Data recording medium and code reader

摘要

A card records data as an optically readable code. A non-interference area is provided around the code to inhibit presence of only an interference image having an attribute causing an error during reading of the code. The code reader's CPU provides a code detection area to be used when a restoration section detects a code image from an image pickup area as a frame image stored in memory. This code detection area is determined based on an alignment error between the image pickup element and the code, and a specification of the code. The alignment error may result from the bottom of a slit which specifies a positional relationship between the code and the image pickup element to pick up the code.