1. A video image compression system configured to: access a sequence of referenceable and predicted frames, each of the referenceable and predicted frames comprising picture regions; and encode at least one picture region of at least one predicted frame by reference to at least two subsequent referenceable frames in the sequence utilizing an unequal weighting of selected picture regions from said at least two subsequent referenceable frames in the sequence, wherein said unequal weighting includes weights greater than one or less than minus one; wherein each of the at least two subsequent referenceable frames in the sequence are subsequent to the at least one predicted frame in display order.