To provide a system wherein a depositor certification image is recorded as an invisible image in a bankbook and made recognizable visually only when it is observed by using a specific judging device, while the certification image recorded in the bankbook is difficult to copy by general-purpose optical equipment.
A method for issuing the bankbook to which the certification image for confirming the depositor is attached comprises a step of inputting the depositor certification image by an input device, a step of converting the certification image into a dot image represented by dots, and a step wherein a first ink having prescribed physical properties for the light other than visible light is allotted to the dot image portion of the certification image, while a second ink different in the physical properties for the light other than the visible light from the first ink is allotted to the dot image portion other than that of the certification image or the dot image portion including the certification image, so as to prepare latent image data, and the data is stored in a storage device. Based on the latent image data prepared, the dot image including the certification image is printed on the bankbook.
NOYAMA HIDEO
TERADA SHUJI
IKEGAMI RYUSUKE
TAKAHASHI YOSHIYASU
