Patent ID: 7726570

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, wherein the image includes a graphical indicator that is visually negligible and is affixed on the surface of the page of the book; 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; wherein the graphical indicator comprises a plurality of graphical micro-units arranged in a layout, the layout corresponds to an indicator information, the processing circuitry analyzes the layout of the graphical micro-units to retrieve the indicator information and further to acquire the additional information from the indicator information by processing and/or transforming the graphical indicators, wherein the surface of the page of the book comprises a main information that overlaps and co-exists with the graphical micro-units on the surface of the page of the book, wherein the graphical micro-units are negligible when the user observes the main information, wherein each graphical micro-unit is printed in an ink that substantially absorbs infrared ray, and the main information is printed in an ink that hardly absorbs infrared ray, and the optical device emits infrared ray onto the surface of the page of the book and then receives a response image from the surface of the page of the book as the image, and wherein the ink is a black oil ink, while the main information is printed in a Near-K ink that hardly absorb infrared ray.