The present invention provides a compact scanner apparatus having a tunnel with a conveyor passing therethrough. The airfuel ratio control apparatus for an internal combustion engine includes an ECU, and a LAF sensor and an O2 sensor disposed at locations upstream and downstream of a first catalyst, respectively, in an exhaust pipe. Additionally, during the encoding of residual intra prediction modes, residual intra prediction modes are realigned on the basis of the directionality of valid MPM candidates.