function bg(q,w,t,W,H,s) {
	k  = gk(s);
	N  = k.length;
	N2 = F(N/2);
	for (y=0;y<H;++y) for (x=0;x<W;++x) {
		m = 0;
		d = 0;
		for (j=0;j<N;j++) {
		    i = j+x-N2;
		    if (i>=0 && i<W) {
    			m   += k[j]*q[i+W*y];
    			d += k[j];
			}
		}
		t[x+W*y] = m/d;
    }
	for (y=0;y<H;++y) for (x=0;x<W;++x) {
		m = 0;
		d = 0;
		for (j=0;j<N;j++) {
		    i = j+y-N2;
		    if (i>=0 && i<H) {
    			m += k[j]*t[W*i+x];
    			d += k[j];
			}
		}
		w[x+W*y] = m/d;
    }
}

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