Image reading device and image reading method

An image reading device which conveys a recording medium on which image frames are recorded, and stops an image frame at a reading position, and reads an image, the image reading device comprising:

• a plurality of detecting sections which are disposed along a transverse direction which is orthogonal to a conveying direction of the recording medium, and which, by detecting densities of the recording medium, detect a plurality of edge candidates of an image frame recorded on the recording medium;
• a comparing section comparing density differences of the plurality of edge candidates detected by the plurality of detecting sections;
• and
• a determining section which, on the basis of results of comparison of the comparing section, determines a position of an image frame on the recording medium by using an edge candidate having a large density difference as a reference.

An image reading method of an image reading device which conveys a recording medium on which image frames are recorded, and stops an image frame at a reading position, and reads an image, the method comprising:

• detecting a plurality of edge candidates of an image frame recorded on the recording medium, by detecting densities of the recording medium by a plurality of detecting sections which are disposed along a transverse direction which is orthogonal to a conveying direction of the recording medium;
• comparing density differences of the plurality of edge candidates detected in the detecting;
• and
• on the basis of results of comparison of the comparing, determining a position of an image frame on the recording medium by using an edge candidate having a large density difference as a reference.