To provide an information providing system, its method, program and program recording medium in which an electronic watermark image is used for printed matter, such as tickets or posters.
An electronic watermark image is generated by an electronic watermark image generating means 10 for generating an electronic watermark image by converting information to insert the information into printed matter so as not to be visually discriminated, the electronic watermark image acquired from the electronic watermark image generating means is intensified with an arbitrary strength by an intensification means capable of intensifying the electronic watermark image with the arbitrary strength, the electronic watermark image intensified by the intensification means is inserted, printed matter 30 is printed by a printing means 103, and information is extracted by an information extracting means 20 for converting the electronic watermark image inserted into the printed matter 30 into read information and extracting the information.
TAKAMORI KENICHI
ONISHI YASUKO
AOKI DAISUKE
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
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