Adding and detecting bar code printed with ink invisible to human eye onto printed medium

摘要

A bar code is added to a printed medium having one or more images visible to the human eye. The bar code is printed with ink invisible to the human eye. The bar code as printed on the printed medium with ink invisible to the human eye is then detected, such as by a computing device like a mobile phone-type device. Information relating to the images on the printed medium is decoded from the bar code and transmitted to an electronic service. In return, electronically encoded information relating to the images on the printed medium is received from the electronic service and displayed.