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dobule ZO = .0, ZB = .0;
int nB = 0, nO = 0;
BYTE bytVal = 0;
while( 还有图像数据没读完 )
{
bytVal = ReadNextPixel();
if( bytVal > T0 )
{
ZB += bytVal;
++nB;
}
else
{
ZO += bytVal;
++nO;
}
}
ZO /= nO;
ZB /= nB;