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imnoneg.c

00001 /*****************************************************************************
00002    Major portions of this software are copyrighted by the Medical College
00003    of Wisconsin, 1994-2000, and are released under the Gnu General Public
00004    License, Version 2.  See the file README.Copyright for details.
00005 ******************************************************************************/
00006    
00007 #include "mrilib.h"
00008 
00009 int main( int argc , char * argv[] )
00010 {
00011    MRI_IMAGE * imin ;
00012    short *     sar ;
00013    int npix , ii ;
00014 
00015    if( argc < 3 || strncmp(argv[1],"-help",4) == 0 ){
00016       printf("Usage: imnoneg input_image output_image\n"
00017              "Zeros out all negative pixel in input_image\n"
00018              "Only works on images of shorts!\n" ) ;
00019       exit(0) ;
00020    }
00021 
00022    machdep() ;
00023 
00024    imin = mri_read(argv[1]) ;
00025    if( imin == NULL || imin->kind != MRI_short ) exit(1) ;
00026    npix = imin->nx * imin->ny ;
00027    sar  = (short *) mri_data_pointer(imin) ;
00028 
00029    for( ii=0 ; ii < npix ; ii++ )
00030       if( sar[ii] < 0 ) sar[ii] = 0 ;
00031 
00032    mri_write(argv[2],imin) ;
00033    exit(0) ;
00034 }

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imnoneg.c