void MedianFilter(BYTE huge *Image,unsigned hangbd,unsigned cotbd, unsigned rong,unsigned cao)

{ register unsigned i,j,k,l,pixelindex;

BYTE *pixelvalues;

pixelvalues=(BYTE *)calloc(9,(unsigned)sizeof(BYTE));

if(pixelvalues==NULL)

{Error(16);

getch();exit(0);}

for(i=hangbd;i<cao-1;i++) //maxy

{

for (j=cotbd;j<rong-1;j++) //maxx

{

pixelindex= 0;

for(k=0;k<3;k++)

for(l=0;l<3;l++)

pixelvalues[pixelindex++]=ReadPixel(Image,j+k,i+l);

SortPixel(pixelvalues);//sap xep*/

WritePixel(Image,i,j,pixelvalues[5]);//doc 9 ghi 1

}

} //end of for

free(pixelvalues);