Control device of image reading apparatus, operation method thereof, and image detection system

An operation method of a control device of an image reading apparatus having a photomultiplier that detects light from an image carrier carrying image information, comprising:

• an image receiving step of receiving a pre-image and a main image;
• a region information receiving step of receiving information of a region in the pre-image designated by a user;
• a calculation step of calculating a first voltage value of the photomultiplier at which a density of the region becomes a predetermined density;
• and
• a scanning conditions setting step of setting a plurality of pre-scanning conditions, setting a plurality of main scanning conditions, and setting the first voltage value as one of the plurality of the main scanning conditions.

An image detection system, comprising:

• an image reading apparatus having a photomultiplier that detects light from an image carrier carrying image information;
• a console connected to the image reading apparatus;
• an image receiving unit configured to receive a pre-image and a main image;
• a region information receiving unit configured to receive information of a region in the pre-image designated by a user;
• a calculation unit configured to calculate a first voltage value of the photomultiplier at which a density of the region becomes a predetermined density;
• and
• a scanning conditions setting unit configured to set a plurality of pre-scanning conditions, set a plurality of main scanning conditions, and set the first voltage value as one of the plurality of the main scanning conditions.