cvConvertScale( dist, dist32s, 1.0, 0.5 );
cvAndS( dist32s, cvScalarAll(255), dist32s, 0 );
cvConvertScale( dist32s, dist8u1, 1, 0 );
cvConvertScale( dist, dist32s, 1.0, 0.5 );
cvAndS( dist32s, cvScalarAll(255), dist32s, 0 );
cvConvertScale( dist32s, dist8u1, 1, 0 );