This invention has as its object to precisely detect the face of a person from a captured image even in a situation with an insufficient brightness. The blade includes a printed circuit board with a connector for connecting to a chassis backplane including a local bus. A second functional block provides a second address, a second column address strobe signal, and a second readwrite signal associated with a second memory access. A cover body may be configured to provide a covering surface, and may have a side wall extending toward the cylinder head. This disclosure also describes techniques for assembling electronic devices in a component stack to provide enhanced display uniformity and improved reading experience. The lookup table comprises a plurality of columns and rows.