how many points of polygon

/*rvi program

band3:
http://aitech.ac.jp/~y-yama/data/rvi/band3.raw.zip
band4:
http://aitech.ac.jp/~y-yama/data/rvi/band4.raw.zip
512*512
unsigned char

made by Yoshiyuki Yamamoto
ver1.0 2004/5/30*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int main(int argc,char *argv[])
{
    FILE *fpi1,*fpw,*fpo;
        int i,j,height,width;
    unsigned int dn1,dn2;
    unsigned int sub_dn;
    //float dn3;
    unsigned char line;
    unsigned int *file1;
    //float *file3;
    float start,end;

    start=clock();

    if(argc!=5)
    {
        fprintf(stderr,"Usage: %s\n(1)Input_READ_Binary_filename\n(2)width\n(3)height\n(4)output_filename\n",argv[0]);
        exit(1);
    }

        printf("OPEN R FILE NAME:%s\n",argv[1]);
    //printf("OPEN NIR FILE NAME:\%s\n",argv[2]);
    //printf("OPEN OUTPUT FILE NAME:%s\n",argv[3]);

    width = atoi(argv[2]); printf("W = %d,", width);//1
        height = atoi(argv[3]); printf("H = %d\n", height);
    //header=atoi(argv[6]);printf("header=%d\n",header);

    /*---------ÉÅÉÇÉäÇÃé©ìÆäÑìñ----------*/
        file1= (unsigned int *)malloc(width*height*sizeof(int));
    //file2= (unsigned char *)malloc(width*height*sizeof(char));
    //file3= (float *)malloc(width*height*sizeof(float));

    /*----------------ì¸óÕRâÊëúÉtÉ@ÉCÉãÇÃÉIÅ[ÉvÉìäJén----------------------*/
        if((fpi1=fopen(argv[1],"rb"))==NULL)
    {       /*ÉtÉ@ÉCÉãÇÃÉIÅ[ÉvÉì*/
            fprintf(stderr,"input file open error\n");
        exit(1);
        }

        fread((unsigned int *)file1,sizeof(int),width*height,fpi1);
    /*----------------âÊëúÉtÉ@ÉCÉãÇÃÉIÅ[ÉvÉìèIóπ----------------------*/
    /*----------------ì¸óÕNIRâÊëúÉtÉ@ÉCÉãÇÃÉIÅ[ÉvÉìäJén----------------------*/

    if((fpw=fopen(argv[4],"w"))==NULL)
        {
                fprintf(stderr,"DSM by GSI データファイル.raw\n");
                exit(1);
        }

    for(i=0;i<height-1;i++)
    {
        for(j=0;j<width;j++)
        {
            dn1=file1[i*width+j];
            dn2=file1[(i+1)*width+j];
            sub_dn=dn2-dn1;
            fprintf(fpw,"%d\n",sub_dn);
            //printf("dn1=%d ",dn1);

            //if(j==0 && dn1==1)
            //{
                //printf("line=%d\n",i);
                //fprintf(fpw,"%d\n",i);
            //}
        }
    }

    free(file1);
    //free(file2);
    //free(file3);
    fclose(fpi1);
    fclose(fpw);
    //fclose(fpi2);
    //fclose(fpo);
    end=clock();

    //printf("äJénéûä‘ÇÕÅC%fïb\n",start/1000);
    //printf("èIóπéûä‘ÇÕÅC%fïb\n",end/1000);
    //printf("åoâfléûä‘ÇÕÅC%fïb\n",(end-start)/1000);

}