Described herein are embodiments of an expandable display system that have an expanded position for retail display and a collapsed position for efficient shipping. A biochip 10 which is spotted with a plurality of probe biopolymers is accommodated in a container 20 into which a washing solution is supplied from a liquid supplying unit 23. The resistance cylinder provides a force against rear tire revolution and varies the resistance to pedaling. First, a matchblock from a reference frame is decomposed equally into several sub-matchblocks, each of which is searched in parallel over a search area decomposed into sub-blocks by a similar factor so as to determine a preliminary motion vector in the reference picture.