for(i = 0; i < number_of_ferns; i++)
{
 for (j = 0; j < ntfm1; ++j)
 {
    index = __cint( index + int(Memory.readUnsignedByte(img + tst.ind1) < Memory.readUnsignedByte(img + tst.ind2)) )
    index <<= 1
    tst = tst.next
 }
 index = __cint( index + int(Memory.readUnsignedByte(img + tst.ind1) < Memory.readUnsignedByte(img + tst.ind2)) )
 tst = tst.next
 Memory.writeInt(index, idx_ptr);
 idx_ptr = __cint(idx_ptr + 4);
}