Image reading device, abnormality determination program, and abnormality determination method

A non-transitory computer-readable storage medium storing a program, the program including an abnormality determination program executed in an image reading device, the image reading device having

• a transport section that transports a medium along a transport path,
• a read section that is provided in the transport path and that reads an image of the medium, and
• a control section that processes read data read by the read section and that controls transport of the medium in the transport path, the abnormality determination program comprising:
• setting an abnormality determination region for a leading edge region of a read image of the medium and
• performing an abnormality determination process on the abnormality determination region, wherein
• the abnormality determination process includes
• a first step that involves processing pixels of the read data contained in the abnormality determination region into a state that allows distinction between pixels in an intra-medium region and pixels in an extra-medium region,
• a second step that, after the first step, acquires a maximum distance WL from a center position in a medium width direction, which intersects a medium transport direction, to one edge, and a maximum distance WR from the center position to an other edge, and
• a third step that involves comparing a value R with a predetermined threshold R1, the value R being either a ratio or a difference between the maximum distance WR and the maximum distance WL.

An abnormality determination method in an image reading device,

• the image reading device including
• a transport section that transports a medium along a transport path,
• a read section that is provided in the transport path and that reads an image of the medium, and
• a control section that processes read data read by the read section and that controls transport of the medium in the transport path,
• the abnormality determination method in the image reading device comprising:
• setting an abnormality determination region for a leading edge region of a read image of the medium and
• performing an abnormality determination process on the abnormality determination region, wherein
• the abnormality determination process includes
• processing the pixels of the read data contained in the abnormality determination region into a state that allows distinction between pixels in an intra-medium region and pixels in an extra-medium region,
• after a second step, acquiring a maximum distance WL from a center position in a medium width direction, which intersects a transport direction of the medium, to one edge, and the maximum distance WR from the center position to an other edge, and
• comparing a value R with a predetermined threshold R1, the value R being either a ratio or a difference between the maximum distance WR and the maximum distance WL.