mex_mxarray_to_array( prhs[0] );

  /* computation */
  array_typecast( binimg, INT );
  Array *dt = disttransform_deadreckoning( binimg, NULL );
  plhs[0]=mex_array_to_mxarray( dt ); 

  /* cleaning up */
  array_free( binimg );
  array_free( dt );

  return;
}