An intercooler for an internal combustion engine has a fin-and-tube block including a plurality of flat heat transfer units having internal fluid passages orientated transversely to the direction of air flow, and arranged parallel to one another to define gaps therebetween. Means 14, 16, 18 are provided for the acquisition of the position and alignment of said X-ray emitter in space. To retrieve a value, the position of the corresponding n-bit value is compared to the positions stored in the overflow value to determine the overflow value of the n-bit value. During execution of a functional processing block, a check is performed to determine whether an action is associated with the functional processing block. The first imaging focus lens position decision unit decides the imaging focus lens position according to the focus position information having a focus position closest to an imaging person among the focus lens position information associated with the contrast information showing a contrast value not less than a predetermined threshold value. The interframe difference between the current display frame information and preceding display frame information is detected by the difference detector, and only the interframe difference is transferred to a system bus so that a frame display is presented on non-interlacing display means.