The present invention provides an analysis method that uses error metrics to determine whether an image is suitable for compression. The system is a closed system and includes a sealed container, and an evaporator, housed within the sealed container. A processing object that a process is completed in the first treating unit is received in a magazine so as to be vertically stacked and a plurality of magazines each having one or more processing objects is stored in an input stacker. Thus, the stair climbing vehicle is able to stably climb the stairs.