Patent ID: 8002198

Claim:
An electronic book system comprising: an optical device for capturing an image from a selected zone on a surface of a page of a book by a user, the image including a graphical indicator that has a visually negligible size and is affixed on the surface of the page of the book, the surface of the page of the book comprising a main information that overlaps and co-exists with the graphical micro-units on the surface of the page of the book, the graphical micro-units being negligible when the user observes the main information, each graphical micro-unit being printed in an ink that substantially absorbs infrared ray, the main information being printed in an ink that hardly absorbs infrared ray, and the optical device emitting infrared ray onto the surface of the page of the book and then receiving a response image from the surface of the page of the book as the image; a processing circuitry coupled to the optical device for receiving the image, the processing circuitry retrieving the graphical indicator from the image and acquiring an additional information corresponding to the graphical indicator by processing and/or transforming the graphical indicators; a speech circuitry retrieving the additional information and acquiring an audio information corresponding to the additional information by processing and/or transforming the additional information; and a speaker coupled to the speech circuitry for outputting a sound corresponding to the audio information.