Image resolution recognition device, method for recognizing image resolution and image resolution recognition program

A method for recognizing image resolution comprising:

• a starting point setting step of, according to a starting point specification instruction that is input on a scale included in a photographed image of a fingerprint displayed on a display screen, setting a starting point on a pilot wire designated first by the starting point specification instruction from among the pilot wires to display divisions of the scale;
• a passing point setting step of, every time an input line drawn along the scale from the starting point set in the starting point setting step passes a pilot wire, setting a passing point on the passed pilot wire;
• an inter-division distance calculation step of calculating inter-division distance on the image using a position of the starting point and positions of the passing points;
• a standard resolution calculation step of calculating size of standard resolution corresponding to the image using the inter-division distance calculated in the inter-division distance calculation step and unit length that is length of one division of the scale;
• and
• a frame display step of displaying a frame on the image in accordance with the size of the standard resolution calculated in the standard resolution calculation step.

A non-transitory computer readable medium embodying an image resolution recognition program causing a computer to execute:

• a starting point setting step of, according to a starting point specification instruction that is input on a scale included in a photographed image of a fingerprint displayed on a display screen, setting a starting point on a pilot wire designated first by the starting point specification instruction from among the pilot wires to display divisions of the scale;
• a passing point setting step of, every time an input line drawn along the scale from the starting point set in the starting point setting step passes a pilot wire, setting a passing point on the passed pilot wire;
• an inter-division distance calculation step of calculating inter-division distance on the image using a position of the starting point and positions of the passing points;
• a standard resolution calculation step of calculating size of standard resolution corresponding to the image using the inter-division distance calculated in the inter-division distance calculation step and unit length that is length of one division of the scale;
• and
• a frame display step of displaying a frame on the image in accordance with the size of the standard resolution calculated in the standard resolution calculation step.