erosion under niosII

hello

I have this code in c of erosion

void erosion(int**IM,int**IMM)

{

IM = new int*[640];

IMM = new int*[640];

for(int k = 0 ; k< 640 ; k++ )

{

IM[k] = new int [480];

IMM[k] = new int [480];

}

unsigned char r,u,ml,mm,mr,d;

int i,j;

for(i=1;i<640-1;i++){

for( j=1;j<480-1;j++)

{

u = IM[i-1][j];

ml = IM[j-1];

mm = im[j];

mr = IM[j+1];

d = im[i+1][j];

/// evaluation

r = (u && d) && (ml && mr && mm);

imm[j] = r*255;

}

}

}

it is good under visual2008 but when i turn it under niosII .I have the image black (false result ),I don't have any error of build or excute .

can you help me to resolue this problem

thanks