RFID readers, RFID tags, software, and methods decode a signal received in an RFID system. The optical waveguide plate forms a first optical medium with a first optical scattering power, into which the light of the light sources is coupled. The interior portion of the flexible member deflects in use in a direction substantially perpendicular to a major longitudinal axis of the shoe. The service processor transmits data communication received from the remote console to the computer through the UART channel, and the service processor transmits data communication received from the computer to the remote console through the UART channel. On subsequent passes, a process of at least one of the screen processing unit, the detection unit, and the correction unit is repeated to convert the input image data to screen-processed image.